5-112840963-G-T

Position:

• chr5-112840963-G-T

Variant summary

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

The NM_000038.6(APC):​c.5369G>T​(p.Arg1790Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: APC NM_000038.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 1.90

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]

ENSG00000258864 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
APC	NM_000038.6	c.5369G>T	p.Arg1790Ile	missense_variant	16/16	ENST00000257430.9	NP_000029.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
APC	ENST00000257430.9	c.5369G>T	p.Arg1790Ile	missense_variant	16/16	5	NM_000038.6	ENSP00000257430.4
ENSG00000258864	ENST00000520401.1	n.228+11991G>T		intron_variant		3		ENSP00000454861.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 54

GnomAD4 genome Cov.: 33

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

Sep 29, 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. This variant has not been reported in the literature in individuals affected with APC-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces arginine with isoleucine at codon 1790 of the APC protein (p.Arg1790Ile). The arginine residue is moderately conserved and there is a moderate physicochemical difference between arginine and isoleucine. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 20, 2023

The p.R1790I variant (also known as c.5369G>T), located in coding exon 15 of the APC gene, results from a G to T substitution at nucleotide position 5369. The arginine at codon 1790 is replaced by isoleucine, an amino acid with similar properties. This amino acid position is conserved. 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	0.19
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	19
DANN	Uncertain	0.98
DEOGEN2	Benign	0.36	T;T
Eigen	Benign	-0.032
Eigen_PC	Benign	0.084
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.90	.;D
M_CAP	Benign	0.067	D
MetaRNN	Uncertain	0.45	T;T
MetaSVM	Benign	-0.45	T
MutationAssessor	Benign	0.69	N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.49	N;N
REVEL	Uncertain	0.37
Sift	Uncertain	0.0070	D;D
Sift4G	Benign	0.12	T;T
Polyphen		0.57	P;P
Vest4		0.53
MutPred		0.36		Gain of ubiquitination at K1791 (P = 0.0219);Gain of ubiquitination at K1791 (P = 0.0219);
MVP		0.91
ClinPred		0.67	D
GERP RS		3.2
Varity_R		0.072
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-112176660;