PMID: 9445075Jan 28, 1998Paper

Mutations in the tat gene are responsible for human immunodeficiency virus type 1 postintegration latency in the U1 cell line

Journal of Virology
S EmilianiEric Verdin

Abstract

Previous reports have demonstrated that the U1 cell line, a model for postintegration latency, is defective at the level of Tat function and can be rescued by exogenously provided Tat protein. Sequence analysis of tat cDNAs from the U1 cell line identified two distinct forms of Tat, in agreement with the fact that this cell line contains two integrated human immunodeficiency (HIV) proviruses. One Tat cDNA lacked an ATG initiation codon, while the other contained an H-to-L mutation at amino acid 13 (H13-->L). Both tat cDNAs were defective in terms of transcriptional activation of long terminal repeat-luciferase reporter gene in transient-transfection experiments. Introduction of the H13-->L mutation in a wild-type tat background caused a severe reduction in transcriptional activation. Introduction of the same mutation in an infectious HIV molecular clone caused a severely defective phenotype which could be rescued when the HIV proviral DNA was transfected in a Jurkat cell line stably expressing the Tat protein (Jurkat-Tat) or in Jurkat cells treated with tumor necrosis factor alpha. Infectious virus stocks generated in Jurkat-Tat cells were used to infect Jurkat cells and exhibited severely impaired growth which could also be re...Continue Reading

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Citations

Nov 17, 2007·The EMBO Journal·Mudit Tyagi, Jonathan Karn
Oct 15, 2010·Virology Journal·Guerau Fernandez, Steven L Zeichner
Jan 29, 2011·Journal of Virology·Edurne GallasteguiAlbert Jordan
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