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DYS 390 and DYS 391

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  • DYS 390 and DYS 391

    I have a surname group, related by paper, and the DNA agrees. Mixed in with this group are people with a different surname and one of these 'Mr. Near' matches our surname group except for one marker - DYS 391. Mr. Near has a count of 11 for the marker as do most of his surname, except one that has 12. We have 10, which isn't too common for our haplotype. Dys390 is 22 in both cases. So the question: Is Mr Near really close and we should look up his tree to see if we can find where the two surnames diverged, or is this difference in DYS391 something that divides populations in a more basic way? FTDNA says Mr Near is closer to us that some of us are to each other.

  • #2
    Originally posted by JohnG View Post
    I have a surname group, related by paper, and the DNA agrees. Mixed in with this group are people with a different surname and one of these 'Mr. Near' matches our surname group except for one marker - DYS 391. Mr. Near has a count of 11 for the marker as do most of his surname, except one that has 12. We have 10, which isn't too common for our haplotype. Dys390 is 22 in both cases. So the question: Is Mr Near really close and we should look up his tree to see if we can find where the two surnames diverged, or is this difference in DYS391 something that divides populations in a more basic way? FTDNA says Mr Near is closer to us that some of us are to each other.
    Normally, just two markers isn't enough to be able to determine what you are asking. STR markers can randomly mutate forward or back. How many markers has everyone tested out to?

    Has anyone had more SNP testing other than just down to DF27?

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    • #3
      There are 37 markers (and for some kits 67) the big one that does not match is DYS390. So rephrasing, is there anything about DYS390 that says if we match on 36 of 37 but not on DYS390 we might still not be related in the last few hundred years.

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