Chromatin remodeling under stress
nounPronunciation: /ˈkroʊmətɪn ˈriːmɑːdəlɪŋ ʌndər stres/
Dynamic alterations in chromatin structure and histone modifications that regulate gene expression patterns in response to abiotic stresses. These epigenetic changes control accessibility of DNA to transcription factors, enabling rapid stress-responsive gene activation or silencing.
Plain English
DNA packaging changes under stress to turn stress-response genes on or off quickly.
Etymology & History
Usage
"Chromatin remodeling under stress facilitated rapid expression of cold-responsive transcription factors within minutes of temperature decline."
Style guide notes: Specify chromatin remodeling complexes (SWI/SNF, ISWI, CHD) and histone marks involved when discussing mechanisms.
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Frequently Asked Questions
What histone modifications occur during stress?
Acetylation, methylation, phosphorylation, and ubiquitination of histones regulate chromatin accessibility and gene expression.
How do chromatin changes persist after stress?
Stress-induced chromatin modifications can establish epigenetic memory, enhancing stress tolerance in subsequent stress exposures.
Why Test Candidates on This?
Important for advanced molecular stress physiology; relevant in graduate-level and specialized research contexts.
Required skill level: Senior