Table 1.

Identification and classification of ~3,200 HERV sequences in GRCh37/hg19 genome assembly by RetroTector (adapted from Vargiu et al., 2016).

Class	Genus	Ex. speciesa	Sequences	Clades	Supergroups	Canonical groups
Class I	Gamma-like Epsilon-like	MLV, FELV, WDSV	2341	27 C 25 NC	MMLV-like	HERV-T
					HERVERI	7.1.1.1 HERV-E, HERV3, HERV1, HERV-I
					HERVW9	HERV-W, HERV9
					HERVIPADP	HERVIP, HERVADP
					HERVHF	HERV-H, HERV-H48, HERV-FA, HERV-FB, HERV-FC, LTR46
					HERVFRD-like	HERV-FRD, PRIMA41, PABL, HERV4
					HEPSI	HEPSI2, HEPSI3, MER65, PRIMA4
					HUERSP	HUERSP1, HUERSP2, HUERSP3
Class II	Beta-like	MMTV, MPMV, JSRV	598	10 C 0 NC	HERV-K	HML1, HML2, HML3, HML4, HML5, HML6, HML7, HML8, HML9, HML10
Class III	Spuma-like	SFV	216	2 C 5 NC	HSERVIII	HERV-S, HERV-L
Uncertain	Erranti-like	Gipsy RV	2	0 C 1 NC	–	–
Unclass	–	–	16	–	–	–
Total			3,173	39 C 31 NC	–	–

MLV, murine leukemia virus; FELV, feline leukemia virus; WDSV, walleye dermal sarcoma virus; MMTV, mouse mammary tumor virus; MPMV, Mason-Pfizer monkey virus; JSRV, jaagsiekte sheep retrovirus; SFV, simian foamy virus; C, canonical; NC, non-canonical.

^aExogenous retroviral species representative of the genus.