ClinVar Miner

Submissions for variant NM_000315.4(PTH):c.166C>T (p.Arg56Cys)

gnomAD frequency: 0.00001  dbSNP: rs199955107
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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000421942 SCV000516552 likely pathogenic not provided 2016-08-31 criteria provided, single submitter clinical testing The R56C variant in the PTH gene has been reported previously in the homozygous state in three siblings with biochemical findings consistent with hypoparathyroidism, one of whom exhibited clinical features including muscle cramps and seizures (Lee et al., 2015). Functional studies demonstrate that the R56C variant results in decreased binding to the PTH1R receptor (Lee et al., 2015). This variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The R56C variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is not conserved across species. We interpret R56C as a likely pathogenic variant.

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