DNA studies of Namibia are the cradle of humanity



A study financed by major U.S. and several foundations, and by the National Cancer Institute and the National Institutes of Health, has helped to clarify the origins of the oldest people in the world. 

The San people of Namibia was settled for thousands of years. Its members are descendants of the first humans appeared on Earth, like all African peoples, including those who have migrated to other lands. Today, scientists believe the San as the oldest civilizations. 

For 10 years, Professor Sarah Tishkoff, a geneticist at the University of Pennsylvania, surveyed remote lands of Africa. She has collected DNA samples from 3,000 Africans, 121 from different populations. The test results showed that the burst of 14 ancient tribes is at the origin of this diversity. 

The research team also found correlations between the different languages used by peoples and genetic variations between them. If nearly 2000 dialects are spoken in Africa, can not always link these differences to genetic modification. As explained Christopher Ehret, University of California, the changes in language generally when foreign population is added to another. Each brings its own genetic variation and enrich each other genomes. 

The DNA studies conducted by scientists have also determined that the genealogy of 71% of African Americans has its roots in West Africa. Approximately 15% of them have European origins, further away from Africa. 

However, only 20% of Americans with African origins are from a population that migrated directly from one continent to another. Down the rest of people are travelers who passed through India. Scientists in charge of the study were also able to make an assumption that a group of 150 individuals have left the continent by the Red Sea to colonize the rest of the world. 

Before this study, scientists had little information about the variety of genomes in Africa. This knowledge is essential to understand why diseases are most devastating for some people. It is now possible to identify the genes that predispose a group of individuals to specific diseases.

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