Unique demographic history and population substructure among the Coorgs of Southern India
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View abstract on PubMed
Summary
This summary is machine-generated.Genetic analysis of the Coorg community reveals distinct population substructure and recent admixture events. Their unique genetic history, including shared ancestry with Palliyar and Sikh Jatt populations, explains their distinctiveness.
Area Of Science
- Population Genetics
- Human Ancestry
- Genetic History
Background
- The genetic landscape of India is shaped by extensive population admixture and isolation.
- The Coorg community in Karnataka presents a unique case due to its sociocultural homogeneity and debated origins.
Purpose Of The Study
- To investigate the genetic origins and demographic history of the Coorg population.
- To understand the genetic relationships between Coorg subgroups and other Indian populations.
Main Methods
- Analysis of autosomal (70 individuals) and uniparental (144 individuals) genetic markers.
- Application of population substructure, drift, haplotype sharing, and founder event analyses.
- Utilized demographic modeling (fastGlobeTrotter, Moments) and admixture graph models (F-statistics).
Main Results
- Identified population substructure within the Coorgs, with significant genetic drift in Coorg3.
- Revealed shared genetic history between Coorg1 and the Palliyar population, with a founder event around 40 Generations Before Present (GBP).
- Demonstrated recent admixture of Coorg3 with Sikh Jatts (~23 GBP) and formation of Coorg2 from Coorg1 and Coorg3 admixture (~11 GBP).
- mtDNA analysis showed ~40% South Asia-specific lineages; Y chromosome analysis indicated Eurasian, Middle Eastern, and Indian haplogroups, suggesting male-mediated migration.
Conclusions
- The Coorgs exhibit complex genetic substructure and a history of admixture and isolation.
- Genetic findings support the explanation for their current sociocultural homogeneity and unique status.
- The study highlights the potential for discovering previously unknown migrations into the Indian subcontinent.
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