ClinVar Miner

Submissions for variant NM_014874.3(MFN2):c.818T>G (p.Val273Gly) (rs1458700065)

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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
GeneDx RCV000519202 SCV000617756 likely pathogenic not provided 2017-07-10 criteria provided, single submitter clinical testing The V273G variant has been previously reported to segregate with disease in multiple affected individuals from a single large family with CMT (Lawson et al., 2005). The V273G variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). This variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. However, this substitution occurs at a conserved position within the dynamin type G domain of the MFN2 protein. Additionally, in silico analysis predicts this variant is probably damaging to the protein structure/function.
Inherited Neuropathy Consortium RCV000789395 SCV000928750 uncertain significance Charcot-Marie-Tooth disease no assertion criteria provided literature only
Invitae RCV000689677 SCV000817340 uncertain significance Charcot-Marie-Tooth disease, type 2 2018-04-23 criteria provided, single submitter clinical testing This sequence change replaces valine with glycine at codon 273 of the MFN2 protein (p.Val273Gly). The valine residue is highly conserved and there is a moderate physicochemical difference between valine and glycine. This variant is not present in population databases (ExAC no frequency). This variant has been reported to segregate with Charcot-Marie-Tooth disease (CMT) in a large family (PMID: 16043786). ClinVar contains an entry for this variant (Variation ID: 449524). Experimental studies have shown that this missense change does not affect mitofusin expression, mitochondrial morphology, ultrastructure, mtDNA content, and respiratory capacity in fibroblasts (PMID: 18316077). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

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