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First published online March 7, 2005

Development 132, 701e (2005)
© The Company of Biologists Limited
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In this issue

Diversify to evolve


During evolution, new gene functions are created by the duplication and functional diversification of existing genes. Diversification can be at the level of transcriptional regulation or protein function. Kirik and co-workers now describe how for two paralogous MYB-related transcription factors – MYB23 and GL1 – functional diversification at both levels is involved in the development of branching hair-like structures on Arabidopsis leaves called trichomes (see p. 1477). Their study of trichomes in myb23 and gl1 single and double mutants reveals that MYB23 controls trichome branching and trichome initiation at leaf edges, the latter redundantly with GL1. Promoter and protein-coding-region swap experiments indicate that, for trichome initiation, the diversification of gl1 and myb23 gene functions is determined only by how their expression is regulated. By contrast, the diversification of their functions with respect to trichome branching involves differences both in the regulation of the two genes and in the proteins they encode.


Related articles in Development:

Functional diversification of MYB23 and GL1 genes in trichome morphogenesis and initiation
Victor Kirik, Myeong Min Lee, Katja Wester, Ullrich Herrmann, Zhengui Zheng, David Oppenheimer, John Schiefelbein, and Martin Hulskamp
Development 2005 132: 1477-1485. [Abstract] [Full Text]  




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