Consequences of the Last Glacial Period on the Genetic Diversity of Southeast Asians

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Branco, Catarina and Kanellou, Marina and González Martín, Antonio and Arenas, Miguel (2022) Consequences of the Last Glacial Period on the Genetic Diversity of Southeast Asians. Genes, 13 (2). pp. 1-12. ISSN Electronic: 2073-4425

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Official URL: https://doi.org/10.3390/genes13020384




Abstract

The last glacial period (LGP) promoted a loss of genetic diversity in Paleolithic populations of modern humans from diverse regions of the world by range contractions and habitat fragmentation. However, this period also provided some currently submersed lands, such as the Sunda shelf in Southeast Asia (SEA), that could have favored the expansion of our species. Concerning the latter, still little is known about the influence of the lowering sea level on the genetic diversity of current SEA populations. Here, we applied approximate Bayesian computation, based on extensive spatially explicit computer simulations, to evaluate the fitting of mtDNA data from diverse SEA populations with alternative evolutionary scenarios that consider and ignore the LGP and migration through long-distance dispersal (LDD). We found that both the LGP and migration through LDD should be taken into consideration to explain the currently observed genetic diversity in these populations and supported a rapid expansion of first populations throughout SEA. We also found that temporarily available lands caused by the low sea level of the LGP provided additional resources and migration corridors that favored genetic diversity. We conclude that migration through LDD and temporarily available lands during the LGP should be considered to properly understand and model the first expansions of modern humans.


Item Type:Article
Uncontrolled Keywords:Modern human evolution; Population genetics; Last glacial period; Long-distance dispersal; Southeast Asians
Subjects:Medical sciences > Biology > Evolution
Medical sciences > Biology > Genetics
ID Code:73951
Deposited On:20 Jul 2022 08:19
Last Modified:03 Aug 2022 07:51

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