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Archiver > GENEALOGY-DNA > 2007-07 > 1183309896


From: "Dora Smith" <>
Subject: Re: [DNA] Human X chromosome: 5 main haplotypes
Date: Sun, 1 Jul 2007 12:11:36 -0500
References: <mailman.19816.1183089321.3678.genealogy-dna@rootsweb.com><20070629081643.TQYI20226.oaamta04ps.mx.bigpond.com@DINOSAUR><a81622ac0706290514t63a7a9f7y3610e98682248a91@mail.gmail.com>


So one set of markers came from my father, and the other from my mother.
One of my father's markers necessarily came from his father. But did his
father get the marker from his father or his mother? The advantage of Y
DNA and mt DNA is that you can associate the findings with particular lines,
so long ago you know where that line came from.

Yours,
Dora Smith
Austin, TX

----- Original Message -----
From: "Joe Knapp" <>
To: <>
Sent: Friday, June 29, 2007 7:14 AM
Subject: Re: [DNA] Human X chromosome: 5 main haplotypes


On 6/29/07, brian quinn <> wrote:
> A Worldwide Phylogeography for the Human X
> Chromosome
> Simone S. Santos-Lopes1, Rinaldo W. Pereira1,2, Ian J. Wilson3, Se´rgio D.
> J. Pena1
> Available free at
> http://www.plosone.org/article/fetchArticle.action?articleURI=info:doi/10.13
> 71/journal.pone.0000557

Of relevance for this list would be the implications for genealogy.
The authors concentrate on the deep ancestry questions (out-of-Africa,
etc.) but say this in conclusion:

"Other non-recombining regions in the human genome, as they are
identified, can likewise be explored for phylogeographical studies,
each one providing a fresh perspective on human evolutionary history.
Hopefully, from this multitude of points of view, a coherent picture
of the genealogy of the human species will emerge."

OK, maybe they're still talking about large time frames ("human
species", "evolutionary history") but there must be a way to exploit
such information for recent genealogy too.

If I get it right, they identified one (of potentially many more to
come) non-recombining segment of the X chromosome that passes intact
from father to daughter or from mother to child (either sex). So this
X segment in males must come the mother, but it could be the copy she
got from her father or mother--so it might (50% of the time I guess)
shed some light on a man's maternal grandfather, previously
inaccessible through individual yDNA/mtDNA testing? In females there
are two copies, one from each parent, but I suppose it could be sorted
out which one came from which by comparing relatives. In that case
maybe the segment could be used as a proxy "Y" marker for females,
telling them something about their fathers? Seems like it still would
require testing of relatives sort out & so is pretty complicated.

Joe


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