indian ocean politics and societies
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Rescooped by Elvin Murday Linganaden from Indian Ocean Archaeology
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Indian ocean crossroads: Human genetic origin and population structure in the maldives - Pijpe et al.

Indian ocean crossroads: Human genetic origin and population structure in the maldives - Pijpe et al. | indian ocean politics and societies | Scoop.it

The Maldives are an 850 km-long string of atolls located centrally in the northern Indian Ocean basin. Because of this geographic situation, the present-day Maldivian population has potential for uncovering genetic signatures of historic migration events in the region. We therefore studied autosomal DNA-, mitochondrial DNA-, and Y-chromosomal DNA markers in a representative sample of 141 unrelated Maldivians, with 119 from six major settlements. We found a total of 63 different mtDNA haplotypes that could be allocated to 29 mtDNA haplogroups, mostly within the M, R, and U clades. We found 66 different Y-STR haplotypes in 10 Y-chromosome haplogroups, predominantly H1, J2, L, R1a1a, and R2. Parental admixture analysis for mtDNA- and Y-haplogroup data indicates a strong genetic link between the Maldive Islands and mainland South Asia, and excludes significant gene flow from Southeast Asia. Paternal admixture from West Asia is detected, but cannot be distinguished from admixture from South Asia. Maternal admixture from West Asia is excluded. Within the Maldives, we find a subtle genetic substructure in all marker systems that is not directly related to geographic distance or linguistic dialect. We found reduced Y-STR diversity and reduced male-mediated gene flow between atolls, suggesting independent male founder effects for each atoll. Detected reduced female-mediated gene flow between atolls confirms a Maldives-specific history of matrilocality. In conclusion, our new genetic data agree with the commonly reported Maldivian ancestry in South Asia, but furthermore suggest multiple, independent immigration events and asymmetrical migration of females and males across the archipelago. Am J Phys Anthropol 151:58–67, 2013


Via Dorian Q Fuller
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Dorian Q Fuller's curator insight, May 30, 2013 1:13 PM

The populations of the Maldives look very India in both the Y and mitochondrial. Would be interesting to have some further regional break down to look at flow from the West coast vs. Bay of Bengal side, and north and south Sri Lanka. 

nativemedia's comment, September 25, 2013 12:14 AM
awesome
Rescooped by Elvin Murday Linganaden from Indian Ocean Archaeology
Scoop.it!

Indian ocean crossroads: Human genetic origin and population structure in the maldives - Pijpe et al.

Indian ocean crossroads: Human genetic origin and population structure in the maldives - Pijpe et al. | indian ocean politics and societies | Scoop.it

The Maldives are an 850 km-long string of atolls located centrally in the northern Indian Ocean basin. Because of this geographic situation, the present-day Maldivian population has potential for uncovering genetic signatures of historic migration events in the region. We therefore studied autosomal DNA-, mitochondrial DNA-, and Y-chromosomal DNA markers in a representative sample of 141 unrelated Maldivians, with 119 from six major settlements. We found a total of 63 different mtDNA haplotypes that could be allocated to 29 mtDNA haplogroups, mostly within the M, R, and U clades. We found 66 different Y-STR haplotypes in 10 Y-chromosome haplogroups, predominantly H1, J2, L, R1a1a, and R2. Parental admixture analysis for mtDNA- and Y-haplogroup data indicates a strong genetic link between the Maldive Islands and mainland South Asia, and excludes significant gene flow from Southeast Asia. Paternal admixture from West Asia is detected, but cannot be distinguished from admixture from South Asia. Maternal admixture from West Asia is excluded. Within the Maldives, we find a subtle genetic substructure in all marker systems that is not directly related to geographic distance or linguistic dialect. We found reduced Y-STR diversity and reduced male-mediated gene flow between atolls, suggesting independent male founder effects for each atoll. Detected reduced female-mediated gene flow between atolls confirms a Maldives-specific history of matrilocality. In conclusion, our new genetic data agree with the commonly reported Maldivian ancestry in South Asia, but furthermore suggest multiple, independent immigration events and asymmetrical migration of females and males across the archipelago. Am J Phys Anthropol 151:58–67, 2013


Via Dorian Q Fuller
more...
Dorian Q Fuller's curator insight, May 30, 2013 1:13 PM

The populations of the Maldives look very India in both the Y and mitochondrial. Would be interesting to have some further regional break down to look at flow from the West coast vs. Bay of Bengal side, and north and south Sri Lanka. 

nativemedia's comment, September 25, 2013 12:14 AM
awesome