1-45332180-G-C

Position:

• chr1-45332180-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001048174.2(MUTYH):​c.835C>G​(p.Arg279Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,878 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 (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: MUTYH NM_001048174.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 1.07

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.41205144).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MUTYH	NM_001128425.2	c.919C>G	p.Arg307Gly	missense_variant	10/16	ENST00000710952.2	NP_001121897.1
MUTYH	NM_001048174.2	c.835C>G	p.Arg279Gly	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	c.919C>G	p.Arg307Gly	missense_variant	10/16		NM_001128425.2	ENSP00000518552
MUTYH	ENST00000456914.7	c.835C>G	p.Arg279Gly	missense_variant	10/16	1	NM_001048174.2	ENSP00000407590	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461878 Hom.: 0 Cov.: 36 AF XY: 0.00 AC XY: 0 AN XY: 727240

Gnomad4 AFR exome AF: 0.0000299

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Feb 06, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jun 29, 2022	The p.R307G variant (also known as c.919C>G), located in coding exon 10 of the MUTYH gene, results from a C to G substitution at nucleotide position 919. The arginine at codon 307 is replaced by glycine, an amino acid with dissimilar properties. This amino acid position is not 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. -

Familial adenomatous polyposis 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 17, 2023

This sequence change replaces arginine, which is basic and polar, with glycine, which is neutral and non-polar, at codon 307 of the MUTYH protein (p.Arg307Gly). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with MUTYH-related conditions. ClinVar contains an entry for this variant (Variation ID: 823087). 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	0.16
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.10
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Benign	0.27	.;.;.;.;.;T;.;.;.;T;.;T
Eigen	Benign	-0.039
Eigen_PC	Benign	0.013
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	.;D;.;D;D;D;D;D;D;D;D;T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.41	T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.39	D
MutationAssessor	Uncertain	2.4	.;.;.;.;.;M;.;.;.;.;.;.
MutationTaster	Benign	0.74	D;D;D;D;D;D;D;D;D;D;D;D;D;N
PrimateAI	Benign	0.23	T
PROVEAN	Uncertain	-3.6	D;D;D;D;D;D;D;D;D;.;D;D
REVEL	Uncertain	0.57
Sift	Uncertain	0.016	D;D;D;D;D;D;D;D;D;.;T;D
Sift4G	Benign	0.13	T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.26, 0.71, 0.38	.;.;.;.;.;B;P;.;B;.;.;.
Vest4		0.60
MutPred		0.31		.;.;.;.;.;.;.;.;Loss of solvent accessibility (P = 0.1235);.;.;.;
MVP		0.98
MPC		0.50
ClinPred		0.95	D
GERP RS		2.7
Varity_R		0.36
gMVP		0.56

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

Other links and lift over

dbSNP: rs759822330; hg19: chr1-45797852;