Primordial spliceosomal introns were probably U2-type

Academic Article


  • The two types of eukaryotic spliceosomal introns, U2 and U12, possess different splice signals and are excised by distinct spliceosomes. The nature of the primordial introns remains uncertain. A comparison of the amino acid distributions at insertion sites of introns that retained their positions throughout eukaryotic evolution with the distributions for human and Arabidopsis thaliana U2 and U12 introns reveals close similarity with U2 but not U12. Thus, the primordial spliceosomal introns were, most likely, U2-type.
  • Published In

  • Trends in Genetics  Journal
  • Digital Object Identifier (doi)

    Author List

  • Basu MK; Rogozin IB; Koonin EV
  • Start Page

  • 525
  • End Page

  • 528
  • Volume

  • 24
  • Issue

  • 11