Dataset Information

Inland post-glacial dispersal in East Asia revealed by mitochondrial haplogroup M9a'b.

ABSTRACT: BACKGROUND: Archaeological studies have revealed a series of cultural changes around the Last Glacial Maximum in East Asia; whether these changes left any signatures in the gene pool of East Asians remains poorly indicated. To achieve deeper insights into the demographic history of modern humans in East Asia around the Last Glacial Maximum, we extensively analyzed mitochondrial DNA haplogroup M9a'b, a specific haplogroup that was suggested to have some potential for tracing the migration around the Last Glacial Maximum in East Eurasia. RESULTS: A total of 837 M9a'b mitochondrial DNAs (583 from the literature, while the remaining 254 were newly collected in this study) pinpointed from over 28,000 subjects residing across East Eurasia were studied here. Fifty-nine representative samples were further selected for total mitochondrial DNA sequencing so we could better understand the phylogeny within M9a'b. Based on the updated phylogeny, an extensive phylogeographic analysis was carried out to reveal the differentiation of haplogroup M9a'b and to reconstruct the dispersal histories. CONCLUSIONS: Our results indicated that southern China and/or Southeast Asia likely served as the source of some post-Last Glacial Maximum dispersal(s). The detailed dissection of haplogroup M9a'b revealed the existence of an inland dispersal in mainland East Asia during the post-glacial period. It was this dispersal that expanded not only to western China but also to northeast India and the south Himalaya region. A similar phylogeographic distribution pattern was also observed for haplogroup F1c, thus substantiating our proposition. This inland post-glacial dispersal was in agreement with the spread of the Mesolithic culture originating in South China and northern Vietnam.

SUBMITTER: Peng MS

PROVIDER: S-EPMC3027199 | biostudies-literature | 2011

REPOSITORIES: biostudies-literature

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Inland post-glacial dispersal in East Asia revealed by mitochondrial haplogroup M9a'b.

Peng Min-Sheng MS Palanichamy Malliya Gounder MG Yao Yong-Gang YG Mitra Bikash B Cheng Yao-Ting YT Zhao Mian M Liu Jia J Wang Hua-Wei HW Pan Hui H Wang Wen-Zhi WZ Zhang A-Mei AM Zhang Wen W Wang Dong D Zou Yang Y Yang Yang Y Chaudhuri Tapas Kumar TK Kong Qing-Peng QP Zhang Ya-Ping YP

BMC biology 20110110

<h4>Background</h4>Archaeological studies have revealed a series of cultural changes around the Last Glacial Maximum in East Asia; whether these changes left any signatures in the gene pool of East Asians remains poorly indicated. To achieve deeper insights into the demographic history of modern humans in East Asia around the Last Glacial Maximum, we extensively analyzed mitochondrial DNA haplogroup M9a'b, a specific haplogroup that was suggested to have some potential for tracing the migration ...[more]

PMID: 21219640

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Project description:The East Asian-Tethyan disjunction pattern and its mechanisms of formation have long been of interest to researchers. Here, we studied the biogeographical history of Asteraceae tribe Cardueae, with a particular focus on the temperate East Asian genus Atractylodes DC., to understand the role of tectonic and climatic events in driving the diversification and disjunctions of the genus. A total of 76 samples of Atractylodes from 36 locations were collected for RAD-sequencing. Three single nucleotide polymorphism (SNP) datasets based on different filtering strategies were used for phylogenetic analyses. Molecular dating and ancestral distribution reconstruction were performed using both chloroplast DNA sequences (127 Cardueae samples) and SNP (36 Atractylodes samples) datasets. Six species of Atractylodes were well resolved as individually monophyletic, although some introgression was identified among accessions of A. chinensis, A. lancea and A. koreana. Dispersal of the subtribe Carlininae from the Mediterranean to East Asia occurred after divergence between Atractylodes and Carlina L. + Atractylis L. + Thevenotia DC. at ~31.57 Ma, resulting in an East Asian-Tethyan disjunction. Diversification of Atractylodes in East Asia mainly occurred from the Late Miocene to the Early Pleistocene. Aridification of Asia and the closure of the Turgai Strait in the Late Oligocene promoted the dispersal of Cardueae from the Mediterranean to East China. Subsequent uplift of the Qinghai-Tibet Plateau as well as changes in Asian monsoon systems resulted in an East Asian-Tethyan disjunction between Atractylodes and Carlina + Atractylis + Thevenotia. In addition, Late Miocene to Quaternary climates and sea level fluctuations played major roles in the diversification of Atractylodes. Through this study of different taxonomic levels using genomic data, we have revealed an overlooked dispersal route between the Mediterranean and far East Asia (Japan/Korea) via Central Asia and East China.

Dataset Information

Inland post-glacial dispersal in East Asia revealed by mitochondrial haplogroup M9a'b.

Publications

Inland post-glacial dispersal in East Asia revealed by mitochondrial haplogroup M9a'b.

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