ClinVar Miner

Submissions for variant NM_021625.4(TRPV4):c.946C>T (p.Arg316Cys) (rs267607145)

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Total submissions: 8
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000236285 SCV000293082 pathogenic not provided 2017-04-16 criteria provided, single submitter clinical testing The R316C variant in the TRPV4 gene has been reported previously in families with scapuloperoneal spinal muscular atrophy, childhood-onset distal hereditary motor neuropathy, and vocal fold paresis (Echaniz-Laguna et al., 2014; Deng et al., 2010). Additionally, studies in HEK293 and HeLa cells with the R316C variant show that this variant impacts the function of the protein (Fecto et al., 2011; Deng et al., 2010). The R316C variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R316C 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. Additionally, this substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. Furthermore, missense variants at the same codon and in nearby residues (R316H, R315W) have been reported in the Human Gene Mutation Database in association with (scapuloperoneal spinal muscular atrophy (Stenson et al., 2014), supporting the functional importance of this region of the protein. Therefore, we interpret R316C as a pathogenic variant.
Invitae RCV000005294 SCV000767288 pathogenic Charcot-Marie-Tooth disease axonal type 2C 2019-10-01 criteria provided, single submitter clinical testing This sequence change replaces arginine with cysteine at codon 316 of the TRPV4 protein (p.Arg316Cys). The arginine residue is moderately conserved and there is a large physicochemical difference between arginine and cysteine. This variant is not present in population databases (rs267607145, ExAC no frequency). This variant has been reported to segregate with Scapuloperoneal spinal muscular atrophy (SPSMA) and hereditary motor and sensory neuropathy 2C (HMSN2C) in multiple families (PMID: 20037587, 20037588, 24789864). This variant has also been shown to arise de novo in an individual affected with distal hereditary motor neuropathy (dHMN) (PMID: 24789864). ClinVar contains an entry for this variant (Variation ID: 5001). Experimental studies have shown that this missense change alters the function of TRPV4 channels and results in substantially higher basal calcium levels (PMID: 20037587, 21454511). A different missense substitution at this codon (p.Arg316His) has been determined to be pathogenic (PMID: 21288981, 24789864, 24319099). This suggests that the arginine residue is critical for TRPV4 protein function and that other missense substitutions at this position may also be pathogenic. For these reasons, this variant has been classified as Pathogenic.
Molecular Genetics Laboratory,London Health Sciences Centre RCV000192245 SCV001335962 pathogenic Charcot-Marie-Tooth disease criteria provided, single submitter clinical testing
OMIM RCV000005294 SCV000025472 pathogenic Charcot-Marie-Tooth disease axonal type 2C 2010-02-01 no assertion criteria provided literature only
OMIM RCV000005295 SCV000025473 pathogenic Scapuloperoneal spinal muscular atrophy 2010-02-01 no assertion criteria provided literature only
GeneReviews RCV000202561 SCV000148065 pathogenic Neuromuscular disease 2014-04-02 no assertion criteria provided literature only
GeneReviews RCV000192245 SCV000239893 pathogenic Charcot-Marie-Tooth disease 2015-04-30 no assertion criteria provided literature only
Inherited Neuropathy Consortium RCV000789587 SCV000928943 uncertain significance Autosomal dominant distal hereditary motor neuropathy no assertion criteria provided literature only

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