Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
Development. 1998 Feb;125(3):421-9.

Muscle and nerve-specific regulation of a novel NK-2 class homeodomain factor in Caenorhabditis elegans.

Author information

  • 1Carnegie Institution of Washington, Department of Embryology, Baltimore, MD 21210, USA.


We have identified a new Caenorhabditis elegans NK-2 class homeobox gene, designated ceh-24. Distinct cis-acting elements generate a complex neuronal and mesodermal expression pattern. A promoter-proximal enhancer mediates expression in a single pharyngeal muscle, the donut-shaped m8 cell at the posterior end of the pharynx. A second mesodermal enhancer is active in a set of eight nonstriated vulval muscles used in egg laying. Activation in the egg laying muscles requires an 'NdE-box' consensus motif (CATATG) which is related to, but distinct from, the standard E-box motif bound by the MyoD family of transcriptional activators. Ectodermal expression of ceh-24 is limited to a subset of sublateral motor neurons in the head of the animal; this activity requires a cis-acting activator element that is distinct from the control elements for pharyngeal and vulval muscle expression. Activation of ceh-24 in each of the three cell types coincides with the onset of differentiation. Using a set of transposon-induced null mutations, we show that ceh-24 is not essential for the formation of any of these cells. Although ceh-24 mutants have no evident defects under laboratory conditions, the pattern of ceh-24 activity is apparently important for Rhabditid nematodes: the related species C. briggsae contains a close homologue of C. elegans ceh-24 including a highly conserved and functionally equivalent set of cis-acting control signals.

[PubMed - indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire
    Loading ...
    Write to the Help Desk