Sarah (Brooks) Dimon, photograph ca. 1905, Columbus, GA |
| Analysis of DC25 & DC26 |
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SUMMARY OF YSNP (May, 2016)
Classification of Branch: Fairly broad branch - son of FGC5660. Known sons: DC26 is the son of DC25. Estimated Breadth of branch (speculative estimate of positive submissions): currently around twelve but scope will probably expand some with new testing of YSNPs and improvements in the SAPP tool. Scope of Testing within Signature: Three Big Y tests, one FTDNA SNP pack and one Big Y test at 37 markers that could not be used in the analysis due to missing markers 38 to 67. Dominant Surnames (including variants): Mahoney (2), Jennings (2), Bryant (1), O'Brien (1), Reily (1), Ryder (1), Calahan (1), Knox (1), Snead (1) and McCrea (1) - several more could be added when true scope of branch becomes better known. Date that branch was discovered: Unknown. Source of Branch discovery: Three FTDNA Big Y tests (106428, 169471 and N56434). 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 DC25 HAPLOTREE I manually separated around 116 L226 submissions combined with 27 known YSNP results and then used the SAPP tool to generate a chart which matched the scope found from my manual analysis (it is always somewhat larger due to the 100 submission limit). The SAPP tool seemed to recognize the progression of YSTR mutations but produced several errors that had to be corrected. However, the SAPP did its usual excellent job of identifying many close matches that were included in the haplotree. This branch of L226 has several issues preventing the complete descendant chart of DC25: 1) The four submissions that tested for DC25 have a very strong shared YSTR signature that has pretty clear evolution of YSTR mutations. The original three marker signature was shared by all submissions and two were based on double mutations that yielded even more YSTR branches. The scope of DC25 produced by the SAPP is very reasonable in scope but around 10 % of the submissions that were predicted DC25 positive were removed due to lack of much commonality with any other tested submissions. 2) The current limit of around 100 submissions limits the accuracy of the descendant chart for this particular L226 branch. As more submissions can be entered into the SAPP tool, as new branches are discovered and as more YSNPs are tested, a several more submissions will be included under the DC25 branch over time. 3) However, between my manual analysis and the SAPP tool, eight good testing candidates were revealed.
OTHER FUTURE YSNP TESTING No pending tests are known.
DC25 Haplotree The link to the haplotree chart is the best way to look at the evolution of the DC25 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:
Testing Candidate Recommendations
This summary will attempt to priortize testing and explain why each test is beneficial to the the verification of the DC25 branch. Here are the priorities for testing: 1) The scope of DC25 is fairly well known but its scope should increase some when more submissions are allowed by the SAPP tool and when more genetic information becomes available over time via more YSNP testing and new 67 marker submissions. 2) It is recommended that all current submissions that are predicted DC25 or DC26 positive should test both DC25 and DC26 for $35.00 from YSEQ. Below are the recommended tests of these branches via individual YSNP tests (all should test both unless already tested): DC25+ & DC26- predicted DC25+ & DC26+ predicted 3) Once these testing candidates are confirmed for their status of DC25 and DC26, it is recommended that submissions nest test the private YSNPs associated with their NGS submissions whose signature matches (in the same branch). These YSNPs will need to added to the YSEQ list of individual YSNP via the Wish a SNP request form (cost of $1 per YSNP). Once these YSNPs become available for ordering, the first phase of testing would be: For those predicted DC25+ & DC26- AND are 576=19 & 447=23 For those predicted DC25+ & DC26- AND are 449=30 & 576=19 None of these new YSNPs are currently available for order from FTDNA as individual YSNP orders and I can not verify if they are orderable via the haplotree interface since I test negative for their ancestral YSNP. However, even if they are available for ordering, one YSNP from FTDNA costs $39 or three YSNPs from YSEQ cost $52.50 and could discover a new branch vs. just testing a new branch that FTDNA has added. Private YSNPs should not be ordered unless you have confirmed the results of DC25 and DC26 via testing of these two YSNPs. After the first phase of testing private YSNPs, additional private YSNPs will be recommended during phase two of testing private YSNPs. As test results for these private YSNPs are known, the recommended list will change over time based on the testing results received. Testing private YSNPs is speculative testing for the discovery of new branches as well as confirming known branches - discovery of new branches have similar risks as the Big Y test but at much lower costs. However, Big Y testing will always discover yet more private YSNPs where testing existing private YSNPs will never discover new private YSNPs.
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