About PTCH1
No gene-level summary was recorded for this case.
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.
Gene-level background from the recorded interpretation.
Words with a dotted underline have a short definition. Hover or tap them.No gene-level summary was recorded for this case.
The recorded framework is Not recorded. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.
The applied criteria and their strengths are shown as assessed under the stated framework.
This variant is present at extremely low frequency in population databases: gnomAD v2.1 AF = 0.00081% (2/246054 alleles, no homozygotes), gnomAD v4.1 AF = 0.00025% (4/1611580 alleles, no homozygotes). Both allele frequencies are below the ClinGen SVI PM2_Supporting threshold of ≤0.002%. Absent from gnomAD-Canada v1.0.
ClinVar contains a Benign classification from Labcorp Genetics (formerly Invitae), a reputable clinical diagnostic laboratory, submitted with criteria provided (SCV001497416; review status: criteria provided, single submitter). A second submitter (Ambry Genetics) classifies the variant as Uncertain significance. While not unanimous, the Benign classification from a major clinical laboratory supports a benign interpretation.
gene-specific framework lacked a usable explicit final combination framework, so generic ACMG/AMP 2015 final-combination rules were applied as fallback; applied criteria: PM2 supporting, BP6 supporting; combination = 1 supporting + 1 supporting benign, which maps to VUS.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 4 / 1,611,580 alleles. Recorded AF 2.48204e-06. Recorded homozygote count 0.
This variant is present in gnomAD v2.1 (AF= 8.1283e-06; MAF= 0.00081%, 2/246054 alleles, homozygotes = 0) and has highest observed frequency in the South Asian population (AF= 6.54279e-05; MAF= 0.00654%, 2/30568 alleles, homozygotes = 0); grpmax FAF= 1.083e-05.
Recorded SpliceAI maximum delta score: 0.000. Refer to the recorded PP3/BP4 rationale for interpretation.
1 Benign · 1 Uncertain significance.
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. PTCH1, a tumor suppressor and inhibitor of the hedgehog pathway, is recurrently mutated in basal cell carcinoma.
This variant has previously been reported in somatic cancers (COSMIC; COSV59465944, n = 3 times).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under Not recorded, with the data and sources behind each one.
26 criteria with recorded statuses: 2 met · 18 not met · 2 not assessed · 4 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000264.5:c.4033C>G (p.Arg1345Gly) is a missense variant in PTCH1, a gene in which loss-of-function variants cause Gorlin syndrome (nevoid basal cell carcinoma syndrome) via an autosomal dominant haploinsufficiency mechanism.
This variant is present at extremely low frequency in gnomAD v2.1 (AF=0.00081%, 2/246054 alleles) and gnomAD v4.1 (AF=0.00025%, 4/1611580 alleles), meeting PM2_Supporting (ClinGen SVI threshold ≤0.002%).
Computational predictors are uninformative or weakly benign: BayesDel score is -0.078 (benign range), SpliceAI delta is 0.00, and REVEL is not available. This does not meet thresholds for PP3 or BP4.
In ClinVar, Labcorp Genetics (formerly Invitae) has classified this variant as Benign (SCV001497416, criteria provided), while Ambry Genetics has classified it as Uncertain significance (SCV002619761). The Benign classification from a reputable clinical laboratory supports BP6_Supporting.
No functional studies, segregation data, de novo reports, case-control data, or variant-specific publications were identified for this variant. PVS1, PS1-PS5, PM1, PM5, PM6, PP1-PP5, and the benign criteria BA1, BS1-BS4, BP1-BP2, BP4-BP5, BP7 are either not met or not applicable.
The evidence profile yields one supporting pathogenic criterion (PM2_Supporting) and one supporting benign criterion (BP6_Supporting). Per generic ACMG/AMP 2015 combination rules (PMID:25741868), conflicting evidence with equal weight on both sides results in a classification of Variant of Uncertain Significance (VUS).
No criteria match.
Every interpreted variant in PTCH1, mapped onto the exon structure of NM_000264.5. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| South Asian4 / 91,070 | 4.4e-05 |
| South Asian2 / 30,568 | 6.5e-05 |
This variant is present in gnomAD v4.1 (AF= 2.48204e-06; MAF= 0.00025%, 4/1611580 alleles, homozygotes = 0) and has highest observed frequency in the South Asian population (AF= 4.39223e-05; MAF= 0.00439%, 4/91070 alleles, homozygotes = 0); grpmax FAF= 1.425e-05.
This variant is present in gnomAD v2.1 (AF= 8.1283e-06; MAF= 0.00081%, 2/246054 alleles, homozygotes = 0) and has highest observed frequency in the South Asian population (AF= 6.54279e-05; MAF= 0.00654%, 2/30568 alleles, homozygotes = 0); grpmax FAF= 1.083e-05.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). BayesDel score = -0.0783339.
8 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.
Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.
The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.
This variant is present in gnomAD v4.1 (AF= 2.48204e-06; MAF= 0.00025%, 4/1611580 alleles, homozygotes = 0) and has highest observed frequency in the South Asian population (AF= 4.39223e-05; MAF= 0.00439%, 4/91070 alleles, homozygotes = 0); grpmax FAF= 1.425e-05.
This variant is present in gnomAD v2.1 (AF= 8.1283e-06; MAF= 0.00081%, 2/246054 alleles, homozygotes = 0) and has highest observed frequency in the South Asian population (AF= 6.54279e-05; MAF= 0.00654%, 2/30568 alleles, homozygotes = 0); grpmax FAF= 1.083e-05.
This variant has been reported in ClinVar as Benign (1 clinical laboratory) and as Uncertain significance (1 clinical laboratory). (ClinVarID = 1010368)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). BayesDel score = -0.0783339.
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. PTCH1, a tumor suppressor and inhibitor of the hedgehog pathway, is recurrently mutated in basal cell carcinoma.
This variant does not lie in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV59465944, n = 3 times).
This variant does not lie in a statistically significant hotspot.