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Related Experiment Video

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Frequency-modulated nuclear localization bursts coordinate gene regulation.

Long Cai¹, Chiraj K Dalal, Michael B Elowitz

¹Howard Hughes Medical Institute, Division of Biology and Department of Applied Physics, California Institute of Technology, M/C 114-96, Pasadena, California 91125, USA.

|September 27, 2008

Summary

This summary is machine-generated.

Calcium signals regulate yeast transcription factor Crz1 nuclear entry through burst frequency, not duration. This mechanism ensures proportional gene expression across varying levels, suggesting a general cellular control strategy.

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Area of Science:

Molecular Biology
Cellular Biology
Systems Biology

Background:

Transcription factor Crz1 translocates to the nucleus in yeast upon calcium stimulation.
Cellular responses to external signals often involve complex regulatory mechanisms.

Purpose of the Study:

To investigate the dynamics of Crz1 nuclear localization in response to calcium.
To elucidate the regulatory role of calcium concentration on Crz1 localization bursts.
To determine if this regulatory mechanism is conserved in other transcription factors.

Main Methods:

Time-lapse microscopy to observe Crz1 localization dynamics in individual yeast cells.
Development and application of an analytic model to understand frequency modulation.
Experimental validation using natural and synthetic Crz1 target promoters.

Main Results:

Crz1 exhibits stochastic, short bursts of nuclear localization (approx. 2 min).
Calcium concentration modulates the frequency, but not the duration, of these bursts.
Frequency modulation ensures proportional expression of multiple target genes across a wide dynamic range.
Similar, though uncorrelated, localization bursts were observed for the Msn2 transcription factor.

Conclusions:

Calcium-induced Crz1 localization bursts are regulated by frequency, enabling precise multi-gene expression control.
Frequency modulation of localization bursts may represent a general cellular strategy for coordinating gene responses to external stimuli.
This mechanism allows for robust gene expression independent of promoter characteristics.