TRPV4 mutations in children with congenital distal spinal muscular atrophy

Chiara Fiorillo, Francesca Moro, Giacomo Brisca, Guja Astrea, Claudia Nesti, Zoltán Bálint, Andrea Olschewski, Maria Chiara Meschini, Christian Guelly, Michaela Auer-Grumbach, Roberta Battini, Marina Pedemonte, Alessandro Romano, Valeria Menchise, Roberta Biancheri, Filippo M. Santorelli, Claudio Bruno

Research output: Contribution to journalArticlepeer-review

Abstract

Inherited disorders characterized by motor neuron loss and muscle weakness are genetically heterogeneous. The recent identification of mutations in the gene encoding transient receptor potential vanilloid 4 (TRPV4) in distal spinal muscular atrophy (dSMA) prompted us to screen for TRPV4 mutations in a small group of children with compatible phenotype. In a girl with dSMA and vocal cord paralysis, we detected a new variant (p.P97R) localized in the cytosolic N-terminus of the TRPV4 protein, upstream of the ankyrin-repeat domain, where the great majority of disease-associated mutations reside. In another child with congenital dSMA, in this case associated with bone abnormalities, we detected a previously reported mutation (p.R232C). Functional analysis of the novel p.P97R mutation in a heterologous system demonstrated a loss-of-function mechanism. Protein localization studies in muscle, skin, and cultured skin fibroblasts from both patients showed normal protein expression. No TRPV4 mutations were detected in four children with dSMA without bone or vocal cord involvement. Adding to the clinical and molecular heterogeneity of TRPV4-associated diseases, our results suggest that molecular testing of the TRPV4 gene is warranted in cases of congenital dSMA with bone abnormalities and vocal cord paralysis.

Original languageEnglish
Pages (from-to)195-203
Number of pages9
JournalNeurogenetics
Volume13
Issue number3
DOIs
Publication statusPublished - Aug 2012

Keywords

  • Distal SMA
  • Genotype-phenotype correlations
  • Mutation
  • TRPV4
  • Vocal cord

ASJC Scopus subject areas

  • Genetics(clinical)
  • Cellular and Molecular Neuroscience
  • Genetics

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