rs1553125016

chr1-45331243-C-Achr1-45331243-C-T

Variant summary

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

The NM_001048174.2(MUTYH):c.1331G>T(p.Gly444Val) 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 (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G444R) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MUTYH NM_001048174.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• 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 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MUTYH	NM_001128425.2	c.1415G>T	p.Gly472Val	missense_variant	14/16	ENST00000710952.2
MUTYH	NM_001048174.2	c.1331G>T	p.Gly444Val	missense_variant	14/16	ENST00000456914.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MUTYH	ENST00000710952.2	c.1415G>T	p.Gly472Val	missense_variant	14/16		NM_001128425.2
MUTYH	ENST00000456914.7	c.1331G>T	p.Gly444Val	missense_variant	14/16	1	NM_001048174.2	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Gastric cancer;C3272841:Familial adenomatous polyposis 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Aug 12, 2021

- -

Familial adenomatous polyposis 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 29, 2023

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 472 of the MUTYH protein (p.Gly472Val). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of MUTYH-associated polyposis (Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 533310). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. RNA analysis performed to evaluate the impact of this missense change on mRNA splicing indicates it does not significantly alter splicing (Invitae). 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	0.19
BayesDel_addAF	Pathogenic	0.31	D
BayesDel_noAF	Pathogenic	0.21
Cadd	Benign	20
Dann	Benign	0.90
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.26
FATHMM_MKL	Benign	0.65	D
M_CAP	Uncertain	0.19	D
MetaRNN	Uncertain	0.45	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.51	T
MutationTaster	Benign	0.98	D;D;D;D;D;D;D;D;D;D;D;D;D;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-2.3	N;N;N;N;N;N;N;N;N;N;N;.
REVEL	Uncertain	0.62
Sift	Benign	0.084	T;T;T;T;T;T;T;T;T;T;T;.
Sift4G	Uncertain	0.059	T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.19, 0.46, 0.33	.;.;.;.;.;.;B;P;.;.;B;.
Vest4		0.49
MutPred		0.58		.;.;.;.;.;.;.;.;.;.;Gain of sheet (P = 0.0827);.;
MVP		0.91
MPC		0.35
ClinPred		0.38	T
GERP RS		4.3
Varity_R		0.13
gMVP		0.46

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: rs1553125016; hg19: chr1-45796915;