5-112841072-G-T

Position:

• chr5-112841072-G-T

Variant summary

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

The NM_000038.6(APC):​c.5478G>T​(p.Lys1826Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: APC NM_000038.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.806

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 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.5478G>T	p.Lys1826Asn	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.5478G>T	p.Lys1826Asn	missense_variant	16/16	5	NM_000038.6	ENSP00000257430	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 65

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial adenomatous polyposis 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 04, 2018

This variant is not present in population databases (ExAC no frequency). This sequence change replaces lysine with asparagine at codon 1826 of the APC protein (p.Lys1826Asn). The lysine residue is highly conserved and there is a moderate physicochemical difference between lysine and asparagine. This variant has not been reported in the literature in individuals with APC-related disease. 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: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Benign	0.011	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.41	T;T
Eigen	Benign	-0.076
Eigen_PC	Benign	-0.085
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.94	.;D
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.48	T;T
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Benign	0.90	L;L
MutationTaster	Benign	0.83	D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.23	N;N
REVEL	Benign	0.24
Sift	Benign	0.17	T;T
Sift4G	Benign	0.59	T;T
Polyphen		0.96	D;D
Vest4		0.49
MutPred		0.28		Loss of ubiquitination at K1826 (P = 0.0037);Loss of ubiquitination at K1826 (P = 0.0037);
MVP		0.91
ClinPred		0.50	D
GERP RS		2.4
Varity_R		0.058
gMVP		0.48

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: rs768922376; hg19: chr5-112176769;