ClinVar Miner

Submissions for variant NM_000249.4(MLH1):c.545G>A (p.Arg182Lys)

dbSNP: rs587779021
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
International Society for Gastrointestinal Hereditary Tumours (InSiGHT) RCV000075753 SCV000106761 pathogenic Lynch syndrome 2013-09-05 reviewed by expert panel research Variant causes splicing aberration leading to truncated protein: full inactivation of variant allele
Invitae RCV001854303 SCV002130604 uncertain significance Hereditary nonpolyposis colorectal neoplasms 2021-06-20 criteria provided, single submitter clinical testing This variant has been observed in individual(s) with colorectal cancer (PMID: 14635101). ClinVar contains an entry for this variant (Variation ID: 90264). This variant is not present in population databases (ExAC no frequency). This sequence change replaces arginine with lysine at codon 182 of the MLH1 protein (p.Arg182Lys). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and lysine. This variant also falls at the last nucleotide of exon 6, which is part of the consensus splice site for this exon. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. Nucleotide substitutions within the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant is associated with altered splicing, but the impact on the resulting protein product is unknown (PMID: 26247049). 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.
Myriad Genetics, Inc. RCV003452745 SCV004185683 likely pathogenic Colorectal cancer, hereditary nonpolyposis, type 2 2023-07-14 criteria provided, single submitter clinical testing This variant is considered likely pathogenic. mRNA analysis has demonstrated abnormal mRNA splicing occurs [PMID: 26247049, Myriad internal data].

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