5-112838759-A-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.3165A>T(p.Ile1055=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00423 in 1,614,158 control chromosomes in the GnomAD database, including 18 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0028 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0044 (18 hom.)
• Consequence: APC NM_000038.6 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:25
• Conservation: PhyloP100: 0.228

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=-0.6).
• BP6: Variant 5-112838759-A-T is Benign according to our data. Variant chr5-112838759-A-T is described in ClinVar as [Likely_benign]. Clinvar id is 132763.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr5-112838759-A-T is described in Lovd as [Likely_benign]. Variant chr5-112838759-A-T is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=0.228 with no splicing effect.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00276 (421/152336) while in subpopulation NFE AF= 0.00492 (335/68028). AF 95% confidence interval is 0.00449. There are 0 homozygotes in gnomad4. There are 180 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd at 421 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APC	NM_000038.6	c.3165A>T	p.Ile1055=	synonymous_variant	16/16	ENST00000257430.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APC	ENST00000257430.9	c.3165A>T	p.Ile1055=	synonymous_variant	16/16	5	NM_000038.6	P1

Frequencies

GnomAD3 genomes AF: 0.00277 AC: 421 AN: 152218 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000772

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000654

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00367

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00492

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.00304 AC: 763 AN: 250598 Hom.: 2 AF XY: 0.00303 AC XY: 411 AN XY: 135438

Gnomad AFR exome AF: 0.000616

Gnomad AMR exome AF: 0.000955

Gnomad ASJ exome AF: 0.00149

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000392

Gnomad FIN exome AF: 0.00282

Gnomad NFE exome AF: 0.00548

Gnomad OTH exome AF: 0.00197

GnomAD4 exome AF: 0.00438 AC: 6405 AN: 1461822 Hom.: 18 Cov.: 33 AF XY: 0.00419 AC XY: 3045 AN XY: 727212

Gnomad4 AFR exome AF: 0.000806

Gnomad4 AMR exome AF: 0.000894

Gnomad4 ASJ exome AF: 0.00119

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000522

Gnomad4 FIN exome AF: 0.00270

Gnomad4 NFE exome AF: 0.00523

Gnomad4 OTH exome AF: 0.00495

GnomAD4 genome AF: 0.00276 AC: 421 AN: 152336 Hom.: 0 Cov.: 32 AF XY: 0.00242 AC XY: 180 AN XY: 74498

Gnomad4 AFR AF: 0.000770

Gnomad4 AMR AF: 0.000653

Gnomad4 ASJ AF: 0.000288

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00367

Gnomad4 NFE AF: 0.00492

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00420 Hom.: 1

Bravo AF: 0.00260

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.00420

EpiControl AF: 0.00385

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:25

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:9

Likely benign, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	-	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Apr 22, 2020	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Feb 19, 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	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Nov 18, 2016	- -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Feb 12, 2019	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -

not provided Benign:5

Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Likely benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2024	APC: BP4, BP7, BS1 -

Hereditary cancer-predisposing syndrome Benign:5

Benign, criteria provided, single submitter	clinical testing	Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.	Dec 12, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Mar 18, 2016	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 24, 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	Aug 26, 2020	- -
Likely benign, no assertion criteria provided	clinical testing	True Health Diagnostics	Sep 11, 2017	- -

Familial adenomatous polyposis 1 Benign:3

Benign, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Mar 18, 2024	This variant is considered benign. This variant is a silent/synonymous amino acid change and it is not expected to impact splicing. -
Benign, criteria provided, single submitter	clinical testing	Invitae	Feb 01, 2024	- -
Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -

Familial multiple polyposis syndrome Benign:1

Benign, criteria provided, single submitter

clinical testing

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Mar 25, 2015

- -

Carcinoma of colon Benign:1

Benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

The APC, p.Ile1055Ile variant was not identified in the literature nor was it identified in the GeneInsight COGR through the Canadian Open Genetics Repository, CLINVITAE, COSMIC or MutDB databases. The variant was identified in dbSNP (ID: rs61734287 “With Benign allele”, with a minor allele frequency of 0.001(5 of 5000 in 1000 Genomes Project). In NHLBI Exome Sequencing Project (Exome Variant Server) the variant was identified in 34 of 8600 European Americans and 4 of 4405 African Americans. In the Exome Aggregation Consortium (ExAC) database (released Oct 20th, 2014), the variant was identified in 428 of 120724 chromosomes (frequency: 0.003545) (or 394 of 66424 alleles in the European (Non-Finnish) - 2 of them homozygous, 17 of 6610 alleles in the European (Finnish), 7 of 10258 of Africans, 6 of 11508 Latinos, 4 of 16456 South Asians), increasing the likelihood this could be a low frequency benign variant. The variant was also identified in the Clinvar database and classified as benign by Invitae, by Gene DX and by Ambry genetics; classified as neutral in UMD database and co-occurred with a pathogenic variant - APC: c.1248C>G, p.Tyr416X. It was identified 2X in InSiGHT Colon Cancer Database and 1X in Zhejiang Colon Cancer Database.The p.Ile1055Ile variant is not expected to have clinical significance because it does not result in a change of amino acid and is not located in a known consensus splice site. In addition, in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. In summary, based on the above information, this variant meets our laboratory's criteria to be classified as 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.60
Cadd	Benign	4.1
Dann	Benign	0.83

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: rs61734287; hg19: chr5-112174456; COSMIC: COSV57352305; COSMIC: COSV57352305;