SUMMARY OF YSNP (May, 2016)

Classification of Branch: Near Genealogical - son of FGC5660.

Known sons: None

Estimated Breadth of branch (speculative estimate of positive submissions) = currently only four but many are unknown.

Scope of Testing within Signature: No testing within signatures other than Big Y tests.

Dominant Surnames: Farrell (1), Martin (1), Harmon (1) and Hennessey (1) - many more could be added when true scope of branch becomes better known.

Date that branch was discovered: Unknown.

Source of Branch discovery: Two FTDNA Big Y tests (172840 and 260936).

Number of Negative Broad Tests: Around 45 Big Y results and 30 more via packs & panels.

Number of Negative Tests within Signature: None known.

Pending Tests (within signature): None known.

ANALYSIS OF CURRENT DC8 HAPLOTREE

I manually separated around 115 L226 submissions combined with 25 known YSNP results and used the SAPP tool to generate a chart which most of DC8 does not appear to be accurate upon inspection. This branch of L226 has several issues preventing the complete descendant chart of DC8:

1) Both submissions that tested DC8+ have only one common YSTR marker value in the two independent signatures that were used. When manually inspecting these two signatures, no major pattern of YSTR evolution was apparent, so the input to the SAPP tool was lower quality due to limitation of submissions allowed, lack of YSNP testing and lack of genetic diversity of DC8 matches.

2) The current limit of around 100 submissions really limits the accuracy of the desendant chart for this particular L226 branch. The SAPP tool did generate a chart but the DC8 chart was much larger than reality and many submissions were declared positive for DC8 even though they shared one marker mutation that has many parallel mutations under L226.

3) However, the signature associated with the NGS Farrell (172840) submission had a three marker signature that was able to reveal one good testing candidate. The branch created by SAPP for the NGS Martin (260936) signature was a three marker signature and did reveal a another good testing candidate. The SAPP tool generated a pretty large branch for DC8 based on only one mutation but this wider collection of DC8 branches was removed from the final graphic due to its low accuracy.

As the limits of the SAPP are slowly increased, more testing information becomes available (both YSTR submissions and YSNP testing), accuracy will greatly improve. However, the 460 (11>10) mutation that is shared between the two NGS testers is also shared by many other L226 submissions indicating several independant parallel mutations of 460 (11>10).

OTHER FUTURE YSNP TESTING

No pending tests are known.

DC8 Haplotree

The link to haplotree chart is the best way to look at the evolution of the DC8 haplotree. It is visually much easier to follow than spreadsheets and is very close to a genealogist descendant tree charts that genealogists already are well trained in analyzing:

Haplotree of DC8

This summary will attempt to priortize testing and explain why each test is beneficial to the the verification of the DC8 branch.

Here are the priorities for testing:

1) The scope of DC8 is not well known and it is important to determine its scope in order to intelligently know who should confirm DC8 status via individual or pack/panel testing, who should test private YSNPs of the NGS submisisons and who should as best suited for ordering more NGS testing.

2) It is recommended that all current submissions that are predicted DC8 positive should test only DC8 for $17.50 from YSEQ. Once a full analysis can be completed (improvement in SAPP limits, further YSNP testing and completed view of all of L226), many more submissions will probably be moved under DC8 and will become testing candidates.

3) Current predicted DC8 positive testing candidates include:

64029 Harmon
N84242 Hennessey

4) Once these testing candidates are confirmed DC8 positive, it is recommended that these testing candidates should test the private YSNPs associated with NGS testers whose signature matches (in the same branch). In the future, this section will enhance with testing recommendations of private YSNPs.