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© Research
Publication : Trends in genetics : TIG

Base composition bias might result from competition for metabolic resources

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Trends in genetics : TIG - 01 Jun 2002

Rocha EP, Danchin A

Link to Pubmed [PMID] – 12044357

Trends Genet. 2002 Jun;18(6):291-4

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.

http://www.ncbi.nlm.nih.gov/pubmed/12044357