Journal of Molecular Evolution

, Volume 66, Issue 4, pp 350–361 | Cite as

Extensive Rearrangements in the Chloroplast Genome of Trachelium caeruleum Are Associated with Repeats and tRNA Genes

  • Rosemarie C. Haberle
  • H. Matthew Fourcade
  • Jeffrey L. Boore
  • Robert K. Jansen
Article

Abstract

Chloroplast genome organization, gene order, and content are highly conserved among land plants. We sequenced the chloroplast genome of Trachelium caeruleum L. (Campanulaceae), a member of an angiosperm family known for highly rearranged genomes. The total genome size is 162,321 bp, with an inverted repeat (IR) of 27,273 bp, large single-copy (LSC) region of 100,114 bp, and small single-copy (SSC) region of 7,661 bp. The genome encodes 112 different genes, with 17 duplicated in the IR, a tRNA gene (trnI-cau) duplicated once in the LSC region, and a protein-coding gene (psbJ) with two duplicate copies, for a total of 132 putatively intact genes. ndhK may be a pseudogene with internal stop codons, and clpP, ycf1, and ycf2 are so highly diverged that they also may be pseudogenes. ycf15, rpl23, infA, and accD are truncated and likely nonfunctional. The most conspicuous feature of the Trachelium genome is the presence of 18 internally unrearranged blocks of genes inverted or relocated within the genome relative to the ancestral gene order of angiosperm chloroplast genomes. Recombination between repeats or tRNA genes has been suggested as a mechanism of chloroplast genome rearrangements. The Trachelium chloroplast genome shares with Pelargonium and Jasminum both a higher number of repeats and larger repeated sequences in comparison to eight other angiosperm chloroplast genomes, and these are concentrated near rearrangement endpoints. Genes for tRNAs occur at many but not all inversion endpoints, so some combination of repeats and tRNA genes may have mediated these rearrangements.

Keywords

Chloroplast genome evolution Genome rearrangements Repeated sequences Trachelium caeruleum Campanulaceae 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Rosemarie C. Haberle
    • 1
    • 2
  • H. Matthew Fourcade
    • 3
  • Jeffrey L. Boore
    • 3
    • 4
  • Robert K. Jansen
    • 1
  1. 1.Section of Integrative Biology and Institute of Cellular and Molecular BiologyUniversity of TexasAustinUSA
  2. 2.Department of Plant Sciences, Mail Stop 2University of CaliforniaDavisUSA
  3. 3.DOE Joint Genome InstituteWalnut CreekUSA
  4. 4.Genome Project SolutionsHerculesUSA

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