1-45332252-T-C

Position:

chr1-45332252-T-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong

The ENST00000456914.7(MUTYH):c.763A>G(p.Met255Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000031 in 1,613,902 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M255T) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

MUTYH
ENST00000456914.7 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 7.67

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PM1

In a helix (size 13) in uniprot entity MUTYH_HUMAN there are 11 pathogenic changes around while only 2 benign (85%) in ENST00000456914.7

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-45332251-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 406833.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=2}.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.965

PP5

Variant 1-45332252-T-C is Pathogenic according to our data. Variant chr1-45332252-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 232291.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-45332252-T-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MUTYH	NM_001128425.2 linkuse as main transcript	c.847A>G	p.Met283Val	missense_variant	10/16	ENST00000710952.2	NP_001121897.1
MUTYH	NM_001048174.2 linkuse as main transcript	c.763A>G	p.Met255Val	missense_variant	10/16	ENST00000456914.7	NP_001041639.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MUTYH	ENST00000710952.2 linkuse as main transcript	c.847A>G	p.Met283Val	missense_variant	10/16		NM_001128425.2	ENSP00000518552
MUTYH	ENST00000456914.7 linkuse as main transcript	c.763A>G	p.Met255Val	missense_variant	10/16	1	NM_001048174.2	ENSP00000407590	A1	Q9UIF7-6

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

152072

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250754

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135704

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:

0.00000883

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727214

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000180

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000132

AC:

AN:

152072

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74282

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial adenomatous polyposis 2

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 16, 2024	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Nov 11, 2023	This sequence change replaces methionine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 283 of the MUTYH protein (p.Met283Val). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This missense change has been observed in individual(s) with clinical features of MUTYH-related conditions (PMID: 16941501, 18172263). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 232291). 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. Experimental studies have shown that this missense change affects MUTYH function (PMID: 20848659, 23322991). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Hereditary cancer-predisposing syndrome

Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Jan 11, 2024	The p.M283V variant (also known as c.847A>G), located in coding exon 10 of the MUTYH gene, results from an A to G substitution at nucleotide position 847. The methionine at codon 283 is replaced by valine, an amino acid with highly similar properties. This variant has been reported in conjunction with a MUTYH pathogenic mutation in patients with multiple adenomas and/or colorectal cancer (Lejeune S et al, Hum. Mutat. 2006 Oct; 27(10):1064; van Puijenbroek M et al. Clin Cancer Res. 2008 Jan 1;14(1):139-42). In addition, functional studies have shown this alteration causes severe impairment in DNA glycosylase activity compared to the wild-type protein (Goto M et al. Hum. Mutat. 2010 Nov; 31(11):E1861-74); as well as suppression of oxidative mutagenesis, thought to severely impair function in human cells (Shinmura K et al. World J. Gastroenterol. 2012 Dec; 18(47):6935-42). Of note, this alteration is also designated as p.M269V (c.805A>G) in published literature. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jan 03, 2020	This missense variant replaces methionine with valine at codon 283 of the MUTYH protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). Splice site prediction tools suggest that this variant may not impact RNA splicing. Functional studies have reported the variant protein to be defective in the suppression of oxidative mutagenesis when expressed in human cell lines (PMID: 23322991) and in adenine DNA glycosylase assay in vitro (PMID: 20848659). This variant has been reported with a pathogenic MUTYH co-variant in two families affected with cancer of the cecum and colorectal polyposis (PMID: 18172263, 16941501). This variant has been identified in 1/250754 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Based on the available evidence, this variant is classified as Likely Pathogenic. -

Carcinoma of colon

Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The MUTYH p.Met283Val variant was identified in 2 of 460 proband chromosomes (frequency: 0.004) from individuals or families with colorectal cancer or cecum carcinoma (Lejeune 2006, Puijenbroek 2008). The variant was also identified in dbSNP (ID: rs876659676) as "With Pathogenic allele", ClinVar (classified as likely pathogenic by Ambry Genetics and Invitae; as pathogenic by GeneDx), Clinvitae, and in UMD-LSDB (10x as unclassified variant). In UMD the variant was identified with co-occurring pathogenic MUTYH variants (c.1059dup (p.Arg354GlnfsX164) and c.1105delC (p.Ala371ProfsX23)). The variant was not identified in the COGR, Cosmic, or MutDB databases. The variant was identified in control databases in 1 of 245722 chromosomes at a frequency of 0.000004 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the European (Non-Finnish) in 1 of 111308 chromosomes (freq: 0.00001); it was not observed in the African, Ashkenazi Jewish, East Asian, Finnish, Latino, Other, and South Asian populations. Several In vitro studies show that this variant severely reduces gycosylase activity. The variant protein exhibited only 4.5% of the glycosylase activity of the wild-type protein, which is more than 20-fold lower than that of the wildtype protein (Goto 2010, Shinmura 2012). The p.Met283 residue is conserved across mammals and other organisms, and four out of five computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) suggest that the variant may impact the protein; however, this information is not predictive enough to assume pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer, HumanSpliceFinder) do not predict a difference in splicing. In summary, based on the above information this variant meets our laboratoryâ€šÃ„Ã´s criteria to be classified as pathogenic. -

not provided

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Feb 13, 2023

Published functional studies demonstrate a damaging effect: reduced glycosylase activity and ability to suppress 8OHG-induced damage (Goto et al., 2010; Shinmura et al., 2012); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); Also known as c.763A>G (p.M255V); c.805A>G p.(M269V); This variant is associated with the following publications: (PMID: 20848659, 23605219, 30787465, 18172263, 16941501, 23322991, 25820570, 11092888, 11160897) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.38

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.54

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Benign

0.40

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

Eigen

Pathogenic

0.95

Eigen_PC

Pathogenic

0.86

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.99

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

M_CAP

Pathogenic

0.43

MetaRNN

Pathogenic

0.96

D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

5.0

.;.;.;.;.;H;.;.;.;.;.;.

MutationTaster

Benign

1.0

D;D;D;D;D;D;D;D;D;D;D;D;D;D

PrimateAI

Uncertain

0.66

PROVEAN

Uncertain

-3.8

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

REVEL

Pathogenic

0.95

Sift

Pathogenic

0.0

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

Sift4G

Pathogenic

0.0

D;D;D;D;D;D;D;D;D;D;D;D

Polyphen

1.0, 1.0

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

Vest4

0.98

MutPred

0.83

.;.;.;.;.;.;.;.;Loss of sheet (P = 0.1158);.;.;.;

MVP

0.98

MPC

0.56

ClinPred

1.0

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.81

gMVP

0.83

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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