rs2229993

chr5-112842515-G-Achr5-112842515-G-Cchr5-112842515-G-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_000038.6(APC):c.6921G>A(p.Ser2307=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00212 in 1,613,912 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. S2307S) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0014 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0022 (5 hom.)
• Consequence: APC NM_000038.6 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:23
• Conservation: PhyloP100: -0.254

Genes affected

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.77).
• BP6: Variant 5-112842515-G-A is Benign according to our data. Variant chr5-112842515-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 136411.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-112842515-G-A is described in Lovd as [Likely_benign]. Variant chr5-112842515-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=-0.254 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00135 (206/152162) while in subpopulation NFE AF= 0.00235 (160/67990). AF 95% confidence interval is 0.00206. There are 1 homozygotes in gnomad4. There are 86 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 206 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APC	NM_000038.6	c.6921G>A	p.Ser2307=	synonymous_variant	16/16	ENST00000257430.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APC	ENST00000257430.9	c.6921G>A	p.Ser2307=	synonymous_variant	16/16	5	NM_000038.6	P1

Frequencies

GnomAD3 genomes AF: 0.00136 AC: 207 AN: 152044 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000628

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000458

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.000849

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00235

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.00145 AC: 364 AN: 250966 Hom.: 1 AF XY: 0.00143 AC XY: 194 AN XY: 135640

Gnomad AFR exome AF: 0.000431

Gnomad AMR exome AF: 0.000666

Gnomad ASJ exome AF: 0.000199

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.00102

Gnomad NFE exome AF: 0.00263

Gnomad OTH exome AF: 0.00131

GnomAD4 exome AF: 0.00220 AC: 3211 AN: 1461750 Hom.: 5 Cov.: 34 AF XY: 0.00213 AC XY: 1550 AN XY: 727178

Gnomad4 AFR exome AF: 0.000508

Gnomad4 AMR exome AF: 0.000626

Gnomad4 ASJ exome AF: 0.000268

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000104

Gnomad4 FIN exome AF: 0.00152

Gnomad4 NFE exome AF: 0.00264

Gnomad4 OTH exome AF: 0.00224

GnomAD4 genome AF: 0.00135 AC: 206 AN: 152162 Hom.: 1 Cov.: 32 AF XY: 0.00116 AC XY: 86 AN XY: 74396

Gnomad4 AFR AF: 0.000626

Gnomad4 AMR AF: 0.000458

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.000849

Gnomad4 NFE AF: 0.00235

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00182 Hom.: 0

Bravo AF: 0.00155

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.00273

EpiControl AF: 0.00202

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:23

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:9

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jan 30, 2019	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 06, 2014	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Apr 27, 2017	- -
Likely benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	-	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Mar 03, 2017	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -

not provided Benign:6

Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Feb 23, 2016	Variant summary: The APC c.6921G>A variant affects a non-conserved nucleotide, resulting in a synonymous change at Ser2307. 5/5 Alamut algorithms predict no significant change to normal splicing. ESEfinder predicts a loss of binding motif for RNA splicing enhancer. These in silico predictions have not been verified with in vitro/in vivo functional studies. This variant was found in 169/120898 control chromosomes at a frequency of 0.0013979, which is about 23 times the maximal expected frequency of a pathogenic APC allele (0.0000602), suggesting this variant is benign. In addition, multiple clinical laboratories database classified this variant as benign. Taken together, this variant was classified as benign. -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	May 01, 2024	APC: BP4, BP7, BS1 -

Hereditary cancer-predisposing syndrome Benign:5

Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 18, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.	Apr 18, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Dec 13, 2014	This alteration is classified as 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. -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	Oct 18, 2020	- -
Likely benign, no assertion criteria provided	clinical testing	True Health Diagnostics	Sep 11, 2017	- -

Carcinoma of colon Benign:1

Likely benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The APC, c.6921G>A, p.Ser2307Ser variant is not expected to have clinical significance because it does not alter an amino acid residue and is not located near a splice junction. It is listed in dbSNP database (ID#: rs2229993) with a global minor allele frequency (MAF) of 0.001/3. It has been reported in the InSiGHT colon cancer database as a rare familial variant found in a proband with an attenuated colorectal phenotype and sebaceous cysts. The number of probands with the variant, was not provided. In addition, this variant is not of the type that is expected to cause the disorder. In summary, we cannot rule out the possibility that this variant may contribute to the phenotype in this individual, but based on the above information this variant is classified as predicted benign. -

APC-Associated Polyposis Disorders Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Familial adenomatous polyposis 1 Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.77
CADD	Benign	1.6
DANN	Benign	0.76

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs2229993; hg19: chr5-112178212; COSMIC: COSV104567403; COSMIC: COSV104567403;