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Variant interpretation report

PALB2 c.2945G>T, p.(Gly982Val)

NM_024675.4:c.2945G>T NP_078951.2:p.(Gly982Val) Missense · exon 9 View identifiers
Classification
Uncertain significance

Variant description:

No variant summary was recorded for this case.

Five-step scale from benign to pathogenic. This variant is uncertain. Select a step to read what it means.

Uncertain.The recorded classification is uncertain significance.

In plain language

Gene-level background from the recorded interpretation.

About PALB2

PALB2 encodes a tumor suppressor protein that partners with BRCA2 (and also interacts with BRCA1) to repair double-stranded DNA breaks through the homologous recombination pathway. It acts as a scaffold that stabilizes BRCA2 in the cell nucleus and helps recruit DNA-repair machinery to sites of damage. Inherited mutations in PALB2 increase susceptibility to breast cancer, with smaller associated risks for ovarian, pancreatic, and prostate cancer and melanoma, and inheriting two mutated copies causes Fanconi anemia complementation group N. Rare somatic alterations in PALB2 are also found across various tumor types.

LYFE Sciences is an AI system, and it can make mistakes. Criteria may be applied incorrectly, sources may be misread, and a confident-looking classification can still be wrong. Double-check every criterion and its underlying evidence before relying on any call.
01The reasoning

How it was classified

The recorded framework is ClinGen PALB2 VCEP v1.2. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.

Recorded applied criteria

The applied criteria and their strengths are shown as assessed under the stated framework.

Pathogenic evidence criteria: 1 Benign evidence criteria: 1
Pathogenic criteria applied · 1
PM2Supporting
PM2 · supporting

Met (Supporting): absent from gnomAD v4.1 exomes (AF 0), satisfying the VCEP frequency threshold of <=1/300,000.

Benign criteria applied · 1
BP1Supporting
BP1 · supporting

Met (Supporting): the PALB2 VCEP applies BP1 to all missense variants, including p.(Gly982Val), given the low rate of pathogenic missense changes.

Recorded classification: Uncertain significance

PM2 (Supporting) and BP1 (Supporting) were the only criteria applied; no pathogenic, likely-pathogenic, or benign rule was satisfied, and Rule 31 maps the conflicting pair to VUS (Uncertain Significance - Conflicting Evidence).

02The sources

Evidence at a glance

Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.

No screenshot for this evidence
REVEL score
0.158 recorded score

Recorded REVEL score: 0.158. Refer to the recorded PP3/BP4 rationale for interpretation.

No listed criterion applied
ClinVar submissions
Not recorded

A ClinVar laboratory submission summary was not recorded.

Context only ClinVar ↗
Functional evidence
Statement recorded

OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. PALB2, a scaffolding protein involved in DNA repair, is altered in various cancers.

No listed criterion applied OncoKB ↗
COSMIC
Cancer Hotspots
Somatic evidence
No matching record reported

This variant has not previously been reported in somatic cancers (COSMIC).

Cancer Hotspots

This variant does not lie in a statistically significant hotspot.

For specialists

Technical detail

ACMG/AMP criteria under ClinGen PALB2 VCEP v1.2, with the data and sources behind each one.

28 criteria with recorded statuses: 2 met · 5 not met · 3 not assessed · 18 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.

Met Not met Not assessed Not applicable

All three consequence/LoF criteria resolve to not_applicable for NM_024675.4:c.2945G>T (p.Gly982Val): the variant is a single missense substitution with no null-variant consequence (PVS1), no protein length change or stop-loss (PM4), and no in-frame indel in a repeat region (BP3), per the governing ClinGen HBOC VCEP PALB2 v1.2 specification.

SpliceAI max delta score 0.003 excludes a splice-mediated mechanism, so there is no basis for any LoF-consequence code via splicing.

No paper findings were available (fulltext_map.json and paper_extracts.json are empty; literature_pass found 0 PMIDs); adjudication rests on variant consequence data and the VCEP framework, which are sufficient and conclusive for these criteria.

Governing framework: ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for PALB2 Version 1.2 (cspec, precedence rank 1); generic ACMG/AMP combination rules are not used because an applicable gene-specific VCEP specification exists.

Variant is a missense change p.(Gly982Val) (NM_024675.4:c.2945G>T, exon 9) with no predicted splice impact (SpliceAI max delta score 0.003).

PS1, PM1, PM5 and PP2 are each explicitly not applicable / not for use for missense changes under the PALB2 VCEP v1.2: PS1 is restricted to the PS1 splicing table (missense do not use), PM1 and PP2 are marked Not applicable because missense pathogenicity is unconfirmed in PALB2, and PM5 applies only to truncating/splice variants with PTCs upstream of p.Tyr1183.

BP1 (Benign Supporting) is met: the VCEP rule applies to all PALB2 missense variants, and this variant is missense.

No literature PMIDs (literature_pass total_pmids = 0), no ClinVar entry for the variant, and no full-text paper extracts (paper_extracts.json and fulltext_map.json empty) were available, so all decisions rest on the CSPEC ruleset plus the established variant consequence.

PS2 and PM6 are not applicable under the governing PALB2 HBOP VCEP v1.2, which explicitly disallows both de novo criteria for PALB2 AD and AR disease ('Do not use for AD or AR disease') because informative de novo occurrences have not yet been observed; generic ACMG PS2/PM6 must not be substituted.

PP1 and BS4 are applicable criteria under the VCEP but cannot be scored: the case bundle contains no segregation or non-segregation data whatsoever (no pedigree/meioses/affected-relative genotypes, no LOD or Bayes factor, variant absent from ClinVar, zero literature PMIDs). Both are recorded as not_assessed rather than met or not_met because an absence of data supports neither direction.

If family studies become available, PP1 requires LOD >= 0.3 or LR >= 2:1 (AD) or segregation in affected relatives (AR), and BS4 requires LOD <= -0.32 or LR <= 0.48, per the VCEP quantitative co-segregation rules; no such values can be computed from the current case data.

PS3 and BS3 are both declared 'Not Applicable' by the governing ClinGen HBOPC PALB2 VCEP v1.2 specification, so neither functional criterion is applied in this framework and neither contributes to the classification.

Consistent with the framework exclusion, no variant-specific functional assay evidence for p.(Gly982Val) exists anywhere in the case bundle (0 PMIDs, empty paper_extracts/fulltext_map, OncoKB 'Unknown Oncogenic Effect'), so no functional criterion could be met even if generic ACMG/AMP were consulted.

Governing framework: ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Expert Panel Specifications to the ACMG/AMP Variant Interpretation Guidelines for PALB2 Version 1.2 (cspec, framework_mode=vcep, precedence_rank 1); generic ACMG/AMP rules were not used because an applicable gene-specific specification exists.

PS4 (case-control enrichment) is applicable per CSPEC v1.2 but is not met: no case-control or cohort study for c.2945G>T (p.Gly982Val) was identified (literature pass total_pmids=0; fulltext_map and paper_extracts empty), and the variant is absent from ClinVar, leaving no enrichment statistics to evaluate.

PP4, PP5, BP5, and BP6 are all declared Not Applicable by CSPEC PALB2 v1.2; in addition, PP5/BP6 cannot be triggered because the variant has no ClinVar record at all and therefore no exact-variant expert-panel classification exists.

No phenotype-specificity, prevalence, or case-control literature was available for this variant; no publications were reviewed by this group.

Governing framework is the ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Expert Panel (HBOPC) PALB2 VCEP specification v1.2 (cspec, precedence rank 1), which supersedes generic ACMG/AMP for PALB2.

PM3 (recessive/allelic) is not assessable: the PALB2 VCEP scores PM3 by the Fanconi anemia points table (>=1 point per affected proband with the variant in trans), and the case bundle contains no proband, family, segregation, or phase data — the variant is absent from ClinVar and all literature (0 PMIDs, empty paper_extracts/fulltext_map). Status: not_assessed; needs_human_review because proband/pedigree context from the ordering clinician is required.

BP2 is not applicable per the PALB2 VCEP v1.2 specification, so no allelic cis/trans benign evidence is scored in this framework.

No allelic evidence (PM3/BP2) contributes to the classification; the group makes no pathogenic or benign assertion.

PP3 (splice path) was evaluated for this missense variant because the PALB2 VCEP v1.2 splice rule explicitly includes missense/in-frame variants; SpliceAI max delta 0.003 is far below the >=0.2 threshold, so PP3 is not met.

BP4 is not applicable: the PALB2 VCEP v1.2 explicitly states 'Do not apply for missense variants' for BP4 on both the missense-predictor and splice sub-paths, and c.2945G>T is missense.

BP7 is not applicable: the variant is missense, not synonymous or deep intronic, and no RNA data exist to invoke the BP7(RNA) sub-rules.

No calibrated computational evidence criterion (PP3/BP4/BP7) contributes to this variant under the governing PALB2 VCEP v1.2 framework.

Governing framework: ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Expert Panel PALB2 v1.2 CSPEC (cspec; version 1.2, doc 1526222356). All four population criteria were adjudicated against its gnomAD v4-based thresholds.

The variant NM_024675.4:c.2945G>T (p.(Gly982Val)) is absent from gnomAD v4.1 exomes, gnomAD v2.1 exomes, and gnomAD-Canada v1.0 genomes, and is absent from ClinVar. With AF = 0, neither BA1 (>0.1%) nor BS1 (>0.01%) is met; BS2 has no observations to score; PM2 (<=0.000333%) is met at Supporting strength.

No literature PMIDs were identified for this variant (literature_pass total_pmids: 0; paper_extracts.json and fulltext_map.json empty), so no publications were reviewed for the population group.

Met · 2

PM2 SupportingMet (Supporting): absent from gnomAD v4.1 exomes (AF 0), satisfying the VCEP frequency threshold of <=1/300,000. Details ▾Hide ▴
Reasoning

Per the ClinGen HBOP PALB2 v1.2 CSPEC, PM2 is met when the frequency is <=1/300,000 (0.000333%) in the gnomAD v4 dataset; the strength encoded in the CSPEC rule is Supporting (the combination framework likewise references PM2_Supporting). The variant is absent from gnomAD v4.1 exomes (observed AF = 0), which satisfies the <=0.000333% threshold, and absence is corroborated in gnomAD v2.1 exomes and gnomAD-Canada v1.0 genomes. PM2 is met at Supporting strength.

Rule
Frequency <=1/300,000 (0.000333%) in gnomAD v4 dataset
Evidence considered
  • ClinGen HBOP PALB2 v1.2 CSPEC (cspec, version 1.2) rule: PM2 = Frequency <=1/300,000 (0.000333%) in gnomAD v4 dataset, strength Supporting.
  • gnomAD v4.1 exome query for chr16-23623020-C-A (GRCh38) returned search_status 'absent' (found: false); an observed frequency of 0 is <= the 0.000333% (1/300,000) PM2 threshold.
  • Corroborating absence from gnomAD v2.1 exomes (16-23634341-C-A, GRCh37) and gnomAD-Canada v1.0 genomes strengthens the rarity assertion for PM2.
Still missing
  • Raw gnomAD v4 allele counts are not embedded in the evidence bundle (source_data empty); the absence determination (AF = 0) rests on the pipeline query status 'absent' and screenshots rather than on embedded allele-count figures.
Sources
BP1 SupportingMet (Supporting): the PALB2 VCEP applies BP1 to all missense variants, including p.(Gly982Val), given the low rate of pathogenic missense changes. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOC VCEP PALB2 v1.2 CSPEC defines BP1 as applicable to all missense variants in PALB2 at Supporting strength: 'Based on published and unpublished functional studies, PALB2 has a low rate of missense variants that are non-functional in relevant assays... Given the very low likelihood that missense variants are pathogenic, this rule applies to all missense variants in PALB2.' NM_024675.4:c.2945G>T is a single-nucleotide substitution predicted to produce p.(Gly982Val) (NP_078951.2), a missense change in exon 9. BP1 (Benign Supporting) is therefore met.

Rule
Apply to all missense variants.
Evidence considered
  • ClinGen HBOC VCEP PALB2 v1.2 (cspec) BP1 instructions: 'Based on published and unpublished functional studies, PALB2 has a low rate of missense variants that are non-functional in relevant assays. True missense pathogenic variants are not yet confirmed or refuted but are thought to be exceedingly rare. Given the very low likelihood that missense variants are pathogenic, this rule applies to all missense variants in PALB2.'
  • Variant consequence (prefetch normalization): NM_024675.4:c.2945G>T is a substitution predicted to produce p.(Gly982Val) (NP_078951.2), i.e., a missense change in exon 9; VCEP BP1 Supporting rule: 'Apply to all missense variants.'
Sources

Not met · 5 · evaluated, threshold not reached

PS4 Not met: PS4 requires a case-control study (p <= 0.05, OR >= 3), and no case-control or enrichment data exist for this variant. Details ▾Hide ▴
Reasoning

PS4 is applicable under the governing ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer (HBOPC) Expert Panel specification for PALB2 v1.2 (cspec, framework_mode=vcep, precedence_rank 1), which requires a case-control study with p-value <= 0.05 AND (odds ratio, hazard ratio, or relative risk >= 3 OR lower 95% CI >= 1.5). No such evidence exists for this variant: the literature pass identified 0 PMIDs across all evidence sources (literature_pass.json total_pmids=0), fulltext_map.json and paper_extracts.json are empty, no publications were fetched, and the variant is absent from ClinVar, so no case counts or cohort observations for c.2945G>T (p.Gly982Val) are available. Absence of any case-control or enrichment data means PS4 cannot be met.

Rule
Case-control studies; p-value <=.05 AND (Odds ratio, hazard ratio, or relative risk >=3 OR lower 95% CI >=1.5) - ClinGen HBOPC VCEP PALB2 v1.2 (cspec)
Evidence considered
  • ClinGen HBOPC VCEP PALB2 v1.2 (cspec) PS4 rule: 'Case-control studies; p-value <=.05 AND (Odds ratio, hazard ratio, or relative risk >=3 OR lower 95% CI >=1.5)', default strength Pathogenic Strong; PS4 is applicable in this specification.
  • literature_pass.json reports total_pmids = 0 with note 'No PMIDs found across evidence sources'; criteria_index and criterion_screened are empty, so no case-control study or prevalence data for c.2945G>T was retrieved for evaluation.
  • evidence.json ClinVar lookup: 'This variant is absent from ClinVar' (search_status no_result, no variation ID, no submissions), so no aggregated case observations could be drawn from ClinVar.
  • OncoKB reports no variant-specific reviewed evidence for PALB2 p.G982V (classification 'Unknown Oncogenic Effect'); COSMIC has no entry for this variant (somatic only and not applicable to germline case-control PS4 in any event).
Still missing
  • No case-control or cohort study reporting c.2945G>T (p.Gly982Val) was identified (literature pass returned 0 PMIDs); variant-level enrichment statistics (p-value, OR/HR/RR, 95% CI) are unavailable and would be required to evaluate the CSPEC PS4 threshold.
Sources
PP3 Not met: splice-based PP3 requires SpliceAI >= 0.2, and the max delta is 0.003; the VCEP prohibits missense predictors. Details ▾Hide ▴
Reasoning

The governing ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer (HBOPC) Expert Panel Specification for PALB2 version 1.2 (cspec doc 1526222356) makes PP3 applicable but restricts its use: missense in-silico predictors must not be used ('Missense: Do not use' - published predictors have yet to achieve functional outcome for PALB2 missense variants), while splice-based PP3 (SpliceAI >=0.2) explicitly applies to silent, missense/in-frame, and intronic variants outside donor/acceptor 1,2 sites. c.2945G>T is a missense variant (p.(Gly982Val)) located in exon 9 (c.2835-2996), so the splice sub-path applies. SpliceAI returns max delta = 0.003 (DS_AG 0.002, DS_AL 0.001, DS_DG 0.003, DS_DL 0.0), far below the VCEP PP3 threshold of >=0.2, so no splice impact is predicted and PP3 is not met. REVEL (0.158) and BayesDel (-0.366285) were not applied as PP3 evidence: the VCEP prohibits missense predictors for PP3, and BayesDel has no verified published threshold for PP3/BP4.

Evidence considered
  • PALB2 VCEP v1.2 PP3 rule: 'Missense: Do not use. Splicing: Predicted impact via splicing (SpliceAI >=0.2) for silent, missense/in-frame and for intronic variants outside of donor and acceptor 1,2 sites.' The splice sub-path is explicitly applicable to missense/in-frame variants (cspec doc 1526222356)
  • SpliceAI lookup for NM_024675.4:c.2945G>T returns max delta = 0.003 (DS_AG 0.002, DS_AL 0.001, DS_DG 0.003, DS_DL 0.0), below the VCEP PP3 threshold of >=0.2, indicating no predicted splice impact
  • VariantValidator/prefetch places c.2945G>T in exon 9 of NM_024675.4 (c.2835-2996), ~110 nt from the exon 9 acceptor and ~51 nt from the exon 9 donor, i.e., not within canonical donor/acceptor 1,2 positions
  • REVEL score 0.158 was consulted but not applied: the VCEP instructs 'Missense: Do not use' for PP3 because published predictors have yet to achieve functional outcome for PALB2 missense variants
  • BayesDel score -0.366285 was consulted but not applied: no verified published threshold for PP3/BP4 is available to this pipeline, so the score is treated as insufficiently calibrated
Still missing
  • No RNA functional studies (e.g., patient RNA or minigene assays) are present in the case bundle; the splice-impact determination rests on SpliceAI alone as specified by the VCEP
Sources
BA1 Not met: BA1 requires gnomAD filtering AF > 0.1%, and the variant is absent (AF 0). Details ▾Hide ▴
Reasoning

Governing framework is the ClinGen HBOP (Hereditary Breast, Ovarian and Pancreatic Cancer EP) PALB2 v1.2 CSPEC, which defines BA1 as Grpmax Filtering AF >0.1% in the gnomAD v4 dataset (Stand Alone). The variant (chr16-23623020-C-A, GRCh38; NC_000016.9:g.23634341C>A, GRCh37) is absent from gnomAD v4.1 exomes (search_status 'absent'; zero observed alleles, Grpmax filtering AF = 0) and is also absent from gnomAD v2.1 exomes and gnomAD-Canada v1.0 genomes. An AF of 0 does not exceed the 0.1% threshold, so BA1 is not met.

Rule
Grpmax Filtering AF >0.1% in gnomAD v4 dataset
Evidence considered
  • ClinGen HBOP PALB2 v1.2 CSPEC (cspec, version 1.2) rule: BA1 = Grpmax Filtering AF >0.1% in gnomAD v4 dataset, strength Stand Alone.
  • gnomAD v4.1 exome query for chr16-23623020-C-A (GRCh38, dataset gnomad_r4) returned search_status 'absent' (found: false); with no observed alleles the Grpmax filtering AF is 0, well below the 0.1% BA1 threshold.
  • Corroborating absence from gnomAD v2.1 exomes (16-23634341-C-A, GRCh37, dataset gnomad_r2_1) and gnomAD-Canada v1.0 genomes (HostSeq).
Still missing
  • Raw gnomAD allele counts/coverage are not embedded in the evidence bundle (source_data empty for all gnomAD queries); absence is reported via pipeline query status 'absent' plus screenshots.
Sources
BS1 Not met: BS1 requires gnomAD filtering AF > 0.01%, and the variant is absent (AF 0). Details ▾Hide ▴
Reasoning

Per the ClinGen HBOP PALB2 v1.2 CSPEC, BS1 requires Grpmax Filtering AF >0.01% in the gnomAD v4 dataset (Benign Strong). The variant is absent from gnomAD v4.1 exomes (AF = 0), and also absent from gnomAD v2.1 exomes and gnomAD-Canada v1.0. An AF of 0 does not exceed the 0.01% threshold, so BS1 is not met.

Rule
Grpmax Filtering AF >0.01% in gnomAD v4 dataset
Evidence considered
  • ClinGen HBOP PALB2 v1.2 CSPEC (cspec, version 1.2) rule: BS1 = Grpmax Filtering AF >0.01% in gnomAD v4 dataset, strength Benign Strong.
  • gnomAD v4.1 exome query for chr16-23623020-C-A (GRCh38) returned search_status 'absent' (found: false); Grpmax filtering AF = 0, below the 0.01% BS1 threshold.
  • Corroborating absence from gnomAD v2.1 exomes (16-23634341-C-A, GRCh37) and gnomAD-Canada v1.0 genomes.
Still missing
  • Raw gnomAD allele counts/coverage are not embedded in the evidence bundle (source_data empty for all gnomAD queries); absence is reported via pipeline query status 'absent' plus screenshots.
Sources
BS2 Not met: no observations of this variant in individuals inconsistent with the expected phenotype exist; it is absent from gnomAD and ClinVar. Details ▾Hide ▴
Reasoning

Per the ClinGen HBOP PALB2 v1.2 CSPEC, BS2 is scored with the Fanconi Anemia BS2 point tables (>=4 points = Benign Strong, 2 points = Moderate, 1 point = Supporting) for observations of the variant in individuals/homozygotes inconsistent with the expected disease phenotype. No such observations exist for this variant: it is absent from gnomAD v4.1, gnomAD v2.1, and gnomAD-Canada v1.0 (no homozygotes or hemizygotes observed), absent from ClinVar, and no case reports or literature entries were identified (literature_pass total_pmids: 0). With zero scorable probands, BS2 is not met.

Rule
BS2 >=4 points (Strong); BS2_Moderate = 2 points; BS2_Supporting = 1 point (Fanconi Anemia BS2 tables)
Evidence considered
  • ClinGen HBOP PALB2 v1.2 CSPEC (cspec, version 1.2) rule: BS2 >=4 points (Strong), BS2_Moderate = 2 points, BS2_Supporting = 1 point, using the Fanconi Anemia BS2 tables for points per proband.
  • No observations of the variant exist to score: gnomAD v4.1, gnomAD v2.1, and gnomAD-Canada v1.0 all report the variant as absent (no homozygotes possible), and ClinVar has no entry (evidence_sentence: 'This variant is absent from ClinVar.').
  • No literature PMIDs were identified for this variant (literature_pass total_pmids: 0), so no clinical case observations can be scored for BS2.
Still missing
  • No population or clinical observations of this variant are available to score against the Fanconi Anemia BS2 point tables (no homozygotes, no healthy-carrier or affected-individual observations reported in any consulted source).
Sources

Not assessed · 3 · no assessment recorded

PM3 Not assessed: no proband, family, or phase data were available to determine whether the variant occurs in trans with a pathogenic PALB2 allele. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOPC PALB2 VCEP specification v1.2 (cspec) defines PM3 via the Fanconi anemia points table: 1 point per proband = PM3_Supporting, 2 points = PM3, >=4 points = PM3_Strong, >=8 points = PM3_VeryStrong, with points assigned for affected probands carrying the variant in trans with a pathogenic/likely pathogenic PALB2 allele. This case bundle contains no proband-level, family, segregation, or phase (trans/cis) data of any kind: the variant is absent from ClinVar (no submissions), the literature pass returned 0 PMIDs, and paper_extracts.json and fulltext_map.json are both empty. No point can be assigned from any proband observation, so PM3 cannot be met or refuted on the available evidence. Assessment requires the ordering context (proband phenotype compatible with biallelic PALB2 disease such as Fanconi anemia complementation group N, or the AD cancer-predisposition context in which PM3 is not the applicable allelic test), plus at least one affected proband with a confirmed second PALB2 variant in trans.

Rule
PM3 = 2 points (Moderate); PM3_Supporting = 1 point; PM3_Strong >= 4 points; PM3_VeryStrong >= 8 points; see Fanconi Anemia PM3 tables for approach to assign points per proband (PALB2 VCEP v1.2)
Evidence considered
  • PALB2 VCEP (ClinGen HBOPC, cspec doc 1526222356, version 1.2) specifies PM3 with the Fanconi anemia points table: PM3_Supporting = 1 point, PM3 = 2 points, PM3_Strong = >=4 points, PM3_VeryStrong = >=8 points, points assigned per affected proband; release notes v1.2 state the panel clarified when to assume in trans for PM3
  • ClinVar search for PALB2 c.2945G>T returned no result: the variant is absent from ClinVar with no submissions, hence no proband observations or phase data from that source
  • literature_pass.json reports 0 PMIDs across all evidence sources, and paper_extracts.json / fulltext_map.json are empty, so no published proband, biallelic, or phase observations exist for this variant
  • No proband, family, segregation, or trans/cis phase data appear anywhere in the case-evidence bundle, so zero points can be assigned under the VCEP PM3 table
Still missing
  • No proband observations for c.2945G>T (absent from ClinVar, no literature reports)
  • No phase information: no evidence of the variant in trans or cis with any second PALB2 variant
  • No family/segregation data and no biallelic (compound heterozygous or homozygous) cases reported for this variant
  • No information on the proband phenotype or inheritance mode context in which this variant was found
Sources
PP1 Not assessed: no family or segregation data were available to compute the required LOD >= 0.3 or Bayes factor >= 2:1. Details ▾Hide ▴
Reasoning

PP1 is applicable under the PALB2 VCEP (default Pathogenic Supporting) and requires quantitative co-segregation analysis: AD condition LOD >= 0.3 or Bayes factor (LR) >= 2:1 for supporting (>= 0.60 / >= 4:1 moderate; >= 1.26 / >= 18:1 strong); AR condition segregation in 1 (supporting), 2 (moderate), or >= 3 (strong) affected relatives. The case bundle contains no segregation data of any kind: no proband/family pedigree, no meioses in affected relatives, no LOD or LR value, no affected-relative genotypes. The variant is absent from ClinVar (no externally reported co-segregation), and the literature pass returned zero PMIDs (paper_extracts.json and fulltext_map.json empty). With no family data, no LOD/LR can be computed, so PP1 cannot be met or refuted; it is recorded as not_assessed pending segregation studies.

Rule
VCEP PP1: AD - LOD >= 0.3 or Bayes Factor (LR) >= 2:1 (Supporting); LOD >= 0.60 or LR >= 4:1 (Moderate); LOD >= 1.26 or LR >= 18:1 (Strong). AR - segregation in 1 / 2 / >= 3 affected relatives (Supporting / Moderate / Strong). Quantitative co-segregation analysis mandated.
Evidence considered
  • The PALB2 VCEP (cspec) specifies PP1 as applicable with AD thresholds: PP1_Strong LOD >= 1.26 or LR >= 18:1; PP1_Moderate LOD >= 0.60 or LR >= 4:1; PP1 (Supporting) LOD >= 0.3 or LR >= 2:1; AR condition: segregation in >= 3 affected relatives (strong), 2 (moderate), or 1 (supporting).
  • The VCEP mandates quantitative co-segregation analysis for PALB2 alterations, preferably with a method accommodating breast, ovarian and pancreatic cancer phenotypes (e.g., COOL tool computing LR by full-likelihood Bayes).
  • No proband or family segregation information is present in the case bundle: there is no pedigree, no meiosis count, no affected-relative carrier/non-carrier data, and no LOD/LR value to evaluate against the PP1 thresholds.
  • ClinVar (source_registry key clinvar) contains no entry for this variant ('This variant is absent from ClinVar'), so no externally reported co-segregation observations are available.
  • literature_pass.json found no PMIDs across all evidence sources, and paper_extracts.json / fulltext_map.json are empty, so no published segregation data could be reviewed.
Still missing
  • No pedigree or family segregation data (meioses in affected relatives with variant genotype status) is available for this variant.
  • No LOD score or Bayes factor (LR) from quantitative co-segregation analysis (e.g., COOL full-likelihood Bayes) has been computed.
  • No published or ClinVar-reported co-segregation observations exist to consult (variant absent from ClinVar; literature pass found 0 PMIDs).
Sources
BS4 Not assessed: no non-segregation data were available to compute the required LOD <= -0.32 or LR <= 0.48. Details ▾Hide ▴
Reasoning

BS4 is applicable under the PALB2 VCEP (default Benign Strong) and requires quantitative co-segregation analysis demonstrating lack of segregation: LOD <= -0.32 or LR <= 0.48 (supporting), <= -0.64 or <= 0.23 (moderate), <= -1.28 or <= 0.053:1 (strong). The case bundle contains no non-segregation evidence: no affected relatives tested negative for the variant, no pedigree, no LOD/LR computation. Absence of segregation data must not be equated with evidence of non-segregation, so BS4 cannot be met; it is recorded as not_assessed pending family studies showing lack of co-segregation.

Rule
VCEP BS4: LOD <= -0.32 or Bayes Factor (LR) <= 0.48 (Supporting); LOD <= -0.64 or LR <= 0.23 (Moderate); LOD <= -1.28 or LR <= 0.053:1 (Strong). Quantitative co-segregation analysis mandated.
Evidence considered
  • The PALB2 VCEP (cspec) specifies BS4 as applicable with thresholds: BS4 (Strong) LOD <= -1.28 or LR <= 0.053:1; BS4_Moderate LOD <= -0.64 or LR <= 0.23; BS4_Supporting LOD <= -0.32 or LR <= 0.48, computed by quantitative co-segregation analysis.
  • No non-segregation evidence is present in the case bundle: there is no pedigree, no affected relative observed without the variant, and no LOD/LR value that could satisfy any BS4 threshold.
  • ClinVar (source_registry key clinvar) has no entry for this variant, so no externally reported lack-of-segregation observations are available.
  • literature_pass.json found no PMIDs and paper_extracts.json / fulltext_map.json are empty, so no published non-segregation data could be reviewed.
  • Per ACMG/AMP principles (and the VCEP originalACMGSummary), lack of segregation among affected members must be observed to apply BS4; absence of data is not scored against the variant.
Still missing
  • No pedigree or non-segregation data (affected family members tested and not carrying the variant) is available.
  • No LOD score or Bayes factor (LR) from quantitative co-segregation analysis demonstrating lack of segregation has been computed.
  • No ClinVar or published reports of non-segregation exist to consult (variant absent from ClinVar; literature pass found 0 PMIDs).
Sources
Not applicable · 18· recorded as not applicable Show reasons ▾Hide reasons ▴
PVS1 N/ANot applicable: this is a missense substitution (p.(Gly982Val)) with no predicted splice effect (SpliceAI max delta 0.003), so no null-variant consequence exists. Details ▾Hide ▴
Reasoning

NM_024675.4:c.2945G>T is a single-nucleotide substitution in exon 9 of the MANE Select transcript NM_024675.4 predicted to produce the missense change p.(Gly982Val) (NP_078951.2). PVS1 applies only to null variants (nonsense, frameshift, canonical +/-1,2 splice sites, initiation codon, single/multi-exon deletion) per the PALB2 HBOC VCEP v1.2 PVS1 Decision Tree and the SVI PVS1 framework; a missense substitution is not a null-variant consequence and cannot enter the decision tree. SpliceAI reports a max delta score of 0.003, so there is no predicted splice-mediated loss of function. The variant creates no premature termination codon, so NMD is not engaged, and no protein truncation or length change occurs. PVS1 is therefore not applicable for this variant (equivalent to not met).

Rule
Use PALB2 PVS1 Decision Tree (ClinGen HBOC VCEP PALB2 v1.2); the generic SVI null-variant definition covers nonsense, frameshift, canonical +/-1,2 splice, initiation codon, and single/multi-exon deletions only.
Evidence considered
  • Variant consequence: NM_024675.4:c.2945G>T is a missense substitution p.(Gly982Val) in PALB2 exon 9 (VariantValidator, MANE Select transcript NM_024675.4; protein NP_078951.2).
  • pvs1_variant_assessment records consequence_class 'missense', canonical_splice_consensus false, variant_bucket 'other', and states the variant does not fall into the generic PVS1 null-variant buckets (nonsense, frameshift, canonical +/-1,2 splice).
  • PALB2 HBOC VCEP v1.2 (cspec) makes PVS1 applicable only through the PALB2 PVS1 Decision Tree, whose scope is presumed loss-of-function/null and splice variants; a missense substitution is outside that scope.
  • pvs1_gene_context confirms germline loss of function is an established disease mechanism for PALB2 (PVS1 gene gate eligible), which is a necessary background condition but does not make a missense variant a null variant.
  • SpliceAI max delta score 0.003 (DS_AG 0.002, DS_DG 0.003) indicates no predicted splice impact, excluding splice-mediated loss of function.
  • The SVI PVS1 framework (pvs1_generic_framework, PMC6185798; Abou Tayoun et al. 2018, PMID 30192042) defines PVS1 for null-variant consequence types; no such consequence is present here.
Sources
cspec ↗pvs1_variant_assessmentpvs1_gene_contextpvs1_generic_framework ↗spliceai ↗
PS1 N/ANot applicable: the PALB2 VCEP restricts PS1 to splicing variants, and this missense change (p.(Gly982Val), SpliceAI max delta 0.003) triggers no splicing scenario. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOC VCEP PALB2 v1.2 CSPEC marks PS1 as applicable only to splicing variants via the PALB2 PS1 splicing table and explicitly directs 'Missense: Do not use. Missense changes are not yet confirmed as a mechanism of disease for PALB2.' NM_024675.4:c.2945G>T is a missense change (p.(Gly982Val), exon 9) with no predicted splice impact (SpliceAI max delta score 0.003), so no PS1 splicing-table scenario is triggered. Independently, no previously established pathogenic variant producing the same amino acid change (p.Gly982Val) exists in the collected sources (ClinVar: variant absent; literature_pass identified no PMIDs). PS1 is therefore not applicable to this variant.

Rule
Missense: Do not use. Missense changes are not yet confirmed as a mechanism of disease for PALB2. Splicing: See PALB2 PS1 Table (PMID: 37352859).
Evidence considered
  • ClinGen HBOC VCEP PALB2 v1.2 (cspec) PS1 instructions: 'Missense: Do not use. Missense changes are not yet confirmed as a mechanism of disease for PALB2. Splicing: See PALB2 PS1 Table (PMID: 37352859)'; PS1 strength rules (Strong/Moderate/Supporting) all reference the PALB2 PS1 splicing table.
  • SpliceAI lookup for NM_024675.4:c.2945G>T reports max delta score 0.003 (DS_AG 0.002, DS_DG 0.003), i.e., no significant predicted splice impact, so no PS1 splicing-table scenario is triggered.
  • ClinVar search for PALB2 c.2945G>T returned no result (variant absent from ClinVar); literature_pass.json reports total_pmids = 0, so no previously established pathogenic variant at this residue is available in this case.
Still missing
  • No established pathogenic variant producing the same amino acid change p.Gly982Val (e.g., a different nucleotide change at codon 982) is recorded in any collected source; the PALB2 PS1 splicing table itself (PMID 37352859) was not available for review, though it only governs splicing variants.
Sources
PS2 VCEPNot applicable: the PALB2 VCEP disallows PS2 for both AD and AR disease, and no de novo or parental-testing data exist. Details ▾Hide ▴
Reasoning

The governing framework (ClinGen HBOP Expert Panel PALB2 specification v1.2, cspec doc 1526222356) explicitly marks PS2 as Not applicable for both AD and AR disease: informative de novo occurrences have not yet been observed for PALB2-related autosomal dominant cancer predisposition, and breast cancer occurs frequently as an apparently sporadic event so de novo is unlikely to ever be informative unless specific features of PALB2-related cancer predisposition are identified; for AR disease, de novo occurrences are too rare to be informative and confirmed trans phase via parental testing is impractical. No proband or parental-testing data is present in this case in any event, and no external reports exist (variant absent from ClinVar; no literature PMIDs). Per the VCEP instruction 'Do not use for AD or AR disease', PS2 is not applied.

VCEP rule
VCEP: Not applicable - 'Do not use for AD or AR disease: Informative de novo occurrences have not yet been observed'
Evidence considered
  • Governing framework is the ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer (HBOP) Expert Panel specification for PALB2 version 1.2 (source_registry key cspec), which takes precedence over generic ACMG/AMP for this gene.
  • The PALB2 VCEP marks PS2 as Not applicable with the instruction: 'Do not use for AD or AR disease: Informative de novo occurrences have not yet been observed for autosomal dominant disease. As breast cancer is relatively common and occurs frequently as an apparently sporadic event, de novo is unlikely to ever be informative unless specific features of PALB2-related cancer predisposition are identified.'
  • Consistent with the VCEP applicability ruling, PS2 is not applied to this variant even though no de novo or parental-testing observations exist in the case.
  • The case bundle contains no proband phenotype, parental-testing, or family-history section, so there is no de novo observation to evaluate; this is moot given the VCEP not-applicable ruling.
Sources
PS3 VCEPNot applicable: the PALB2 VCEP defines no PS3 rule, and no functional studies of p.(Gly982Val) are available. Details ▾Hide ▴
Reasoning

The governing ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer (HBOPC) Expert Panel Specification for PALB2 version 1.2 (cspec doc 1526222356) explicitly declares PS3 'Not Applicable' and defines no PS3 rule, so PS3 is not used in this framework and cannot contribute evidence here. Independently, even under the generic ACMG/AMP framework PS3 would require well-established functional studies demonstrating a deleterious effect for this exact variant; no such data exist in this case bundle: the literature pass returned 0 PMIDs, paper_extracts.json and fulltext_map.json are empty, and OncoKB reports no variant-specific reviewed functional evidence for PALB2 G982V (Unknown Oncogenic Effect, gene-level context only). In silico predictors (SpliceAI max delta 0.003; REVEL 0.158) are not functional assays and were not used as PS3 evidence.

Evidence considered
  • ClinGen HBOPC PALB2 VCEP v1.2 lists PS3 applicability as 'Not Applicable'; no PS3 rule is defined in the governing specification
  • OncoKB reports 'Unknown Oncogenic Effect' and states it did not identify variant-specific reviewed functional evidence for PALB2 G982V; only gene-level context (PALB2 scaffolding protein involved in DNA repair) is provided
  • The case bundle contains no functional assay results for NM_024675.4:c.2945G>T: literature_pass total_pmids = 0, paper_extracts.json = {}, fulltext_map.json = {}
  • SpliceAI (max delta 0.003) and REVEL (0.158) are in silico predictions, not well-established functional assays, and cannot satisfy PS3 under generic ACMG/AMP (Richards et al. 2015)
Still missing
  • No variant-specific functional assay data for p.(Gly982Val) (e.g., PALB2 homology-directed repair / DNA-damage response assays, FA-N complementation assays, or other validated PALB2 functional assays) are present in the case bundle
  • No PMIDs were identified by the literature pass, so no functional study could be reviewed for this variant
Sources
PM1 VCEPNot applicable: the PALB2 VCEP disallows PM1 for missense variants, and p.(Gly982Val) is not in a cancer hotspot. Details ▾Hide ▴
Reasoning

vcep_materials.json domain_tables is empty for PALB2, so no VCEP-approved critical functional domain table exists to check residue Gly982 against (nothing to contradict the VCEP's own applicability designation). The governing ClinGen HBOC VCEP PALB2 v1.2 CSPEC explicitly marks PM1 'Not applicable' with the instruction 'Do not use: Missense pathogenic variation in PALB2 is not yet confirmed as a mechanism of disease.' The variant p.(Gly982Val) is a missense change and does not fall in a statistically significant cancer hotspot (CancerHotspots.org query for PALB2 G982 returned no result). PM1 is therefore not applicable under the governing framework.

VCEP rule
Do not use: Missense pathogenic variation in PALB2 is not yet confirmed as a mechanism of disease.
Evidence considered
  • vcep_materials.json domain_tables is empty for PALB2; per pipeline convention an empty domain_tables means no authoritative VCEP domain table was extracted for this gene.
  • ClinGen HBOC VCEP PALB2 v1.2 (cspec) PM1 applicability: 'Not applicable'; instruction: 'Do not use: Missense pathogenic variation in PALB2 is not yet confirmed as a mechanism of disease.' All PM1 strength rules are marked Not applicable.
  • CancerHotspots.org query for 'PALB2 G982' returned no result; the variant is not in a statistically significant cancer hotspot (evidence.json, hotspots result).
Still missing
  • vcep_materials.json contains no PALB2 domain_tables entry (key present but empty), so PM1 was decided on the VCEP's explicit not-applicable designation rather than by domain-boundary analysis.
Sources
PM4 VCEPNot applicable: PM4 covers in-frame indels or stop-loss variants, and this missense change preserves the reading frame and protein length. Details ▾Hide ▴
Reasoning

PM4 addresses protein length changes due to in-frame deletions/insertions in a non-repeat region or stop-loss variants. The PALB2 HBOC VCEP v1.2 specification explicitly marks PM4 'Not applicable' with the instruction 'Do not use for in-frame insertions or deletions less than a single exon; Use for stop-loss variants, only.' The variant is a missense substitution (p.Gly982Val) that preserves the reading frame and protein length (no in-frame indel, no stop-loss); PM4 is therefore not applicable.

VCEP rule
PM4 not applicable: 'Do not use for in-frame insertions or deletions less than a single exon; Use for stop-loss variants, only.'
Evidence considered
  • PALB2 HBOC VCEP v1.2 (cspec) declares PM4 'Not applicable' and restricts its use to stop-loss variants only; in-frame insertions/deletions smaller than a single exon are not to be used.
  • Variant consequence is a single-amino-acid substitution p.(Gly982Val): protein length is unchanged (NP_078951.2, Gly->Val at position 982), with no in-frame insertion/deletion and no stop-loss at the termination codon.
  • SpliceAI max delta score 0.003 shows no predicted splice impact, so no in-frame exon-level splice event is implicated.
Sources
cspec ↗pvs1_variant_assessmentspliceai ↗
PM5 N/ANot applicable: the PALB2 VCEP restricts PM5 to truncating variants upstream of p.Tyr1183, not missense changes. Details ▾Hide ▴
Reasoning

Under the governing ClinGen HBOC VCEP PALB2 v1.2 CSPEC, PM5 applies only to frameshifting or truncating variants with premature termination codons upstream of p.Tyr1183 (and NMD-prone splice variants where PVS1_VS(RNA) is applied), and the instructions explicitly state 'Do not use for missense changes: Missense changes are not yet confirmed as a mechanism of disease for PALB2.' c.2945G>T is a missense change (p.(Gly982Val)) with no predicted splice impact, so it is outside the scope of the VCEP's PM5 rule. Consistent with this, the pm5_candidates artifact reports mode 'truncation_cutoff_gene_specific', eligible_for_classic_pm5_search = false, recommendation level 'not_applicable', and zero same-residue candidate variants.

Rule
Do not use for missense changes: Missense changes are not yet confirmed as a mechanism of disease for PALB2. Supporting: Apply to frameshifting or truncating variants with premature termination codons upstream of p.Tyr1183.
Evidence considered
  • ClinGen HBOC VCEP PALB2 v1.2 (cspec) PM5 instructions: 'Based on location of the most C-terminal known pathogenic variant, p.Tyr1183*. Use as PM5_Supporting (not moderate). Do not use for missense changes: Missense changes are not yet confirmed as a mechanism of disease for PALB2.' Supporting rule: 'Apply to frameshifting or truncating variants with premature termination codons upstream of p.Tyr1183. Apply to splice variants as with premature termination codons upstream of p.Tyr1183 where PVS1_VS(RNA) is applied based on high quality observed splicing impact and must be NMD prone.'
  • pm5_candidates.json summary: pm5_mode = 'truncation_cutoff_gene_specific', eligible_for_classic_pm5_search = false, recommendation level = 'not_applicable' ('PM5 is a truncation-cutoff or non-missense framework rule rather than classic same-residue missense PM5'), total_candidates_seen = 0, same_residue_candidates = 0.
Still missing
  • No same-residue missense comparator variants (other amino acid substitutions at Gly982) were collected in this case (pm5_candidates: total_candidates_seen = 0, same_residue_candidates = 0), so classic same-residue PM5 could not be evaluated even under a generic framework.
Sources
cspec ↗pm5_candidates
PM6 VCEPNot applicable: the PALB2 VCEP disallows PM6 for both AD and AR disease, as de novo occurrences are not yet informative. Details ▾Hide ▴
Reasoning

The governing framework (ClinGen HBOP Expert Panel PALB2 specification v1.2, cspec doc 1526222356) explicitly marks PM6 as Not applicable: informative de novo occurrences have not yet been observed for PALB2 AD disease, and de novo AR (Fanconi anemia) occurrences are too rare to be informative by phase. Per the VCEP instruction 'Do not use for AD or AR disease', PM6 is not applied.

VCEP rule
VCEP: Not applicable - 'Do not use for AD or AR disease: Informative de novo occurrences have not yet been observed and de novo AR conditions are unlikely to be informed by phase'
Evidence considered
  • The PALB2 VCEP marks PM6 as Not applicable with the instruction: 'Do not use for AD or AR disease: Informative de novo occurrences have not yet been observed and de novo AR conditions are unlikely to be informed by phase.'
  • Consistent with the VCEP applicability ruling, PM6 (assumed de novo without confirmation of paternity/maternity) is not applied to this variant.
  • No parental-testing or phase data exists in the case bundle, which is moot given the VCEP not-applicable ruling.
Sources
PP2 VCEPNot applicable: the PALB2 VCEP disallows PP2, as missense is not yet confirmed as a disease mechanism for PALB2. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOC VCEP PALB2 v1.2 CSPEC marks PP2 'Not applicable' with the instruction 'Do not use. Missense is not yet confirmed or refuted as a mechanism of disease for PALB2.' PP2 therefore cannot be applied to this missense variant (p.(Gly982Val)).

VCEP rule
Do not use. Missense is not yet confirmed or refuted as a mechanism of disease for PALB2.
Evidence considered
  • ClinGen HBOC VCEP PALB2 v1.2 (cspec) PP2 applicability: 'Not applicable'; instruction: 'Do not use. Missense is not yet confirmed or refuted as a mechanism of disease for PALB2.' All PP2 strength rules are marked Not applicable.
Sources
PP4 VCEPNot applicable: the PALB2 VCEP declares PP4 not applicable, so phenotype specificity is not used as a criterion. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOPC VCEP PALB2 v1.2 specification (cspec) explicitly declares PP4 'Not Applicable' (applicability field), so phenotype specificity is not used as an independent criterion for PALB2 variant classification under this specification. The generic ACMG/AMP PP4 rule is therefore not invoked.

VCEP rule
Not Applicable - ClinGen HBOPC VCEP PALB2 v1.2 (cspec)
Evidence considered
  • ClinGen HBOPC VCEP PALB2 v1.2 (cspec) lists PP4 with applicability 'Not Applicable', removing phenotype-specificity from the PALB2 criteria set.
  • No phenotype-specificity evidence (e.g., variant observed only in affected individuals with a highly specific phenotype) was available in the evidence bundle in any case.
Sources
PP5 VCEPNot applicable: the PALB2 VCEP disallows PP5, and the variant is absent from ClinVar so no expert-panel classification exists. Details ▾Hide ▴
Reasoning

Two independent reasons: (1) the governing ClinGen HBOPC VCEP PALB2 v1.2 specification (cspec) declares PP5 'Not Applicable'; and (2) PP5 may only be triggered by an exact-variant ClinVar expert-panel classification of Pathogenic/Likely Pathogenic, and this variant is absent from ClinVar entirely (no variation ID, no submissions, no review status), so no expert-panel classification exists to trigger PP5 even under the global PP5 policy. Ordinary laboratory submissions and aggregate labels are explicitly excluded and none exist here.

VCEP rule
Not Applicable - ClinGen HBOPC VCEP PALB2 v1.2 (cspec); no exact-variant ClinVar expert-panel classification exists
Evidence considered
  • ClinGen HBOPC VCEP PALB2 v1.2 (cspec) lists PP5 with applicability 'Not Applicable'.
  • evidence.json ClinVar lookup found no record: 'This variant is absent from ClinVar' (variation_ids=[], submissions=[], review_status=''), so there is no expert-panel (e.g., HBOPC VCEP) classification for c.2945G>T to support PP5; the only permitted PP5 trigger (exact-variant ClinVar expert-panel Pathogenic/Likely Pathogenic) is absent.
Still missing
  • Variant c.2945G>T is absent from ClinVar; an exact-variant ClinVar expert-panel classification (3-star) of Pathogenic/Likely Pathogenic would be required for PP5 to ever apply.
Sources
BS3 VCEPNot applicable: the PALB2 VCEP defines no BS3 rule, and no functional assay evidence exists for this variant. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOPC PALB2 VCEP v1.2 specification (cspec doc 1526222356) explicitly declares BS3 'Not Applicable' and defines no BS3 rule, so BS3 is not used in this framework. Independently, no assay evidence demonstrating absence of a damaging effect exists for p.(Gly982Val): there are no functional assay results in the case bundle (0 PMIDs, empty paper_extracts and fulltext_map), and OncoKB provides no variant-specific functional assessment. Absence from gnomAD is a population-frequency observation, not a functional assay, and cannot be used to conclude normal protein function. Thus BS3 could not be met under any framework.

Evidence considered
  • ClinGen HBOPC PALB2 VCEP v1.2 lists BS3 applicability as 'Not Applicable'; no BS3 rule is defined in the governing specification
  • No variant-specific functional data are available for this variant; OncoKB identifies no variant-specific functional evidence (Unknown Oncogenic Effect)
  • Variant absence in gnomAD v2.1/v4.1/Canada is a frequency observation and was not treated as functional evidence for BS3
  • Under generic ACMG/AMP, BS3 requires well-established functional studies showing no damaging effect (Richards et al. 2015), which are absent here
Still missing
  • No validated functional assay showing normal function for p.(Gly982Val) (e.g., homology-directed repair proficiency, BRCA2/PALB2 interaction, FA-N complementation) is available
  • No literature was retrieved for this variant that could support a benign functional effect
Sources
BP2 VCEPNot applicable: the PALB2 VCEP marks BP2 not applicable, so it is not used in this framework. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOPC PALB2 VCEP specification v1.2 (cspec) explicitly marks BP2 as 'Not Applicable' for PALB2, so the criterion is not used in this framework and no generic-ACMG fallback is permitted. The VCEP framework supersedes generic ACMG/AMP for PALB2, and this gene-specific determination is applied as-is regardless of the (also absent) generic ACMG data.

VCEP rule
BP2: Not Applicable (PALB2 VCEP v1.2)
Evidence considered
  • PALB2 VCEP (ClinGen HBOPC, cspec doc 1526222356, version 1.2) lists BP2 with applicability 'Not Applicable', removing the criterion from consideration for PALB2 variants
  • Generic ACMG BP2 (variant in cis with a pathogenic variant, or in trans with a pathogenic variant in a fully penetrant recessive disorder) is not applied because the applicable gene-specific framework declares BP2 not applicable
Sources
BP3 VCEPNot applicable: BP3 covers in-frame indels in non-functional repeat regions, and this variant is a missense substitution. Details ▾Hide ▴
Reasoning

BP3 addresses in-frame deletions/insertions in a repetitive region without a known function. The PALB2 HBOC VCEP v1.2 specification explicitly marks BP3 'Not applicable': 'Do not use: small in-frame losses are neither confirmed nor refuted as a mechanism of pathogenicity for PALB2. In addition, PALB2 is not considered to have repetitive regions without known function.' The variant is a missense substitution, not an in-frame indel, and no repeat-region context is involved; BP3 is therefore not applicable.

VCEP rule
BP3 not applicable: 'Do not use: small in-frame losses are neither confirmed nor refuted as a mechanism of pathogenicity for PALB2. In addition, PALB2 is not considered to have repetitive regions without known function.'
Evidence considered
  • PALB2 HBOC VCEP v1.2 (cspec) declares BP3 'Not applicable' because small in-frame losses are neither confirmed nor refuted as a mechanism of pathogenicity for PALB2 and PALB2 is not considered to have repetitive regions without known function.
  • Variant consequence is a missense substitution (p.Gly982Val) rather than an in-frame deletion/insertion, so the repetitive-region in-frame indel scenario BP3 was designed for does not arise.
  • SpliceAI max delta score 0.003 indicates no predicted splice impact, excluding a splice-based in-frame change.
Sources
cspec ↗pvs1_variant_assessmentspliceai ↗
BP4 N/ANot applicable: the PALB2 VCEP forbids BP4 for missense variants despite SpliceAI max delta 0.003 and REVEL 0.158. Details ▾Hide ▴
Reasoning

The governing PALB2 VCEP v1.2 BP4 rule (cspec doc 1526222356) states 'Missense: Do not use' (published predictors have yet to achieve functional outcome for PALB2 missense variants) and 'Splicing: No predicted impact via splicing (SpliceAI <=0.1). Do not apply for missense variants.' Because c.2945G>T is a missense variant (p.(Gly982Val)), BP4 is explicitly not applicable on either the missense-predictor sub-path or the splice sub-path. Although SpliceAI max delta 0.003 would numerically satisfy the <=0.1 splice threshold and REVEL 0.158 falls within the generic ClinGen SVI BP4_Moderate band (PMID 36413997), the governing VCEP forbids BP4 for missense variants, so BP4 is not applied and cannot contribute benign evidence here.

Evidence considered
  • PALB2 VCEP v1.2 BP4 rule: 'Missense: Do not use. Splicing: No predicted impact via splicing (SpliceAI <=0.1). Do not apply for missense variants.' c.2945G>T is missense (p.(Gly982Val)), so BP4 is explicitly excluded for this variant class (cspec doc 1526222356)
  • SpliceAI max delta = 0.003 would satisfy the VCEP splice-based BP4 threshold (<=0.1), but the VCEP explicitly forbids applying BP4 to missense variants, so BP4 is not applied
  • REVEL score 0.158: under the ClinGen SVI REVEL calibration (PMID 36413997) this score falls in the 0.016-0.184 BP4_Moderate band, but the governing PALB2 VCEP instructs 'Missense: Do not use' for BP4, so the score is not applied
  • BayesDel score -0.366285 was not applied: no verified published threshold for BP4 is available to this pipeline (insufficiently calibrated)
Still missing
  • No RNA functional data are available in the case bundle; under the VCEP, splice-based BP4 is in any case not applied to missense variants
  • The VCEP does not provide calibrated missense predictor thresholds for BP4 for PALB2, so no missense-path BP4 evaluation is possible under this framework
Sources
BP5 VCEPNot applicable: the PALB2 VCEP declares BP5 not applicable, so an alternate-molecular-basis rule is not used. Details ▾Hide ▴
Reasoning

The governing ClinGen HBOPC VCEP PALB2 v1.2 specification (cspec) explicitly declares BP5 'Not Applicable'. The generic ACMG/AMP BP5 rule (variant found in a case with an alternate molecular basis for disease) is therefore not invoked for PALB2. No evidence of an alternate molecular diagnosis was present in the bundle in any case.

VCEP rule
Not Applicable - ClinGen HBOPC VCEP PALB2 v1.2 (cspec)
Evidence considered
  • ClinGen HBOPC VCEP PALB2 v1.2 (cspec) lists BP5 with applicability 'Not Applicable'.
  • No evidence of an alternate molecular basis of disease in a carrier of this variant was identified anywhere in the evidence bundle.
Sources
BP6 VCEPNot applicable: the PALB2 VCEP disallows BP6, and the variant is absent from ClinVar so no expert-panel benign classification exists. Details ▾Hide ▴
Reasoning

Two independent reasons: (1) the governing ClinGen HBOPC VCEP PALB2 v1.2 specification (cspec) declares BP6 'Not Applicable'; and (2) BP6 may only be triggered by an exact-variant ClinVar expert-panel classification of Benign/Likely Benign, and this variant is absent from ClinVar entirely (no variation ID, no submissions, no review status), so no expert-panel classification exists to trigger BP6 even under the global BP6 policy. Ordinary laboratory submissions and aggregate labels are explicitly excluded and none exist here.

VCEP rule
Not Applicable - ClinGen HBOPC VCEP PALB2 v1.2 (cspec); no exact-variant ClinVar expert-panel classification exists
Evidence considered
  • ClinGen HBOPC VCEP PALB2 v1.2 (cspec) lists BP6 with applicability 'Not Applicable'.
  • evidence.json ClinVar lookup found no record: 'This variant is absent from ClinVar' (variation_ids=[], submissions=[], review_status=''), so there is no expert-panel classification for c.2945G>T to support BP6; the only permitted BP6 trigger (exact-variant ClinVar expert-panel Benign/Likely Benign) is absent.
Still missing
  • Variant c.2945G>T is absent from ClinVar; an exact-variant ClinVar expert-panel classification (3-star) of Benign/Likely Benign would be required for BP6 to ever apply.
Sources
BP7 N/ANot applicable: BP7 applies to synonymous and deep intronic variants, and this is a missense change in exon 9. Details ▾Hide ▴
Reasoning

The governing PALB2 VCEP v1.2 BP7 rule (cspec doc 1526222356) applies BP7 to synonymous variants and to deep intronic variants defined as further than (but not including) +7 and further than (but not including) -21 at donor and acceptor sites, respectively; the BP7(RNA) sub-rule requires an observed lack of aberrant RNA defect for silent substitutions and intronic variants. c.2945G>T is a missense variant (p.(Gly982Val)) in exon 9, not a synonymous or intronic variant, so neither the position-based BP7 rule nor the RNA-based BP7(RNA) sub-rule applies. No RNA functional data are present in the case bundle. BP7 is therefore not applicable.

Evidence considered
  • PALB2 VCEP v1.2 BP7 rule: 'BP7: Use for synonymous and deep intronic variants defined as further than (but not including) +7 and further than (but not including) -21 at donor and acceptor sites, respectively'; BP7(RNA) applies to observed lack of aberrant RNA defect for silent substitutions and intronic variants (cspec doc 1526222356)
  • NM_024675.4:c.2945G>T is a missense variant (NP_078951.2:p.(Gly982Val)) in exon 9, so the variant class is outside the scope of the BP7 rule
  • The case bundle contains no RNA assay results (literature_pass total_pmids = 0, paper_extracts.json = {}, fulltext_map.json = {})
Still missing
  • No RNA functional studies (patient RNA or minigene assays demonstrating lack of aberrant splicing) are available, so the BP7(RNA) sub-rules could not be evaluated
  • Variant is missense rather than synonymous/deep intronic, so the position-based BP7 rule does not apply regardless of RNA data
Sources

Identifiers

Gene
PALB2
Transcript
NM_024675.4
Coding (HGVS c.)
NM_024675.4:c.2945G>T
Protein (HGVS p.)
NP_078951.2:p.(Gly982Val)
GRCh38
chr16:23623020 C>A
GRCh37
chr16:23634341 C>A
Location and type
Exon 9 · missense

Gene diagram

Every interpreted variant in PALB2, mapped onto the exon structure of NM_024675.4. Select a row to find it on the plot.

PALB2NM_024675.4
Fetching transcript structure from UCSC…
gnomAD v4.1 Allele count data not recorded
gnomAD v2.1 Allele count data not recorded
gnomAD-Canada v1.0 Allele count data not recorded

Statements

gnomAD v4.1

Absent from gnomAD v4.1.

gnomAD v2.1

Absent from gnomAD v2.1.

gnomAD-Canada

Absent from gnomAD-Canada v1.0.

SpliceAI and Pangolin

SpliceAI acceptor lossat +80 bp
0.001
SpliceAI acceptor gainat +110 bp
0.002
SpliceAI donor lossat -252 bp
0.000
SpliceAI donor gainat -51 bp
0.003
Pangolin splice lossmagnitude shown
-0.001
Pangolin splice gain
0.001

Other predictors

REVEL
0.158
BayesDel
-0.366

How the predictions were used

PP3 Not met: splice-based PP3 requires SpliceAI >= 0.2, and the max delta is 0.003; the VCEP prohibits missense predictors. Details ▾Hide ▴
Reasoning

The governing ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer (HBOPC) Expert Panel Specification for PALB2 version 1.2 (cspec doc 1526222356) makes PP3 applicable but restricts its use: missense in-silico predictors must not be used ('Missense: Do not use' - published predictors have yet to achieve functional outcome for PALB2 missense variants), while splice-based PP3 (SpliceAI >=0.2) explicitly applies to silent, missense/in-frame, and intronic variants outside donor/acceptor 1,2 sites. c.2945G>T is a missense variant (p.(Gly982Val)) located in exon 9 (c.2835-2996), so the splice sub-path applies. SpliceAI returns max delta = 0.003 (DS_AG 0.002, DS_AL 0.001, DS_DG 0.003, DS_DL 0.0), far below the VCEP PP3 threshold of >=0.2, so no splice impact is predicted and PP3 is not met. REVEL (0.158) and BayesDel (-0.366285) were not applied as PP3 evidence: the VCEP prohibits missense predictors for PP3, and BayesDel has no verified published threshold for PP3/BP4.

Evidence considered
  • PALB2 VCEP v1.2 PP3 rule: 'Missense: Do not use. Splicing: Predicted impact via splicing (SpliceAI >=0.2) for silent, missense/in-frame and for intronic variants outside of donor and acceptor 1,2 sites.' The splice sub-path is explicitly applicable to missense/in-frame variants (cspec doc 1526222356)
  • SpliceAI lookup for NM_024675.4:c.2945G>T returns max delta = 0.003 (DS_AG 0.002, DS_AL 0.001, DS_DG 0.003, DS_DL 0.0), below the VCEP PP3 threshold of >=0.2, indicating no predicted splice impact
  • VariantValidator/prefetch places c.2945G>T in exon 9 of NM_024675.4 (c.2835-2996), ~110 nt from the exon 9 acceptor and ~51 nt from the exon 9 donor, i.e., not within canonical donor/acceptor 1,2 positions
  • REVEL score 0.158 was consulted but not applied: the VCEP instructs 'Missense: Do not use' for PP3 because published predictors have yet to achieve functional outcome for PALB2 missense variants
  • BayesDel score -0.366285 was consulted but not applied: no verified published threshold for PP3/BP4 is available to this pipeline, so the score is treated as insufficiently calibrated
Still missing
  • No RNA functional studies (e.g., patient RNA or minigene assays) are present in the case bundle; the splice-impact determination rests on SpliceAI alone as specified by the VCEP
Sources
BP4 N/ANot applicable: the PALB2 VCEP forbids BP4 for missense variants despite SpliceAI max delta 0.003 and REVEL 0.158. Details ▾Hide ▴
Reasoning

The governing PALB2 VCEP v1.2 BP4 rule (cspec doc 1526222356) states 'Missense: Do not use' (published predictors have yet to achieve functional outcome for PALB2 missense variants) and 'Splicing: No predicted impact via splicing (SpliceAI <=0.1). Do not apply for missense variants.' Because c.2945G>T is a missense variant (p.(Gly982Val)), BP4 is explicitly not applicable on either the missense-predictor sub-path or the splice sub-path. Although SpliceAI max delta 0.003 would numerically satisfy the <=0.1 splice threshold and REVEL 0.158 falls within the generic ClinGen SVI BP4_Moderate band (PMID 36413997), the governing VCEP forbids BP4 for missense variants, so BP4 is not applied and cannot contribute benign evidence here.

Evidence considered
  • PALB2 VCEP v1.2 BP4 rule: 'Missense: Do not use. Splicing: No predicted impact via splicing (SpliceAI <=0.1). Do not apply for missense variants.' c.2945G>T is missense (p.(Gly982Val)), so BP4 is explicitly excluded for this variant class (cspec doc 1526222356)
  • SpliceAI max delta = 0.003 would satisfy the VCEP splice-based BP4 threshold (<=0.1), but the VCEP explicitly forbids applying BP4 to missense variants, so BP4 is not applied
  • REVEL score 0.158: under the ClinGen SVI REVEL calibration (PMID 36413997) this score falls in the 0.016-0.184 BP4_Moderate band, but the governing PALB2 VCEP instructs 'Missense: Do not use' for BP4, so the score is not applied
  • BayesDel score -0.366285 was not applied: no verified published threshold for BP4 is available to this pipeline (insufficiently calibrated)
Still missing
  • No RNA functional data are available in the case bundle; under the VCEP, splice-based BP4 is in any case not applied to missense variants
  • The VCEP does not provide calibrated missense predictor thresholds for BP4 for PALB2, so no missense-path BP4 evaluation is possible under this framework
Sources
BP7 N/ANot applicable: BP7 applies to synonymous and deep intronic variants, and this is a missense change in exon 9. Details ▾Hide ▴
Reasoning

The governing PALB2 VCEP v1.2 BP7 rule (cspec doc 1526222356) applies BP7 to synonymous variants and to deep intronic variants defined as further than (but not including) +7 and further than (but not including) -21 at donor and acceptor sites, respectively; the BP7(RNA) sub-rule requires an observed lack of aberrant RNA defect for silent substitutions and intronic variants. c.2945G>T is a missense variant (p.(Gly982Val)) in exon 9, not a synonymous or intronic variant, so neither the position-based BP7 rule nor the RNA-based BP7(RNA) sub-rule applies. No RNA functional data are present in the case bundle. BP7 is therefore not applicable.

Evidence considered
  • PALB2 VCEP v1.2 BP7 rule: 'BP7: Use for synonymous and deep intronic variants defined as further than (but not including) +7 and further than (but not including) -21 at donor and acceptor sites, respectively'; BP7(RNA) applies to observed lack of aberrant RNA defect for silent substitutions and intronic variants (cspec doc 1526222356)
  • NM_024675.4:c.2945G>T is a missense variant (NP_078951.2:p.(Gly982Val)) in exon 9, so the variant class is outside the scope of the BP7 rule
  • The case bundle contains no RNA assay results (literature_pass total_pmids = 0, paper_extracts.json = {}, fulltext_map.json = {})
Still missing
  • No RNA functional studies (patient RNA or minigene assays demonstrating lack of aberrant splicing) are available, so the BP7(RNA) sub-rules could not be evaluated
  • Variant is missense rather than synonymous/deep intronic, so the position-based BP7 rule does not apply regardless of RNA data
Sources

Statement

In silico

SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.158. BayesDel score = -0.366285.

0 paper records listed. No publication is explicitly linked to an applied criterion in the recorded metadata.

Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.

All source links

Statements for reports

The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.

gnomAD v4.1

Absent from gnomAD v4.1.

gnomAD v2.1

Absent from gnomAD v2.1.

gnomAD-Canada

Absent from gnomAD-Canada v1.0.

ClinVar

This variant is absent from ClinVar.

In silico

SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.158. BayesDel score = -0.366285.

Functional

OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. PALB2, a scaffolding protein involved in DNA repair, is altered in various cancers.

Somatic

This variant does not lie in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).

Cancer Hotspots

This variant does not lie in a statistically significant hotspot.