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FTDNA Discover Tree and Ancient DNA

Nigel B All Messages By This Member #19 开云体育 Greetings S16264s Sylvain Leprovost recently asked me whether FTDNA’s Discover Tree includes DNA recovered from ancient human remains found in archaeological investigations. ?I thought other S16264s might be interested too so am copying and expanding on my answers below: Ancient human remains found in excavations are increasingly DNA tested if judged likely to have DNA preserved.? There have also been several special research projects which have DNA tested large numbers of individuals’ remains from museum collections. ?These individuals’ remains will also have been carbon-14 dated so providing a latest date by which the DNA SNPs found in the individual samples occurred for the first time. ? FTDNA have included some ancient individuals in their Discover tree but not all.? To see some of them scroll up the Discover tree on your Discover Time Tree web page using the arrow next to R-S16264 and continue scrolling until you reach the page with R-DF13.? The brown trowel symbols are for ancient DNA.? Scroll down that webpage to see many more.? Note the branching SNP upstream of each individual is the youngest SNP found in their DNA: they may in life have carried more recent known branching SNPs but these were either not recovered from the sample or were not identified in the test. Scrolling down you will see most ancient individual’s dates are more recent than the date of the branching SNP they are descended from. ?Occasionally some individual’s dates appear to be older than their branching SNP (their trowel symbol is located to the left of their branch). ?This is of course not possible in reality but indicates that particular SNP is older than FTDNA’s estimate. ?However the date of the branch in the tree may still be an accurate estimate: the apparent inconsistency occurs because FTDNA have not chosen the youngest SNP in a long ‘block’ of SNPs to identify the block and hence the name of the branch. Please let me know if you have questions. Best wishes Nigel
Steve Turner All Messages By This Member #20 Thanks for this interesting info, Nigel!? No questions until I try to check it out as directed...? Steve toggle quoted message Show quoted text ----- Original Message ----- From: Nigel B via groups.io (jnigelbond@...) Date: 02/05/23 00:08 To: [email protected] Subject: [s16264] FTDNA Discover Tree and Ancient DNA Greetings S16264s Sylvain Leprovost recently asked me whether FTDNA’s Discover Tree includes DNA recovered from ancient human remains found in archaeological investigations. ?I thought other S16264s might be interested too so am copying and expanding on my answers below: Ancient human remains found in excavations are increasingly DNA tested if judged likely to have DNA preserved.? There have also been several special research projects which have DNA tested large numbers of individuals’ remains from museum collections. ?These individuals’ remains will also have been carbon-14 dated so providing a latest date by which the DNA SNPs found in the individual samples occurred for the first time. ? FTDNA have included some ancient individuals in their Discover tree but not all.? To see some of them scroll up the Discover tree on your Discover Time Tree web page using the arrow next to R-S16264 and continue scrolling until you reach the page with R-DF13.? The brown trowel symbols are for ancient DNA.? Scroll down that webpage to see many more.? Note the branching SNP upstream of each individual is the youngest SNP found in their DNA: they may in life have carried more recent known branching SNPs but these were either not recovered from the sample or were not identified in the test. Scrolling down you will see most ancient individual’s dates are more recent than the date of the branching SNP they are descended from. ?Occasionally some individual’s dates appear to be older than their branching SNP (their trowel symbol is located to the left of their branch). ?This is of course not possible in reality but indicates that particular SNP is older than FTDNA’s estimate. ?However the date of the branch in the tree may still be an accurate estimate: the apparent inconsistency occurs because FTDNA have not chosen the youngest SNP in a long ‘block’ of SNPs to identify the block and hence the name of the branch. Please let me know if you have questions. Best wishes Nigel

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