What question did this study set out to answer?

This work aims to understand how the nuclear localization of phosphorylated STAT1 regulates signal transduction in response to interferon-γ.

Nuclear export block of tyrosine-phosphorylated STAT1 facilitates rapid responsiveness to interferon-γ stimuli at the expense of signal strength

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Mathematical modeling demonstrates how nuclear export impacts STAT1 signaling dynamics, highlighting flexible responses.

This work aims to understand how the nuclear localization of phosphorylated STAT1 regulates signal transduction in response to interferon-γ.
Developed a mathematical rate equation model for STAT1 nucleocytoplasmic shuttling.
Conducted experiments using STAT1 mutants with altered transport properties.
Utilized computational simulations to analyze transport dynamics.
Calculated mean residence times and half-lives of STAT1 in the nucleus.
Phosphorylated STAT1's mean residence time in the nucleus was 13.1 minutes.
Unphosphorylated STAT1 had a half-life of 5.0 minutes in resting cells.
The STAT1 pathway balances rapid signal termination and effective signal output.
Decoupling nuclear export from dephosphorylation resulted in lower nuclear levels of activated STAT1.

Meyer et al. (2026) studied this question.

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