Results 1 to 7 of 7

Thread: MyHeritage misses legit 38cM match

  1. #1
    Registered Users
    Posts
    244
    Sex
    Location
    Greece
    Y-DNA (P)
    G-L91
    mtDNA (M)
    T2f2

    MyHeritage misses legit 38cM match

    So I was browsing my 23andMe DNA matches and there's an American guy with whom I share a 37.59cM chunk on chromosome 16 (0,51% of our DNA).



    I browse his results and sure enough, he scores 11,6% "Greek and Balkan" (Greek great-grandfather). Then I'm like "wait, that name seems familiar" and I go to MyHeritage, with which both me and my father have tested. I try to search for his name, no results. Then I switch to my father's profile and there he is, in the first page of his DNA matches. They share 51.6cM, including the same chunk I share with him on 23andMe (actually he shares a bit more on this region with my father).



    Curiously, MyHeritage doesn't give him any "Greek and South Italian" or "Balkan" in his ethnicity estimate, he is 97.4% "North and West European" and the rest "East European" (both of which my father doesn't score at all). But he has a family tree and a list of surnames on MyHeritage and one of them is Greek, which is in line with his 23andMe results.

    I also checked Gedmatch but he doesn't seem to have an account there.

    What could explain this weird disparity? Why is there such a large difference in the SNPs tested for the same chromosome region (4511 on 23andMe VS 13184 on MyHeritage)? I don't care much about finding distant relatives on my genealogical tree but this could be of interest to those who dig into this stuff.

  2. The Following 4 Users Say Thank You to peloponnesian For This Useful Post:

     CyrylBojarski (02-15-2021),  jadegreg (02-14-2021),  lana6765 (02-15-2021),  Rufus191 (03-26-2021)

  3. #2
    Registered Users
    Posts
    2,792
    Sex
    Location
    America
    Ethnicity
    North & Ionian Seas
    Nationality
    American
    Y-DNA (P)
    I1 (P109)

    England Italy Germany Scotland
    interesting. I await to hear what others think is the reason for the miscalculation and missed matching.

  4. The Following User Says Thank You to JerryS. For This Useful Post:

     peloponnesian (02-15-2021)

  5. #3
    Registered Users
    Posts
    244
    Sex
    Location
    Greece
    Y-DNA (P)
    G-L91
    mtDNA (M)
    T2f2

    I found that it's free to upload my 23andMe to MyHeritage so I did that and I'm waiting to see if their algorithm finds the match with the different raw data

    This post wasn't meant as a dig on MyHeritage btw, I think they're a promising company especially for Europeans.

  6. #4
    Registered Users
    Posts
    599
    Sex
    Ethnicity
    English and Irish
    Nationality
    British

    England Ireland Connacht East Anglia England North of England United Kingdom Ireland
    Quote Originally Posted by peloponnesian View Post
    So I was browsing my 23andMe DNA matches and there's an American guy with whom I share a 37.59cM chunk on chromosome 16 (0,51% of our DNA).



    I browse his results and sure enough, he scores 11,6% "Greek and Balkan" (Greek great-grandfather). Then I'm like "wait, that name seems familiar" and I go to MyHeritage, with which both me and my father have tested. I try to search for his name, no results. Then I switch to my father's profile and there he is, in the first page of his DNA matches. They share 51.6cM, including the same chunk I share with him on 23andMe (actually he shares a bit more on this region with my father).



    Curiously, MyHeritage doesn't give him any "Greek and South Italian" or "Balkan" in his ethnicity estimate, he is 97.4% "North and West European" and the rest "East European" (both of which my father doesn't score at all). But he has a family tree and a list of surnames on MyHeritage and one of them is Greek, which is in line with his 23andMe results.

    I also checked Gedmatch but he doesn't seem to have an account there.

    What could explain this weird disparity? Why is there such a large difference in the SNPs tested for the same chromosome region (4511 on 23andMe VS 13184 on MyHeritage)? I don't care much about finding distant relatives on my genealogical tree but this could be of interest to those who dig into this stuff.
    Was it an upload or did you test with MyHeritage?

    I uploaded both 23andme and Ancestry data and got different matches. Some of them were the same and some of them were closer with one kit than the other.

  7. #5
    Registered Users
    Posts
    244
    Sex
    Location
    Greece
    Y-DNA (P)
    G-L91
    mtDNA (M)
    T2f2

    Quote Originally Posted by lana6765 View Post
    Was it an upload or did you test with MyHeritage?

    I uploaded both 23andme and Ancestry data and got different matches. Some of them were the same and some of them were closer with one kit than the other.
    It was a MyHeritage test. I've tested with both 23 and MH, my father only MH.

    My initial post wasn't very clear, sorry. On 23andMe I match on this segment with the other guy, but on MyHeritage only my father matches with him, but it's on the same segment. So I assume MyHeritage messed up with their genotyping/imputation/matching algorithm - or there's a different explanation that I have not thought of

  8. #6
    Registered Users
    Posts
    2,792
    Sex
    Location
    America
    Ethnicity
    North & Ionian Seas
    Nationality
    American
    Y-DNA (P)
    I1 (P109)

    England Italy Germany Scotland
    Quote Originally Posted by peloponnesian View Post
    I found that it's free to upload my 23andMe to MyHeritage so I did that and I'm waiting to see if their algorithm finds the match with the different raw data

    This post wasn't meant as a dig on MyHeritage btw, I think they're a promising company especially for Europeans.
    the raw data transfer from another company vs. an actual spit sample that they decode on their own could be different in their estimation of things. however, the matches should still be the same.

  9. #7
    Registered Users
    Posts
    244
    Sex
    Location
    Greece
    Y-DNA (P)
    G-L91
    mtDNA (M)
    T2f2

    Quote Originally Posted by JerryS. View Post
    the raw data transfer from another company vs. an actual spit sample that they decode on their own could be different in their estimation of things. however, the matches should still be the same.
    Yeah, it's possible he didn't actually test with MyHeritage and just transferred from 23 so the imputed data may have some wrong calls (?). But then how he does match with my father on MH?

  10. The Following User Says Thank You to peloponnesian For This Useful Post:

     Rufus191 (03-26-2021)

Similar Threads

  1. how legit is mytrueancestry?
    By SlytherclawRavenpuff in forum General
    Replies: 17
    Last Post: 07-13-2019, 07:34 PM
  2. Replies: 30
    Last Post: 06-23-2019, 12:13 PM
  3. Ancestry Match doesn't Match on GEDmatch?
    By greerpalmer in forum AncestryDNA
    Replies: 1
    Last Post: 10-03-2018, 09:54 PM
  4. Is my 0.4% Ashkenazi ancestry legit?
    By name1000 in forum Autosomal (auDNA)
    Replies: 1
    Last Post: 08-31-2017, 03:03 AM
  5. Hoping for a Y-DNA Match from a Family Finder Match
    By rms2 in forum Stevens/Stephens Surname Project
    Replies: 10
    Last Post: 10-31-2014, 03:30 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •