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Mitochondrial variability as a source of extrinsic cellular noise
Iain G Johnston1, Bernadett Gaal, Ricardo Pires das Neves
1Department of Physics, Clarendon Laboratory, Oxford, United Kingdom.
Plos Computational Biology
|March 14, 2012
Summary
Mitochondrial variability significantly impacts cellular processes by introducing noise. This variability affects transcription rates, gene expression, and cell cycle dynamics, influencing stem cell differentiation and drug responses.
Area of Science:
- Cellular Biology
- Systems Biology
- Biophysics
Background:
- Cellular noise affects fundamental processes like transcription and differentiation.
- Sources of cellular noise are not fully understood.
- Mitochondria are key organelles with dynamic properties.
Purpose of the Study:
- Investigate mitochondrial variability as a source of cellular noise.
- Link mitochondrial dynamics to transcription rate variability.
- Assess the impact of this noise on cellular processes and models.
Main Methods:
- Developed a model linking mitochondrial variability and cell cycle dynamics to transcription noise.
- Supported the model with existing and new experimental data.
- Analyzed the effect of transcription noise on stem cell differentiation models.
Main Results:
- Mitochondrial variability can be a dominant source of cellular noise.
- This noise significantly alters cell cycle length and gene expression.
- Extrinsic noise in transcription rate causes variability in stem cell differentiation models.
Conclusions:
- Mitochondrial variability is a crucial factor in cellular noise.
- This noise profoundly influences cellular processes and properties.
- Understanding mitochondrial noise is key for fields like stem cell biology and pharmacology.
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