chr5-112838836-G-T

Position:

• chr5-112838836-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000038.6(APC):​c.3242G>T​(p.Ser1081Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S1081N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: APC NM_000038.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.74

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11930093).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APC	NM_000038.6	c.3242G>T	p.Ser1081Ile	missense_variant	16/16	ENST00000257430.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APC	ENST00000257430.9	c.3242G>T	p.Ser1081Ile	missense_variant	16/16	5	NM_000038.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial adenomatous polyposis 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 31, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). This variant has not been reported in the literature in individuals with APC-related conditions. ClinVar contains an entry for this variant (Variation ID: 482493). This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with isoleucine at codon 1081 of the APC protein (p.Ser1081Ile). The serine residue is moderately conserved and there is a large physicochemical difference between serine and isoleucine. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 30, 2017

The p.S1081I variant (also known as c.3242G>T), located in coding exon 15 of the APC gene, results from a G to T substitution at nucleotide position 3242. The serine at codon 1081 is replaced by isoleucine, an amino acid with dissimilar properties. This amino acid position is not well conserved in available vertebrate species. In addition, in silico predictors for this gene do not accurately predict pathogenicity. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.077	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	14
DANN	Benign	0.95
DEOGEN2	Uncertain	0.46	.;T;T;T
Eigen	Benign	-0.75
Eigen_PC	Benign	-0.62
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	D;.;D;D
M_CAP	Uncertain	0.090	D
MetaRNN	Benign	0.12	T;T;T;T
MetaSVM	Benign	-0.37	T
MutationAssessor	Benign	0.81	.;L;L;.
MutationTaster	Benign	0.97	N;N;N
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-1.8	N;N;N;N
REVEL	Benign	0.19
Sift	Uncertain	0.0040	D;D;D;D
Sift4G	Benign	0.078	T;T;T;T
Polyphen		0.070	.;B;B;.
Vest4		0.32, 0.33
MutPred		0.21		.;Loss of disorder (P = 0.0215);Loss of disorder (P = 0.0215);Loss of disorder (P = 0.0215);
MVP		0.85
ClinPred		0.17	T
GERP RS		0.51
Varity_R		0.15
gMVP		0.51

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: rs374380039; hg19: chr5-112174533; COSMIC: COSV57399738; COSMIC: COSV57399738;