alexa Base composition bias might result from competition for metabolic resources.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Data Mining in Genomics & Proteomics

Author(s): Rocha EP, Danchin A, Rocha EP, Danchin A, Rocha EP, Danchin A, Rocha EP, Danchin A

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Abstract The GC content of bacterial genomes varies from 25 to 75\%, but the reason for this variation is unclear. Here, we show that genomes of bacteria that rely on their host for survival (obligatory pathogens or symbionts) tend to be AT rich. Furthermore, we have analysed bacterial phages, plasmids and insertion sequences, which might also be regarded as 'intracellular pathogens', and show that they too are significantly richer in AT than their hosts. We suggest that the higher energy cost and limited availability of G and C over A and T/U could be a basis for the understanding of these differences. This article was published in Trends Genet and referenced in Journal of Data Mining in Genomics & Proteomics

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