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'Ghost' DNA In West Africans Complicates Story Of Human Origin


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 2 weeks ago '18        #1
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prettygirlmafia  topics gone triple plat - Number 1 spot x2
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'Ghost' DNA In West Africans Complicates Story Of Human Origin
 

 
Scientists have found traces of DNA that they say is evidence that prehistoric humans procreated with an unknown hominin group in West Africa.

About 50,000 years ago, ancient humans in what is now West Africa apparently procreated with another group of ancient humans that scientists didn't know existed.

There aren't any bones or ancient DNA to prove it, but researchers say the evidence is in the genes of modern West Africans. They analyzed genetic material from hundreds of people from Nigeria and Sierra Leone and found signals of what they call "ghost" DNA from an unknown ancestor.

Our own species — Homo sapiens — lived alongside other groups that split off from the same genetic family tree at different times. And there's plenty of evidence from other parts of the world that early humans had s*x with other hominins, like Neanderthals.

That's why Neanderthal genes are present in humans today, in people of European and Asian descent. Homo sapiens also mated with another group, the Denisovans, and those genes are found in people from Oceania.

The findings on ghost DNA, published in the journal Science Advances, further complicate the picture of how Homo sapiens — or modern humans — evolved away from other human relatives. "It's almost certainly the case that the story is incredibly complex and complicated and we have kind of these initial hints about the complexity," says Sriram Sankararaman, a computational biologist at UCLA.

The scientists analyzed the genomes of 405 West Africans. Sankararaman says they used a statistical model to flag parts of the DNA. The technique "goes along a person's genome and pulls out chunks of DNA which we think are likely to have come from a population that is not modern human."

The unusual DNA found in West Africa isn't a*sociated with either Neanderthals or Denisovans. Sankararaman and his study co-author, Arun Durvasula, think it comes from a yet-to-be-discovered group.

"We don't have a clear identity for this archaic group," Sankararaman says. "That's why we use the term 'ghost.' It doesn't seem to be particularly closely related to the groups from which we have genome sequences from."

The scientists think the interbreeding happened about 50,000 years ago, roughly the same time that Neanderthals were breeding with modern humans elsewhere in the world. It's not clear whether there was a single interbreeding "event," though, or whether it happened over an extended period of time.

The unknown group "appears to have split off from the ancestors of modern humans a little before when Neanderthals split off from our ancestors," he says.

Sharon Browning, a biostatistics professor at the University of Washington who has studied the mixing of Denisovans and humans, says "the scenario that they are discovering here is one that seems realistic."

Browning notes that the ghost DNA appears frequently in the genetic material. "That tells us that these archaic populations might have had some DNA that did some useful stuff that's proved to be useful to the modern population," she says.

But at the moment, Sankararaman says, it's not possible to know what, if any, role these genetic materials have for modern humans who carry them. "Are they just randomly floating in our genomes? Do they have any kind of adaptive benefits? Do they have deleterious consequences?" he added. "Those are all questions which would be fantastic to start thinking about."

He says there is likely evidence of other ghost populations in modern humans in other parts of the world. "I think as we get the genome sequences from different parts of the world at different points in time, there is always the possibility that we might discover these as-yet-unidentified ghost populations," Sankararaman says.

It's also possible that the ghost DNA found in this study comes from multiple groups, Browning added. "Within Africa, we don't know how many archaic groups might have been involved, and the study doesn't tell us that," she says. "It tells us that there was integration, but it could have been from more than one archaic population, in theory."

Compared with the Neanderthals, where there is abundant DNA fossil evidence, physical samples are much harder to come by in Africa. Browning says the climate on the continent has made it challenging.

"The conditions have to be right for the fossils to not totally disintegrate" in order to recover DNA, Browning says. Bones have been found in Africa from archaic populations, but no DNA has been recovered. Still, she adds, "the technology is continuing to improve, and people are still out there looking for more fossils."

So what happened to this mysterious group of ancient humans? Scientists aren't totally sure.

They might have died off, or they might have eventually been completely subsumed into modern humans.
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 2 weeks ago '07        #2
Damagegadget  topics gone triple plat - Number 1 spot x1
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yea the same ones who left africa, into caves
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 2 weeks ago '20        #3
NachoDips 
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That’s crazy as hell



+2   

 2 weeks ago '13        #4
SimpinAintEz 
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No source in sight? Wildish section?





Last edited by SimpinAintEz; 02-14-2020 at 11:19 AM..
+11   

 2 weeks ago '15        #5
Destro 
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 SimpinAintEz said
No source in sight? Wildish section?



+3   

 2 weeks ago '16        #6
rempleTakalaka 
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50,000 years ago.... West Africa .... more lies smh ...

Many accounts of that coast was said to be uninhabited for a really really long time.



West Africa is a geographically vast region (consisting of Benin Republic, Burkina Faso, Cameroun, Cape Verde, Chad, Cote d'Ivoire, Equatorial Guinea, Gambia, Ghana, Guinea Bissau, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, Sao Tome and Principe, and Togo) where fossils of early humans are still to be found. This is unlike eastern, southern, and northern Africa where early human fossils and their ancestors were found (Shaw 2004:25). The absence of early human fossils in West Africa generally implies that early humans might not have lived in West Africa. Furthermore, the fact that the history of early travellers to West Africa was not documented or known (Shinnie 1965:76), as well as the non-permanent settlements of early European explorers on West African shores (Boateng 1978:10), suggest a low patronage of West African archaeology in comparison to how archaeology is patronised in other African regions and especially in southern Africa. Boateng adds that the climatic and other physical conditions of West Africa discouraged Europeans from settling permanently in West Africa:
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 2 weeks ago '05        #7
projectd06 
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 2 weeks ago '17        #8
92baby 
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 projectd06 said
Speaking of that did the Bible ever mention

Other species of humans besides us?


The idea that we are actually aliens makes more sense then yea some n*gga in heaven made us from Adam and Eve

Probably will never know in our lifetime tho
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 2 weeks ago '16        #9
KWizzle 
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sooooooo no evidence equal proof ?
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 2 weeks ago '04        #10
georgebenson  topics gone triple plat - Number 1 spot x1
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Enough of this "we don't know where it came from" bullsh*t!
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 2 weeks ago '16        #11
Boogie1790 
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 rempleTakalaka said
50,000 years ago.... West Africa .... more lies smh ...

Many accounts of that coast was said to be uninhabited for a really really long time.



West Africa is a geographically vast region (consisting of Benin Republic, Burkina Faso, Cameroun, Cape Verde, Chad, Cote d'Ivoire, Equatorial Guinea, Gambia, Ghana, Guinea Bissau, Liberia, Mali, Mauritania, Niger, Nigeria, Senegal, Sierra Leone, Sao Tome and Principe, and Togo) where fossils of early humans are still to be found. This is unlike eastern, southern, and northern Africa where early human fossils and their ancestors were found (Shaw 2004:25). The absence of early human fossils in West Africa generally implies that early humans might not have lived in West Africa. Furthermore, the fact that the history of early travellers to West Africa was not documented or known (Shinnie 1965:76), as well as the non-permanent settlements of early European explorers on West African shores (Boateng 1978:10), suggest a low patronage of West African archaeology in comparison to how archaeology is patronised in other African regions and especially in southern Africa. Boateng adds that the climatic and other physical conditions of West Africa discouraged Europeans from settling permanently in West Africa:
Facts the Kongo is largely unexplored
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 2 weeks ago '16        #12
uncleDrew 
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 92baby said
Speaking of that did the Bible ever mention other species of humans besides us?


The idea that we are actually aliens makes more sense then yea some n*gga in heaven made us from Adam and Eve

Probably will never know in our lifetime tho
The Nephilim
+5   

 2 weeks ago '05        #13
Soprano ATL  topics gone triple plat - Number 1 spot x1
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 Boogie1790 said
Facts the Kongo is largely unexplored
One of the most fascinating regions. sh*t is so dense and there is so little known outside of the indigenous tribes.
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 2 weeks ago '05        #14
projectd06 
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 92baby said
Speaking of that did the Bible ever mention

Other species of humans besides us?


The idea that we are actually aliens makes more sense then yea some n*gga in heaven made us from Adam and Eve

Probably will never know in our lifetime tho
That's why life and death is nuts, no one can prove where we came from and no one can prove what happens after, that's why it's a never ending debate.

We would all like to think something happens after death, I think that's just wishful thinking, but rather think that then yo accept dying and then nothing....
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 2 weeks ago '04        #15
VerballyAbusive 
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I bet that Neanderthal pu**y had n*ggas in a different realm
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 2 weeks ago '17        #16
92baby 
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 projectd06 said
That's why life and death is nuts, no one can prove where we came from and no one can prove what happens after, that's why it's a never ending debate.

We would all like to think something happens after death, I think that's just wishful thinking, but rather think that then yo accept dying and then nothing....
I think that’s the case as well


You just die
-2   

 2 weeks ago '17        #17
Belize123 
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 92baby said
Speaking of that did the Bible ever mention

Other species of humans besides us?


The idea that we are actually aliens makes more sense then yea some n*gga in heaven made us from Adam and Eve

Probably will never know in our lifetime tho
Yes, God created Humans (Hu=Black) in the garden and made them the gatherers. Neanderthals and "Ghost" types were running around k*lling and eating meat. The humans of the garden began to procreate with others after they were kicked out the garden


Last edited by Belize123; 02-14-2020 at 07:26 PM..
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 2 weeks ago '17        #18
92baby 
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 Belize123 said
Yes, God created Humans (Hu=Black) in the garden and made them the gatherers. Neanderthals and "Ghost" types were running around k*lling and eating meat.
Weren’t Africans also k*lling and eating meat?

+3   

 2 weeks ago '17        #19
Belize123 
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 92baby said
Weren’t Africans also k*lling and eating meat?

God's chosen people respected life when they were pure and knew no sin. That's why the Word clearly identified them as Gatherers and not hunters.
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 2 weeks ago '13        #20
BLACK MAMBA 
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 92baby said
I think that’s the case as well


You just die
i can tell you without a doubt god exists.
+4   

 2 weeks ago '05        #21
tokinjohn 
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Got me wondering about some of those "results" from ancesty that seemed a lil off.
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 2 weeks ago '14        #22
Mvpmania  topics gone triple plat - Number 1 spot x2
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 BLACK MAMBA said
i can tell you without a doubt god exists.
Which god specifically?
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 2 weeks ago '15        #23
Black Larry 
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Book of Enoch. Gov't knows what's up. US trying to destroy the rest of the culture they stole in Iran. There's evidence for giants and other life. But they so deep into their lie. This is what they do.

Cesar destroyed the library of Alexander so he could declare himself a God. They've been doing this. Since Egyptian time. They said that sphinx might be a million years old. They don't know or won't say for sure. It took them years to admit that it was really water Erosion on the sphinx and not from The wind. The Egyptians re carved the face so that they could claim they made it but they didn't. Lol.
+9   

 2 weeks ago '17        #24
92baby 
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 BLACK MAMBA said
i can tell you without a doubt god exists.
Yea.aight
+1   

 2 weeks ago '16        #25
uncleDrew 
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 Black Larry said
Book of Enoch. Gov't knows what's up. US trying to destroy the rest of the culture they stole in Iran. There's evidence for giants and other life. But they so deep into their lie. This is what they do.

Cesar destroyed the library of Alexander so he could declare himself a God. They've been doing this. Since Egyptian time. They said that sphinx might be a million years old. They don't know or won't say for sure. It took them years to admit that it was really water Erosion on the sphinx and not from The wind. The Egyptians re carved the face so that they could claim they made it but they didn't. Lol.
According to the emerald tablets of Thoth, the Sphinx was a lion, which just so happened to face the Leo constellation. There’s also something supposedly under the Sphinx. But this is all a*suming the translations are correct. Until we can learn to translate ancient, mythical writing, we’ll just have to take it with a grain of salt
+2   



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