The dynamic nature of genomes across the tree of life

Angela M. Oliverio, Laura A. Katz

Research output: Contribution to journalReview articlepeer-review

20 Scopus citations

Abstract

Genomes are dynamic in lineages across the tree of life. Among bacteria and archaea, for example, DNA content varies through out life cycles, and nonbinary cell division in diverse lineages indicates the need for coordination of the inheritance of genomes. These observations contrast with the textbook view that bacterial and archaeal genomes are monoploid (i.e., single copied) and fixed both within species and throughout an individual's lifetime. Here, we synthesize information on three aspects of dynamic genomes from exemplars representing a diverse array of bacterial and archaeal lineages: 1) ploidy level variation, 2) epigenetic mechanisms, and 3) life cycle variation. For example, the Euryarchaeota analyzed to date are all polyploid, as is the bacterium Epulopiscium that contains up to tens of thousands of copies of its genome and reproduces by viviparity. The bacterium Deinococcus radiodurans and the archaeon Halobacterium sp. NRC-1 can repair a highly fragmented genome within a few hours. Moreover, bacterial genera such as Dermocarpella and Planctomyces reproduce by fission (i.e., generating many cells from one cell) and budding, respectively, highlighting the need for regulation of genome inheritance in these lineages. Combining these data with our previous work on widespread genome dynamics among eukaryotes, we hypothesize that dynamic genomes are a rule rather than the exception across the tree of life. Further, we speculate that all domains may have the ability to distinguish germline from somatic DNA and that this ability may have been present the last universal common ancestor.

Original languageEnglish (US)
Pages (from-to)482-488
Number of pages7
JournalGenome biology and evolution
Volume6
Issue number3
DOIs
StatePublished - Mar 2014
Externally publishedYes

Keywords

  • Epigenetics
  • Genome
  • Life cycle variation
  • LUCA
  • Polyploidy

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

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