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btree
06-12-2020, 07:59 AM
Through 23andme's genetic testing, my paternal haplogroup has been identified as I-Z74. Apparently it's pretty rare among their customers, with only 1 in a quarter million having it. My father's father's side is still quite unknown but I do know that he comes from Scandinavia and probably has Ashkenazic Jewish ancestry. Does anyone else here have this haplogroup and what information/history do you have on it?

deadly77
06-12-2020, 10:17 AM
Welcome to the Anthrogenica forums. I wouldn't place too much faith in 23andme's reporting of whether a haplogroup is common or rare as their numbers seem well off in that regard. It's certainly the case in mine where they told me that I-M253 was "very common" among 23andme customers (1 in 14) when I first got my results but now tell me that I-M253 is "extremely rare" among 23andme customers (1 in 25000).

I'm not I-Z74 myself, but you might want to familiarize yourself with the YFull tree for I-Z74 https://www.yfull.com/tree/I-Z74/, which gives you an idea of the subclades below I-Z74. It seems that most I-Z58 folks fall into either the I-L813 or I-CTS2208 branches but 23andme doesn't include those SNPs on their testing chip, so can't verify if you are on one of those branches or not.

There is a Facebook group for I-Z74 here https://www.facebook.com/groups/2119624018123813/ but only has 12 people in it and I'm not sure how active it is.

Modern distribution (self reported from testers) appears rather Northern Scandinavia with highest numbers from Finland, Sweden, Norway and a smattering from elsewhere. However, the majority of kits reporting Finland are in the I-L258 branch (although not all) and they are well represented in testing databases which skews the statistics a bit. 23andme does test for the SNP L258 on their chip, so if you're negative for L258 per your 23andme test then you can rule out a decent size branch.

There are a few examples of I-Z74 or below in the ancient samples. I've compiled these into a Google map and the link is in below in my signature. Click on one of the pins or the sample name in the list on the left hand side for more info. The ones you may want to look from a I-Z74 perspective are:

HSJ-A1 I-Y111864 Hrˇlfssta­ir, Iceland
SSJ-A2 I-Z74 Surtssta­ir Iceland
84005 I-CTS2208 Sigtuna, Sweden
VK291 I-Z74B°dkergarden, Denmark
VK98 I-L813 Hofsta­ir, Iceland
VK382 I-L813 Íland, Sweden
VK529 I-L813 Ledingen, Norway
VK547 I-L813 Tjelsundet, Norway

There are a few more samples that may be I-Z74 from the Population Genetics of the Viking World preprint that came out last year. But the raw data isn't available for these samples yet and so I've listed them upstream at I-L22, I-Z2336, I-DF29, etc. on the map.

neumarcx
11-17-2020, 11:55 AM
Thank you for the mention deadly77. I've started the group in 2019 and we now have 29 members. btree if you haven't done so already feel free to join we have some tips for 23andMe users.

https://www.facebook.com/groups/2119624018123813/


Welcome to the Anthrogenica forums. I wouldn't place too much faith in 23andme's reporting of whether a haplogroup is common or rare as their numbers seem well off in that regard. It's certainly the case in mine where they told me that I-M253 was "very common" among 23andme customers (1 in 14) when I first got my results but now tell me that I-M253 is "extremely rare" among 23andme customers (1 in 25000).

I'm not I-Z74 myself, but you might want to familiarize yourself with the YFull tree for I-Z74 https://www.yfull.com/tree/I-Z74/, which gives you an idea of the subclades below I-Z74. It seems that most I-Z58 folks fall into either the I-L813 or I-CTS2208 branches but 23andme doesn't include those SNPs on their testing chip, so can't verify if you are on one of those branches or not.

There is a Facebook group for I-Z74 here https://www.facebook.com/groups/2119624018123813/ but only has 12 people in it and I'm not sure how active it is.

Modern distribution (self reported from testers) appears rather Northern Scandinavia with highest numbers from Finland, Sweden, Norway and a smattering from elsewhere. However, the majority of kits reporting Finland are in the I-L258 branch (although not all) and they are well represented in testing databases which skews the statistics a bit. 23andme does test for the SNP L258 on their chip, so if you're negative for L258 per your 23andme test then you can rule out a decent size branch.

There are a few examples of I-Z74 or below in the ancient samples. I've compiled these into a Google map and the link is in below in my signature. Click on one of the pins or the sample name in the list on the left hand side for more info. The ones you may want to look from a I-Z74 perspective are:

HSJ-A1 I-Y111864 Hrˇlfssta­ir, Iceland
SSJ-A2 I-Z74 Surtssta­ir Iceland
84005 I-CTS2208 Sigtuna, Sweden
VK291 I-Z74B°dkergarden, Denmark
VK98 I-L813 Hofsta­ir, Iceland
VK382 I-L813 Íland, Sweden
VK529 I-L813 Ledingen, Norway
VK547 I-L813 Tjelsundet, Norway

There are a few more samples that may be I-Z74 from the Population Genetics of the Viking World preprint that came out last year. But the raw data isn't available for these samples yet and so I've listed them upstream at I-L22, I-Z2336, I-DF29, etc. on the map.