ClinVar Miner

Submissions for variant NM_000530.8(MPZ):c.419C>G (p.Ser140Cys) (rs863224449)

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Total submissions: 2
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV000198501 SCV000253697 likely pathogenic Charcot-Marie-Tooth disease, type I 2015-03-30 criteria provided, single submitter clinical testing This sequence change replaces serine with cysteine at codon 140 of the MPZ protein (p.Ser140Cys). The serine residue is highly conserved and there is a moderate physicochemical difference between serine and cysteine. This variant has been reported in the literature and is not present in population databases. This variant was reported in an individual affected with Charcot-Marie-Tooth type 1B (CMT1B). This variant was also reported in this individual's son who presented with subclinical symptoms of CMT1B (PMID: 24028194). A similar missense change (p.Ser140Thr) was reported in 4 members of a family affected with Charcot-Marie-Tooth disease (PMID: 12207932). This is region of the MPZ protein is highly conserved among many mammalian species. Codon 140 is located in the extracellular domain and this functional region mediates the adhesive properties of the protein and is critical to myelin function (PMID: 12207932). 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 disruptive, but these predictions have not been confirmed by published functional studies. For these reasons, this variant has been classified as Likely Pathogenic.
Inherited Neuropathy Consortium RCV000789460 SCV000928816 uncertain significance Charcot-Marie-Tooth disease no assertion criteria provided literature only

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