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Recursive splicing in long vertebrate genes.

Christopher R Sibley1,2, Warren Emmett3, Lorea Blazquez1

  • 1Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London, WC1N 3BG, UK.

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|May 14, 2015
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Summary
This summary is machine-generated.

Recursive splicing, a multi-step intron removal process, is found in long mammalian brain genes. This mechanism uses recursive splice sites (RS-sites) to generate diverse messenger RNA isoforms, impacting neuronal development.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Neuroscience

Background:

  • Intron removal typically occurs as a single unit during RNA splicing.
  • Recursive splicing is a less common, multi-step intron removal process observed in some organisms.
  • The prevalence and mechanisms of recursive splicing in vertebrates, particularly in neuronal genes, remain largely unexplored.

Purpose of the Study:

  • To investigate the occurrence and functional significance of recursive splicing in mammalian genes.
  • To elucidate the mechanistic basis of recursive splicing in vertebrate systems.
  • To understand how recursive splicing contributes to the diversity of mRNA isoforms in the brain.

Main Methods:

  • Identification and analysis of conserved recursive splice sites (RS-sites) in mammalian genes.
  • Comparative genomics across vertebrates to assess the distribution of RS-sites.
  • Experimental investigation of RS-exon inclusion and exclusion mechanisms.
  • Analysis of mRNA isoforms generated by recursive splicing.

Main Results:

  • Highly conserved RS-sites were identified in mammalian brain genes crucial for neuronal development.
  • RS-sites are prevalent in some of the longest introns across vertebrates.
  • Vertebrate recursive splicing involves the formation of an 'RS-exon' that is typically excluded from dominant mRNA isoforms.
  • RS-exon inclusion is regulated by the efficiency of 5' splice site reconstitution and can lead to decreased mRNA stability.

Conclusions:

  • Recursive splicing is an evolutionarily conserved mechanism in vertebrates, particularly active in long introns of neuronal genes.
  • RS-sites act as binary splicing switches, generating distinct mRNA isoforms by coupling cryptic regulatory elements with RS-exon inclusion/exclusion.
  • This process contributes to transcriptome diversity and potentially regulates gene expression in neuronal development.