Molecular characterization of an epithelial Ca2+ channel-like gene from crayfish Procambarus clarkii

Yongping Gao, Michele G. Wheatly

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

This study describes the cloning, sequencing and functional characterization of an epithelial Ca2+ channel (ECaC)-like gene isolated from antennal gland (kidney) of the freshwater crayfish Procambarus clarkii. The fulllength cDNA consisted of 2687 bp with an open reading frame of 2169 bp encoding a protein of 722 amino acids with a predicted molecular mass of 81.7 kDa. Crayfish ECaC had 76-78% identity at the mRNA level (80-82% amino acid identity) with published fish sequences and 56-62% identity at the mRNA level (52-60% amino acid identity) with mammalian ECaCs. Secondary structure of the crayfish ECaC closely resembled that of cloned ECaCs. Postmolt ECaC expression was exclusively restricted to epithelia associated with Ca 2+ influx and was virtually undetectable in non-epithelial tissues (eggs, muscle). Compared with expression levels in hepatopancreas, expression in gill was 10-fold greater and expression was highest in antennal gland (15-fold greater than in hepatopancreas). Compared with baseline expression levels in intermolt stage, expression of ECaC in antennal gland increased 7.4- and 23.8-fold, respectively, in pre- and postmolt stages of the molting cycle. This increase was localized primarily in the labyrinth and nephridial canal, regions of the antennal gland associated with renal Ca2+ reabsorption. The ECaC in crayfish appears to be expressed in epithelia associated with unidirectional Ca2+ influx and relative expression is correlated with rate of Ca2+ influx.

Original languageEnglish (US)
Pages (from-to)1813-1824
Number of pages12
JournalJournal of Experimental Biology
Volume210
Issue number10
DOIs
StatePublished - May 1 2007
Externally publishedYes

Keywords

  • Antennal gland
  • Crayfish
  • ECaC
  • Epithelial Ca channel
  • Gill
  • Hepatopancreas
  • Molting cycle
  • Procambarus clarkii
  • mRNA expression and localization

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physiology
  • Aquatic Science
  • Animal Science and Zoology
  • Molecular Biology
  • Insect Science

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