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Variant interpretation report

ATM c.7974T>C, p.(Asn2658=)

NM_000051.4:c.7974T>C NP_000042.3:p.(Asn2658=) View identifiers
Classification
Likely benign

Variant description:

No variant summary was recorded for this case.

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

Likely benign.A likely benign classification under the recorded framework.

In plain language

Gene-level background from the recorded interpretation.

About ATM

No gene-level summary was recorded for this case.

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 ATM VCEP v1.5.0. 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: 2
Pathogenic criteria applied · 1
PM2Supporting
PM2 · supporting

This variant is present at very low frequency in gnomAD v4.1 (total AF = 0.00031%, 5/1,611,834 alleles, 0 homozygotes), meeting the VCEP PM2_Supporting threshold of ≤0.001%. Observed predominantly in the East Asian population (sub-population AF = 0.011%). Per VCEP guidance, PM2 is not considered conflicting evidence for variants that otherwise are likely benign/benign.

Benign criteria applied · 2
BP4Supporting
BP4 · supporting

SpliceAI predicts no splice impact (max delta = 0.0), meeting the VCEP BP4 threshold of SpliceAI ≤0.1 for splicing prediction. Multiple lines of computational evidence (SpliceAI) suggest no impact on splicing. REVEL not available for synonymous variants. Note: BP4 and BP7 both draw from the same underlying observation of absent splice impact; applied together they may overlap.

BP7Supporting
BP7 · supporting

NM_000051.4:c.7974T>C is a synonymous variant p.(Asn2658=) located in exon 54 (c.7939-c.8077). The variant is 35 nucleotides downstream of the acceptor site and 103 nucleotides upstream of the donor site, placing it well outside the VCEP-defined splice consensus regions (+7 donor, -21 acceptor). SpliceAI predicts no splice impact (max delta = 0.0). VCEP BP7 criteria for synonymous variants are met.

Recorded classification: Likely benign

Richards et.al., 2015 - Combining rules v1.5.0 criteria-combination framework: matched Rule19 (Benign.Supporting >=2) with applied criteria: PM2 supporting, BP4 supporting, BP7 supporting; maps to Likely Benign.

02The sources

Evidence at a glance

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

gnomAD v4.1
gnomAD v2.1
Population frequency
5 / 1,611,834 alleles

gnomAD v4.1: 5 / 1,611,834 alleles. Recorded AF 3.10206e-06. Recorded homozygote count 0.

gnomAD v2.1

This variant is present in gnomAD v2.1 (AF= 2.38796e-05; MAF= 0.00239%, 6/251260 alleles, homozygotes = 0) and has highest observed frequency in the East Asian population (AF= 0.000326193; MAF= 0.03262%, 6/18394 alleles, homozygotes = 0); grpmax FAF= 0.00014146.

gnomAD-Canada

Absent from gnomAD-Canada v1.0.

SpliceAI score
0.000 maximum delta

Recorded SpliceAI maximum delta score: 0.000. Refer to the recorded PP3/BP4 rationale for interpretation.

ClinVar submissions
5 reported laboratory submissions

4 Likely benign · 1 Benign.

Context only ClinVar ↗
Functional evidence
Statement recorded

OncoKB identified curated literature and non-variant-specific oncogenicity context for review; listed oncogenicity label: Unknown Oncogenic Effect.

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 ATM VCEP v1.5.0, with the data and sources behind each one.

26 criteria with recorded statuses: 3 met · 4 not met · 5 not assessed · 14 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.

Met Not met Not assessed Not applicable

NM_000051.4:c.7974T>C is a synonymous variant p.(Asn2658=) in ATM exon 54, located well outside the canonical splice consensus regions.

SpliceAI predicts no splice impact (max delta score = 0.00).

This variant is present in gnomAD v4.1 at very low frequency (total AF = 0.00031%, 5/1,611,834 alleles, 0 homozygotes), highest in East Asian population (sub-population AF = 0.011%).

ClinVar reports this variant as Likely benign (4 clinical laboratories) and Benign (1 laboratory); review status: criteria provided, single submitter (ClinVar Variation ID: 414583).

The ClinGen HBOP VCEP supplementary table (PMID:40580951, Table S1) classifies this variant as Likely benign with an eDA score of 3.10e-06.

BP7_Supporting is met: synonymous variant outside donor +7 and acceptor -21 splice regions with no predicted splice impact (SpliceAI = 0.0).

BP4_Supporting is met: no predicted impact via splicing (SpliceAI max delta = 0.0 ≤ 0.1). Note partial overlap with BP7.

PM2_Supporting is met: gnomAD v4.1 total allele frequency (0.00031%) is ≤ 0.001% VCEP threshold. Per VCEP guidance, PM2 is not considered conflicting evidence for variants that otherwise are likely benign/benign.

No pathogenic criteria beyond PM2_Supporting are met. Multiple benign supporting criteria (BP7, BP4) are met with no conflicting pathogenic evidence per VCEP PM2 guidance.

The ClinGen HBOP Expert Panel classification from the VCEP supplementary table is Likely benign, which is concordant with the evidence-based assessment.

Met · 3

PM2 SupportingThis variant is present at very low frequency in gnomAD v4.1 (total AF = 0.00031%, 5/1,611,834 alleles, 0 homozygotes), meeting the VCEP PM2_Supporting threshold of ≤0.001%. Observed predominantly in the East Asian population (sub-population AF = 0.011%). Per VCEP guidance, PM2 is not considered conflicting evidence for variants that otherwise are likely benign/benign. Details ▾Hide ▴
Evidence considered
  • gnomAD v4.1 total AF = 0.00031% (≤0.001% threshold).
  • VCEP PM2 is downgraded to Supporting strength only.
Sources
BP4 SupportingSpliceAI predicts no splice impact (max delta = 0.0), meeting the VCEP BP4 threshold of SpliceAI ≤0.1 for splicing prediction. Multiple lines of computational evidence (SpliceAI) suggest no impact on splicing. REVEL not available for synonymous variants. Note: BP4 and BP7 both draw from the same underlying observation of absent splice impact; applied together they may overlap. Details ▾Hide ▴
Evidence considered
  • SpliceAI max delta = 0.0 (≤ 0.1 BP4 threshold).
  • No predicted splice impact.
Sources
BP7 SupportingNM_000051.4:c.7974T>C is a synonymous variant p.(Asn2658=) located in exon 54 (c.7939-c.8077). The variant is 35 nucleotides downstream of the acceptor site and 103 nucleotides upstream of the donor site, placing it well outside the VCEP-defined splice consensus regions (+7 donor, -21 acceptor). SpliceAI predicts no splice impact (max delta = 0.0). VCEP BP7 criteria for synonymous variants are met. Details ▾Hide ▴
Evidence considered
  • Synonymous variant outside donor +7 and acceptor -21.
  • SpliceAI max delta = 0.0 (no predicted splice impact).
  • VCEP BP7_Supporting criteria satisfied.
Sources

Not met · 4 · evaluated, threshold not reached

PP3 SpliceAI predicts no splice impact (max delta = 0.0), failing the VCEP PP3 threshold of SpliceAI ≥0.2 for silent variants. REVEL score is unavailable for synonymous variants. No multiple lines of computational evidence support a deleterious effect. Details ▾Hide ▴
Evidence considered
  • SpliceAI max delta = 0.0 (< 0.2 PP3 threshold).
  • REVEL not available for synonymous variants.
Sources
PP5 The ClinGen HBOP VCEP supplementary table (PMID:40580951) classifies this variant as Likely benign. ClinVar lists this variant as Likely benign (4 clinical laboratories) and Benign (1 laboratory). No reputable source has reported this variant as pathogenic. PP5 requires a pathogenic assertion from a reputable source. Details ▾Hide ▴
Evidence considered
  • ClinVar: Likely benign (4 labs)
  • Benign (1 lab).
  • VCEP supplementary table classifies as Likely benign.
Sources
clinvar ↗vcep_suppl_tables1_pmid_40580951
BA1 gnomAD v4.1 grpmax filtering AF = 0.00435%, which does not exceed the VCEP BA1 threshold of >0.5%. Details ▾Hide ▴
Evidence considered
  • gnomAD v4.1 grpmax FAF = 0.00435% (≤ 0.5% BA1 threshold).
Sources
BS1 gnomAD v4.1 grpmax filtering AF = 0.00435%, which does not exceed the VCEP BS1 threshold of >0.05%. Details ▾Hide ▴
Evidence considered
  • gnomAD v4.1 grpmax FAF = 0.00435% (≤ 0.05% BS1 threshold).
Sources

Not assessed · 5 · no assessment recorded

PS3 No well-established in vitro or in vivo functional studies identified for this variant. The VCEP ATM kinase activity and radiosensitivity assay reference tables do not list c.7974T>C. No variant-specific functional data found in literature. Details ▾Hide ▴
Evidence considered
  • VCEP functional assay reference tables do not include this variant.
Still missing
  • No ATM kinase activity assay data.
  • No ATM radiosensitivity assay data.
Sources
vcep_clingen_hbop_atm_supplementary_tables_1_and_2_v1
PS4 No case-control studies demonstrating statistically significant enrichment of this variant in affected individuals versus controls are available. Literature review identified only general guidelines and review papers, none reporting variant-specific case-control data. Details ▾Hide ▴
Evidence considered
  • No case-control or cohort enrichment data identified.
Still missing
  • No case-control OR/RR data.
  • No proband counting studies.
PP1 No co-segregation data available for this variant. The VCEP restricts PP1 for ATM to AR condition only (segregation in A-T families). No A-T family segregation data identified. Details ▾Hide ▴
Evidence considered
  • No segregation data in A-T families available.
Still missing
  • No co-segregation data with A-T phenotype.
BS3 No well-established in vitro or in vivo functional studies demonstrating normal protein function or splicing for this variant. The VCEP ATM kinase activity and radiosensitivity reference tables (clingen_hbop_atm_supplementary_tables_1_and_2_v1.xlsx) do not include c.7974T>C. Details ▾Hide ▴
Evidence considered
  • VCEP functional assay reference tables do not include this variant.
Still missing
  • No ATM kinase activity rescue data.
  • No ATM radiosensitivity rescue data.
Sources
vcep_clingen_hbop_atm_supplementary_tables_1_and_2_v1
BP2 No evidence of this variant observed in trans with a pathogenic ATM variant in unaffected individuals (≥18 years, no A-T). No homozygous unaffected individuals identified. The VCEP BP2 point-based system requires specific proband-level data not available in the evidence sources provided. Details ▾Hide ▴
Evidence considered
  • No trans or homozygous observations in unaffected individuals.
Still missing
  • No co-occurrence data with pathogenic ATM variants in trans.
  • No homozygous unaffected adult observations.
Sources
cspec ↗vcep_atm_pm3_bp2_1_5
Not applicable · 14· recorded as not applicable Show reasons ▾Hide reasons ▴
PVS1 N/ANot a null variant. NM_000051.4:c.7974T>C is a synonymous substitution p.(Asn2658=); PVS1 is restricted to nonsense, frameshift, canonical ±1,2 splice sites, initiation codon, or exon deletion variants per VCEP ATM PVS1 decision tree. Details ▾Hide ▴
Evidence considered
  • VCEP ATM PVS1 v1.5 restricts application to null variant types.
Sources
vcep_atm_pvs1_1_5
PS1 N/ASynonymous variant p.(Asn2658=) does not alter the amino acid. PS1 requires the same amino acid change as a known pathogenic missense variant. Splice defect has been ruled out (SpliceAI max delta = 0.0). Details ▾Hide ▴
Evidence considered
  • SpliceAI predicts no splice impact
  • variant is synonymous.
Sources
vcep_atm_ps1_1_5spliceai ↗
PS2 VCEPVCEP ATM v1.5: 'Do not use for AD or AR disease: Informative de novo occurrences have not yet been observed.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly states PS2 is not applicable for ATM.
Sources
PM1 VCEPVCEP ATM v1.5: 'Do not use: Benign and pathogenic variants are known to occur within the same domains and germline mutational hotspots are not well defined at this time.' Details ▾Hide ▴
Evidence considered
  • VCEP ATM v1.5 explicitly marks PM1 as not applicable.
Sources
PM5 N/AVCEP ATM v1.5 PM5 applies only to frameshifting or truncating variants with premature termination codons upstream of p.Arg3047, or to splice variants with NMD-prone PTCs upstream of p.Arg3047. c.7974T>C is a synonymous variant with no PTC. Details ▾Hide ▴
Evidence considered
  • VCEP restricts PM5 to truncating/frameshift/splice variants upstream of p.Arg3047.
  • pm5_candidates confirms variant is not eligible for classic missense PM5.
Sources
cspec ↗pm5_candidates
PM6 VCEPVCEP ATM v1.5: '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.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks PM6 as not applicable for ATM.
Sources
PP2 VCEPVCEP ATM v1.5: 'Do not use: ATM does not have a defined low rate of missense benign variation.' Additionally, this is a synonymous variant, not missense. Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks PP2 as not applicable.
Sources
PP4 VCEPVCEP ATM v1.5: 'Autosomal Dominant: do not use as breast cancer is a disease with multiple genetic etiology. Autosomal Recessive: do not use as a separate line of evidence. Such evidence is built into the Ataxia Telangiectasia PM3|BP2 table.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks PP4 as not applicable for ATM.
Sources
BS2 VCEPVCEP ATM v1.5: 'Do not use: ATM has incomplete penetrance.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks BS2 as not applicable for ATM.
Sources
BS4 VCEPVCEP ATM v1.5: lack of co-segregation analysis not applicable. AD condition: co-segregation in low-penetrance genes can lead to false positives. AR condition: informative instances too rare. Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks BS4 as not applicable for ATM.
Sources
BP1 VCEPVCEP ATM v1.5: 'Do not use: Missense pathogenic variants are known for ATM.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks BP1 as not applicable for ATM.
Sources
BP5 VCEPVCEP ATM v1.5: 'Do not use: Cases with multiple pathogenic variants have been observed with no noticeable difference in phenotype. ATM has low penetrance and will naturally occur with other pathogenic variants more frequently.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks BP5 as not applicable for ATM.
Sources
BP6 VCEPVCEP ATM v1.5: 'Not Applicable for this VCEP' — 'This criterion is not for use as recommended by the ClinGen Sequence Variant Interpretation VCEP Review Committee.' Details ▾Hide ▴
Evidence considered
  • VCEP explicitly marks BP6 as not for use.
Sources
PS5 N/APS5 is not a standard ACMG/AMP criterion. The standard criteria set includes PVS1, PS1-PS4, PM1-PM6, PP1-PP5. There is no PS5 criterion in the ACMG/AMP 2015 framework (PMID:25741868). Details ▾Hide ▴
Evidence considered
  • PS5 does not exist in the ACMG/AMP 2015 criteria.
Sources

Identifiers

Gene
ATM
Transcript
NM_000051.4
Coding (HGVS c.)
NM_000051.4:c.7974T>C
Protein (HGVS p.)
NP_000042.3:p.(Asn2658=)
GRCh38
chr11:108333932 T>C
GRCh37
chr11:108204659 T>C
ClinVar
414583

Gene diagram

Every interpreted variant in ATM, mapped onto the exon structure of NM_000051.4. Select a row to find it on the plot.

ATMNM_000051.4
Fetching transcript structure from UCSC…
gnomAD v4.1 5 / 1,611,834 alleles AF 3.1e-06 · 0 homozygotes · FAF 4.35e-05
gnomAD v2.1 6 / 251,260 alleles AF 2.39e-05 · 0 homozygotes · FAF 0.000141
gnomAD-Canada v1.0 Allele count data not recorded

By genetic ancestry

gnomAD v4.1

AF 3.1e-06 · 5 / 1,611,834 alleles · 0 hom · FAF 4.3e-05
East Asian5 / 44,876 0.00011
0 alternate alleles recorded in 9 other groups: Remaining individuals, Admixed American, European (Finnish), Amish, Middle Eastern, South Asian, Ashkenazi Jewish, African/African American, European (non-Finnish).

gnomAD v2.1

AF 2.4e-05 · 6 / 251,260 alleles · 0 hom · FAF 0.00014
East Asian6 / 18,394 0.00033
0 alternate alleles recorded in 7 other groups: African/African American, Admixed American, Ashkenazi Jewish, European (Finnish), European (non-Finnish), Remaining individuals, South Asian.

Statements

gnomAD v4.1

This variant is present in gnomAD v4.1 (AF= 3.10206e-06; MAF= 0.00031%, 5/1611834 alleles, homozygotes = 0) and has highest observed frequency in the East Asian population (AF= 0.000111418; MAF= 0.01114%, 5/44876 alleles, homozygotes = 0); grpmax FAF= 4.346e-05.

gnomAD v2.1

This variant is present in gnomAD v2.1 (AF= 2.38796e-05; MAF= 0.00239%, 6/251260 alleles, homozygotes = 0) and has highest observed frequency in the East Asian population (AF= 0.000326193; MAF= 0.03262%, 6/18394 alleles, homozygotes = 0); grpmax FAF= 0.00014146.

gnomAD-Canada

Absent from gnomAD-Canada v1.0.

SpliceAI and Pangolin

SpliceAI acceptor lossat -163 bp
0.000
SpliceAI acceptor gainat -46 bp
0.000
SpliceAI donor lossat -372 bp
0.000
SpliceAI donor gainat +36 bp
0.000
Pangolin splice lossmagnitude shown
-0.010
Pangolin splice gain
0.030

Other predictors

REVEL
Not available
BayesDel
Not available

How the predictions were used

BP4 SupportingSpliceAI predicts no splice impact (max delta = 0.0), meeting the VCEP BP4 threshold of SpliceAI ≤0.1 for splicing prediction. Multiple lines of computational evidence (SpliceAI) suggest no impact on splicing. REVEL not available for synonymous variants. Note: BP4 and BP7 both draw from the same underlying observation of absent splice impact; applied together they may overlap. Details ▾Hide ▴
Evidence considered
  • SpliceAI max delta = 0.0 (≤ 0.1 BP4 threshold).
  • No predicted splice impact.
Sources
BP7 SupportingNM_000051.4:c.7974T>C is a synonymous variant p.(Asn2658=) located in exon 54 (c.7939-c.8077). The variant is 35 nucleotides downstream of the acceptor site and 103 nucleotides upstream of the donor site, placing it well outside the VCEP-defined splice consensus regions (+7 donor, -21 acceptor). SpliceAI predicts no splice impact (max delta = 0.0). VCEP BP7 criteria for synonymous variants are met. Details ▾Hide ▴
Evidence considered
  • Synonymous variant outside donor +7 and acceptor -21.
  • SpliceAI max delta = 0.0 (no predicted splice impact).
  • VCEP BP7_Supporting criteria satisfied.
Sources
PP3 SpliceAI predicts no splice impact (max delta = 0.0), failing the VCEP PP3 threshold of SpliceAI ≥0.2 for silent variants. REVEL score is unavailable for synonymous variants. No multiple lines of computational evidence support a deleterious effect. Details ▾Hide ▴
Evidence considered
  • SpliceAI max delta = 0.0 (< 0.2 PP3 threshold).
  • REVEL not available for synonymous variants.
Sources

Statement

In silico

SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00).

7 paper records listed. No publication is explicitly linked to an applied criterion in the recorded metadata. None of the listed paper records explicitly indicates that the variant is named.

Recorded publications

  • Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology.
    Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the ACMG and AMP. This is the foundational ACMG/AMP 2015 guideline paper. NM_000051.4:c.7974T>C was not identified in this paper.
    Does not name this variant
    PMID 25741868 ↗
  • PMID 24432435
    No paper-specific finding is recorded.
    PMID 24432435 ↗
  • Cancer Genetics Risk Assessment and Counseling (PDQ®): Health Professional Versi
    Cancer Genetics Risk Assessment and Counseling (PDQ): Health Professional Version. A general cancer genetics review. No variant-specific mention of NM_000051.4:c.7974T>C.
    Does not name this variant
    PMID 26389258 ↗
  • Risk Assessment, Genetic Counseling, and Genetic Testing for BRCA-Related Cancer: US Preventive Services Task Force Recommendation Statement.
    Risk Assessment, Genetic Counseling, and Genetic Testing for BRCA-Related Cancer: USPSTF Recommendation Statement. Focuses on BRCA1/2 testing recommendations; no ATM variant-specific data.
    Does not name this variant
    PMID 31429903 ↗
  • ACMG SF v3.1 list for reporting of secondary findings in clinical exome and genome sequencing: A policy statement of the American College of Medical Genetics and Genomics (ACMG).
    ACMG SF v3.1 list for reporting of secondary findings in clinical exome and genome sequencing. Policy statement listing genes for secondary findings reporting; no variant-specific data.
    Does not name this variant
    PMID 35802134 ↗
  • EFNS guidelines on the molecular diagnosis of ataxias and spastic paraplegias.
    Gasser T et al. · 2010
    EFNS guidelines on the molecular diagnosis of ataxias and spastic paraplegias. General diagnostic guidelines for ataxia disorders; no ATM variant-specific data.
    Does not name this variant
    PMID 20050888 ↗
  • Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.
    Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria. A classification framework paper; no variant-specific mention of c.7974T>C.
    Does not name this variant
    PMID 28492532 ↗

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

This variant is present in gnomAD v4.1 (AF= 3.10206e-06; MAF= 0.00031%, 5/1611834 alleles, homozygotes = 0) and has highest observed frequency in the East Asian population (AF= 0.000111418; MAF= 0.01114%, 5/44876 alleles, homozygotes = 0); grpmax FAF= 4.346e-05.

gnomAD v2.1

This variant is present in gnomAD v2.1 (AF= 2.38796e-05; MAF= 0.00239%, 6/251260 alleles, homozygotes = 0) and has highest observed frequency in the East Asian population (AF= 0.000326193; MAF= 0.03262%, 6/18394 alleles, homozygotes = 0); grpmax FAF= 0.00014146.

gnomAD-Canada

Absent from gnomAD-Canada v1.0.

ClinVar

This variant has been reported in ClinVar as Likely benign (4 clinical laboratories) and as Benign (1 clinical laboratory). (ClinVarID = 414583)

In silico

SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00).

Functional

OncoKB identified curated literature and non-variant-specific oncogenicity context for review; listed oncogenicity label: Unknown Oncogenic Effect.

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.