rs1553128005

chr1-45332415-C-Achr1-45332415-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_001048174.2(MUTYH):c.680G>T(p.Ser227Ile) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. S227G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MUTYH NM_001048174.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.64

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 4 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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MUTYH	NM_001128425.2	c.764G>T	p.Ser255Ile	missense_variant	9/16	ENST00000710952.2
MUTYH	NM_001048174.2	c.680G>T	p.Ser227Ile	missense_variant	9/16	ENST00000456914.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MUTYH	ENST00000710952.2	c.764G>T	p.Ser255Ile	missense_variant	9/16		NM_001128425.2
MUTYH	ENST00000456914.7	c.680G>T	p.Ser227Ile	missense_variant	9/16	1	NM_001048174.2	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 12, 2022

The p.S255I variant (also known as c.764G>T), located in coding exon 9 of the MUTYH gene, results from a G to T substitution at nucleotide position 764. The serine at codon 255 is replaced by isoleucine, an amino acid with dissimilar properties. This amino acid position is conserved. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Uncertain	0.085	D
BayesDel_noAF	Benign	-0.12
Cadd	Benign	21
Dann	Benign	0.97
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.27
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.34	D
MetaRNN	Uncertain	0.55	D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.12	T
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Benign	0.48	T
PROVEAN	Uncertain	-3.8	D;D;D;D;D;D;D;D;D;D;D;D
REVEL	Uncertain	0.35
Sift	Uncertain	0.019	D;D;D;D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.057	T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.30, 0.26, 0.30	.;.;.;.;.;B;B;.;B;.;.;.
Vest4		0.58
MutPred		0.44		.;.;.;.;.;.;.;.;Loss of disorder (P = 0.0157);.;.;.;
MVP		0.88
MPC		0.34
ClinPred		0.94	D
GERP RS		3.0
Varity_R		0.53
gMVP		0.73

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr1-45798087;