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Science 11 April 2003:
Vol. 300. no. 5617, pp. 321 - 324
DOI: 10.1126/science.1080600
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Reports

Chromosomal Speciation and Molecular Divergence--Accelerated Evolution in Rearranged Chromosomes

Arcadi Navarro,1* Nick H. Barton2

Humans and their closest evolutionary relatives, the chimpanzees, differ in ~1.24% of their genomic DNA sequences. The fraction of these changes accumulated during the speciation processes that have separated the two lineages may be of special relevance in understanding the basis of their differences. We analyzed human and chimpanzee sequence data to search for the patterns of divergence and polymorphism predicted by a theoretical model of speciation. According to the model, positively selected changes should accumulate in chromosomes that present fixed structural differences, such as inversions, between the two species. Protein evolution was more than 2.2 times faster in chromosomes that had undergone structural rearrangements compared with colinear chromosomes. Also, nucleotide variability is slightly lower in rearranged chromosomes. These patterns of divergence and polymorphism may be, at least in part, the molecular footprint of speciation events in the human and chimpanzee lineages.

1 Departament de Ciències Experimentals i de la Salut, Universitat Pompeu Fabra, Doctor Aiguader 80, 08003 Barcelona, Catalonia, Spain.
2 Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, Scotland, UK.
*   To whom all correspondence should be addressed. E-mail: arcadi.navarro{at}cexs.upf.es

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