Submissions for variant NM_000166.6(GJB1):c.536G>A (p.Cys179Tyr) (rs116840822)

Total submissions: 3

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
GeneDx	RCV000220506	SCV000279582	likely pathogenic	not provided	2016-01-21	criteria provided, single submitter	clinical testing	The C179Y variant in the GJB1 gene has been reported previously in association with Charcot-Marie-Tooth type X1 disease (CMTX1) (Casasnovas et al., 2006). The C179Y 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 C179Y 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 conserved across species. Different missense variants in the same codon (C179G/R) as well as multiple missense variants in nearby residues have been reported in the Human Gene Mutation Database in association with GJB1-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. In silico analysis predicts this variant is probably damaging to the protein structure/function. This variant is likely pathogenic; however, the possibility that it is benign cannot be excluded.
GeneReviews	RCV000020175	SCV000040506	pathologic	X-linked hereditary motor and sensory neuropathy	2010-04-15	no assertion criteria provided	curation	Converted during submission to Pathogenic.
Inherited Neuropathy Consortium	RCV000789199	SCV000928551	uncertain significance	Charcot-Marie-Tooth disease		no assertion criteria provided	literature only