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Number of piRNAs in each chromosome of four organisms


Chromosome number Homo sapiens Mus musculus Rattus norvegicus Drosophila melanogaster
Unique piRNAs Total number of unique mappers Unique piRNAs Total number of unique mappers Unique piRNAs Total number of unique mappers Unique piRNAs Total number of unique mappers
1 1758 56222 1516 102358 6942 128965 - -
2 1673 48125 4033 94772 1140 135479 - -
3 1512 39470 1293 85213 3996 71539 - -
4 1153 33695 3044 89364 3916 90407 1875 3295
5 1167 35366 4349 81677 2809 87923 - -
6 2592 36102 3925 78508 2176 67245 - -
7 1326 36860 5439 80773 3365 67399 - -
8 1131 26920 1831 63670 3260 49807 - -
9 1986 29856 4584 62083 1628 47113 - -
10 1707 29982 3381 69094 1022 37980 - -
11 1959 29012 1691 58831 775 42071 - -
12 1536 32041 2491 61886 3053 17013 - -
13 818 16822 1517 60274 686 51553 - -
14 1152 20569 2553 64493 563 49084 - -
15 3970 28108 3723 55037 1159 47438 - -
16 1259 23766 868 50072 434 36614 - -
17 1615 30872 4529 52547 1384 37319 - -
18 1012 13754 2463 44246 1353 38591 - -
19 2021 28528 839 27194 1120 20553 - -
20 740 14826 - - 5142 27815 - -
21 657 6935 - - - - - -
22 1445 13697 - - - - - -
X 782 31758 935 115384 521 117396 8651 38856
Y 385 4658 355 2337 - - - -
2L - - - - - - 7066 37316
2R - - - - - - 11788 43384
3L - - - - - - 8658 45374
3R - - - - - - 6379 35164



piRNA Dataset

Organism Human Mouse Rat
Total number of sequences downloaded from NCBI 11147151 6943119 1334465
Sequences from literature (Supplementary data) 1005 4045 -
Number of piRNAs after extensive redundancy removal (contigs, clones, repetitive sequences) 32194 72878 62713
Sequences which mapped with the genome 32194 58320 55442
Final piRNAs in piRNABank after further removal of redundancy (similar sequences mapping to the genome) 23439 39986 38549
Unique mappers on the genome 19260 35796 34243
Total positions mapped on the genome (including sequences mapping to single and multiple loci) 667944 1399813 1269304



Length distribution of piRNAs

length



Number of piRNA clusters in Human, Mouse and Rat

Chromosome number Homo sapiens Mus musculus Rattus norvegicus Drosophila melanogaster
1 5 5 45 -
2 1 9 15 -
3 3 4 14 -
4 3 13 17 17
5 2 6 9 -
6 4 8 11 -
7 6 9 15 -
8 1 3 3 -
9 12 5 7 -
10 2 12 7 -
11 3 1 4 -
12 5 1 4 -
13 1 7 4 -
14 2 8 4 -
15 16 5 2 -
16 3 0 1 -
17 7 6 4 -
18 1 3 4 -
19 5 1 3 -
20 1 - 3 -
21 1 - - -
22 4 - - -
X 1 4 13 103
Y 0 1 - -
2L - - - 106
2R - - - 98
3L - - - 122
3R - - - 123
Total 89 111 189 569