Lateral transfer of introns in the cryptophyte plastid genome.

Lateral transfer of introns in the cryptophyte plastid genome. Research Abstract Details 

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Lateral transfer of introns in the cryptophyte plastid genome. Abstract Text:

Cryptophytes are unicellular eukaryotic algae that acquired photosynthesis secondarily through the uptake and retention of a red-algal endosymbiont. The plastid genome of the cryptophyte Rhodomonas salina CCMP1319 was recently sequenced and found to contain a genetic element similar to a group II intron. Here, we explore the distribution, structure and function of group II introns in the plastid genomes of distantly and closely related cryptophytes. The predicted secondary structures of six introns contained in three different genes were examined and found to be generally similar to group II introns but unusually large in size (including the largest known noncoding intron). Phylogenetic analysis suggests that the cryptophyte group II introns were acquired via lateral gene transfer (LGT) from a euglenid-like species. Unexpectedly, the six introns occupy five distinct genomic locations, suggesting multiple LGT events or recent transposition (or both). Combined with structural considerations, RT-PCR experiments suggest that the transferred introns are degenerate 'twintrons' (i.e. nested group II/group III introns) in which the internal intron has lost its splicing capability, resulting in an amalgamation with the outer intron.

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Lateral transfer of introns in the cryptophyte plastid genome. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Nucleic acids research

VOLUME: 36

Page Numbers: 3043-53

Journal Abbreviation: Nucleic Acids Res.

ISSN: 1362-4962

DAY: 8

MONTH: 04

YEAR: 2008

Lateral transfer of introns in the cryptophyte plastid genome. Information

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LANGUAGE: eng

NlmUniqueID: 411011

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Grant and Affiliation Information for Lateral transfer of introns in the cryptophyte plastid genome.

AFFILIATION: Canadian Institute for Advanced Research, Program in Integrated Microbial Biodiversity, Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada. khanh@dal.ca

Country: England

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MEDLINETA: Nucleic Acids Res

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