Collective Properties of a Transcription Initiation Model under Varying Environment

TL;DR

This paper investigates a simplified transcription initiation model to understand collective gene regulation behaviors, revealing mechanisms for rapid response, memory, and environmental adaptation at the population level.

Contribution

It introduces a collective behavior model of transcription initiation, highlighting how regulation mechanisms enable adaptive responses and memory in gene expression.

Findings

Model predicts synchronized transcriptional responses.

Cells can adapt to environments via different control mechanisms.

The model suggests design principles for transcriptional regulation.

Abstract

The dynamics of gene transcription is tightly regulated in eukaryotes. Recent experiments have revealed various kinds of transcriptional dynamics, such as RNA polymerase II pausing, that involves regulation at the transcription initiation stage, and the choice of different regulation pattern is closely related to the physiological functions of the target gene. Here we consider a simplified model of transcription initiation, a process including the assembly of transcription complex and the pausing and releasing of the RNA polymerase II. Focusing on the collective behaviors on a population level, we explore potential regulatory functions this model can offer. These functions include fast and synchronized response to environmental change, or long-term memory about the transcriptional status. As a proof of concept we also show that, by selecting different control mechanisms cells can adapt to different environments. These findings may help us better understand the design principles of transcriptional regulation.