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Sunday, September 21st, 2014

African-American’s Chromosome Study Upsets Known Evolution Timeline

father_child_son_african_american_blackScientists say an African-American male’s odd genetic signature suggests that the human Y chromosome’s lineage goes back further in time than they thought — perhaps due to interbreeding with other populations such as Neanderthals.

“This really upsets a lot of ideas, but at the same time, it’s understandable if we accept that human populations were structured in the past so that there were little pockets of diversity,” said Michael Hammer, an evolutionary biologist at the University of Arizona, who is one of the authors of a study published in the American Journal of Human Genetics.

The study focuses on the analysis of a DNA sample that was obtained from an African-American living in South Carolina and submitted to the Genographic Project, a National Geographic effort aimed at mapping human origins and migration.

The funny thing about this sample is that it didn’t match up with any of the previously known genetic signatures for the Y chromosome, which is passed down from father to son.

“Nobody expected to find anything like this,” Hammer said in a news release.

A team led by Fernando Mendez, a researcher in Hammer’s lab, analyzed more than 240,000 DNA base pairs on the African-American’s Y chromosome. A comparison of the differences between the mystery genetic signature and previously known signatures led the team to conclude that the most recent common ancestor for the entire group lived about 338,000 years ago.

That goes further back than the fossil record goes for anatomically modern humans, Hammer said. “The fossil record speaks to 195,000 years or 200,000 years,” he said. It also goes further back than the previous date for the most recent common ancestor based on Y-chromosome analysis, which is in the range of 142,000 years.

The researchers followed up on their discovery by searching through a genetic database for African populations, and turned up 11 men from western Cameroon who had virtually the same genetic signature.

Hammer said there could be two explanations for the previously unidentified Y-chromosome type: Either the genetic heritage of anatomically correct humans really does go back much further than what’s reflected in the fossil record — or other populations, such as Neanderthals or the more recently identified Denisovans, interbred with modern humans. Anthropologists refer to that pattern of divergence followed by renewed interbreeding as introgression.

The results are “more consistent with introgression of an odd lineage,” Hammer told NBC News. Over the past few years, scientists have been coming around to the view that such interbreeding did take place early in the history of our species. Recent analysis of Neanderthal and Denisovan DNA has indicated that a part of their genetic heritage survives in modern-day humans.

Read More: nbcnews.com

Comments

  1. Yusuf Salaam says:

    Neanderthals are people from europe ?

  2. Scientists say an African-American male’s odd genetic signature suggests that the human Y chromosome’s lineage goes back further in time than they thought. “Nobody expected to find anything like this,” Hammer said in a news release. Most recent common ancestor for the entire group lived about 338,000 years ago. That goes further back than the fossil record goes for anatomically modern humans, Hammer said. “The fossil record speaks to 195,000 years or 200,000 years,” he said. It also goes further back than the previous date for the most recent common ancestor based on Y-chromosome analysis, which is in the range of 142,000 years.
    Roy Bo Wells-This was going to be my next subject-The first born of God. One of the Greatest reasons why we are special to Father……Because we are His oldest son. Will talk about this soon. Order most come for his oldest born son.

  3. Wow, we have to rethink timelines. I think I need to study more on oral history of African ancestors to get a better idea on how old the African is.

  4. Wow, we have to rethink timelines. I think I need to study more on oral history of African ancestors to get a better idea on how old the African is.

    • Peace bro..I thought u would find it interesting if u haven't read them already, THE LOST BOOK OF ENKI by Zechariah Ditching..and THE LAW OF ONE the RA MATERIAL by RA An Humble Messenger of THE LAW OF ONE, very insightful to say the least..enjoy ur heightened levels of awareness ..love and light for those seeking.

  5. It Is What It IS…

  6. There is no such thing as an "African-American"…how ridiculous.

    • I knew someone was gonna raise that argument and it's very curious to me that one would harp so mightily on a term when Blacks , African Americans or Moors as I am sure you would approve of as a perfect description are suffering and dying as if by calling one a moor would save their life. I'm just tired of the bull as if Moors are finding themselves in any better condition as the "Blacks" and "African Americans" who go by the terms find themselves.

  7. FIRST IN ALL THINGS
    African-American’s Chromosome Study Upsets Known Evolution Timeline

    A comparison of the differences between the mystery genetic signature and previously known signatures led the team to conclude that the most recent common ancestor for the entire group lived about 338,000 years ago.
    That goes further back than the fossil record goes for anatomically modern humans, Hammer said. “The fossil record speaks to 195,000 years or 200,000 years,” he said. It also goes further back than the previous date for the most recent common ancestor based on Y-chromosome analysis, which is in the range of 142,000 years.

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