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J Virol. 1990 September; 64(9): 4565-4567

Human chromosome 12 encodes a species-specific factor which increases human immunodeficiency virus type 1 tat-mediated trans activation in rodent cells.

Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912.

ABSTRACT

The human immunodeficiency virus type 1 (HIV-1) tat protein functions at a much lower level in rodent cells than in human cells. This species-specific difference in trans activation appears to be due to the lack of a functional homolog of a human cofactor for tat in rodent cells. Using HIV-1 long terminal repeat-driven human growth hormone as a reporter plasmid, we found that the tat-mediated trans activation functions at a level 5- to 20-fold lower in rodent cells than in human cells. Stable rodent-human hybrid cells containing only human chromosome 12 support a dramatically higher degree of trans activation. Thus, human chromosome 12 encodes a species-specific HIV-1 tat cofactor which, at least partially, restores high levels of tat-mediated trans activation. Chromosome 6 also appears to provide an additional factor which enhances HIV-1 tat-mediated trans activation in murine cells.

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