Showing posts with label DNA. Show all posts
Showing posts with label DNA. Show all posts

Friday, April 02, 2010

That's My Mom

Unless new information spontaneously appears from out of the blue, I am thinking that this will be my last post about DNA and our ancient lineage. However, one of those seven clan mothers from yesterday's post is mine, and I want to mention her specifically. I am referring to Jasmine, the youngest of the seven supposed daughters of Eve.

After taking us carefully through all of his DNA science in The Seven Daughters of Eve, Sykes takes off on a bit of a flight of fancy. Essentially, he creates what he deems to be a plausible story for each one. I say story because although he can make a fairly accurate guess as to the time and place where each woman might have lived, he certainly can't be spot on. More importantly, once he had chosen a specific time and place, he could only take a wild guess as to what each woman's life might possibly have been like. Despite the guessing, I feel that creating some sort of plausible account, helped me to relate to my clan mother a little more closely, putting flesh on the skeleton as it were.

Sykes located Jasmine about a mile from the Euphrates River in what is now modern Syria about 10 000 years ago. She lived in a round hut with a thatched roof in a community of perhaps 300 people. As with the six other matriarchs and all people everywhere at the time, this was a village that subsisted on hunting and gathering. She (and perhaps her husband in Sykes' story) noticed that seeds from previous gatherings would tend to sprout where they had dropped.

The next step was to begin to plant seeds deliberately: the beginning of perhaps the greatest change in human history — the Agricultural Revolution. Then, Jasmine began to save seeds from the better plants and thus began to improve the crops and yields. The community soon had a more reliable food supply than ever before, especially when others began to emulate her efforts. From this community, archaeologists and other scientists calculate that the idea quickly spread: in the case of this the subject matter of Sykes' book throughout Europe. The new reality of abundant food supply in turn created a very significant population explosion wherever the Agricultural Revolution went.

Almost 17% of modern Europeans are descended from Jasmine with two specific branches of settlement being evident. "One distinctive branch follows the Mediterranean coast to Spain and Portugal, whence it found its way to the west of Britain where it is particularly common in Cornwall, Wales and the west of Scotland." Meanwhile, another branch traverses through central Europe. Even today, this distribution remains evident.

Jasmine had no idea of what she started and how she changed the world, but change it, she did.

The End

Thursday, April 01, 2010

Our Seven Mothers

As most of you know, I recently had my DNA tested and have posted on the topic a few times lately. What can I say, it interests me. Perhaps it's a yearning for the connectedness which I was musing on the other day. Perhaps it just interests me for no particular reason, Frankly, I don't know. What I do know is that I ordered Bryan Sykes book, The Seven Daughters of Eve, and when it arrived from Chapters the other day, I ended up reading it in fairly short order. Much of the book is both an explanation of how DNA forensics works and Sykes' part in developing analyzing the process: the history and the science as it were. At times the book becomes heavily scientific and sometimes quite statistical, but for the most part it is comprehensible to the lay person.

The crux of the study is his analysis of Europe's population, where he and others have deduced that approximately 95% of Europeans exhibit the mitochondrial DNA of just seven clan mothers. Along the way he concludes that all Europeans and in fact all people are modern humans: that is to say, Homo sapiens. For quite a while it was speculated that some Neanderthal genes, for example, might have mixed with ours, but no evidence for this has been found, and it appears that modern humans totally replaced the Neanderthals in Europe and any other earlier forms of humans elsewhere.

The seven European clan mothers, or daughters of Eve, have been given names, at least by Sykes. Ursula, the oldest, is thought to have lived in what is now Greece about 45 000 years ago, and is the mother to 11% of today's Europeans. Jasmine, the youngest, came on the scene, probably in what is now Syria, only about 10 000 years ago; she is clan mother to 17% of Europe's people. In between the two are Helena (southern France, 30 000 years, clan matriarch to 47% of Europe), Xenia ( Caucasus, 25 000 years, 6% ), Velda (the mountains of northern Spain, 17 000 years, 5%), Tara (Tuscany, Italy, 17 000 years, 9%),and Katrine (near Venice, Italy, 15 000 year, 6%). It's plain to see that each of these matriarchs lived at different times and places, but it is their DNA that has been passed on to almost all Europeans today. As far as I can tell from what I know about my readers, one of these seven women is your clan mother.

In turn, all seven of these women can trace their ancestry back to Lara who lived in Africa long before this. While Lara, herself, probably did not leave Africa (as she has descendants there), it is clear that her descendants (carrying her DNA) did. Lara was not Mitochondrial Eve; that woman lived many tens of thousands of years before Lara (about 150 000 years ago), and she is the mother of us all.

Although Sykes' area of endeavor was in Europe, he does mention that worldwide there are thought to be 33 clans, 13 of them being African, which is where we all originated. Africa, with only 13% of the world's population, is home to about 40% of the world's maternal clans. This seems disproportion is simply because Homo sapiens have lived there longer than anywhere else, and therefore, there has been more time for genetic mutations to occur in Africa.

Note: I may go on to talk a little bit more about Jasmine, my clan mother, in another post, but I'm sure this one has been long enough and dry enough to induce great yawns from Texas to Scotland.