Molecular evolution of the junctophilin gene family

Alejandro Garbino, Ralph J. Van Oort, Sayali S. Dixit, Andrew P. Landstrom, Michael J. Ackerman, Xander H.T. Wehrens

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Junctophilins (JPHs) are members of a junctional membrane complex protein family important for the physical approximation of plasmalemmal and sarcoplasmic/endoplasmic reticulum membranes. As such, JPHs facilitate signal transduction in excitable cells between plasmalemmal voltage-gated calcium channels and intracellular calcium release channels. To determine the molecular evolution of the JPH gene family, we performed a phylogenetic analysis of over 60 JPH genes from over 40 species and compared conservation across species and different isoforms. We found that JPHs are evolutionary highly conserved, in particular the membrane occupation and recognition nexus motifs found in all species. Our data suggest that an ancestral form of JPH arose at the latest in a common metazoan ancestor and that in vertebrates four isoforms arose, probably following two rounds of whole genome duplications. By combining multiple prediction techniques with sequence alignments, we also postulate the presence of new important functional regions and candidate sites for posttranslational modifications. The increasing number of available sequences yields significant insight into the molecular evolution of JPHs. Our analysis is consistent with the emerging concept that JPHs serve dual important functions in excitable cells: structural assembly of junctional membrane complexes and regulation of intracellular calcium signaling pathways.

Original languageEnglish (US)
Pages (from-to)175-186
Number of pages12
JournalPhysiological Genomics
Volume37
Issue number3
DOIs
StatePublished - May 2009

Keywords

  • Calcium signaling
  • Excitable cells
  • Excitation-contraction coupling
  • Junctional membrane complex
  • MORN motif

ASJC Scopus subject areas

  • Physiology
  • Genetics

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