Table 1.
ERV/LTR groups mentioned in this review
| ERV Class | ERV Group | Associated LTRs (Repbase names) | ~Copies of internal regionsa | ~Copies of solitary LTRsb |
|---|---|---|---|---|
| I (ERV1) | HERV-H | LTR7, 7B, 7C, 7Y | 1060 | 1270 |
| HERV-9 | LTR12, 12B-12 F | 450 | 6500 | |
| HERV-E | LTR2, 2B, 2C | 250 | 720 | |
| HUERS-P2 | LTR1, 1A-1 F | 120 | 3000 | |
| LOR1 | LOR1a, 1b | 175 | 1080 | |
| MER41 | MER41A-41G | 275 | 4110 | |
| II (ERVK) | HERV-K (HML-2) | LTR5, 5A, 5B, 5Hs | 80 | 1200 |
| III (ERVL) | HERV16 | LTR16A-16E | 860 | 18100 |
| III (MaLR) | THE | THE1A-1D | 7900 | 21260 |
| MLT1 | MLT1A-1O | 3820 | 146,550 |
aCopy numbers of internal regions estimated from Dfam (dfam.org) [50]
bSolitary LTR numbers estimated from Dfam coverage minus 2x internal region numbers, assuming all internal regions are associated with two LTRs