An ion channel of the degenerin/epithelial sodium channel superfamily controls the defecation rhythm in Caenorhabditis elegans

Masaya Take-Uchi, Minoru Kawakami, Takeshi Ishihara, Tosikazu Amano, Kazunori Kondo, Isao Katsura

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Ultradian rhythms are widespread phenomena found in various biological organisms. A typical example is the defecation behavior of the nematode Caenorhabditis elegans, which repeats at about 45-sec intervals. To elucidate the mechanism, we studied flr-1 mutants, which show very short defecation cycle periods. The mutations also affect some food-related functions, including growth rate, the expulsion step of defecation behavior, and the regulation of the dauer larva (a nonfeeding, special third-stage larva) formation in the unc-3 (Olf-1/EBF homolog) background. The fir-1 gene encodes a novel ion channel belonging to the DEG/ENaC (C. elegans degenerin and mammalian epithelial sodium channel) superfamily. A fir-I::GFP (green fluorescent protein) fusion gene that can rescue the flr-1 mutant phenotypes is expressed only in the intestine from embryos to adults. These results suggest that FLR-1 may be a component of an intestinal regulatory system that controls the defecation rhythm as well as other functions.

Original languageEnglish
Pages (from-to)11775-11780
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number20
DOIs
Publication statusPublished - Sep 29 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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