Angela
Elite member
- Messages
- 21,823
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- Ethnic group
- Italian
"Dissecting the influence of Neolithic demic diffusion on Indian Y-chromosome pool through J2-M172 haplogroup"
http://www.nature.com/articles/srep19157
"The global distribution of J2-M172 sub-haplogroups has been associated with Neolithic demic diffusion. Two branches of J2-M172, J2a-M410 and J2b-M102 make a considerable part of Y chromosome gene pool of the Indian subcontinent. We investigated the Neolithic contribution of demic dispersal from West to Indian paternal lineages, which majorly consists of haplogroups of Late Pleistocene ancestry. To accomplish this, we have analysed 3023 Y-chromosomes from different ethnic populations, of which 355 belonged to J2-M172. Comparison of our data with worldwide data, including Y-STRs of 1157 individuals and haplogroup frequencies of 6966 individuals, suggested a complex scenario that cannot be explained by a single wave of agricultural expansion from Near East to South Asia. Contrary to the widely accepted elite dominance model, we found a substantial presence of J2a-M410 and J2b-M102 haplogroups in both caste and tribal populations of India. Unlike demic spread in Eurasia, our results advocate a unique, complex and ancient arrival of J2a-M410 and J2b-M102 haplogroups into Indian subcontinent."
" J2a-M410 and J2b-M102 in the subcontinent may reflect any combination of unknown and known movements. Though, the genealogical ages for Indian J2a-M410 and J2b-M102 are correlating with appearance of agriculture in Indus Valley (~6KYA) and Mehrgarh (~9KYA) and falling well within the Neolithic range, differential presence and distribution of J2-M172 sublineages and other associated HGs depict a complex picture. Most likely events responsible for the current distribution of J2-M172 sublineages into Indian subcontinent could be any combination of 1) entry of herders from West and Central Asia/Middle East during late glacial maximum (LGM) of Holocene, 2) Neolithic demic diffusion from the West, and 3) Bronze and Iron age migration/admixtures."
"ConclusionAbsence or negligible presence of classical markers of Eurasian demic diffusion in India advocates against it to be the sole explanation of J2a-M410 and J2b-M102 distribution in the subcontinent. High variance, haplotype diversity with no sharing haplotype, geographically pronounced phylogeny and seemingly autochthonous origin of sublineage J2a-M68, suggest towards the antiquity of the HGs. Dispersal of J2a-M410 and J2b-M102 from Near East to NW region and further eastwards of the subcontinent seems to have unique and complex history of various known and unknown possible events. Regardless of the complexity of dispersal, NW region appears to be the corridor for entry of these haplogroups into India. Remarkable presence of J2a-M410 among tribal groups inhabited in remote geographical regions strongly dismisses the earlier belief of it to be caste-specific."
More endless speculating based on modern distributions. Are we ever going to get any ancient dna?
http://www.nature.com/articles/srep19157
"The global distribution of J2-M172 sub-haplogroups has been associated with Neolithic demic diffusion. Two branches of J2-M172, J2a-M410 and J2b-M102 make a considerable part of Y chromosome gene pool of the Indian subcontinent. We investigated the Neolithic contribution of demic dispersal from West to Indian paternal lineages, which majorly consists of haplogroups of Late Pleistocene ancestry. To accomplish this, we have analysed 3023 Y-chromosomes from different ethnic populations, of which 355 belonged to J2-M172. Comparison of our data with worldwide data, including Y-STRs of 1157 individuals and haplogroup frequencies of 6966 individuals, suggested a complex scenario that cannot be explained by a single wave of agricultural expansion from Near East to South Asia. Contrary to the widely accepted elite dominance model, we found a substantial presence of J2a-M410 and J2b-M102 haplogroups in both caste and tribal populations of India. Unlike demic spread in Eurasia, our results advocate a unique, complex and ancient arrival of J2a-M410 and J2b-M102 haplogroups into Indian subcontinent."
" J2a-M410 and J2b-M102 in the subcontinent may reflect any combination of unknown and known movements. Though, the genealogical ages for Indian J2a-M410 and J2b-M102 are correlating with appearance of agriculture in Indus Valley (~6KYA) and Mehrgarh (~9KYA) and falling well within the Neolithic range, differential presence and distribution of J2-M172 sublineages and other associated HGs depict a complex picture. Most likely events responsible for the current distribution of J2-M172 sublineages into Indian subcontinent could be any combination of 1) entry of herders from West and Central Asia/Middle East during late glacial maximum (LGM) of Holocene, 2) Neolithic demic diffusion from the West, and 3) Bronze and Iron age migration/admixtures."
"ConclusionAbsence or negligible presence of classical markers of Eurasian demic diffusion in India advocates against it to be the sole explanation of J2a-M410 and J2b-M102 distribution in the subcontinent. High variance, haplotype diversity with no sharing haplotype, geographically pronounced phylogeny and seemingly autochthonous origin of sublineage J2a-M68, suggest towards the antiquity of the HGs. Dispersal of J2a-M410 and J2b-M102 from Near East to NW region and further eastwards of the subcontinent seems to have unique and complex history of various known and unknown possible events. Regardless of the complexity of dispersal, NW region appears to be the corridor for entry of these haplogroups into India. Remarkable presence of J2a-M410 among tribal groups inhabited in remote geographical regions strongly dismisses the earlier belief of it to be caste-specific."
More endless speculating based on modern distributions. Are we ever going to get any ancient dna?
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