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. 1989 Oct;86(20):7957-60.
doi: 10.1073/pnas.86.20.7957.

Transmembrane domain of the envelope gene of a polycythemia-inducing retrovirus determines erythropoietin-independent growth

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Transmembrane domain of the envelope gene of a polycythemia-inducing retrovirus determines erythropoietin-independent growth

S W Chung et al. Proc Natl Acad Sci U S A. 1989 Oct.

Abstract

Both the polycythemia-inducing and the anemia-inducing strains of Friend spleen focus-forming virus can induce acute erythroleukemia in susceptible adult mice. However, only cells infected with the polycythemia-inducing strain become erythropoietin-independent for proliferation and differentiation. The sequences responsible for the altered erythropoietin responsiveness have previously been localized to a 678-base-pair EcoRI-Cla I fragment at the 3' end of the envelope gene. This region is now further analyzed by dividing it into two fragments by using the Fok I restriction site. Two recombinants were made by replacing either the 558-base-pair EcoRI-Fok I or the 113-base-pair Fok I-Cla I env gene fragments from the anemia-inducing strain of spleen focus-forming virus with sequences derived from the polycythemia-inducing strain. Our results indicate that the 113-base-pair Fok I-Cla I fragment, which encodes primarily the transmembrane domain of the envelope protein, determines erythropoietin-independent growth.

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