Picton Y-DNA

STR and SNP

Testing and Research


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Y CHROMOSOME DNA TESTING

STR stands for short tandem repeat haplotypes. For example, kit B291 and B125 have allele values of 29 and 28 respectively at DYS389II. This is a difference of 1 (29-28= 1). Because this is the only difference in their Y-DNA12 profiles (haplotypes), their genetic distance is 1.

SNP markers: A single nucleotide polymorphism (SNP) is a change to a single nucleotide in a DNA sequence. The relative mutation rate for an SNP is extremely low. This makes them ideal for marking the history of the human genetic tree. SNPs are named with a letter code and a number. The letter indicates the lab or research team that discovered the SNP. The number indicates the order in which it was discovered. For example M173 is the 173rd SNP documented by the Human Population Genetics Laboratory at Stanford University, which uses the letter M


FTDNA have recently placed the next line update on their website.

https://blog.familytreedna.com/y-dna-haplotree-reaches-50000-branches/


We recommend that you test at Family Tree DNA for STR markers because we have an established Picton Project there and there is a discount involved. A DNA test will indicate if you belong to the Picton families from Pembrokeshire. Please help and contribute to our family knowledge pool by contacting us and sharing what information you know about your own Picton family connections. We have DNA results from some Picton families with origins other than Wales.

We strongly recommend also that you begin by testing your Y-DNA initially first for the 37 STR markers offered by FTDNA. An additional Deep Ancestry test for the SNP L46 at FTDNA; is an additional option if you have been tested at these STR markers. Picton families from Pembrokeshire should all tests positive for this SNP as the lowest downstream Haplogroup marker. At present this is the deepest SNP applicable to the Picton surname families of Welsh origin. If you test for this SNP, you can also join the R1b-U106/S21+ Project at FTDNA which is a Yahoo Groups Forum dedicated to discussion on the origins and downstream markers from this SNP. To view FTDNA

You may match the DNA of the Picton families from Wales if you match the two STRs shown below and your last name is Picton:

STR385b=13

YCAIIa=21

If your last name is not Picton, you must also test positive for the SNP L46.

Currently 11 members belonging to the Picton Surname Project show a connection to Wales. Three other members show a totally different origin of the surname and two members are connected to Wales according to the paper records, but this is not confirmed by their DNA test results.

You should join ysearch if you have STRs tested at either company.

Picton Y-DNA Research SNP Results

The PICTON Family DNA Haplogroup was R1b1b2a1a4 (ISOGG Tree, 2009)

and now is R1b1a2a1a1c2b1a1a1a (ISOGG Tree, 2014) or called R-L493 or R-L477

The Picton Family from Wales belong to the R1b Haplogroup and in addition test positive for the following SNPs:

U106/S21+, Z381+, L48+, L47+, L44+, L46+, L525+, L45+ and L493+

A Deep-R SNP subclade test for Owen Samuel Picton was made by Ethnoancestry and by Family Tree DNA (FTDNA). These tests showed the Picton families from Wales to be part of the R1b-M269 subclade called Haplogroup R1b-U106 (or R1b-U106/S21+). This was previously known as Haplogroup R1b1c9*, then Haplogroup R1b1b2g and then R1b1b2a1a*. A convenient way to describe these Haplogroups is just to use the last SNP marker which tests positive. On this basis the Picton Haplogroup is R-L493 or R-L477. An age estimate for the R-L48 ancestor is about 2661 BC (2199 BC - 1740 BC).

The Haplogroup SNP test results from FTDNA shows the Picton family tests positive for markers levels U106, Z381, L48, L47, L44, L46, L525, L45 and L493. The Picton family has a Haplogroup currently assigned as R-L493 or R-L477 because both test to the same lowest level. This Haplogroup designation may change when names are given for any new SNPs discovered. An evolving nomenclature is to name the Haplogroup after the last SNP in the descent tree. In this case it would be R-L493 or R-L477. If you are R-L493 then your are R-L477.