"Adão", antigo chimpanzé, viveu há mais de 1 milhão de anos atrás

sexta-feira, fevereiro 26, 2016

Great-ape Y Chromosome and mitochondrial DNA phylogenies reflect subspecies structure and patterns of mating and dispersal

Pille Hallast 1,2, Pierpaolo Maisano Delser 1,6, Chiara Batini 1, Daniel Zadik 1, Mariano Rocchi 3, Werner Schempp 4, Chris Tyler-Smith 5 and Mark A. Jobling 1

- Author Affiliations

1Department of Genetics, University of Leicester, Leicester LE1 7RH, United Kingdom;

2Institute of Molecular and Cell Biology, University of Tartu, Tartu 51010, Estonia;

3Department of Biology, University of Bari, 70124 Bari, Italy;

4Institute of Human Genetics, University of Freiburg, 79106 Freiburg, Germany;

5Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom

- Author Notes

↵6 Present address: Ecole Pratique des Hautes Etudes (EPHE) - Musée National d'Histoire Naturelle, 75005 Paris, France

Corresponding author: maj4@le.ac.uk


The distribution of genetic diversity in great-ape species is likely to have been affected by patterns of dispersal and mating. This has previously been investigated by sequencing autosomal and mitochondrial DNA (mtDNA), but large-scale sequence analysis of the male-specific region of the Y Chromosome (MSY) has not yet been undertaken. Here, we use the human MSY reference sequence as a basis for sequence capture and read mapping in 19 great-ape males, combining the data with sequences extracted from the published whole genomes of 24 additional males to yield a total sample of 19 chimpanzees, four bonobos, 14 gorillas, and six orangutans, in which interpretable MSY sequence ranges from 2.61 to 3.80 Mb. This analysis reveals thousands of novel MSY variants and defines unbiased phylogenies. We compare these with mtDNA-based trees in the same individuals, estimating time-to-most-recent common ancestor (TMRCA) for key nodes in both cases. The two loci show high topological concordance and are consistent with accepted (sub)species definitions, but time depths differ enormously between loci and (sub)species, likely reflecting different dispersal and mating patterns. Gorillas and chimpanzees/bonobos present generally low and high MSY diversity, respectively, reflecting polygyny versus multimale–multifemale mating. However, particularly marked differences exist among chimpanzee subspecies: The western chimpanzee MSY phylogeny has a TMRCA of only 13.2 (10.8–15.8) thousand years, but that for central chimpanzees exceeds 1 million years. Cross-species comparison within a single MSY phylogeny emphasizes the low human diversity, and reveals species-specific branch length variation that may reflect differences in long-term generation times.


[Supplemental material is available for this article.]

Article published online before print. Article, supplemental material, and publication date are at http://www.genome.org/cgi/doi/10.1101/gr.198754.115.

Freely available online through the Genome Research Open Access option.

Received August 26, 2015. Accepted January 25, 2016.

© 2016 Hallast et al.; Published by Cold Spring Harbor Laboratory Press

This article, published in Genome Research, is available under a Creative Commons License (Attribution 4.0 International), as described at http://creativecommons.org/licenses/by/4.0/.

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