A Calcium Wave Mediated by Gap Junctions Coordinates a Rhythmic Behavior in C. elegans

Maureen A. Peters, Takayuki Teramoto, Jamie Q. White, Kouichi Iwasaki, Erik M. Jorgensen

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Intercellular calcium waves can be observed in adult tissues, but whether they are instructive, permissive, or even required for behavior is predominantly unknown. In the nematode Caenorhabditis elegans, a periodic calcium spike in a pacemaker cell initiates a calcium wave in the intestine [1, 2]. The calcium wave is followed by three muscle contractions that comprise the defecation motor program [1]. Normal wave propagation requires the pannexin gap-junction subunit INX-16 at the interfaces of the intestinal cells. In the absence of this gap-junction subunit, calcium waves are frequently absent. The remaining waves are slow, initiate at abnormal locations, or travel in the opposite direction. Abnormal waves are associated with parallel effects in the first step of the motor program: The contractions of the overlying muscles fail to propagate beyond the pacemaker cell, are slow, initiate in abnormal locations, or are reversed. Moreover, the last two motor steps are predominantly absent. Finally, the absence of this gap-junction subunit also affects the reliability of the pacemaker cell; cycle timing is often irregular. These data demonstrate that pannexin gap junctions propagate calcium waves in the C. elegans intestine. The calcium waves instruct the motor steps and regulate the pacemaker cell's authority and reliability.

Original languageEnglish
Pages (from-to)1601-1608
Number of pages8
JournalCurrent Biology
Volume17
Issue number18
DOIs
Publication statusPublished - Sep 18 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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