Aaron Peterson and Hilma (Johnson) Peterson, wedding photograph, photograph 1888, Omaha, Nebraska |
| Analysis of DC1 & Descendants |
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SUMMARY OF YSNP (May, 2016)
Classification of Branch: Fairly broad branch - son of FGC5659. Known sons: Y6913 is the son of DC1 and DC62 is the son of Y6913. Estimated Breadth of branch (speculative estimate of positive submissions): currently around twenty but scope will probably expand some with new testing of YSNPs and improvements in the SAPP tool. Scope of Testing within Signature: Five Big Y tests, two FTDNA SNP packs and two FTDNA individual SNP tests. Dominant Surnames (including variants): O'Brien (13), Dunn (1), Whitney (1), McNamara (1), Normanly (1), Tierney (1), Hart (1) and Morrissey (1). Date that branch was discovered: Unknown. Source of Branch discovery: Five FTDNA Big Y tests (293338, 29355, N142662, 48596 and 338843). Number of Negative Broad Tests: Around 45 Big Y results and 30 more via packs & panels and several more individual YSNP tests. Number of Negative Tests within Signature: None known. Pending Tests (within signature): None known.
ANALYSIS OF CURRENT DC1 HAPLOTREE I manually separated around 120 L226 submissions combined with 36 known YSNP results and then used the SAPP tool to generate a chart which matched the scope found from my manual analysis. As usual, due to lack of the ability to enter more data into the SAPP tool, it is always predicts somewhat larger scope. The SAPP tool did recognize the progression of YSTR mutations and only had a few submissions that did not match my manual analysis. These had no common mutations other than the 481 marker which is known to have many parallel mutations under L226. 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 DC1: 1) Since there was three branches to analyze, I first looked at the signatures of these three branches and determined that there were pretty good signatures associated with these branches. This was enough information to reveal a pretty clear evolution of YSTR mutations. The SAPP did a very good job with all the branching information due to the high testing level of DC1. The scope of DC1 produced by the SAPP was somewhat larger that what manual analysis supports, so around 20 % of the submissions that were predicted DC1 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, several more submissions will be included under the DC1 branch over time. 3) However, between my manual analysis and the SAPP tool, eleven good testing candidates were revealed. Again, the SAPP tool does an excellent job in making the DC1 haplotree much more bushy by finding close matches.
OTHER FUTURE YSNP TESTING No pending tests are known.
DC1 Haplotree The link to the haplotree chart is the best way to look at the evolution of the DC1 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 DC1 branches. Here are the priorities for testing: 1) It is recommended that all current submissions that are predicted positive for the three DC1 branches should test branches according to their position of the haplotree chart. It is recommend that DC1 branches should be tested at $17.50 per YSNP from YSEQ due to much lower costs. Below are the recommended tests of these branches via individual YSNP tests: Predicted DC1+, Y6913- Predicted Y6913+ and DC62 - Predicted DC62+ Partial testing done - predicted DC62+ 2) Once the above testing candidates are confirmed for their status of these DC1 branches, it is recommended that these submissions next test the private YSNPs associated with the NGS tester whose signature they match (in the same branch). These YSNPs will need to added to the YSEQ list of individual YSNPs and can be ordered via the Wish a SNP request form (cost of $1 per YSNP). Once these YSNPs become available for ordering, the first phase of testing for new branches to be discovered (as well as testing new FTDNA branches) would be: For those matching 293338 For those matching 29355 and N142662 Few 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, two YSNPs from FTDNA costs $78 or four YSNPs from YSEQ cost $70 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 DC1 branches by completing the recommended testing listed above. 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 become 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 has 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 any new private YSNPs.
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