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    Phys Rev Lett. 2005 May 6;94(17):178103. Epub 2005 May 5.

    Divergence and Shannon information in genomes.

    Source

    Department of Physics, National Central University, Chungli, Taiwan 320, Republic of China.

    Abstract

    Shannon information (SI) and its special case, divergence, are defined for a DNA sequence in terms of probabilities of chemical words in the sequence and are computed for a set of complete genomes highly diverse in length and composition. We find the following: SI (but not divergence) is inversely proportional to sequence length for a random sequence but is length independent for genomes; the genomic SI is always greater and, for shorter words and longer sequences, hundreds to thousands times greater than the SI in a random sequence whose length and composition match those of the genome; genomic SIs appear to have word-length dependent universal values. The universality is inferred to be an evolution footprint of a universal mode for genome growth.

    PMID:
    15904339
    [PubMed - indexed for MEDLINE]

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