Y chromosome traced back to ‘Adam’
U. MICHIGAN / STANFORD (US) — Y chromosomes from men all over the world reveal that our male most recent common ancestor likely lived in the same time period as his female equivalent.
Even though the more than 7 billion people on the planet trace their family lineage to a few common ancestors, scientists still don’t know exactly when and how those few ancestors started to give rise to the incredible diversity of today’s population.
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.
(Credit: Leo Reynolds/Flickr)
It’s 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 race’s female line.
Such studies used DNA from mitochrondria—structures inside cells—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.
Scientists from Stanford University, the University of Michigan Medical School, Stony Brook University, and their colleagues, report their findings in Science.
The team hopes their work will lead to further research on Y chromosomes as vehicles for studying human history—and tracing male lineages back to the common “Adam” ancestors.
Jeffrey Kidd, an assistant professor in University of Michigan’s 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—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.
“We’re interested in understanding the historical relationships between many different human populations, and the migration patterns that have led to the peopling of the world,” he says. “We hope that others will make use of this approach and sequence additional chromosomes of interest that are related to the peopling of specific places.”
The study involved Y chromosomes obtained through the Human Genome Diversity Project, and from other sources. It included chromosomes from 69 men in several populations in sub-Saharan Africa, and from Siberia, Cambodia, Pakistan, Algeria, and Mexico.
The great migrations of our ancestors out of Africa, across Asia and Europe, and into the Americas all helped shape today’s populations—as did more recent forces related to colonialism and ever-growing global mobility.
Genetic studies such as this one may help anthropologists understand those migrations—and their timing—even better by giving them a genetic “clock” to use when studying today’s humans, or potentially DNA extracted from ancient bones. It may also help scientists understand the great genetic diversity seen across Africa, and the evolution process that led to modern humans.
The reconciliation of the timing of ancestors some might call “Adam” and “Eve,” however, may be this study’s most important immediate implication.
“This has been a conundrum in human genetics for a long time,” says Carlos D. Bustamante, a professor of genetics at Stanford and senior author of the study.
“Previous research has indicated that the male MRCA lived much more recently than the female MRCA. But now our research shows that there’s no discrepancy. In fact, if anything, the Y chromosome may be a bit older.”
The National Library of Medicine, National Science Foundation, National Institutes of Health, Institut Pasteur, CNRS MIE, and Foundation Simone et Cino del Duca funded the research.
Source: University of Michigan