Introducing the bacterial 'chromid': not a chromosome, not a plasmid.

  title={Introducing the bacterial 'chromid': not a chromosome, not a plasmid.},
  author={Peter W. Harrison and Ryan P. J. Lower and Nayoung K. D. Kim and J Peter W Young},
  journal={Trends in microbiology},
  volume={18 4},
In addition to the main chromosome, approximately one in ten bacterial genomes have a 'second chromosome' or 'megaplasmid'. Here, we propose that these represent a single class of elements that have a distinct and consistent set of properties, and suggest the term 'chromid' to distinguish them from both chromosomes and plasmids. Chromids carry some core genes, and their nucleotide composition and codon usage are very similar to those of the chromosomes they are associated with. By contrast… CONTINUE READING
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