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Ghost Lineage

All articles tagged with #ghost lineage

Africa’s ghost lineage left a subtle DNA imprint on all modern humans
science25 days ago

Africa’s ghost lineage left a subtle DNA imprint on all modern humans

A Berkeley-led study using ancestral recombination graphs and a new tool called TRACE detected a third, “ghost” lineage that interbred with early modern humans in Africa before the out‑of‑Africa migration. This lineage contributes roughly 0.5–1.1% of today’s genomes (about 1.5 billion bases) across populations, with older, less-recombined DNA found in African groups and in regions called deserts where Neanderthal/Denisovan DNA is scarce. The research also suggests a possible “superarchaic” introgression into Denisovans, but the biological impact of these archaic segments remains unclear.

via Ars Technica|
#ancient-dna#ghost-lineage#human-evolution
Ancient DNA maps three waves of Indigenous American arrival and a ghost lineage
science4 months ago

Ancient DNA maps three waves of Indigenous American arrival and a ghost lineage

An international analysis of 128 Indigenous American genomes from across the Americas reveals three migration waves into South America: the earliest over 9,000 years ago, a second lineage around that period, and a previously unrecognized dispersal at least 1,300 years ago linked to Mesoamerica. Researchers also identify a faint Asian “ghost lineage” called Ypykuéra that contributed genes to Indigenous Americans and early Australasians, indicating a more complex peopling of the continents. Indigenous genomes are less diverse than those of other continents but harbor adaptive genes related to immune function, metabolism, and fertility, underscoring environmental pressures and the importance of including Indigenous communities in genomic studies.

via Live Science|
#ancient-dna#genomics#ghost-lineage