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Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage

Hailer, Frank; Kutschera, Verena E.; Hallstroem, Bjoern M.; Klassert, Denise; Fain, Steven R.; Leonard, Jennifer A.; Arnason, Ulfur LU and Janke, Axel (2012) In Science 336(6079). p.344-347
Abstract
Recent studies have shown that the polar bear matriline (mitochondrial DNA) evolved from a brown bear lineage since the late Pleistocene, potentially indicating rapid speciation and adaption to arctic conditions. Here, we present a high-resolution data set from multiple independent loci across the nuclear genomes of a broad sample of polar, brown, and black bears. Bayesian coalescent analyses place polar bears outside the brown bear clade and date the divergence much earlier, in the middle Pleistocene, about 600 (338 to 934) thousand years ago. This provides more time for polar bear evolution and confirms previous suggestions that polar bears carry introgressed brown bear mitochondrial DNA due to past hybridization. Our results highlight... (More)
Recent studies have shown that the polar bear matriline (mitochondrial DNA) evolved from a brown bear lineage since the late Pleistocene, potentially indicating rapid speciation and adaption to arctic conditions. Here, we present a high-resolution data set from multiple independent loci across the nuclear genomes of a broad sample of polar, brown, and black bears. Bayesian coalescent analyses place polar bears outside the brown bear clade and date the divergence much earlier, in the middle Pleistocene, about 600 (338 to 934) thousand years ago. This provides more time for polar bear evolution and confirms previous suggestions that polar bears carry introgressed brown bear mitochondrial DNA due to past hybridization. Our results highlight that multilocus genomic analyses are crucial for an accurate understanding of evolutionary history. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Science
volume
336
issue
6079
pages
344 - 347
publisher
The American Association for the Advancement of Science
external identifiers
  • wos:000302995400045
  • scopus:84859994581
ISSN
1095-9203
DOI
10.1126/science.1216424
language
English
LU publication?
yes
id
526c5c2b-5a40-479d-aceb-997abb603310 (old id 2571564)
date added to LUP
2012-06-04 11:36:21
date last changed
2017-11-05 03:59:11
@article{526c5c2b-5a40-479d-aceb-997abb603310,
  abstract     = {Recent studies have shown that the polar bear matriline (mitochondrial DNA) evolved from a brown bear lineage since the late Pleistocene, potentially indicating rapid speciation and adaption to arctic conditions. Here, we present a high-resolution data set from multiple independent loci across the nuclear genomes of a broad sample of polar, brown, and black bears. Bayesian coalescent analyses place polar bears outside the brown bear clade and date the divergence much earlier, in the middle Pleistocene, about 600 (338 to 934) thousand years ago. This provides more time for polar bear evolution and confirms previous suggestions that polar bears carry introgressed brown bear mitochondrial DNA due to past hybridization. Our results highlight that multilocus genomic analyses are crucial for an accurate understanding of evolutionary history.},
  author       = {Hailer, Frank and Kutschera, Verena E. and Hallstroem, Bjoern M. and Klassert, Denise and Fain, Steven R. and Leonard, Jennifer A. and Arnason, Ulfur and Janke, Axel},
  issn         = {1095-9203},
  language     = {eng},
  number       = {6079},
  pages        = {344--347},
  publisher    = {The American Association for the Advancement of Science},
  series       = {Science},
  title        = {Nuclear Genomic Sequences Reveal that Polar Bears Are an Old and Distinct Bear Lineage},
  url          = {http://dx.doi.org/10.1126/science.1216424},
  volume       = {336},
  year         = {2012},
}