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Variations in the sequences of BMP2 imply different mechanisms for the evolution of morphological diversity in vertebrates.

Comp. Biochem. Physiol. Part D Genomics Proteomics. 2009 Jun;4(2):100-4. Epub 2008 Dec 13
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摘要


Bone morphogenetic protein 2 (BMP2) plays an important role in skeletogenesis, osteoblastic differentiation and limb patterning. Its protein coding region consists of the signal peptide, the pro-domain (that regulates post-translational control of synthesis) and the mature domain (that carries out gene function). This gene has been considered previously to be conserved. By re-analyzing the coding region of BMP2 in 31 species of vertebrates, we found that the mature domain region is indeed conserved in mammals, but not among non-mammalian taxa. Moreover, compared to the mature domain, the signal peptide and pro-domain have experienced dramatic variation in all vertebrates. Six amino acid sites in the pro-domain were identified to be under diversifying Darwinian selection in mammals. These results indicate that the signal peptide and pro-domain of BMP2 may be involved in skeletal poly-morphology during mammal evolution and the mature domain may also contribute to this function in non-mammals. This supports the hypothesis that morphological variations in mammals result mainly from a change in post-translational control of synthesis, whereas in non-mammals they result mainly from gene functional change.

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