The when and where of Y: Research on Y chromosomes uncovers new clues about human ancestry
From: U of M Health
First full-chromosome sequencing effort shows most recent male & female common ancestors lived around the same time
More than 7 billion people live on this planet Ė members of a single species that originated in one place and migrated all over the Earth over tens of thousands of years.
But even though we all trace our family lineage to a few common ancestors, scientists still donít know exactly when and how those few ancestors started to give rise to the incredible diversity of todayís population.
A brand-new finding, made using advanced analysis of DNA from all over the world, sheds new light on this mystery. By studying the DNA sequence of Y chromosomes of men from many different populations, scientists have determined that their male most recent common ancestor (MRCA) lived sometime between 120,000 and 156,000 years ago.
Itís the first time the human ancestry has been traced back through the male line by sequencing the DNA of many entire Y chromosomes.
And, it agrees reasonably well with previous findings about our female most recent common ancestor, made by studying DNA carried down through the human raceís female line. Such studies used DNA from mitochrondria -- structures inside cells Ė and placed that time of the most recent common ancestor between 99,000 and 148,000 years ago. That agreement makes the new finding especially significant:
The research was done by a team of scientists from Stanford University, the University of Michigan Medical School, Stony Brook University, and their colleagues, and is published in the journal Science.
The team hopes their work will lead to further research on Y chromosomes as vehicles for studying human history Ė and tracing male lineages back to the common ďAdamĒ ancestors.
Jeffrey Kidd, Ph.D., an assistant professor in U-Mís departments of Human Genetics and Computational Medicine & Bioinformatics who worked on the new study, notes that only recently has it become possible to sequence Y chromosomes, because of technical limitations of previous approaches.
The new paper details how the team was able to make reliable measurements of the sequence variation along the Y chromosome Ė which is handed down only from father to son without exchanging, or recombining, genetic material with other chromosomes.
Kidd notes that this initial paper on Y chromosome sequence diversity provides important first evidence that the male most recent common ancestor did not live more recently than the female most recent common ancestor.
ďWeíre interested in understanding the historical relationships between many different human populations, and the migration patterns that have led to the peopling of the world,Ē he says. ďWe hope that others will make use of this approach and sequence additional chromosomes of interest that are related to the peopling of specific places.Ē
Read the full article at: uofmhealth.org
Found: The Footprints of Adam and Eve from a World Before Our Own
How Mitochondrial Eve connected all humanity and rewrote human evolution
Genetic íAdamí and íEveí lived roughly at same time
DARPA to Genetically Engineer Humans by Adding a 47th Chromosome
Menís sex chromosome is doomed?
Human chromosome much older than previously thought
Latest News from our Front Page
ISIS Oil Trade Full Frontal: "Raqqa's Rockefellers," Bilal Erdogan, KRG Crude, And The Israel Connection
"Effectively, we have been financially discriminated against for a long time. By early 2014, when we did not receive the budget, we decided we need to start thinking about independent oil sales‚ÄĚ -- Ashti Hawrami, Kurdistan‚Äôs minister for natural resources
In June of 2014, the SCF Altai (an oil tanker) arrived at Ashkelon port. Hours later, the first shipment of Kurdish ...
Prosecutors ban Soros Foundation as 'threat to Russian national security'
The Russian Prosecutor General‚Äôs Office has recognized George Soros‚Äôs Open Society Institute and another affiliated organization as undesirable groups, banning Russian citizens and organizations from participation in any of their projects.
In a statement released on Monday, prosecutors said the activities of the Open Society Institute and the Open Society Institute Assistance Foundation were a threat to the foundations of Russia‚Äôs ...
Israeli Colonel Caught with Islamic State (IS) Pants Down
This was definitely not supposed to happen. It seems that an Israeli military man with the rank of colonel was ‚Äúcaught with IS pants down.‚ÄĚ By that I mean he was captured amid a gaggle of so-called IS‚Äďor Islamic State or ISIS or DAESH depending on your preference‚Äďterrorists, by soldiers of the Iraqi army. Under interrogation by the Iraqi intelligence ...
Uh-Oh 14,000 Illegal Immigrants in Sweden Disappear without a Trace
More than 14,000 foreign nationals told to leave Sweden have instead gone underground, with police saying there is little they can do to enforce deportation orders.
A total of 21,748 people had been given deportation orders by the Migration Agency at the end of October ‚Äď the largest number in history, the Aftonbladet tabloid reported on Friday.
Of those, 14,140 are registered ...
Munich Jews battle in court over Holocaust remembrance
Two Jewish groups in Munich are at odds over how to remember the Holocaust. The situation has escalated, and now one of the groups is suing the city. The argument centers on ‚ÄėStolpersteine‚Äô - bronze memorial plaques that can be found all over Germany, but not in Munich.
In July, Munich voted to continue the ban on Stolpersteine first introduced in ...
|More News » |