Work

Transient-mediated fate determination in a transcriptional circuit of HIV

Year: 2007

Type: article

Abstract: Steady-state behavior and bistability have been proposed as mechanisms for decision making in gene circuits. However, transient gene expression has also been proposed to control cell fate, with the decision arbitrated by the duration of a transient gene expression pulse. Here, using an HIV-1 model system, we directly quantify transcriptional feedback strength and its effects on both the duration of HIV-1 Tat transcriptional pulses and the fate of HIV-infected cells. By measuring shifts in the autocorrelation of noise inherent to gene expression, we found that transcriptional positive feedback extends the single-cell Tat expression lifetime two- to sixfold for both minimal Tat circuits and full length, actively replicating HIV-1. Notably, artificial weakening of Tat positive feedback shortened the duration of Tat expression transients and biased the probability in favor of latency. Thus, transcriptional positive feedback can modulate transient expression lifetime to a greater extent than protein half-life modulation, and it has a critical role in the cell-fate decision in HIV.

Source: Nature Genetics

DOI: 10.1038/ng.116

Authors: Leor S Weinberger, Roy D Dar, Michael L Simpson

Institutions: University of California San Diego, Oak Ridge National Laboratory, Center for Nanophase Materials Sciences, University of Tennessee at Knoxville

Language: English

Topic: Gene Regulatory Network Analysis

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: diamond

Funders: Princeton University, Oak Ridge National Laboratory

OpenAlex ID: W2054350561