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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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Single-stranded genomic architecture constrains optimal codon usage.

Daniel J Cardinale1, Siobain Duffy

  • 1Department of Ecology, Evolution and Natural Resources; School of Environmental and Biological Sciences; Rutgers; The State University of New Jersey; New Brunswick, NJ USA.

Bacteriophage
|February 16, 2012
PubMed
Summary
This summary is machine-generated.

Bacteriophage codon usage, influenced by host genomes, differs based on viral DNA type. Single-stranded DNA phages show less host adaptation than double-stranded DNA phages due to specific codon biases.

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Area of Science:

  • Virology
  • Genomics
  • Molecular Biology

Background:

  • Viral codon usage is influenced by host mutational pressures and selection for optimal gene expression.
  • Genomic architecture, specifically DNA type (single-stranded vs. double-stranded), may impact viral codon usage bias.

Purpose of the Study:

  • To investigate how bacteriophage genomic architecture (ssDNA vs. dsDNA) affects codon usage bias relative to their bacterial hosts.
  • To determine if ssDNA and dsDNA phages exhibit different adaptation levels to host codon usage patterns.

Main Methods:

  • Comparative analysis of codon usage profiles between bacteriophages and their respective bacterial hosts.
  • Examination of genomic nucleotide content and specific codon preferences in ssDNA and dsDNA phages.

Main Results:

  • Both ssDNA and dsDNA phages' codon usage correlated with host genomic nucleotide content.
  • Coat genes of ssDNA phages were less adapted to host codon usage than dsDNA phages, showing a preference for thymine-ending codons.
  • ssDNA phages favored NNT codons in cases of redundancy, suggesting a cytosine to thymine mutational pressure.

Conclusions:

  • Genomic architecture influences viral codon usage bias, with ssDNA phages exhibiting distinct adaptation patterns compared to dsDNA phages.
  • A C-to-T mutational pressure, coupled with selection against non-synonymous mutations, appears to shape ssDNA viral codon usage bias.