TABLE 1.
piRNA loci in the genome
| High expression in ovary | High expression in testis | |
|---|---|---|
| Genome hits | 673 (60) | 3446 (71) |
| Repeat hits | 502 | 2391 |
| LTR | 105 | 1386 |
| Ngaro1_DR | 86 | 14 |
| LTR1_DR | 0 | 1368 |
| DNA | 72 | 205 |
| TDR2 | 0 | 202 |
| EnSpmN1_DR | 57 | 0 |
| SINE | 0 | 125 |
| SINE3-1 | 0 | 125 |
| LINE | 11 | 41 |
| L1-3_DR | 9 | 1 |
| CR1-4_DR | 0 | 40 |
| Unknown | 308 | 633 |
| Dr001087 | 103 | 0 |
| Dr000417 | 118 | 0 |
| Dr001038 | 0 | 163 |
| Dr000502 | 0 | 141 |
The repeat-associated piRNAs have been split into five categories: those matching LTR, DNA transposons, SINE, LINE, and unknown repeats. piRNA numbers of each group are indicated in parentheses. Categories and abundance of piRNAs differed between testis and ovary, and the testis-specific loci are boldface type. These piRNAs are cloned in this study and from piRNA chip analysis, with remarkable expression difference between testis and ovary.