Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BS2BP4BP7BS1
This summary comes from the ClinGen Evidence Repository: The c.1746A>G (p.Glu582=) variant in APC is a synonymous (silent) variant that is not predicted to impact splicing (BP4, BP7). This variant has been observed in a heterozygous state in 12 unrelated healthy adult individuals worth 12 (≥ 10) healthy individual points in total (BS2; Ambry internal data). The highest population minor allele frequency of this variant in gnomAD v2.1.1 (non-cancer) is 0.0001148 in African/African American population, which is higher than the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis threshold (≥ 0.0001) for BS1, and therefore meets this criterion (BS1). In summary, this variant meets the criteria to be classified as Benign for FAP based on the ACMG/AMP criteria applied, as specified by the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel: BS1, BS2, BP4, and BP7 (VCEP specifications version 1; date of approval: 12/12/2022). LINK:https://erepo.genome.network/evrepo/ui/classification/CA10578326/MONDO:0021056/089
APC (HGNC:583): (APC regulator of WNT signaling pathway) This gene encodes a tumor suppressor protein that acts as an antagonist of the Wnt signaling pathway. It is also involved in other processes including cell migration and adhesion, transcriptional activation, and apoptosis. Defects in this gene cause familial adenomatous polyposis (FAP), an autosomal dominant pre-malignant disease that usually progresses to malignancy. Mutations in the APC gene have been found to occur in most colorectal cancers, where disease-associated mutations tend to be clustered in a small region designated the mutation cluster region (MCR) and result in a truncated protein product. [provided by RefSeq, Jun 2022]
The c.1746A>G (p.Glu582=) variant in APC is a synonymous (silent) variant that is not predicted to impact splicing (BP4, BP7). This variant has been observed in a heterozygous state in 12 unrelated healthy adult individuals worth 12 (more than 10) healthy individual points in total (BS2; Ambry internal data). The highest population minor allele frequency of this variant in gnomAD v2.1.1 (non-cancer) is 0.0001148 in African/African American population, which is higher than the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis threshold (0.0001) for BS1, and therefore meets this criterion (BS1). In summary, this variant meets the criteria to be classified as Benign for FAP based on the ACMG/AMP criteria applied, as specified by the ClinGen InSiGHT Hereditary Colorectal Cancer/Polyposis Variant Curation Expert Panel: BS1, BS2, BP4, and BP7 (VCEP specifications version 1; date of approval: 12/12/2022). -
Likely benign, criteria provided, single submitter
clinical testing
Labcorp Genetics (formerly Invitae), Labcorp
Dec 14, 2023
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Benign, criteria provided, single submitter
clinical testing
Myriad Genetics, Inc.
Mar 07, 2024
This variant is considered benign. This variant is a silent/synonymous amino acid change and it is not expected to impact splicing. -
Hereditary cancer-predisposing syndrome Benign:2
Likely benign, criteria provided, single submitter
clinical testing
Color Diagnostics, LLC DBA Color Health
Mar 24, 2017
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Likely benign, criteria provided, single submitter
clinical testing
Ambry Genetics
Apr 01, 2015
This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -
not specified Benign:1
Likely benign, criteria provided, single submitter
clinical testing
Genetic Services Laboratory, University of Chicago
Jan 03, 2020
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Classic or attenuated familial adenomatous polyposis Benign:1
Likely benign, criteria provided, single submitter
clinical testing
All of Us Research Program, National Institutes of Health
Dec 13, 2023
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not provided Benign:1
Benign, criteria provided, single submitter
clinical testing
GeneDx
Aug 17, 2015
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APC-related disorder Benign:1
Likely benign, no assertion criteria provided
clinical testing
PreventionGenetics, part of Exact Sciences
Apr 13, 2022
This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -