The impact of genetic adaptation on chimpanzee subspecies differentiation


Autoři: Joshua M. Schmidt aff001;  Marc de Manuel aff003;  Tomas Marques-Bonet aff003;  Sergi Castellano aff002;  Aida M. Andrés aff001
Působiště autorů: UCL Genetics Institute, Department of Genetics, Evolution and Environment, University College London, London, United Kingdom aff001;  Max Planck Institute for Evolutionary Anthropology, Department of Evolutionary Genetics, Leipzig, Germany aff002;  Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas–Universitat Pompeu Fabra), Barcelona, Spain aff003;  National Centre for Genomic Analysis–Centre for Genomic Regulation, Barcelona Institute of Science and Technology, Barcelona, Spain aff004;  Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain aff005;  Genetics and Genomic Medicine Programme, Great Ormond Street Institute of Child Health, University College London (UCL), London, United Kingdom aff006;  UCL Genomics, London, United Kingdom aff007
Vyšlo v časopise: The impact of genetic adaptation on chimpanzee subspecies differentiation. PLoS Genet 15(11): e32767. doi:10.1371/journal.pgen.1008485
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008485

Souhrn

Chimpanzees, humans’ closest relatives, are in danger of extinction. Aside from direct human impacts such as hunting and habitat destruction, a key threat is transmissible disease. As humans continue to encroach upon their habitats, which shrink in size and grow in density, the risk of inter-population and cross-species viral transmission increases, a point dramatically made in the reverse with the global HIV/AIDS pandemic. Inhabiting central Africa, the four subspecies of chimpanzees differ in demographic history and geographical range, and are likely differentially adapted to their particular local environments. To quantitatively explore s genetic adaptation, we investigated the genic enrichment for SNPs highly differentiated between chimpanzee subspecies. Previous analyses of such patterns in human populations exhibited limited evidence of adaptation. In contrast, chimpanzees show evidence of recent positive selection, with differences among subspecies. Specifically, we observe strong evidence of recent selection in eastern chimpanzees, with highly differentiated SNPs being uniquely enriched in genic sites in a way that is expected under recent adaptation but not under neutral evolution or background selection. These sites are enriched for genes involved in immune responses to pathogens, and for genes inferred to differentiate the immune response to infection by simian immunodeficiency virus (SIV) in natural vs. non-natural host species. Conversely, central chimpanzees exhibit an enrichment of signatures of positive selection only at cytokine receptors, due to selective sweeps in CCR3, CCR9 and CXCR6 –paralogs of CCR5 and CXCR4, the two major receptors utilized by HIV to enter human cells. Thus, our results suggest that positive selection has contributed to the genetic and phenotypic differentiation of chimpanzee subspecies, and that viruses likely play a predominate role in this differentiation, with SIV being a likely selective agent. Interestingly, our results suggest that SIV has elicited distinctive adaptive responses in these two chimpanzee subspecies.

Klíčová slova:

Human genomics – Chimpanzees – Immune response – Macaque – Monkeys – Natural selection – SIV – Virus effects on host gene expression


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