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Science 7 July 2006:
Vol. 313. no. 5783, p. 13
DOI: 10.1126/science.313.5783.13f
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Drosophila melanogaster sports a set of forewings and a small pair of serially homologous structures, termed halteres, that help provide balance during flight. Crickmore and Mann (p. 63, published online 1 June; see the Perspective by Stern) used genetic analyses to examine the variation in size control between the wing and haltere during development. Ultrabithorax (Ubx), a homeotic selector gene, controls the size of the haltere primordium and, subsequently, the haltere itself, by restricting the expression and mobility of the morphogen, Decapentaplegic (Dpp), via the Dpp receptor, thickveins. Thus, selector genes can regulate organ size by regulating both growth factors and their receptors.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)