Part 532s – Smith Robertson Genealogy – Smith FTDNA Y-DNA 111 – DYS Values Returned

19 June 2011

Greetings,

The first set of the Smith DNA Y-Chromosome Segment (DYS) values have been returned. These are the results of the Smith Family Tree DNA Y-DNA 111 markers tests. I have included all results in the following listing. But in order to understand what you are looking at, I have found some definitions that may help.

Locus – A specific spot in the genome. A variable locus will have several possible alleles. (From Family Tree DNA)

DYS# – DNA Y-Chromosome Segment (DYS): A nomenclature system which assigns DYS numbers to numbers to newly discovered markers. They are the “names” of each marker. (From Family Tree DNA)

Alleles – One of the different forms of a gene that can exist at a single locus. Since mutations in the allele value occur very slowly with time, one should see the same allele value for a male and his great-grandfather for example. (From Family Tree DNA)


The theory and idea is that one should be able to compare one’s DYS values to other individuals to see how closely or distantly one may have shared a common ancestor. The more DYS markers’ alleles match between two individuals, with the same or variation of a similar surname, the greater the probability that the two individuals may share a common ancestor. (But of course, there could be a chance that the two individuals do NOT share a same surname due to some earlier incidence as adoption, name change, etc..)

The supposed example would be that as any immediate Smith male relative who shares the same common ancestor, great-great-great-grandfather James Smith, one would expect that anyone of them would have the similar allele results. And here are the 111 results.



Locus


1


2


3


4


5


6


7


8


9


10


11


12


DYS#


393


390


19


391


385a


385b


426


388


439


389-1


392


389-2


Alleles


12


24


14


11


11


15


12


12


12


13


13


29



Locus


13


14


15


16


17


18


19


20


21


22


23


24


25


DYS#


458


459a


459b


455


454


447


437


448


449


464a


464b


464c


464d


Alleles


17


9


9


11


11


24


16


19


30


14


15


17


17



Locus


26


27


28


29


30


31


32


33


34


35


36


37


DYS#


460


GATA H4


YCA IIa


YCA IIb


456


607


576


570


CDYa


CDYb


442


438


Alleles


11


11


19


23


15


17


18


18


37


43


13


12



Locus


38


39


40


41


42


43


44


45


46


47


DYS#


531


578


395S1a


395S1b


390


537


641


472


406S1


511


Alleles


11


9


15


16


8


11


10


8


10


11



Locus


48


49


50


51


52


53


54


55


56


57


58


59


60


DYS#


425


413a


413b


557


594


436


490


534


450


444


481


520


446


Alleles


12


23


23


16


10


12


12


14


8


12


22


20


13



Locus


61


62


63


64


65


66


67


DYS#


617


568


487


572


640


492


565


Alleles


12


11


13


12


11


12


12



Locus


68


69


70


71


72


73


74


75


DYS#


710


485


632


495


540


714


716


717


Alleles


34


16


9


16


12


25


26


19



Locus


76


77


78


79


80


82


83


84


85


DYS#


505


556


549


589


522


494


533


636


575


638


Alleles


12


11


12


12


10


9


12


12


10


11



Locus


86


87


88


89


90


91


92


93


DYS#


462


452


445


GATA A10


463


441


GGAAT 1B07


525


Alleles


11


30


12


13


23


14


10


10



Locus


94


95


96


97


98


99


100


101


102


DYS#


712


593


650


532


715


504


513


561


552


Alleles


21


15


19


12


24


19


12


15


24



Locus


103


104


105


106


107


108


109


110


111


DYS#


726


635


587


643


497


510


434


461


435


Alleles


12


23


18


10


14


18


9


11


11

To date I have received notification from Family Tree DNA that there is two matches, Denny and Thomas Seymour whose results may match 63 of my 67 Markers, with a Genetic Distance of 3. This is a fairly close match and does present a great probability of a possible common ancestor. Interpreting the results this may mean that in 20 generations or somewhere in the vicinity of 400 years, or approximately 1611 we could realize a common ancestor.

Now in our case we have a Smith matching against a Seymour… Not possible you say? Most definitely possible. Someone changed the surname. Denny has traced his paternal line to a Richard Seymour who was born approximately 27 January 1605 in Sawbridgeworth, Hertfordshire, England. Per the research, Richard Seymour’s father was Robert Seymer who was born in the same location at about 30 November 1573. Further study has revealed that the surname may have also been written as Seamer and Semer. So bottom line, someone could have changed the name to Smith.

A Genetic Distance, as defined by Family Tree DNA - Genetic Distance is the number of differences, or mutations, between two sets of results. A genetic distance of zero means there are no differences in the results being compared against one another, i.e., an exact match. This is the meaning when comparing Y-chromosome DNA or mitochondrial DNA. This is the computed total, from what I understand of the differences be the alleles from two different test participants. In other word if my Smith Locus 94 of DYS #712 scored "20" and the Seymour's Locus 94 of DYS #712 scored "30", the difference between 20 and 30 is equal to a Genetic Difference of 10.

In the current matching, the case with our Smith and the Seymour participants, the Genetic Distance can be written to say that based on the results there is a greater than 99.41% chance that there may be a common ancestor at about 20 generations or around the year 1611, give or take a few years.

The results of the Smith Y-DNA 111 Markers are in. We are now just waiting for the results to the Seymour Y-DNA 111 testing. With the increased information we will be able to see what the Genetic Distance will be calculated.

Enjoy,

Jim

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