The function of introns

Michal Chorev, Liran Carmel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

255 Scopus citations


The intron-exon architecture of many eukaryotic genes raises the intriguing question of whether this unique organization serves any function, or is it simply a result of the spread of functionless introns in eukaryotic genomes. In this review, we show that introns in contemporary species fulfill a broad spectrum of functions, and are involved in virtually every step of mRNA processing. We propose that this great diversity of intronic functions supports the notion that introns were indeed selfish elements in early eukaryotes, but then independently gained numerous functions in different eukaryotic lineages. We suggest a novel criterion of evolutionary conservation, dubbed intron positional conservation, which can identify functional introns.

Original languageAmerican English
Article numberArticle 55
JournalFrontiers in Genetics
Issue numberAPR
StatePublished - 2012


  • Exon-junction complex
  • Expression regulation
  • Gene architecture
  • Intron function
  • Intron positional conservation
  • Intron-exon structure
  • Non-coding RNAs
  • Splicing


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