Submissions for variant NM_000249.4(MLH1):c.1682A>G (p.Tyr561Cys)

gnomAD frequency: 0.00001  dbSNP: rs1289807424

Total submissions: 11

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
Ambry Genetics	RCV000568554	SCV000669524	uncertain significance	Hereditary cancer-predisposing syndrome	2023-05-23	criteria provided, single submitter	clinical testing	The p.Y561C variant (also known as c.1682A>G), located in coding exon 15 of the MLH1 gene, results from an A to G substitution at nucleotide position 1682. The tyrosine at codon 561 is replaced by cysteine, an amino acid with highly dissimilar properties. This variant was reported in 2/60,466 breast cancer cases and in 1/53,461 controls (Dorling et al. N Engl J Med. 2021 02;384:428-439). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.
Counsyl	RCV000662503	SCV000785026	uncertain significance	Colorectal cancer, hereditary nonpolyposis, type 2	2017-03-16	criteria provided, single submitter	clinical testing
Color Diagnostics, LLC DBA Color Health	RCV000568554	SCV000909037	uncertain significance	Hereditary cancer-predisposing syndrome	2023-07-26	criteria provided, single submitter	clinical testing	This missense variant replaces tyrosine with cysteine at codon 561 of the MLH1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with MLH1-related disorders in the literature. This variant has been identified in 1/31396 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.
Labcorp Genetics (formerly Invitae), Labcorp	RCV000796646	SCV000936167	uncertain significance	Hereditary nonpolyposis colorectal neoplasms	2024-06-23	criteria provided, single submitter	clinical testing	This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 561 of the MLH1 protein (p.Tyr561Cys). This variant is present in population databases (no rsID available, gnomAD 0.01%). This missense change has been observed in individual(s) with clinical features of MLH1-related conditions (PMID: 10612827, 21520333). ClinVar contains an entry for this variant (Variation ID: 483536). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt MLH1 protein function with a positive predictive value of 95%. 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.
Mendelics	RCV002248787	SCV002518247	uncertain significance	not specified	2022-05-04	criteria provided, single submitter	clinical testing
Myriad Genetics, Inc.	RCV000662503	SCV004020264	uncertain significance	Colorectal cancer, hereditary nonpolyposis, type 2	2023-03-10	criteria provided, single submitter	clinical testing	This variant is classified as a variant of uncertain significance as there is insufficient evidence to determine its impact on protein function and/or cancer risk.
Mayo Clinic Laboratories, Mayo Clinic	RCV001701093	SCV004226067	uncertain significance	not provided	2022-03-21	criteria provided, single submitter	clinical testing	PP3
All of Us Research Program, National Institutes of Health	RCV004001022	SCV004843193	uncertain significance	Lynch syndrome	2023-10-02	criteria provided, single submitter	clinical testing	This missense variant replaces tyrosine with cysteine at codon 561 of the MLH1 protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has not been reported in individuals affected with MLH1-related disorders in the literature. This variant has been identified in 1/31396 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance.
Baylor Genetics	RCV000662503	SCV005057974	uncertain significance	Colorectal cancer, hereditary nonpolyposis, type 2	2024-02-22	criteria provided, single submitter	clinical testing
Clinical Genetics, Academic Medical Center	RCV001701093	SCV001919305	uncertain significance	not provided		no assertion criteria provided	clinical testing
Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	RCV001701093	SCV001954484	uncertain significance	not provided		no assertion criteria provided	clinical testing