It is possible, using the basic Y-STR markers tested by a number of commercial companies and other bodies, to get a good idea of whether or not any “R1b” man is likely to be U198 positive. The significant marker values are as follows:
DYS390 = 23
YCAiib = 22
DYS607 = 14
DYS492 = 13
DYS635 = 25 or 26
A combination of all the above (within R1b) indicates a strong probability one is U198 positive.
Unfortunately, not all labs test all five markers. The first three of the above markers are included in a 37-marker test from a well-known commercial company. If an R1b man has all three in combination, including the important (and often overlooked) DSY607 = 14, there is a very good chance he will be U198 positive. We now know that a small group (mainly Morrisons) will have these three marker values (and DYS492 = 13) yet will be U198 negative. However they will almost certainly test positive for the upstream haplogroup known as R-U106, for which an independent project exists.
In early 2008 John Sloan set up a skeleton haplotype on ysearch.org which he calls his “S29 Finder”. Its ysearch ID is FHGJ3. It operates on a “less is more” principle. Here’s how:
The first four Y-STR markers mentioned above are incorporated with five “filler” markers to create a 9-marker haplotype. A search is then performed for exact matches. This is quite effective because exact matches on 8 markers pick up those with 37-marker tests and exact matches on 9 markers (the extra one being DYS492) pick up those with 67-marker tests.
This is only a guide and the result can only be determined with certainty by SNP test.
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