1-45332439-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PM5

The NM_001048174.2(MUTYH):c.656G>A(p.Arg219Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. R219G) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

MUTYH
NM_001048174.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 5.46

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 Likely_pathogenic. Variant got 6 ACMG points.

PM1

In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 16 uncertain in NM_001048174.2

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr1-45332440-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 587355.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MUTYH	NM_001048174.2 link	c.656G>A	p.Arg219Gln	missense_variant	Exon 9 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.656G>A	p.Arg219Gln	missense_variant	Exon 9 of 16	1	NM_001048174.2	ENSP00000407590.2		Q9UIF7-6
ENSG00000288208	ENST00000671898.1 link	n.1244G>A		non_coding_transcript_exon_variant	Exon 13 of 21			ENSP00000499896.1		A0A5F9ZGZ0

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000799

AC:

AN:

250424

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135610

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:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461804

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727202

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:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Data not reliable, filtered out with message: AS_VQSR

AF:

0.00000657

AC:

AN:

152216

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Familial adenomatous polyposis 2

Uncertain:3

Jun 14, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 247 of the MUTYH protein (p.Arg247Gln). This variant is present in population databases (rs777335285, gnomAD 0.006%). 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. This variant disrupts the p.Arg247 amino acid residue in MUTYH. Other variant(s) that disrupt this residue have been observed in individuals with MUTYH-related conditions (PMID: 31285513), which suggests that this may be a clinically significant amino acid residue. 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 tolerated. ClinVar contains an entry for this variant (Variation ID: 406828). This missense change has been observed in individual(s) with colonic polyps (PMID: 24470512; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. -

Jan 23, 2023

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 05, 2024

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 arginine with glutamine at codon 247 of the MUTYH protein. Computational prediction is inconclusive regarding the impact of this variant on protein structure and function (internally defined REVEL score threshold 0.5 < inconclusive < 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported biallelic and heterozygouls in individuals affected with MUTYH-associated polyposis, but phase and/or second mutation was not determined (PMID: 24470512, 29330641). This variant has been identified in 2/250424 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. -

Hereditary cancer-predisposing syndrome

Uncertain:2

Oct 03, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Dec 13, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.R247Q variant (also known as c.740G>A), located in coding exon 9 of the MUTYH gene, results from a G to A substitution at nucleotide position 740. The arginine at codon 247 is replaced by glutamine, an amino acid with highly similar properties. This alteration was identified once in a cohort of 405 patients with at least 10 colonic polyps (Guarinos C et al. Clin. Cancer Res., 2014 Mar;20:1158-68), and in a cohort of 31 Japanese patients with suspected hereditary polyposis (Takao M et al. Int J Clin Oncol, 2018 Jun;23:497-503). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this variant remains unclear. -

not provided

Uncertain:1

Apr 24, 2019

Quest Diagnostics Nichols Institute San Juan Capistrano

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

0.23

BayesDel_addAF

Benign

-0.037

BayesDel_noAF

Benign

-0.11

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.29

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

Eigen

Uncertain

0.23

Eigen_PC

Uncertain

0.23

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.92

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

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.71

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

MetaSVM

Uncertain

0.31

MutationAssessor

Uncertain

2.2

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

PrimateAI

Benign

0.47

PROVEAN

Uncertain

-2.9

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

REVEL

Uncertain

0.58

Sift

Uncertain

0.024

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

Sift4G

Benign

0.079

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

Polyphen

0.87, 0.92, 0.94

.;.;.;.;.;P;P;.;P;.;.;.

Vest4

0.58

MutPred

0.59

.;.;.;.;.;.;.;.;Loss of methylation at R247 (P = 0.0143);.;.;.;

MVP

0.90

MPC

0.18

ClinPred

0.91

GERP RS

4.7

Varity_R

0.89

gMVP

0.75

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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