1-45334470-G-T

Variant names:

• chr1-45334470-G-T
• rs776396492
• NM_001128425.2:c.78C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001128425.2(MUTYH):​c.78C>A​(p.His26Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H26D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MUTYH NM_001128425.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.100
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• familial adenomatous polyposis 2

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, ClinGen, G2P
• colorectal cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen
• familial ovarian cancer

  Inheritance: AD, AR Classification: NO_KNOWN Submitted by: ClinGen
• hereditary breast carcinoma

  Inheritance: AD, AR Classification: NO_KNOWN Submitted by: ClinGen

ENSG00000288208 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.077762395).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MUTYH	NM_001128425.2	c.78C>A	p.His26Gln	missense_variant	Exon 2 of 16	ENST00000710952.2	NP_001121897.1
MUTYH	NM_001048174.2	c.36C>A	p.His12Gln	missense_variant	Exon 2 of 16	ENST00000456914.7	NP_001041639.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MUTYH	ENST00000710952.2	c.78C>A	p.His26Gln	missense_variant	Exon 2 of 16		NM_001128425.2	ENSP00000518552.2
MUTYH	ENST00000456914.7	c.36C>A	p.His12Gln	missense_variant	Exon 2 of 16	1	NM_001048174.2	ENSP00000407590.2
ENSG00000288208	ENST00000671898.1	n.582C>A		non_coding_transcript_exon_variant	Exon 6 of 21			ENSP00000499896.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Mar 23, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.H26Q variant (also known as c.78C>A), located in coding exon 2 of the MUTYH gene, results from a C to A substitution at nucleotide position 78. The histidine at codon 26 is replaced by glutamine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. 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	0.089
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	7.9
DANN	Benign	0.91
DEOGEN2	Benign	0.074	.;.;.;.;.;.;T;.;.;.;.;.;T;T;T
Eigen	Benign	-0.95
Eigen_PC	Benign	-0.98
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.63	.;.;T;.;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.078	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.45	T
MutationAssessor	Benign	1.5	.;.;.;.;.;.;L;L;L;.;.;.;.;.;.
PhyloP100		0.10
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.060	N;N;N;N;N;N;N;N;N;N;N;D;N;N;N
REVEL	Benign	0.023
Sift	Benign	0.38	T;T;T;T;T;T;T;T;T;T;T;T;D;T;T
Sift4G	Pathogenic	0.0	D;T;T;T;T;T;T;T;T;D;T;T;T;T;T
Polyphen		0.017, 0.31	.;.;.;.;.;.;B;B;.;.;B;.;.;.;.
Vest4		0.11
MutPred		0.19		.;.;.;.;.;.;Gain of solvent accessibility (P = 0.0837);Gain of solvent accessibility (P = 0.0837);Gain of solvent accessibility (P = 0.0837);.;Gain of solvent accessibility (P = 0.0837);.;.;.;.;
MVP		0.46
MPC		0.12
ClinPred		0.18	T
GERP RS		-0.88
Varity_R		0.037
gMVP		0.12
Mutation Taster		=86/14	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs776396492; hg19: chr1-45800142;