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Y-DNA Haplogroups & SNPs Advanced Users can talk about SNP based tests such as single SNP testing by Sanger sequencing, Geno 2.0 chip based testing, and next-generation sequencing tests like BIG Y.

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  #11  
Old 1st March 2017, 08:17 AM
Armando Armando is offline
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Join Date: Jun 2009
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Originally Posted by cnegueruela View Post
Thank you very much, Armando. This is was looking for. However since you're suggesting BigY I'm going to look at it into detail before deciding. I admit I'm not that familiar with what the outcomes of the BigY test are... Are all SNPs tested then?
Almost all SNPs are tested with BigY. SNP Packs just test some of the known SNPs downstream from Z209. I think the best way to explain the BigY is with examples of results of kits with BigY testing. The BigTree and YFull are sites that analyze BigY test results. Two Z295 people that had a BigY test and a 1000 Genomes anonymous sample, kit HG01521, are in the BigTree at http://www.ytree.net/DisplayTree.php?blockID=1930 and in the YFull tree at https://www.yfull.com/tree/R-PF7203/ Even though the Z209 SNP Pack tests all the way down to PF7203 it doesn't test all of the equivalent SNPs and some equivalent SNPs are so new they don't even have names yet which is why the BigTree just shows their positions. The new SNPs without names are novel SNPs and those aren't included in any SNP pack yet and the only reason we know about them is because of the BigY testing. There are more SNPs that each person has which are private SNPs and will never get a name. The only way novel and private SNPs are tested is with BigY. The novel and private SNPs are used by YFull to provide a TMRCA and those two people in the links have a TMRCA of 2100 years before present. Once more people get tested with BigY and someone share more SNPs with one of them then some of the private SNPs will become novel SNPs and get names and the TMCRA will be younger.

The downside of BigY is that it is possible that your father doesn't match anyone at BigTree or YFull and he is negative for all downstream SNPs from Z295 like the two people at https://www.yfull.com/tree/R-Z295*/ and http://www.ytree.net/DisplayTree.php?blockID=631 but at least almost all possible SNPs would have been tested and not just the SNPs included in the SNP pack.

If your father has had a Y67 or Y111 test and has a close STR match at 67 or Y111 and both the your father and the match get a BigY test and they both get a YFull analysis then they should get a fairly young TMRCA.
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  #12  
Old 11th March 2017, 02:45 PM
bpardy bpardy is offline
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Join Date: Oct 2016
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Originally Posted by Armando View Post
The downside of BigY is that it is possible that your father doesn't match anyone at BigTree or YFull and he is negative for all downstream SNPs from Z295 like the two people at https://www.yfull.com/tree/R-Z295*/ and http://www.ytree.net/DisplayTree.php?blockID=631 but at least almost all possible SNPs would have been tested and not just the SNPs included in the SNP pack.

If your father has had a Y67 or Y111 test and has a close STR match at 67 or Y111 and both the your father and the match get a BigY test and they both get a YFull analysis then they should get a fairly young TMRCA.
As one of those two Z295* people on the Big Tree, I have to urge anyone with an apparent terminal SNP of Z295 to pursue BigY testing and share their results if possible. I believe we have a lot of hidden structure to find below Z295 and more data will help with that. My paternal line goes back to France and does not seem particularly rare, just low on people that have tested.

Good luck!
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