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Related Experiment Videos

Physical limits to biochemical signaling.

William Bialek1, Sima Setayeshgar

  • 1Joseph Henry Laboratories of Physics and Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, NJ 08544, USA. wbialek@princeton.edu

Proceedings of the National Academy of Sciences of the United States of America
|July 12, 2005
PubMed
Summary

Biological processes with few molecules face noise. This study revisits Berg and Purcell

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Area of Science:

  • Biophysics
  • Cellular Biology
  • Biochemistry

Background:

  • Many essential biological processes involve limited molecular counts, leading to significant noise.
  • Bacterial chemotaxis, a key cellular response, is known to be limited by molecule counting noise.

Purpose of the Study:

  • To generalize Berg and Purcell's arguments on noise limitations in biological signaling.
  • To estimate the fundamental physical limits for intracellular signaling processes.
  • To assess if recent experimental findings align with these theoretical limits.

Main Methods:

  • Revisiting and generalizing theoretical arguments on molecular noise.
  • Estimating physical limits for cellular signaling processes.
  • Comparing theoretical predictions with existing experimental data.

Main Results:

  • The study provides generalized arguments for physical limits in cellular signaling.
  • Theoretical performance limits due to molecular noise were estimated.
  • Recent experimental results are shown to be consistent with these estimated limits.

Conclusions:

  • Cellular signaling processes, especially those with low molecule numbers, are fundamentally constrained by molecular noise.
  • The theoretical framework helps understand the physical boundaries of biological sensing.
  • Experimental observations support the notion that cells operate near these fundamental physical limits.

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