From Oxfordancestry.com Jan 2014.
Maternal Ancestry |
A person’s maternal ancestry is traced by mitochondrial DNA or mtDNA for short. Both men and women possess mtDNA, but only women pass it on to their children.. So we all inherit our mtDNAs from our mothers, but not from our fathers. Your mother inherited it from her mother, who inherited it from hers, and so on back through time. Therefore, mtDNA traces an unbroken maternal line back through time for generation upon generation far further back than any written record. Research at Oxford University and elsewhere over many years has shown that all of our maternal lines are connected at some time in the past and that these connections can be traced by reading mtDNA. One striking finding was that people tended to cluster into a small number of groups, which could be defined by the precise sequence of their mtDNA. In native Europeans, for example, there were seven such groups, among Native Americans there were four, among Japanese people there were nine, and so on. Each of these groups, by an astounding yet inescapable logic, traced back to just one woman, the common maternal ancestor of everyone in her group, or clan. For our MatriLine™ service, we read a section of your mtDNA, about 400 base pairs long, and compare its precise sequence to the many thousands of others from all over the world that we have in our database. That way we can not only give you an exact readout of your DNA sequence, but also discover to which of the clans you belong, and from which ancestral mother you are descended. For many of the ancestral mothers, and there are about 36 world-wide, we know whereabouts they lived and how many ten of thousands of years ago. DNA changes very slowly over time and this is what we use to calculate how long ago the clan mothers lived. By studying features of the geographical distribution of their present-day descendants, we can work out where they lived as well. To emphasise that they were real individuals, we have given them all names and, using archaeological and other evidence, we have reconstructed their imagined lives. Everyone in the same clan is a direct maternal descendant of one of these clan mothers and carries her DNA within every cell of their body. Your mtDNA actually helps cells use oxygen – so you are using your clan mother’s mtDNA every time you breathe. However, not everyone in the same clan has exactly the same mtDNA, because DNA changes gradually over the generations. From your precise DNA result, we are able to assign you a place within the genealogy of the clan, which will be shown on your “Seven Daughters of Eve” or “World Clans” certificate. The clan mothers were not the only people alive at the time, of course, but they were the only ones to have direct maternal descendants living right through to the present day. The other women around, or their descendants, either had no children at all or had only sons, who could not pass on their mtDNA. And, of course, the clan mothers had ancestors themselves. Amazingly, their genealogies have also been discovered. They show how everyone alive on the planet today can trace their maternal ancestry back to just one woman. By all accounts, she lived in Africa about 150,000 – 200,000 years ago and is known as “Mitochondrial Eve”. On your “World Clans” certificate you will see how you and your clan mother relate to all the others in the human family and to “Mitochondrial Eve” herself. THE EUROPEAN CLANS – The Seven Daughters of Eve
The clan of Ursula
The clan of Xenia
The clan of Helena
The clan of Velda
The clan of Tara
The clan of Katrine
The clan of Jasmine The clan of Ulrike |
Paternal Ancestry |
A person’s paternal ancestry can be traced by DNA on the Y-Chromosome or yDNA for short. Only men have a Y-Chromosome, which they inherited from their fathers and will pass on to their sons. However, women can easily find out about their paternal ancestry from the yDNA of a male relative, their father or brother, for instance. The yDNA traces a man’s unbroken paternal line back way into the past in the same manner that your maternal ancestry is traced by mtDNA . All our paternal ancestry services are based on results of our Y-Clan analysis. This uses fifteen carefully selected Y-chromosome markers to reveal your Y-chromosome signature. An enhanced analysis with a further fifty markers is also available. Scientific research throughout the world has shown that all our paternal lines are connected somewhere in the past and that these connections can be traced by reading the yDNA. As with maternal genealogies defined by mtDNA, men tend to cluster into a small number of groups, 18 in total, which can be defined by the genetic fingerprints of their yDNA. In native Europeans, for example, there are 5 such groups, among Native Americans there are 4, among Japanese people there are 5, and so on. The men within each of these groups are all ultimately descended from just one man, their clan father. Obviously, these ancestral clan fathers were not the only men around at the time, but they were the only ones to have direct male descendants living today. The other men around, or their descendants, had either no children at all or only daughters. These clan fathers also had male ancestral lines and these ultimately converge on the common paternal ancestor of every man alive today. This man, know as “Y-Chromosome Adam”, lived in Africa 60,000 – 80,000 years ago. For our classic Y-Clan service, we read fifteen elements of your yDNA fingerprint and build up a signature. By comparing it to thousands of others in our database, obtained from throughout the world, we are able to deduce your paternal clan and your ancient ancestral father. Not only will we be able to tell you from which ancient clan father you are descended, we will also give you some information as to when and where he lived. The genetic elements of your signature also change over the generations and by comparing your genetic signature with those of others it is possible to tell, on the balance of probability, how closely you are related. In some circumstances, analysis of a further fifty markers can be useful, for example for resolving the genealogical relationships between men with identical fifteen marker Y-Clan signatures. In these circumstances we recommend our Y-Clan + 50 analysis. In many countries, surnames are also passed down from father to son, just like the Y-Chromosome. This means that you also can use your Y-Clan results to investigate your paternal lines alongside more traditional genealogical sources in a very powerful combination. For example, you will be able to compare your Y-Clan results with those of other men with the same surname to see whether you share a genetic connection. Our Chairman and founder, Prof Sykes, was the first scientist to establish this connection between surnames and Y-Chromosomes. |