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Science 15 January 1999:
Vol. 283. no. 5400, pp. 381 - 387
DOI: 10.1126/science.283.5400.381
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Reports

Emergent Properties of Networks of Biological Signaling Pathways

Upinder S. Bhalla and Ravi Iyengar *

Many distinct signaling pathways allow the cell to receive, process, and respond to information. Often, components of different pathways interact, resulting in signaling networks. Biochemical signaling networks were constructed with experimentally obtained constants and analyzed by computational methods to understand their role in complex biological processes. These networks exhibit emergent properties such as integration of signals across multiple time scales, generation of distinct outputs depending on input strength and duration, and self-sustaining feedback loops. Feedback can result in bistable behavior with discrete steady-state activities, well-defined input thresholds for transition between states and prolonged signal output, and signal modulation in response to transient stimuli. These properties of signaling networks raise the possibility that information for "learned behavior" of biological systems may be stored within intracellular biochemical reactions that comprise signaling pathways.

U. S. Bhalla, Department of Pharmacology, Mount Sinai School of Medicine, New York, NY 10029, USA, and National Centre for Biological Sciences, Post Office Box 1234, Bangalore 560012, India. R. Iyengar, Department of Pharmacology, Mount Sinai School of Medicine, New York, NY 10029, USA.
*   To whom correspondence should be addressed.

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