chr1-45331453-GGGCCCAGCCC-G

Position:

• chr1-45331453-GGGCCCAGCCC-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001048174.2(MUTYH):​c.1196_1205del​(p.Trp399SerfsTer22) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MUTYH NM_001048174.2 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.46

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-45331453-GGGCCCAGCCC-G is Pathogenic according to our data. Variant chr1-45331453-GGGCCCAGCCC-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 533306.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MUTYH	NM_001048174.2	c.1196_1205del	p.Trp399SerfsTer22	frameshift_variant	13/16	ENST00000456914.7
MUTYH	NM_001128425.2	c.1280_1289del	p.Trp427SerfsTer22	frameshift_variant	13/16	ENST00000710952.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MUTYH	ENST00000456914.7	c.1196_1205del	p.Trp399SerfsTer22	frameshift_variant	13/16	1	NM_001048174.2	A1
MUTYH	ENST00000710952.2	c.1280_1289del	p.Trp427SerfsTer22	frameshift_variant	13/16		NM_001128425.2

Frequencies

GnomAD3 genomes Cov.: 33

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Familial adenomatous polyposis 2 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Aug 07, 2023	ClinVar contains an entry for this variant (Variation ID: 533306). This sequence change creates a premature translational stop signal (p.Trp427Serfs*22) in the MUTYH gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MUTYH are known to be pathogenic (PMID: 18534194, 20663686). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with colorectal cancer (PMID: 27978560). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Oct 19, 2021	- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 02, 2023

The c.1280_1289del10 pathogenic mutation, located in coding exon 13 of the MUTYH gene, results from a deletion of 10 nucleotides at nucleotide positions 1280 to 1289, causing a translational frameshift with a predicted alternate stop codon (p.W427Sfs*22). This alteration has been previously identified in an individual from a North American cohort of individuals with early onset colon cancer (Pearlman R et al. JAMA Oncol, 2017 Apr;3:464-471). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1553125677; hg19: chr1-45797125;