Homeotic evidence for the appendicular origin of the labrum in Tribolium castaneum
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- PMID: 11455420
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Homeotic evidence for the appendicular origin of the labrum in Tribolium castaneum
Dev Genes Evol.
2001 Feb.
Abstract
The ontogeny of the insect labrum, or upper lip, has been debated for nearly a century. Recent molecular data suggest a segmental appendage origin of this structure. Here we report the first arthropod mutation associated with a homeotic transformation of the labrum. Antennagalea-5 (Ag(5)) transforms both antennal and labral structures to resemble those of gnathal appendages in Tribolium castaneum. This labral transformation suggests that the labrum is a fused structure composed of two pairs of appendage endites, and is serially homologous to the gnathal appendages.
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