Journal
SCIENCE
Volume 305, Issue 5689, Pages 1462-1465Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1098095
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- NIDDK NIH HHS [P01 DK56246] Funding Source: Medline
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Darwin's finches are a classic example of species diversification by natural selection. Their impressive variation in beak morphology is associated with the exploitation of a variety of ecological niches, but its developmental basis is unknown. We performed a comparative analysis of expression patterns of various growth factors in species comprising the genus Geospiza. We found that expression of Bmp4 in the mesenchyme of the upper beaks strongly correlated with deep and broad beak morphology. When misexpressed in chicken embryos, Bmp4 caused morphological transformations paralleling the beak morphology of the large ground finch G. magnirostris.
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