1.
List of small RNAs and their function
| Type | Role | Size (nt) | Reference |
| Scan RNAs (scnRNA) | Genome rearrangement, chromosome segregation, meiotic prophase | ~29 | 61, 62 |
| Small nuclear RNA (snRNA) | Splicing (removal of introns from genes) | 120–300 | 63 |
| Small nucleolar RNA (snoRNA) | rRNA processing | Variable 87–275 | 64-66 |
| Repeat-associated siRNA (rasiRNA) | Silencing of genetic repeat | ~24–26 | 67-69 |
| Transacting short interference RNA (tasiRNA) | Post -transcriptional gene regulation | ~21 | 67, 70 |
| Natural antisense transcript-associated siRNA (natsiRNA) | Derived from antisense transcript region | 20–25 | 67, 70 |
| Piwi -intracting RNAs(piwiRNA) | Fertility of male mammals, male fish or fly of either sex | 26–31 | 24, 71-73 |
| X- inactive specific transcript RNAs (xistRNAs) | Inactivation of X chromosome, more severe in females | 16500 | 14, 74-76 |
| Pregnancy- induced non-coding RNA (pincRNA) | Effective during pregnancy | 22–25 | 37 |