A lost Himalayan people emerges from a Ladakh cave, Pg13

Key Highlights:

• A recent study published in Science Advances revealed genome-wide data from 10 ancient individuals found in a cave in Kargil, Ladakh.
• Radiocarbon dating indicates these individuals lived approximately 1,500 years ago.
• Genetic analysis showed a mix of present-day North Indian, ancient Tibetan, and a third population from Inner Asia.
• Researchers from Deccan College, Pune, Birbal Sahni Institute of Palaeosciences, Lucknow, University of Chicago, and Harvard Medical School were involved in independent studies on these remains.
• The findings shed light on the complex genetic history and population movements in the Himalayan region.

Detailed Insights:

• The cave in Kargil, Ladakh, served as a deliberate burial site, indicating pre-Buddhist Ladakhi practices of laying the dead in natural caves.
• One group of the ancient individuals showed genetic proximity to present-day North Indians, while another was closer to ancient Tibetans.
• Chromosome segments suggest the union between these populations occurred around 2,800 years ago, predating the Tibetan Empire.
• A third genetic component, originating from Inner Asia, was identified in the ancient genomes, though its precise origin (e.g., Bronze Age Xinjiang or steppe populations) is debated between research teams.
• Discrepancies exist between the two independent studies regarding the exact timing of population mixing, with estimates ranging from 2,800 years ago to 2,100-2,500 years ago.
• The region of Kargil historically served as a significant trade route, which could have facilitated continuous genetic admixture among various populations.

Scientific/Technical Concepts Involved:

• Genome-wide data: Comprehensive genetic information covering an organism's entire DNA sequence, used to study ancestry and relationships.
• Radiocarbon dating: A scientific method that determines the age of organic materials by measuring the decay of carbon-14, a radioactive isotope.
• Admixture: The process where two or more previously separated populations interbreed, resulting in a mixed population.
• Ancestral North Indian ancestry: A genetic component identified in many modern North Indian and Pakistani populations, indicating a common ancient lineage.