1-45331488-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4BP6

The NM_001048174.2(MUTYH):c.1171G>A(p.Ala391Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000874 in 1,614,058 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A391D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000099 ( 1 hom., cov: 33)

Exomes 𝑓: 0.000086 ( 0 hom. )

Consequence

MUTYH
NM_001048174.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:10B:2

Conservation

PhyloP100: 2.12

Variant links:

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]

MUTYH links:

ENSG00000288208 (HGNC:):

ENSG00000288208 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 16 uncertain in NM_001048174.2

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.28824985).

BP6

Variant 1-45331488-C-T is Benign according to our data. Variant chr1-45331488-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 135983.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=1, Uncertain_significance=10}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MUTYH	NM_001048174.2 link	c.1171G>A	p.Ala391Thr	missense_variant	Exon 13 of 16	ENST00000456914.7	NP_001041639.1	Q9UIF7-6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MUTYH	ENST00000456914.7 link	c.1171G>A	p.Ala391Thr	missense_variant	Exon 13 of 16	1	NM_001048174.2	ENSP00000407590.2		Q9UIF7-6
ENSG00000288208	ENST00000671898.1 link	n.1759G>A		non_coding_transcript_exon_variant	Exon 17 of 21			ENSP00000499896.1		A0A5F9ZGZ0

Frequencies

GnomAD3 genomes

AF:

0.0000985

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000482

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000637

AC:

AN:

251158

Hom.:

AF XY:

0.0000663

AC XY:

AN XY:

135800

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000141

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000862

AC:

126

AN:

1461826

Hom.:

Cov.:

AF XY:

0.0000715

AC XY:

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000926

Gnomad4 OTH exome

AF:

0.000381

GnomAD4 genome

AF:

0.0000985

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74372

show subpopulations

Gnomad4 AFR

AF:

0.0000482

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000191

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000158

Hom.:

Bravo

AF:

0.000121

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:10Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Familial adenomatous polyposis 2

Uncertain:3Benign:1

Jul 19, 2016

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Dec 18, 2023

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces alanine with threonine at codon 419 of the MUTYH protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with MUTYH-associated polyposis, colorectal cancer, glioblastoma, and suspected Lynch syndrome (PMID: 17581577, 25980754, 26689913, Insight-database.org), This variant has been identified in 19/282560 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Hereditary cancer-predisposing syndrome

Uncertain:3Benign:1

May 07, 2021

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Oct 08, 2021

Sema4, Sema4

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Dec 07, 2022

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nov 29, 2024

Institute for Biomarker Research, Medical Diagnostic Laboratories, L.L.C.

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The missense variant NM_001128425.2(MUTYH):c.1255G>A (p.Ala419Thr) causes a change at the same amino acid residue as a previously established pathogenic variant. The p.Ala419Thr variant is observed in 16/113,578 (0.0141%) alleles from individuals of gnomAD Non Finnish European background in gnomAD. There is a small physicochemical difference between alanine and threonine, which is not likely to impact secondary protein structure as these residues share similar properties. For these reasons, this variant has been classified as Uncertain Significance. -

not provided

Uncertain:2

Mar 26, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Observed in individuals with Lynch-associated cancers and/or polyps, breast cancer, or glioblastoma, and also observed in control groups (PMID: 26689913, 33471991, 25980754); This variant is associated with the following publications: (PMID: 25980754, 19725997, 17581577, 17161978, 26689913, 33122805, 33471991, 23108399) -

Jul 24, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The MUTYH c.1255G>A (p.Ala419Thr) variant has been reported in the published literature in individuals with suspected Lynch syndrome (PMID: 25980754 (2015)) and glioblastoma (PMID: 26689913 (2015)). It has also been observed in several individuals with breast cancer and in reportedly healthy individuals in a case-control study (PMID: 33471991 (2021), see also LOVD (http://databases.lovd.nl/shared)). The frequency of this variant in the general population, 0.00013 (17/129004 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is uninformative in the assessment of its pathogenicity. Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. -

not specified

Uncertain:1

Nov 11, 2019

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: MUTYH c.1255G>A (p.Ala419Thr) results in a non-conservative amino acid change located in the C-terminal domain (IPR029119) and NUDIX hydrolase domains (IPR000086) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 6.4e-05 in 251158 control chromosomes (gnomAD). This frequency is not significantly higher than expected for a pathogenic variant in MUTYH causing MUTYH-associated Polyposis (6.4e-05 vs 0.0046), allowing no conclusion about variant significance. To our knowledge, there are no reports of c.1255G>A in individuals affected with MUTYH-associated Polyposis and no experimental evidence demonstrating an impact on protein function in the literature. c.1255G>A has been reported in an individual with Lynch syndrome (Yurgelun_2015) and in an individual with glioblastoma mulitforme (Lu_2015). These reports do not provide unequivocal conclusions about association of the variant with MUTYH-associated Polyposis. Eight other ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Neoplasm of stomach;C0206711:Pilomatrixoma;C3272841:Familial adenomatous polyposis 2

Uncertain:1

May 23, 2017

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.081

BayesDel_addAF

Benign

-0.14

BayesDel_noAF

Benign

-0.18

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.31

.;.;.;.;.;.;T;.;.;.;.;T

Eigen

Benign

0.024

Eigen_PC

Benign

0.055

FATHMM_MKL

Benign

0.72

LIST_S2

Uncertain

0.89

.;.;D;.;D;D;D;D;D;D;D;D

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.29

T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.25

MutationAssessor

Uncertain

2.8

.;.;.;.;.;.;M;.;.;.;.;.

PrimateAI

Benign

0.35

PROVEAN

Benign

-1.6

N;N;N;N;N;N;N;N;N;N;N;.

REVEL

Uncertain

0.41

Sift

Benign

0.044

D;T;T;T;T;T;T;T;T;D;T;.

Sift4G

Uncertain

0.030

D;T;T;T;T;T;T;T;T;D;T;T

Polyphen

0.0070, 0.84, 0.034

.;.;.;.;.;.;B;P;.;.;B;.

Vest4

0.31

MutPred

0.64

.;.;.;.;.;.;.;.;.;.;Gain of phosphorylation at A419 (P = 0.0471);.;

MVP

0.94

MPC

0.12

ClinPred

0.45

GERP RS

4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.12

gMVP

0.43

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over