ClinVar Miner

Submissions for variant NM_001048171.1(MUTYH):c.425G>A (p.Trp142Ter) (rs762307622)

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Total submissions: 7
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000213856 SCV000274683 pathogenic Hereditary cancer-predisposing syndrome 2019-04-23 criteria provided, single submitter clinical testing The p.W156* pathogenic mutation (also known as c.467G>A), located in coding exon 6 of the MUTYH gene, results from a G to A substitution at nucleotide position 467. This changes the amino acid from a tryptophan to a stop codon within coding exon 6. This alteration was reported as a germline mutation in an individual with advanced stage colorectal cancer whose tumor showed loss of heterozygosity for MUTYH (Pilati C et al. J. Pathol. 2017 May;242:10-15). 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.
GeneDx RCV000235993 SCV000292870 pathogenic not provided 2017-04-21 criteria provided, single submitter clinical testing This variant is denoted MUTYH c.467G>A at the cDNA level and p.Trp156Ter (W156X) at the protein level. The substitution creates a nonsense variant, which changes a Tryptophan to a premature stop codon (TGG>TAG), and is predicted to cause loss of normal protein function through either protein truncation or nonsense-mediated mRNA decay. This variant, also reported as W142X using alternate nomenclature, has been observed in at least two individuals with colorectal cancer (Guan 2015, Pilati 2017) and is considered pathogenic.
Counsyl RCV000411443 SCV000487319 likely pathogenic MYH-associated polyposis 2015-12-13 criteria provided, single submitter clinical testing
Invitae RCV000411443 SCV000545719 pathogenic MYH-associated polyposis 2020-08-17 criteria provided, single submitter clinical testing This sequence change creates a premature translational stop signal (p.Trp156*) in the MUTYH gene. It is expected to result in an absent or disrupted protein product. This variant is present in population databases (rs762307622, ExAC 0.06%). This variant has been reported in the literature in individuals affected with colorectal cancer (PMID: 25151137, 28127763). This variant is also known as c.425G>A (p.W142X) in the literature. ClinVar contains an entry for this variant (Variation ID: 230971). Loss-of-function variants in MUTYH are known to be pathogenic (PMID: 18534194, 20663686). For these reasons, this variant has been classified as Pathogenic.
Color Health, Inc RCV000213856 SCV000685631 pathogenic Hereditary cancer-predisposing syndrome 2021-02-16 criteria provided, single submitter clinical testing This variant changes 1 nucleotide in exon 6 of the MUTYH gene, creating a premature translation stop signal. This variant is also known as p.W142X (c.425G>A) in the literature based on an alternate trasncript NM_001048171. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in individuals affected with colorectal cancer (PMID: 25151137, 28127763, 30151276). In two of these individuals, tumors showed loss of hetereozygosity for the MUTYH gene (PMID: 28127763, 30151276). This variant has been identified in 16/281728 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of MUTYH function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic.
Department of Pediatrics,Memorial Sloan Kettering Cancer Center RCV000411443 SCV001478129 pathogenic MYH-associated polyposis 2020-12-15 criteria provided, single submitter research
Department of Pathology and Laboratory Medicine,Sinai Health System RCV001353489 SCV000592683 pathogenic Carcinoma of colon no assertion criteria provided clinical testing The MUTYH p.Trp156X variant was not identified in the literature nor was it identified in the NHLBI Exome Sequencing Project (Exome Variant Server), GeneInsight COGR, COSMIC, MutDB, InSiGHT Colon Cancer, Zhejiang Colon Cancer, the ClinVar, Clinvitae and UMD Colon Cancer Genes databases. The variant is listed in the dbSNP database (ID#: rs762307622) but no frequency information was provided, thus the prevalence of this variant in the general population could not be determined. The variant was identified in Exome Aggregation Consortium (ExAC) database (January 13, 2015) in 6 of 121000 alleles (frequency: 0.00005) or 5 of 8628 East Asian and 1 other population alleles and was not found in a population of South Asians, European (Non-Finnish), African, Latino, European (Finnish) and other individuals. The p.Trp156X variant leads to a premature stop codon at position 156, which is predicted to lead to a truncated or absent protein and loss of function. Loss of function variants in the MUTYH gene are an established mechanism of disease in MUTYH-associated polyposis. In summary, based on the above information, this variant meets our laboratory’s criteria to be classified as pathogenic.

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