Modern humans emerged 200,000 years ago in a region of northern Botswana, scientists claimed Monday, in what appeared to be the most precise location of mankind's "ancestral homeland" yet discovered.
While it has long been known anatomically modern humans - homo sapiens sapiens - originated in Africa, scientists have until now been unable to pinpoint the precise location of our species' birthplace.
An international team of researchers took DNA samples from 200 Khoesan people, an ethnic group known to carry a high proportion of a branch of DNA known as L0, living in modern day South Africa and Namibia.
They then combined the DNA samples with geographic distribution, archeological and climate change data to come up with a genomic timeline that suggested a sustained lineage of L0 stretching back 200,000 years in the region south of the Zambezi River in Botswana.
Their work created a kind of genetic map tracing L0 lineage to show that prehistoric humans lived in the region for around 70,000 years, before climatic events forced them to begin dispersing throughout the world roughly 130,000 years ago.
"We've known for a long time that modern humans originated in Africa roughly 200,000 years ago," said Vanessa Hayes, from the Garvan Institute of Medical Research and University of Sydney.
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"But what we hadn't known until the study was where exactly this homeland was." The area identified in the study was called Makgadikgadi-Okavango, once home to a massive lake, roughly twice the area of modern-day Lake Victoria. It is largely desert today.
Around 200,000 years ago, tectonic activity caused the lake to begin to break up, creating a vast wetland that researchers say was home to not only the first anatomically modern humans but also to mega fauna such as giraffes and lions.
But by the time 70,000 years had passed, the first genetic split occurs when a subset of the population migrated north east.
Another 20,000 years on, another group travelled south, according to the genomic map compiled in the study, which appeared in the journal Nature.
"Every time a new migration occurs, that migration event is recorded in our DNA as a time stamp," Hayes told AFP.
"Over time our DNA naturally changes, it's the clock of our history."
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