Results of chromosome 14 STR typing in the maternal UPD(14) family. Data from markers other than chromosome 14 STRs are not shown
| STR | Coordinate (cM)1-150 | Location | Father | Mother | Proband | Informativity |
| D14S72 | 3 | 14q11.1-11.2 | 1-2 | 2-2 | 1-2 | Paternal allele |
| D14S2831-151 | 7 | 14q11.1-11.2 | 3-3 | 1-1 | 1-2 | Mutated allele |
| D14S80 | 19 | 14q12 | 1-3 | 2-2 | 2-3 | Biparental |
| D14S285 | 47 | 14q13-23 | 1-1 | 2-2 | 2-2 | Maternal UPD |
| D14S290 | 56 | 14q21-22 | 2-2 | 1-2 | 2-2 | — |
| D14S258 | 64 | 14q23-24.3 | 2-3 | 1-1 | 1-1 | Maternal UPD |
| D14S289 | 68 | 14q23-24.3 | 1-1 | 1-1 | 1-1 | — |
| D14S277 | 69 | 14q23-24.3 | 1-2 | 3-4 | 4-4 | Maternal UPD |
| D14S61 | 77 | 14q24.3-31 | 1-2 | 2-2 | 2-2 | — |
| D14S68 | 86 | 14q24.3-31 | 1-1 | 2-2 | 2-2 | Maternal UPD |
| D14S67 | 86 | 14q24.3-31 | 1-3 | 2-4 | 2-4 | Maternal UPD |
| D14S81 | 100 | 14q31 | 1-1 | 1-1 | 1-1 | — |
| D14S267 | 114 | 14q32 | 2-3 | 1-3 | 2-3 | Paternal allele |
↵1-150 The genetic distances and order of markers correspond to the map published by Gyapay et al.19
↵1-151 A mutation seemed to have occurred in the marker D14S283; the proband showed a maternal allele but also an allele that was larger than the paternal ones. We therefore confirmed paternity by typing 14 different STR markers on nine chromosomes other than 14, all of which showed allelic patterns consistent with paternal inheritance (data not shown). Assuming a mutational event, a dinucleotide repeat expansion would have affected the paternal allele. Such length variations may be caused by strand slippage during replication and have been described before.20