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Submitted on December 6, 2004
Accepted on April 6, 2005
Parallel Patterns of Evolution in the Genomes and Transcriptomes of Humans and Chimpanzees
Philipp Khaitovich 1, Ines Hellmann 1, Wolfgang Enard 1, Katja Nowick 1, Marcus Leinweber 1, Henriette Franz 1, Gunter Weiss 2, Michael Lachmann 1, Svante Pääbo 1*
1 Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, D-04103 Leipzig, Germany. 2 WE Informatik, Bioinformatik, University of Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany.
* To whom correspondence should be addressed.
Svante Pääbo , E-mail: paabo{at}eva.mpg.de
The determination of the chimpanzee genome sequence providesa new means to study both structural and functional aspectsof the evolution of the human genome. Here we compare humansand chimpanzees with respect to differences in expression levelsand protein-coding sequences for genes active in brain, heart,liver, kidney, and testis. We find that the patterns of differencesin gene expression and gene sequences are remarkably similar.In particular, there is a gradation of selective constraintsamong the tissues so that the brain shows the least differencesbetween the species while liver shows the most. Furthermore,expression levels as well as amino acid sequences of genes activein more tissues have diverged less between the species thangenes active in fewer tissues. In general, these patterns areconsistent with a model of neutral evolution with negative selection.However, for X-chromosomal genes expressed in testis, patternssuggestive of positive selection on sequence changes as wellas expression changes are seen. Furthermore, although genesexpressed in the brain have changed less than genes expressedin other tissues, in agreement with previous work we find thatgenes active in brain have accumulated more changes on the humanthan the chimpanzee lineage.
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