ClinVar Miner

Submissions for variant NM_172250.3(MMAA):c.587G>A (p.Arg196Gln)

gnomAD frequency: 0.00003  dbSNP: rs144389160
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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
University Children's Hospital, University of Zurich RCV000509041 SCV000606800 uncertain significance Methylmalonic aciduria, cblA type criteria provided, single submitter clinical testing Found in combination with mutation NM_172250.2:c.733+1G>A in same allele
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV003235259 SCV003934230 uncertain significance not specified 2023-05-25 criteria provided, single submitter clinical testing Variant summary: MMAA c.587G>A (p.Arg196Gln) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 2.4e-05 in 251378 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.587G>A has been reported in the literature in an individual affected with Methylmalonic Acidemia, however this individual also had a pathogenic second allele in cis and was homozygous for this genotype (example: Plessl_2017). This report does not provide unequivocal conclusions about association of the variant with Methylmalonic Acidemia. At least one publication reports experimental evidence evaluating an impact on protein function, and demonstrated that the variant protein had normal intrinsic GTPase activity but reduced Catalytic Efficiency (example: Plessl_2017). The following publication has been ascertained in the context of this evaluation (PMID: 28497574). No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance.

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