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Table 5 Y- chromosome short tandem repeat (Y-STR) combinations with minimum match probability (MP) for a specified number of Y-STR markers.1

From: Developing criteria and data to determine best options for expanding the core CODIS loci

Number
of loci
Y-STR combinations with minimum MP2 MP KI = 1/MP3
1 15 0.1748 5.72
24 5, 15 0.0477 20.95
3 3, 5, 15 0.0178 56.25
4 1, 3, 5, 15 0.0083 121.1
5 1, 2, 3, 5, 15 0.0045 223.65
6 1, 2, 3, 5, 13, 15 0.0027 372.45
7 1, 2, 3, 5, 9, 13, 15 0.0020 501.29
8 1, 2, 3, 5, 9, 13, 14, 15 0.0016 620.91
9 1, 2, 3, 5, 9, 10, 13, 14, 15 0.0014 711.62
10 1, 2, 3, 5, 8, 9, 10, 13, 14, 15 0.0013 770.27
11 1, 2, 3, 4, 5, 8, 9, 10, 13, 14, 15 0.0012 819.92
12 0, 1, 2, 3, 4, 5, 8, 9, 10, 13, 14, 15 0.0012 847.22
13 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 14, 15 0.0012 866.46
14 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 13, 14, 15 0.0011 876.41
15 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15 0.0011 886.59
16 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 0.0011 891.77
  1. 1This table was generated from the data of Budowle et al [9].
  2. 20 = DYS389I, 1 = DYS389II, 2 = DYS390, 3 = DYS456, 4 = DYS19, 5 = DYS458, 6 = DYS437, 7 = DYS438, 8 = DYS448, 9 = Y GATA H4, 10 = DYS391, 11 = DYS392, 12 = DYS393, 13 = DYS439, 14 = DYS635, and 15 = DYS385.
  3. 3Kinship index (KI) for true paternal lineage is the inverse of MP.
  4. 4For example, in all 2-loci Y-STR haplotype combinations (total 16 × 15 ÷ 2 = 120), the combination DYS458 and DYS385 ('5, 15' in the second row) had the lowest MP.
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