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Inactivation of group II intron RmInt1 in the Sinorhizobium meliloti genome.

ABSTRACT: Group II introns are self-splicing catalytic RNAs that probably originated in bacteria and act as mobile retroelements. The dispersal and dynamics of group II intron spread within a bacterial genome are thought to follow a selection-driven extinction model. Likewise, various studies on the evolution of group II introns have suggested that they are evolving toward an inactive form by fragmentation, with the loss of the intron 3'-terminus, but with some intron fragments remaining and continuing to evolve in the genome. RmInt1 is a mobile group II intron that is widespread in natural populations of Sinorhizobium meliloti, but some strains of this species have no RmInt1 introns. We studied the splicing ability and mobility of the three full-length RmInt1 copies harbored by S. meliloti 1021, and obtained evidence suggesting that specific mutations may lead to the impairment of intron splicing and retrohoming. Our data suggest that the RmInt1 copies in this strain are undergoing a process of inactivation.

SUBMITTER: Molina-Sanchez MD

PROVIDER: S-EPMC4496777 | biostudies-literature | 2015

REPOSITORIES: biostudies-literature

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Inactivation of group II intron RmInt1 in the Sinorhizobium meliloti genome.

Molina-Sánchez María Dolores MD Toro Nicolás N

Scientific reports 20150709

Group II introns are self-splicing catalytic RNAs that probably originated in bacteria and act as mobile retroelements. The dispersal and dynamics of group II intron spread within a bacterial genome are thought to follow a selection-driven extinction model. Likewise, various studies on the evolution of group II introns have suggested that they are evolving toward an inactive form by fragmentation, with the loss of the intron 3'-terminus, but with some intron fragments remaining and continuing to ...[more]

PMID: 26156864

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Splicing of the Sinorhizobium meliloti RmInt1 group II intron provides evidence of retroelement behavior.

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