A segment represented in a precursor RNA that is removed by RNA splicing; the corresponding segment of a gene is also called an intron. An intron can interrupt ribosomal RNA as well as messenger RNA.
An intron capable of catalysing its removal through RNA-mediated reactions, although proteins can assist folding and activity in cells.
A class of self-splicing introns with mechanistic and structural relationships to spliceosomal splicing. Some have mobile forms; this does not imply that an ordinary spliceosomal intron retains an autonomous mobile system.
Evolutionary reassortment of exon-associated coding segments. Introns can provide boundaries permitting changes in protein-domain arrangement, but the role of a particular intron requires historical evidence.
A class of introns with a conserved RNA catalytic core and a two-step RNA splicing mechanism initiated by external guanosine. Some group I introns self-splice under suitable conditions; others require protein assistance. The ribozyme body explains the Tetrahymena example.
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