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 a 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 Haplogroup R) indicates a strong probability one is U198 positive.
All of these markers are tested in the 111 marker test available from Family Tree DNA. The first three of the above markers are included in a 37-marker test from the same company and in the Alpha-Beta Y-STR panel from YSEQ (who also offer an extensive array of standalone SNP tests). If a “Haplogroup R” 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. A minority of men 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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