The advantages of a validated signature

[French version]

A validated signature provides the genealogist with the almost certainty that the considered signature was indeed that of the MRCA.  Prior the MRCA, certainty declines on average by 1% at each generation. Indeed, a Non-Parental-Event (NPE) may have occur at any of the generations that preceded the MRCA, introducing a rupture in the transmission of DNA from a documented ancestor to any of alleged filial descendant that lived upstream the MRCA.

A successful triangulation thus establishes the validity of  the whole chain of filiations from the MRCA down to the persons who provided the DNA in support of the triangulation.

Once validated, any genealogist can use this information to validate at least partially matrilines and patrilines in any genealogy that contains these ancestors.  Indeed, a genealogical tree is composed of alternate matrilines and patrilines. To validate a whole chain of filiations part of a matriline through mtDNA or those of a patriline through Y-DNA, the genealogist compares the signature of an alleged living descendant to that of the ancestor at the apex of his matriline or patriline. When these signatures match,  this identity confirms the whole chain of documented filiations in a matriline or patriline leading to the person tested.

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A validated ancestral signature can also be used to predict the signature of descendants. This is a very powerful advance for genealogy, which is brightly exploited by Denis BEAUREGARD’s FrancoGene.

In some cases,  validated ancestral signatures will show very peculiar characteristics and will belong to a very restricted haplogroup in the studied population. Knowing the signature of a newly tested person, it becomes possible in many cases to predict its matriarch or patriarch,  in absence of knowing the corresponding paper trail. Conversely, knowing from documentary research who was the matriarch or the patriarch of someone makes it possible to predict, using our Catalogue, to predict the signature of the person tested.

In general, once the matriarch or patriarch is known, documentary research is greatly facilitated. In some cases, knowledge of the matriarch or the patriarch on the DNA level will bypass a documentary impasse or will solve family rumors, helping to resolve family mysteries. Knowing who was most probably our matriarch or patriarch can guide documentary research.  This is particularly useful for adopted persons or for those who have lost their surname or roots.

Most genealogists aim to complete their paper trail in the country of origin of the pioneer who founded their mtDNA and Y-DNA lines in America and  possibly reconnect with long lost cousins in Europe or elsewhere. However, in order to ‘cross the pond’,  one must firstly verify that his or her signature is really that brought by the pioneer. This verification must be done through triangulation BEFORE inviting to test or sending free kits to Europeans carrying the same surname or reporting a common shared ancestress that lived overseas prior to the arrival of the pioneer.

It is thus clear that a triangulated signatures can serve as a beacon for those seeking their origins. When a genealogist finds that his signature is consistent with that published in the catalogue and his paper trail leads to the same matriarch or patriarch as that mentioned in the Catalogue,  such a knowledge confirms the authenticity of his documentary research as well as descent from that ancestor.

On the contrary, when the mtDNA signature of a descendant does not match that of the matriarch or patriarch foreseen by the documentary research,  the genealogist understands that he is in the presence of a Non Parental Event (NPE) or that his documentary research is in error, suggesting a redirection of his research.