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Resources » Paper

Kemp BJ et al. (2012) Curr Biol "miR-786 regulation of a fatty-acid elongase contributes to rhythmic calcium-wave initiation in C. elegans."

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  • Comments on Kemp BJ et al. (2012) Curr Biol "miR-786 regulation of a fatty-acid elongase contributes to rhythmic calcium-wave initiation in C. elegans." (0)

  • Overview

    PMID:
    23141108
    DOI:
    10.1016/j.cub.2012.09.047
    Status:
    Publication type:
    Journal_article
    WormBase ID:
    WBPaper00041724

    Kemp BJ, Allman E, Immerman L, Mohnen M, Peters MA, Nehrke K, & Abbott AL (2012). miR-786 regulation of a fatty-acid elongase contributes to rhythmic calcium-wave initiation in C. elegans. Curr Biol, 22, 2213-20. doi:10.1016/j.cub.2012.09.047

    BACKGROUND: Rhythmic behaviors are ubiquitous phenomena in animals. In C. elegans, defecation is an ultradian rhythmic behavior: every 50 s a calcium wave initiating in the posterior intestinal cells triggers the defecation motor program that comprises three sequential muscle contractions. Oscillatory calcium signaling is central to the periodicity of defecation. The posteriormost intestinal cells function as the pacemaker for this rhythmic behavior, although it is unclear how the supremacy of these cells for calcium-wave initiation is controlled. RESULTS: We describe how the loss of the mir-240/786 microRNA cluster, which results in arrhythmic defecation, causes ectopic intestinal calcium-wave initiation. mir-240/786 expression in the intestine is restricted to the posterior cells that function as the defecation pacemaker. Genetic data indicate that mir-240/786 functions upstream of the inositol 1,4,5-trisphosphate (IP(3)) receptor. Through rescue analysis, it was determined that miR-786 functions to regulate defecation. Furthermore, we identified elo-2, a fatty-acid elongase with a known role in defecation cycling, as a direct target for miR-786. We propose that the regulation of palmitate levels through repression of elo-2 activity is the likely mechanistic link to defecation. CONCLUSIONS: Together, these data indicate that miR-786 confers pacemaker status on posterior intestinal cells for the control of calcium-wave initiation through the regulation of elo-2 and, subsequently, palmitate levels. We propose that a difference in fatty-acid composition in the posterior intestinal cells may alter the activities of membrane proteins, such as IP(3)-receptor or TRPM channels, that control pacemaker activity in the C. elegans intestine.


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