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DNA Base Composition in Mycoplasma, Bacteria and Yeast

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Current Topics in Microbiology and Immunology / Ergebnisse der Mikrobiologie und Immunitätsforschung

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Abstract

Knowledge of the base composition of DNA in microorganisms has increased rapidly over the last decade. The main incentive for the efforts made has been the usefulness of the base composition values in microbial taxonomy. Many general features have emerged which may be important for an understanding of the evolution of DNA composition. One of the main characteristics is the broad distribution of base composition among the various organisms. The question is whether this distribution is mainly random or caused by some selective pressures. Another characteristic feature is the heterogeneity in distribution of nucleotides within the individual DNA molecules. The compositional heterogeneity, which may also include differences in base composition between the two complementary strands of the DNA molecules, may be caused by conserved sequences, such as ribosomal RNA cistrons and sequences related to the regulation of replication and transcription. The specific amino acid sequences of the invariable parts of the proteins also create a possibility for heterogeneity in base composition between the DNA corresponding to different genetic markers. The present review gives a brief discussion of some of these problems and attempts to give a complete key to the literature on DNA base composition in mycoplasmas, bacteria and yeasts up to the end of 1971. The methods and problems related to determinations of base compositions are also discussed.

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  1. Institute of Medical Microbiology, University of Aarhus, Aarhus, Denmark

    A. Leth Bak

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Bak, A.L. (1973). DNA Base Composition in Mycoplasma, Bacteria and Yeast. In: Arber, W., et al. Current Topics in Microbiology and Immunology / Ergebnisse der Mikrobiologie und Immunitätsforschung. Current Topics in Microbiology and Immunology / Ergebnisse der Mikrobiologie und Immunitätsforschung, vol 61. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65531-9_3

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