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Walleye discrete epidermal hyperplasia (WEH) is a hyperproliferative skin disease that is prevalent on adult walleye fish throughout North America. We have identified two retroviruses associated with WEH, designated here as walleye epidermal hyperplasia virus type 1 and type 2 (WEHV1 and WEHV2), that are closely related to one another (77% identity) and to walleye dermal sarcoma virus (64% identity) within the polymerase region. WEHV1 and/or WEHV2 viral DNA was readily detected by PCR in hyperplastic tissue samples, but only low levels of viral DNA were detected in uninvolved skin. Southern blot analysis showed one to three copies of integrated WEHV2 viral DNA in lesions but did not detect WEHV2 viral DNA in uninvolved skin from the same fish. Northern blots detected abundant levels of WEHV1 and/or WEHV2 virion RNA transcripts of approximately 13 kb in hyperplastic tissue, but virion RNA was not observed in uninvolved skin and muscle. These results suggest that WEHV1 and WEHV2 are the causative agents of discrete epidermal hyperplasia.

Two Closely Related but Distinct Retroviruses Are Associated with Walleye Discrete Epidermal Hyperplasia