Transient amplification limits noise suppression in biochemical networks.

Area of Science:

• Biophysics
• Systems Biology
• Biochemistry

Background:

• Cell physiology relies on complex biochemical reaction networks.
• Random fluctuations (noise) propagate through these networks, impacting cell behavior.
• Understanding how network design influences noise suppression or exploitation is crucial.

Purpose of the Study:

• To explore how network connectivity influences the suppression or amplification of small fluctuations in biochemical systems.
• To investigate the role of transient amplification in limiting a system's ability to suppress noise.

Main Methods:

• Utilized insights from statistical physics, fluid dynamics, and systems biology.
• Analyzed biochemical systems with varying numbers of variables and interactions.
• Compared noise amplification levels with predictions from linear stability theory.

Main Results:

• Even simple two-variable systems exhibit significant transient amplification of small fluctuations.
• Additional interactions can increase amplification, even those designed to suppress noise.
• Transient amplification is an emergent phenomenon near steady states in networks with strong interactions.

Conclusions:

• Transient amplification inherently limits the ability of biochemical networks to suppress small fluctuations.
• This phenomenon is a fundamental factor determining baseline noise levels in intracellular networks.
• Noise amplification is a general property of stable intracellular networks, independent of specific mechanisms or functions.