1-45332656-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_001048174.2(MUTYH):c.524G>C(p.Arg175Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000991 in 1,614,106 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 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. R175C) has been classified as Uncertain significance.

Frequency

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

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

MUTYH
NM_001048174.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7

Conservation

PhyloP100: 0.705

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 Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.27926147).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MUTYH	NM_001128425.2 linkuse as main transcript	c.608G>C	p.Arg203Pro	missense_variant	8/16	ENST00000710952.2
MUTYH	NM_001048174.2 linkuse as main transcript	c.524G>C	p.Arg175Pro	missense_variant	8/16	ENST00000456914.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MUTYH	ENST00000710952.2 linkuse as main transcript	c.608G>C	p.Arg203Pro	missense_variant	8/16		NM_001128425.2
MUTYH	ENST00000456914.7 linkuse as main transcript	c.524G>C	p.Arg175Pro	missense_variant	8/16	1	NM_001048174.2	A1	Q9UIF7-6

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152114

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:

0.000193

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:

0.0000199

AC:

AN:

251462

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135910

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000272

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000103

AC:

AN:

1461874

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000126

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000809

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74410

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000247

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Hereditary cancer-predisposing syndrome

Uncertain:3

Uncertain significance, criteria provided, single submitter	curation	Sema4, Sema4	Jan 05, 2022	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Jul 31, 2023	This missense variant replaces arginine with proline at codon 203 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 in individuals affected with breast and/or ovarian cancer (PMID: 30093976, 32068069, 33471991), colorectal cancer (PMID: 32658311), as well as several healthy individuals (PMID: 33471991). This variant has been identified in 5/251462 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Mar 21, 2023	The p.R203P variant (also known as c.608G>C), located in coding exon 8 of the MUTYH gene, results from a G to C substitution at nucleotide position 608. The arginine at codon 203 is replaced by proline, an amino acid with dissimilar properties. This alteration has been reported in multiple individuals diagnosed with breast cancer (Chan GHJ et al. Oncotarget, 2018 Jul;9:30649-30660; Kwong A et al. J Mol Diagn, 2020 Apr;22:544-554). This alteration was also seen in 0/732 breast cancer patients, 1/189 colorectal cancer patients and 0/490 cancer-free elderly controls in a Turkish population (Akcay IM et al. Int J Cancer, 2021 Jan;148:285-295). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Dec 31, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 27, 2020	In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in an individual with breast cancer (Chan 2018); This variant is associated with the following publications: (PMID: 17949294, 30093976) -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 06, 2017

The p.Arg203Pro variant in MUTYH has been reported in the heterozygous state in 1 French individual with colorectal adenomas, where a second MUTYH variant was n ot detected (Olschwang 2007, LOVD database: http://chromium.lovd.nl/LOVD2/colon_ cancer/home.php). It has also been reported in ClinVar (Variation ID 141400). In addition, this variant has been identified in 3/8652 of East Asian chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs538383136). Although this variant has been seen in the general population, i ts frequency is not high enough to rule out a pathogenic role. Computational pre diction tools and conservation analysis do not provide strong support for or aga inst an impact to the protein. In summary, the clinical significance of the p.Ar g203Pro variant is uncertain. -

Familial adenomatous polyposis 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 02, 2024

This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 203 of the MUTYH protein (p.Arg203Pro). This variant is present in population databases (rs538383136, gnomAD 0.03%). This missense change has been observed in individual(s) with breast and/or ovarian cancer (PMID: 30093976, 32068069). ClinVar contains an entry for this variant (Variation ID: 141400). 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. 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

0.20

BayesDel_addAF

Benign

-0.084

BayesDel_noAF

Uncertain

-0.060

Cadd

Benign

Dann

Uncertain

1.0

Eigen

Benign

-0.064

Eigen_PC

Benign

-0.12

FATHMM_MKL

Benign

0.65

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.28

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

MetaSVM

Uncertain

0.33

MutationTaster

Benign

0.95

D;D;D;D;N;N;N;N;N;N;N;N;N;N

PrimateAI

Benign

0.29

PROVEAN

Uncertain

-4.0

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

REVEL

Pathogenic

0.65

Sift

Uncertain

0.022

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

Sift4G

Benign

0.078

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

Polyphen

0.80, 1.0, 1.0

.;.;.;.;.;P;D;.;D;.;.;.

Vest4

0.68

MutPred

0.58

.;.;.;.;.;.;.;.;Gain of catalytic residue at P202 (P = 0.0164);.;.;.;

MVP

0.90

MPC

0.65

ClinPred

0.73

GERP RS

3.5

Varity_R

0.94

gMVP

0.77

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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