MBE Advance Access published online on June 5, 2006
Molecular Biology and Evolution, doi:10.1093/molbev/msl028
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1 Anthropology Department, Temple University, Philadelphia PA; Current address: Department of Human Genetics, Children's Hospital, University of Pennsylvania, Philadelphia, PA
* To whom correspondence should be addressed. To investigate the paternal population history of populations in Northern Island Melanesia, 685 paternally unrelated males from 36 populations in this region and New Guinea were analyzed at 14 regionally informative binary markers and seven short-tandem-repeat loci from the non-recombining portion of the Y chromosome. Three newly defined binary markers (K6-P79, K7-P117, and M2-P87) aided in identifying considerable heterozygosity that would have otherwise gone undetected. Judging from their geographic distributions and network analyses of their associated short-tandem-repeat profiles, four lineages appear to have developed in this region and to be of considerable age: K6-P79, K7-P117, M2-P87, and M2a-P22. The origins of K5-M230 and M-M4 are also confirmed as being located further west, probably in New Guinea. In the 25 adequately sampled populations, the number of different haplogroups ranged from two in the single most isolated group (the Aita of Bougainville), to nine, and measures of molecular diversity were generally not particularly low. The resulting pattern contradicts earlier findings that suggested far lower male-mediated diversity and gene exchange rates in the region. However, these earlier studies had not included the newly defined haplogroups. We could only identify a very weak signal of recent male Southeast Asian genetic influence (<10%), which was almost entirely restricted to Austronesian (Oceanic) speaking groups. This contradicts earlier assumptions on the ancestral composition of these groups and requires a revision of hypotheses concerning the settlement of the islands of the central Pacific, which commenced from this region.
Accepted May 26, 2006
Research Article
Unexpected NRY chromosome variation in Northern Island Melanesia
Laura Scheinfeldt 1 *,
Françoise Friedlaender 2,
Jonathan Friedlaender 2,
Krista Latham 2,
George Koki 3,
Tatyana Karafet 4,
Michael Hammer 4,
and
Joseph Lorenz 5
2 Anthropology Department, Temple University, Philadelphia PA
3 Papua New Guinea Institute for Medical Research, Goroka, Papua New Guinea
4 Division of Biotechnology, University of Arizona
5 Coriell Institute for Medical Research, Camden, NJ; Anthropology Department, Temple University, Philadelphia PA
Laura Scheinfeldt, E-mail: scheinfeld{at}email.chop.edu
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