Free Updates

Let us tell you when new posts are added!

Email:

Navigation

Categories

Search

Archives

<April 2014>
SunMonTueWedThuFriSat
303112345
6789101112
13141516171819
20212223242526
27282930123
45678910

More Links










# Thursday, October 09, 2008
Searching for Y-DNA Matches in Other Companies' Databases
Posted by Diane

Q. I took a 46-marker Y-DNA test through Ancestry.com's DNA testing service. Can I post my test results on other organizations' DNA Web sites to search for matches?

A. Most genetic genealogy companies that host public DNA databases will let you enter results from other companies.

It’s a little more complicated than it sounds, though, because labs don’t always test the same markers, and they might present test results differently.

That means you might have to convert your marker values to the format used by the database you want to search. DNA database sites usually have information to help you with this process.

Family Tree DNA’s Ysearch database, for example, has a page to help you enter marker values from other companies. Depending on the company used, you select a marker submission form (Ancestry.com acquired Relative Genetics, so you'd use the Relative Genetics form). Look for red asterisks next to the labels for marker values you’ll need to convert; conversion instructions also are provided.

Ybase’s results submission form also has asterisks that link to a Conversion page.

See our list of these and other public DNA databases, as well as other genetic genealogy reearch helps, in our online DNA toolkit.


genetic genealogy
Thursday, October 09, 2008 3:47:19 PM (GMT Daylight Time, UTC+01:00)  #  Comments [0]
# Friday, July 27, 2007
Learning Your Ethnic Heritage Through DNA
Posted by Diane

Q What's the best source for DNA testing for all ethnic groups?

A It sounds like you’re looking for a DNA test that shows your ethnic heritage, rather than whether you’re related to someone. Several types of tests accomplish this to some degree.

Biogeographical tests
Tests such as DNA Print Genomics’ AncestryByDNA evaluate autosomal DNA, which makes up all your genetic material except for what’s on the XX and XY chromosomes.

AncestryByDNA looks for markers that are characteristic of various groups to estimate your percentages of heritage from four populations: Native American, East Asian, Sub-Saharan African (areas south of the Sahara Desert) and Indo-European (Europe, Middle East, North Africa, Western Asia). The EuroDNA 1 and 2 tests further break down Indo-European heritage.

These tests won’t tell you what country your ancestors came from. Also, there’s a margin of error—most show that in the form of a bar graph with your most likely percentages along with other possible percentages.

Haplogroup tests
Most genetic genealogy laboratories, such as Oxford Ancestry, can test your mitochondrial DNA and assign you to a haplogroup—the genetic group your ancient ancestors (10,000 to 60,000 years ago) belonged to. The haplogroup R1b, for example, is common to Western Europeans.

That’s great to know, but not super-helpful for genealogical purposes because records identifying your ancestors don’t go back 10,000 years. Also, haplogroup information comes from a small section of your tree because you get your mitochondrial DNA from your mother’s mother’s mother’s mother’s (I could go on) mother.

Population comparison tests
Some companies test your DNA and compare certain markers to proprietary databases of DNA results from various populations. You get a report showing which populations your DNA most closely matched. DNAConsulting’s DNA Fingerprint test, for example, compares your sample to a database called Omnipop. You get a list of strongest and "medium-strong" matches, and people with European heritage can get a list of likely country matches.

African Ancestry performs similar comparisons to its database of DNA from African tribes.

Keep in mind the accuracy of these tests is limited by the DNA samples in the comparison database. Not all the world’s diverse populations have been sampled, so your best match may not be a close match at all.

And due to migrations of populations and national boundaries, your DNA could be similar to that of a modern resident of a particular country, but not to that area’s historical population. Since these DNA databases are growing, though, a good match may pop up down the road.

The best genetic genealogy company for you depends on what you want to know, and what you think your ethnicity is (since different companies’ comparison databases may be stronger in different areas). Genetic genealogy experts recognize DNA science is in its infancy, and urge you to back up test results with traditional research. So if a test shows you have DNA markers consistent with American Indians, you wouldn’t consider those results ironclad until you find genealogical records of American Indian ancestors.

For our layperson’s guide to using DNA in your genealogy research, along with DNA testing company contact information, see the October 2006 Family Tree Magazine.


genetic genealogy
Friday, July 27, 2007 2:17:35 PM (GMT Daylight Time, UTC+01:00)  #  Comments [0]