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Transposition of a group II intron

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Abstract

AMONG mobile genetic elements, self-splicing introns are of particular interest. They belong to either group I or group II depending on their three-dimensional structure1& ndash;3. Homing, the systematic intron invasion of an intronless gene when it encounters its homologous intron-bearing allele, is the only means for intron mobility so far demonstrated4. It depends on the activity of the intron-encoded protein and is very specific for the acceptor site4& ndash;7. Intron transposition, the transfer of an intron to a novel site, predicted on the basis of phylogenetic studies8,9 and in vitro reverse-splicing experiments, has been proposed to be responsible for evolutionary intron spreading2,10& ndash;14. Here we present results from polymerase chain reaction experiments consistent with transposition of a group II intron. This event is proposed to account for the site-specific deletion in the mitochondria! chromosome of the fungus Podospora anserina that is associated with the premature death syndrome15 and might also be involved in the senescence process16 affecting this species.

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Authors and Affiliations

  1. Centre de G& eacute;n& eacute;tique Mol& eacute;culaire CNRS, 91198, Gif-sur-Yvette cedex, France

    Carole H. Sellem, Ga& euml;l Lecellier & L& eacute;on Belcour

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  1. Carole H. Sellem
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  2. Ga& euml;l Lecellier
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  3. L& eacute;on Belcour
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Sellem, C., Lecellier, G. & Belcour, L. Transposition of a group II intron. Nature 366, 176–178 (1993). https://doi.org/10.1038/366176a0

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