|17 July 2016
Genomes reveal double invention of farming in Middle East
A study of 44 people from the Middle East show that two populations invented farming independently, then spreading it to Europe, Africa, and Asia. The results were published on the bioRxiv preprint server, showing that it supports archaeological evidence of farming starting in multiple places.
The evidence is important as it is the first detailed look into the ancestry of individuals from the Neolithic revolution. During this period, some 11,000 years ago, humans living in the Fertile Crescent shifted from a nomadic lifestyle to a sedentary lifestyle, which domesticated crops and transformed sheep, wild boars, and other creatures into domestic animals over thousands of years.
Previously it has been difficult to obtain DNA from this area due to the hot climates. Recent successes in extracting DNA from the petrous let Iosif Lazaridis and David Reich, population geneticists at Harvard Medieval School, analyse these genomes, which were 14,000 to 3,500 years old.
The genomes showed a stark difference between the populations from the southern Levant region and those living across the Zagros Mountains. The Zagros population were found to be closely related to hunter-gatherer populations, supporting the theory that farming was developed independently in the Southern Leva.
Roger Matthews, an Archaeologist from the University of Reading says that: "There has been a school of thought arguing that everything happens first in the southern Levant and everyone learns how to be farmers from this initial dispersal. But the archaeological evidence shows very strong local traditions that are clearly not in communication with each other, persisting for centuries if not millennia."
The farmers from Zagros domesticated goats and cereal such as emmer, while their counterparts in the west had barley and wheat. According to Rogers, Sometime 9,500 years ago, the traditions spread through the Middle East, possible mixing in eastern Turkey while seeking out materials for tools, such as obsidian. Rogers also states that more research is needed to find how farming spread to the east.
LaLueza-Fox sees that the ability to extract DNA from hotter climates as an important step for prehistoric research, "Retrieving genomic data from the ancient Near East is a palaeogenomic dream come true."
Edited from Nature magazine (20 June 2016)
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