Recent studies have shown that, although modern West Africans have no Neanderthal or West Africans DNA of mysterious archaic hominids. Four populations of West Africa Yoruba, Esan, Mend and Gambian have 2 to 19% of their offspring descended from species not yet discovered by archaic hominids.
Who descended from modern humans and ancestors of Neanderthals and Denisovans. New research from the University of California, Los Angeles. Durvasula and Shankaraman provide complementary lines of evidence for archaic introverts in four populations in West Africa. Image by Bob-Wilder, University of Buffalo.
Contemporaries who have ancestors in Europe, Asia and Oceania carry DNA from two archaic species, Neanderthals and Denisovans, which constitute 1–4% of their genome. These genetic segments came through introversion in modern humans, the process by which members of two populations and, consequently, hybrid individuals, reproduce with members of the parental population.
Recent studies have shown that, although modern West Africans have no Neanderthal or Denisovana ancestry, they may have had introverts by other old housewives in the past. In a new study, researchers Arun Durvasula and Sriram Shankaraman of the University of California, Los Angeles compared the DNA of Neanderthal and Denisovan with the genome of 405 individuals from West Africa.
The scientists focused on four contemporary populations in West Africa: Ibadan to Yoruba, Nigeria to Essen, Sierra Leone to Mende and Gambian. They found differences that could be explained intermittently by an unknown archaic hominid whose ancestors were separated from the human family tree before Neanderthal.
The data suggests that this introversion has occurred relatively recently, or may involve multiple populations of archaic humans, an indication of complex and long-lasting interactions between anatomically modern humans and that of archaic hominids. There may be different populations.
“By combining our results in the West African population, we estimate that the archaic population separated from the ancestors of Neanderthals and modern humans 360,000 years ago and subsequent contradictions between the ancestors of current Africans aged 0–124,000 years behind. Their descendants contribute from 2 to 19%, ”said the authors.
Dr. Durvasula and Drs. Sankararaman also investigated the frequencies of the archaic DNA segments to determine whether natural selection could have shaped the distribution of Arctic genetic variants. “We found 33 loci in Yoruba with an archaic fragment frequency of more than 50% and 37 loci in Mende,” he said.
“Some of these genes are in high frequency in both Yoruba and Yoruba, including NF1 (a tumor suppressor gene), MTFR2 (a gene involved with mitochondrial aerobic respiration in the testicles), HS1717B2 (with hormonal regulation A gene involved) , KCNIP4 (a gene with potassium channels) and TRPS1 TRPS1 (a gene associated with tricorhinofofangles) “.
“Three of these genes have been found for positive selection in Yoruba in previous explorations: NF1, KCNIP4 and TRY1. On the other hand, we did not find high frequencies in MUC7, a previously found gene that disrupts the signature of archaeological introverts.”
The team asks for more analysis of modern and ancient African genomes to reveal the nature of this complex story. “Signs of introversion have been analyzed in West African populations, which raises questions about the identity of archaic hominids and their interactions with modern human populations in Africa,” the researchers said.
“A detailed understanding of archaic introversion and its role in adapting to different environmental conditions will require the analysis of genomes of ancient and extinct genomes throughout the geographic range of Africa.” The results were published in the journal Science Advance.
Ghost ‘was discovered by human ancestors in West Africa. Tracing links between different species is a complex scientific discovery. Scientists say that the first humans living in West Africa may be accompanied by a mysterious “ghost population” like the now extinct ancient human.
The researchers suggest that the DNA of this group represents between 2% and 19% of the genetic ancestry of modern West Africans. They believe the crossing occurred about 43,000 years ago. The scientists found links with the Mende people of Sierra Leone, Yoruba, as well as the Essen people in Nigeria and other groups in the western regions of the Gambia.
The new study was published this week in Science Advances. This suggests that the ancestors of modern West Africans intervened with as-yet-undiscovered species of archaic humans, such as ancient European Neanderthals and ocean populations with Denisovans.
The Neanderthal ‘dived into the ocean’ for shellfish was half Neanderthal girl, half Denisovan. Why we continue to underestimate Neanderthal. The research also sheds more light on how archaic housewives link genetic variation to today’s Africans, which despite being the most genetically diverse continent, remains poorly understood.
Hundreds of thousands of years ago there were many different groups of humans, including modern humans, Neanderthals, and Denisovans. The newly discovered “ghost populations” of ancient human species are likely to be distinct from these groups.
Sriram Sankararaman, a computational biologist who led the research at the University of California, Los Angeles, told BBC Newsday that he believed more such groups would be found in the future. His team looked at the genetic makeup of West Africans and discovered that some of their DNA came from an ancient, inexplicable source.
“As we get more data from various populations, and better data, our ability to examine that data and delve deeper into these ghost populations is going to improve,” said Mr. Shankaraman.