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Expression of the C. elegans labial orthologue ceh-13 during male tail morphogenesis.

Dev. Biol.2003 Jul 01;259(1):137-49
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摘要


Hox genes are transcriptional regulators of metazoan body regionalization along the anteroposterior axis that act by specifying positional identity in differentiating cells. ceh-13, the labial orthologue in Caenorhabditis elegans, is expressed both during embryogenesis and post- embryonic development. Using GFP reporter analysis and immunocytochemistry, we discovered a spatiotemporal pattern of gene expression in the male tail during the L3 and L4 larval stages that is TGF-beta pathway-dependent. Analysis of reporter activity in transgenic animals identified a distinct promoter region driving male tail-specific ceh-13 expression. We also report the interspecies conservation of sequence motifs within this region and speculate that, in the course of evolutionary diversification, ceh-13 may have acquired new functionality while conserving its homeotic role.

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