1-45331243-C-T

Position:

• chr1-45331243-C-T

Variant summary

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

The NM_001048174.2(MUTYH):​c.1331G>A​(p.Gly444Asp) 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. 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: 33)
• Consequence: MUTYH NM_001048174.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.00

Genes affected

MUTYH (HGNC:7527): (mutY DNA glycosylase) This gene encodes a DNA glycosylase involved in oxidative DNA damage repair. The enzyme excises adenine bases from the DNA backbone at sites where adenine is inappropriately paired with guanine, cytosine, or 8-oxo-7,8-dihydroguanine, a major oxidatively damaged DNA lesion. The protein is localized to the nucleus and mitochondria. This gene product is thought to play a role in signaling apoptosis by the introduction of single-strand breaks following oxidative damage. Mutations in this gene result in heritable predisposition to colorectal cancer, termed MUTYH-associated polyposis (MAP). Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2017]

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=0.24642575).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MUTYH	NM_001128425.2	c.1415G>A	p.Gly472Asp	missense_variant	14/16	ENST00000710952.2	NP_001121897.1
MUTYH	NM_001048174.2	c.1331G>A	p.Gly444Asp	missense_variant	14/16	ENST00000456914.7	NP_001041639.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MUTYH	ENST00000710952.2	c.1415G>A	p.Gly472Asp	missense_variant	14/16		NM_001128425.2	ENSP00000518552
MUTYH	ENST00000456914.7	c.1331G>A	p.Gly444Asp	missense_variant	14/16	1	NM_001048174.2	ENSP00000407590	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Familial adenomatous polyposis 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 13, 2021

This variant has not been reported in the literature in individuals with MUTYH-related conditions. 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, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with aspartic acid at codon 472 of the MUTYH protein (p.Gly472Asp). The glycine residue is moderately conserved and there is a moderate physicochemical difference between glycine and aspartic acid. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.050
CADD	Benign	18
DANN	Benign	0.77
DEOGEN2	Benign	0.30	.;.;.;.;.;.;T;.;.;.;.;T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.24	N
LIST_S2	Benign	0.75	.;.;T;.;T;T;T;T;T;T;T;T
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.25	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	.;.;.;.;.;.;M;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-1.5	N;N;N;N;N;N;N;N;N;N;N;.
REVEL	Uncertain	0.58
Sift	Benign	0.086	T;T;T;T;T;T;T;T;T;T;T;.
Sift4G	Benign	0.35	T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.0010, 0.0050, 0.0030	.;.;.;.;.;.;B;B;.;.;B;.
Vest4		0.29
MutPred		0.54		.;.;.;.;.;.;.;.;.;.;Loss of sheet (P = 0.1158);.;
MVP		0.89
MPC		0.16
ClinPred		0.37	T
GERP RS		4.3
Varity_R		0.077
gMVP		0.30

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: chr1-45796915; COSMIC: COSV58345108; COSMIC: COSV58345108;