Biology – Quantitative Biology – Quantitative Methods
Scientific paper
2010-07-23
Tsvi Tlusty 2008 Phys. Biol. 5 016001
Biology
Quantitative Biology
Quantitative Methods
Keywords: molecular codes, rate-distortion theory, biological information channels, stochastic maps, genetic code, genetic net
Scientific paper
10.1088/1478-3975/5/1/016001
Molecular codes translate information written in one type of molecules into another molecular language. We introduce a simple model that treats molecular codes as noisy information channels. An optimal code is a channel that conveys information accurately and efficiently while keeping down the impact of errors. The equipoise of the three conflicting needs, for minimal error-load, minimal cost of resources and maximal diversity of vocabulary, defines the fitness of the code. The model suggests a mechanism for the emergence of a code when evolution varies the parameters that control this equipoise and the mapping between the two molecular languages becomes non-random. This mechanism is demonstrated by a simple toy model that is formally equivalent to a mean-field Ising magnet.
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