Tag Archive | STR

How to figure out what Y SNPs are tested at 23andme

Those of us who are tested at 23andme and have also done the Y STR test at family tree DNA may wonder when some family tree DNA project manager says “Test SNP so and so” whether that SNP is already tested by 23andme. This post explains how to figure that out. If I have already lost you, then this post may just be too technical or else not your cup of tea. To better understand Y testing read this Y lesson by Kelly Wheaton.

For a good explanation of what a STR versus a SNP is, read Roberta Estes’ post – http://dna-explained.com/2014/02/10/strs-vs-snps-multiple-dna-personalities

So to figure out which SNPs my Dad has already tested, I first created the L11 subset image below of the R1b Y haplogroup SNPs from the beautiful diagram created for R1b by Mike Walsh because I need visuals:


Back to the original question. My Dad is an R1b etc and 23andme uses a four year old haplogroup designator rather than the current ISOGG R haplogroup listing. A visitor to this blog suggested that we test DF100 because that is an interesting subclade we may belong to since we have these SNPs according to 23andme: L11/PF6539/S127, L52/PF6541, P310/PF6546/S129, P311/PF6545/S128.

The diagram shows that the possible downstream SNPs for Dad are U106, DF100, and P312. So how to find out if they are tested at 23andme? Since the haplogroup at 23andme shows L52 as the last SNP can I assume the others are tested?

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It’s a Match!! Lars Monsen’s ancestors are found.

The direct male line descendant of Ole Monsen Titland  (1702-1764) is a Y-chromosome DNA 34/37 match to my Dad, who we thought was also a descendant of Ole. Now we know he is!

Thank you so much cousin Sigmund for finding a distant cousin in direct paternal descent to test.

This story was written up a few months back in a post here but we were waiting on the DNA Y-chromosome STR test to prove our theory. Now it is proven.

Here are the deeper details of the three markers that do not match:

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Dad’s 37 STR marker results are in!

Dad’s initial 12 marker STR test showed him to be a classic Western Atlantic Modal Haplotype (WAMH) which meant that he had over 6000 matches at family tree DNA. As you can imagine that was not very useful for finding out which of the many Lars Monsens born around 1781 in the Bergen area might be his g-grandfather. So I spent the money to upgrade him to 37 markers to see if we could do better. Now that the results are in for that, there is only one match four steps away whose most distant paternal ancestor is Swedish. I emailed him yesterday and have not yet heard back. There are also about ten 25 marker matches but they all seem to be English in origin so I have not yet emailed them.

Next step is to use the Ysearch site but it times out on my internet via tethered Blackberry so I will wait until next week for that.

Meanwhile I used the SNPs he was tested for to calculate his Y haplogroup using the latest ISOGG chart and it is R1b1a2a1a1 or R1b-L11*

Look at our test results page to read more about that haplogroup including a number of good links.