Is a Y-STR match valid?

Two-thirds of Taylor Family Genes project members are in subclades of R1b1a2a1a (R-M269 < R-P310, see note below) About 10% of these have coincidental matches, which may not indicate shared paternal ancestry within genealogic time.

This page is about validating -- or more precisely, invalidating -- such matches.

Although this page is specifically for R-M269, the approach is applicable to other haplogroups as well.

To see if a STR match is not valid, check to see if tested SNPs conflict. We are looking for the phylogenetic relationships of the SNPs at the finest haplogroup/subclade level discernible from the test data. Is one SNP upstream or downstream of the other or are they in separate branches?

  1. Check SNPs of each member of the close-matching pair. Both must have tested positive for SNPs listed in a  column of the table below; if not, this tool can not be used.
  2. If one member has an SNP in the pink column and the other has a SNP in the green column, the match is invalid.
  3. If both have SNPs in the same column, both must be in same subclade, for the match to be valid, e.g.,
    1. L20 and L21 or M228.2 are not inconsistent. L21 is in a subclade of L20 and M228.2 is in s subclade of L21.
    2. M126 and M160 are in conflict; they are in different subclades, ..1b3a and ..1b3b

A match is not necessarily valid if this tool fails to identify it as invalid. However, the chances are reduced.

YCC (FTDNA) Subclades of R1b1a2 a1a
U106 ..1a* P312 ..1b*
U198 ..1a1 M65 ..1b1
P107 ..1a2 M153 ..1b2
L1 ..1a3 U152 ..1b3
L48 ..1a4 M126 ..1b3a
 L47 ..1a4a M160 ..1b3b
 L44/L163..1a4a21 L2 ..1b3c
 L46 ..1a4a1a L20 ..1b3c1
  L164..1a4a1a1 M228.2 ..1b3c1a
 L148..1a4a4b L196 ..1b3c2
L188..1a4a4c L4 ..1b3d
L6..1a5 L21 ..1b4
P89.2..1a6 M27 ..1b4a
L217..1a7 M222 ..1b4b
L257..1a8 P66 ..1b4c
L325..1a9 L96 ..1b4d
L144/L196 ..1b4e
  L159.2 ..1b4f
L193 ..1b4g
L226 ..1b4h
P314.2 ..1b4i
L176.2 ..1b5
SRY2627 ..1b5a
L165 ..1b5b
* Note: Be aware of recent changes in the R1b1a2a1a phylogenetic tree, due to continuing scientific discoveries. The more recently updated phylogeny is the ISOGG tree ot the Y-Full tree. FTDNA uses the 2010 Y-Chromosome Consortium (YCC) tree, with some additions; the nomenclatures are not entirely consistent with each other.
In the FTDNA tree (used above), subclades of R-U106 are R1b1a2a1a1a and subclades of R-P312 are R1b1a2a1a1b. In the more up-to-date ISOGG tree (below), R-U106 subclades are R1b1a2a1a1 and R-P312 subclades are R1b1a2a1a2.

ISOGG Tree of R1b1a2a1a,
as of April 2014
SNPs Phylogenetic - SNPs Phylogenetic.
M405/S21/U106 ..1 P312 ..2
L217.1/S1849.1 ..1a DF27/S250 ..2a
S493/YSC000053/Z18, Z19 ..1b S227/Z195, S355/Z196 ..2a1
Z14 ..1b1 S230/Z209, S356/Z220 ..2a1a
S375/Z372 ..1b1a Z216, S181/Z278 ..2a1a1
L257/S186 ..1b1a1 S348/Z214 ..2a1a1a
DF95/S21484 ..1b1b M153 ..2a1a1a1
S263/Z381 ..1c L176.2/S179.2 ..2a1b
S264/Z156 ..1c1 Z262 ..2a1b1
S265/Z304, S376/Z305, S497/Z306, S498/Z307 ..1c1a M167/SRY2627 ..2a1b1a
DF98 ..1c1a1 L165/S68 ..2a1b2
L128/PF3499 ..1c1a1a CTS4188 ..2a1b3
DF96/S1809 ..1c1a2 DF17/S455 .2a1c
L1/S26 .1c1a2a L617 ..2a2
P89.2 ..1c1a2b L881 .2a3
S499 ..1c2 PF6570/S28/U152 .2b
M467/S29/U198 ..1c2a L2/S139 ..2b1
L48/S162 ..1c2b S255/Z367 ..2b1a
L47/S170 .1c2b1 L20/S144 2b1a1
L44/S171, L163/S352 .1c2b1a S368/Z34 ..2b1a2
L46/S172 ..1c2b1a1 S487/Z35 ..2b1a2a
L45/S353, L164/S502, L237, L477, L493 ..1c2b1a1a Z275 ..2b1a2a1
Z159, Z160, Z350 ..1c2b1b L196 ..2b1b
S268/Z9, S379, S504/Z28, Z348 ..1c2b2 Z49 ..2b1c
S271/Z30 ..1c2b2a S211/Z142 ..2b1c1
S511 ..1c2b2a1 L562/S213 ..2b1c1a
S272/YSC0000049/Z7, S509/Z31 ..1c2b2a1a S206/Z36 ..2b2
S384/YSC000047YSC000050/Z8, Z21, Z22, Z24, Z25, S517/Z26, Z29, S516/Z351 ..1c2b2a1a1 PF6601/Z56 ..2b3
S274/Z11 ..1c2b2a1a1a L4/S178 ..2b3a
S385/Z12 ..1c2b2a1a1a1 S47 ..2b3b
L148/S173 ..1c2b2a1a1a1a Z144, PF6578/S371 ..2b3c
S275/YSC0000043/Z1 ..1c2b2a1a1b L21/M529/S145, L459, S461 ..2c
S514/Z344 ..1c2b2a1a1 b1 CTS241/DF13/S521 ..2c1
S276/Z6 ..1c2b2a1a1 b1a DF49/S474 ..2c1a
S512/Z346 ..1c2b2a1a1 b2 DF23/S193 ..2c1a1
S387/Z343 ..1c2b2a1a1 b2a Z2961 ..2c1a1a
CTS7080/S3334 ..1c2b2a1a1 b2a1 M222/Page84/ USP9Y+3636 ..2c1a1a1
DF101 ..1c2b2a1 a1b2b DF85/S675 ..2c1a1a1a
DF102 ..1c2b2a1a1 b2b1 DF1/L513/S215 ..2c1b
M365.4 ..1c2b2a1a 1c P66_1, P66_2, P66_3 ..2c1b1
CTS10893/S3595 ..1c2b2a1a2 L193.1/S176.1 ..2c1b2
S1743/Z331, Z334, Z347 ..1c2b2b L706.2 ..2c1b3
S505/Z330 ..1c2b2b1 L705.2/S465.2 ..2c1b3a
Z326, S380/Z329, Z337 ..1c2b2b1a CTS3087 ..2c1b4
CTS2509/S1734, S1741/Z319, Z325 ..1c2b2b1a1 L96 ..2c1c
L200 ..1c2b3 L144.1/S175, L195/S354 ..2c1d
L199.1 ..1d S219/Z255 ..2c1e
L159.2/S169.2 ..2c1e1
S218/Z253 ..2c1f
L554 ..2c1f1
S686 ..2c1f2
L226/S168 ..2c1f2a
L643 ..2c1f2b
S893 ..2c1f2c
CTS1202.1/L1066.1 ..2c1f2c1
CTS9881 ..2c1f2c1a
DF73/S923 ..2c1f2d
PF825.2 ..2c1f3
DF21/S192 ..2c1g
P314.2/S220.2 ..2c1g1
L362 ..2c1g1a
S280/Z246 ..2c1g2
DF25/S253 ..2c1g2a
DF5/S191, S281/Z248 ..2c1g2a1
L658 ..2c1g2a1a
CTS3655/S3787 ..2c1g2a1b
L627 ..2c1g2a1b1
L1402 ..2c1g2a1c
L720/S299 ..2c1g3
S3058 ..2c1g4
S423<, S424, S426, S3025, S3026, S3031, S3057 (See Notes regarding S423) ..2c1g4a
CTS2187/S190, CTS9333/S307, S301, S308, S309, S427, S3027, S3028, S3034 (See Notes regarding S3028) ..2c1g4a1
S425, S3033 ..2c1g4a1a
L130 ..2c1g5
L371/S300 ..2c1h
CTS2501/S836, CTS6581 ..2c1i
L744/S388, L745/S463, L746/S310 ..2c1i1
L563 ..2c1i2
S470 ..2c1j
L555/S393 ..2c1j1
L1335/S530 ..2c1k
CTS6838, CTS7030/S735, CTS11722/L1065/S749 ..2c1k1
L743 ..2c1k1a
CTS4466/S1136 ..2c1l
L270.2 ..2c1l1
CTS2457.2 ..2c1m
L679 ..2c1n
CTS300 ..2c2
CTS6919/S3689 ..2c2a
L238/S182 ..2d
DF19/S232 ..2e
DF88/S4298 ..2e1
L644 ..2e1a
L1199 ..2e1b
L719 ..2e1c
S233/Z302 ..2e2
DF99/S11987 ..2f