Last week I wrote about the results of my Family Finder autosomal DNA test by Family Tree DNA (see “A Review of Family Tree DNA’s Family Finder – Part I“). The Family Finder test uses a whole-genome SNP scan to find stretches of DNA shared by two individuals, thus identifying your genetic cousins (and will soon include the Population Finder analysis of admixture percentages). I currently have over 33 genetic cousins in Family Finder, and I’m working with them to identify our common ancestor(s).
The Affymetrix microarray chip used by FTDNA includes over 500,000 pairs of SNPs located on the X chromosome and the autosomes (no Y chromosome SNPs). Via SNPedia:
FamilyTreeDNA uses an Affymetrix Axiom CEU microarray chip with 3,269 SNPs removed (563,800 SNPs reported) for autosomal and X (but not Y or mitochondrial) ancestry testing for $289. Other sources have cited 548011 snps. This platform tests 1871 of the 12442 snps in SNPedia.
This paper is a follow-up to a 2008 paper called the “ASHG Ancestry Testing Statement and Recommendations” in which a committee from the ASHG addressed concerns about the claims made by genetic ancestry testing companies. I wrote an article here on the blog at the time – The ASHG Ancestry Testing Statement and Recommendations – that highlighted a number of concerns I had about the statement and the recommendations.
When I wrote the November 13, 2008 blog post, I began by pointing out my personal positions, which have largely remained unchanged in the intervening 1.5 years:
Randy Seaver at Genea-Musings (â€œI’m Puzzled by DNA Claims on â€˜Faces of Americaâ€™â€) writes about the fourth and last episode of â€œFaces of America,â€ a PBS documentary series investigating the ancestry of several famous people in America. This fourth episode included several different types of genetic genealogy to examine the ancestral origins and relatedness of the showâ€™s members.
1. Whole Genome Sequencing by Knome
The first type of genetic genealogy was whole-genome sequencing by Knome of Henry Louis Gates and his father. This analysis examined Henryâ€™s (â€œSkipâ€™sâ€) genome for medical conditions and physical traits, and also compared his DNA to his fatherâ€™s, thereby allowing them to deduce the entire DNA contribution from his deceased mother. This segment was actually quite moving, as Dr. Gates was able to establish this intimate connection to the mother that he and his father obviously missed very much.
Familybuilder, launched in 2007, is a genealogy company that ranks among the top 10 online genealogy services in the world with over 17 million users and over 120 million family tree profiles.Â Late last year the company began offering a genetic genealogy product, as I wrote about here on the blog (see â€œFamilybuilder Announces DNA Testingâ€).
Disclosure: This is a review of Familybuilderâ€™s Y-DNA service using a kit I received free of charge for purposes of this review.Â Please note that this is not meant to be an endorsement but merely a review of the Y-DNA service offered by Familybuilder.
The results of a Familybuilder Y-DNA test includes:
â€œThe Migration Map for you and your ancestors, your 17 Markers, your Haplogroup and the History of your DNA.Â In addition, the ability to share your results with family and friends on social networks such as Facebook and MySpace as well as a downloadable PDF (suitable for framing).â€
I recently received an interesting question from a reader (see this comment) about 23andMe’s Relative Finder, and thought it would be worth sharing the question and my answer with all my readers.
I’m a man who recently took a 23andMe test, and I have a question about Relative Finder. Another man who I match on 36 of 37 Y-DNA markers via Family Tree DNA also took a 23andMe test. We believe that we are third cousins, but this individual does not show up as related in Relative Finder, nor does he show any similarities in the Family Inheritance section. Does this mean that we are not related at all?
If two individuals do not share any DNA in the Family Inheritance section of 23andMe or do not appear as relatives in Relative Finder, this absolutely does not mean that they are not or cannot be relatives. It does suggest, however, that the two individuals might not share any DNA. Although your Y-DNA test suggests that you share a recent common male ancestor, it appears that apart from your Y chromosomes you do not share any other DNA.
Linda Avey, co-founder of 23andMe, has started a new blog entitled The Life & Times of Lilly Mendel. I’m looking forward to some interesting reading as Linda establishes the Brainstorm Research Foundation dedicated to the study of Alzheimer’s disease.
On July 8th, Ancestry.com hosted a webinar called “Genetic Genealogy Made Easy.”Â The webinar is now posted and can be accessed at any time.Â One great thing about a webinar is that it can be multimedia; indeed, this webinar uses both slides and video.
The presentation is pretty basic, but a good source of information for people who are new to genetic genealogy.Â The following topics are covered, according to the site:
- DNA testing for genealogy works–in easy terms.
– To understand and apply your results to grow your tree.
– Ancestry.com DNA testing can continue to pay off for years.
– Women can benefit from a paternal lineage test.
– To use Ancestry.com DNA features: Groups, Transfer to Tree, and Ancient Ancestry.
Last month I wrote “Unlocking the Genealogical Secrets of the X Chromosome” and posted a few charts that show the inheritance of the X-chromosome through 8 generations. I thought these charts might be helpful since inheritance of the X-chromosome can be difficult to understand without seeing it.
New Chart with Ahnentafel Numbers
Since posting the article, two new charts have been created using the originals. I made one, and the other was made by Rodney Jewett (who gave me permission to re-post the chart here) and posted at dna-forums.org.
Mr. Jewett added the Ahnentafel numbers of contributing X-chromosome ancestors to the chart. Using these numbers, an individual can simply create a numbered Ahnentafel report to identify X-chromosome contributing ancestors using this chart:
A new article in Ancestry Magazine, “Meeting My New Family,” details a recent meeting of genetic relatives in Chicago.Â The author is Howard Wolinsky, who has written other articles in the field of genetic genealogy (see, for example, an article in EMBO about 2 years ago).Â As Howard describes, the meeting wasn’t a traditional family reunion:
“We are a new kind of cousin. Until a few days ago, we were strangers who just happened to have had our DNA analyzed. Then we discovered we matched one another to varying degrees. Most of us have common Jewish connections. And we learned that we come from relatively rare branches of the human DNA tree. Our mothersâ€™ mothers came from the HV branch. Our fathersâ€™ fathers came from the G group.”