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Related Concept Videos

Alternative RNA Splicing02:18

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Using the E1A Minigene Tool to Study mRNA Splicing Changes
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A Bioinformatics-Based Alternative mRNA Splicing Code that May Explain Some Disease Mutations Is Conserved in

Wen Qu1, Pablo Cingolani2,3, Barry R Zeeberg4

  • 1Department of Pharmacology, Wayne State UniversityDetroit, MI, USA.

Frontiers in Genetics
|April 27, 2017
PubMed
Summary

Scientists propose an "alternative-splicing code" within introns directs pre-mRNA splicing. This code, found in human introns, explains disease mutations and is conserved across species, revealing new insights into protein diversity.

Keywords:
RNA metabolismalternative splicingbioinformaticssplicesosome

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Area of Science:

  • Molecular Biology
  • Bioinformatics
  • Genetics

Background:

  • Alternative pre-mRNA splicing generates significant protein diversity in animals and plants.
  • Alternative splicing involves various exon types, including skipped exons and those with alternative splice sites.
  • The regulatory mechanisms governing alternative splicing are not fully understood.

Purpose of the Study:

  • To investigate the existence of an
  • alternative-splicing code
  • analogous to the genetic code, that regulates alternative splicing.
  • To identify consensus sequences within introns that may constitute this code.
  • To determine if this code explains disease-associated splicing mutations and evolutionary conservation.

Main Methods:

  • Bioinformatic analysis of deep sequencing data from spliced mRNAs.
  • Identification and analysis of consensus sequences in human introns.
  • Comparison of consensus sequence distribution across different intron types.
  • Analysis of human disease mutations affecting RNA splicing.
  • Assessment of evolutionary conservation of splicing codes.

Main Results:

  • A hypothesis of an
  • alternative-splicing code
  • residing in introns and flanking exon sequences was proposed.
  • 42 consensus sequences were identified in human introns, with 37 significantly enriched or depleted in specific intron types.
  • 96 out of 96 analyzed splicing-related disease mutations could be partially explained by alterations in these consensus sequences.
  • Some consensus sequences are evolutionarily conserved across plant and animal species.
  • Introns within the same gene often share similar splicing codes.

Conclusions:

  • The identified consensus sequences likely represent an
  • alternative-splicing code
  • that directs pre-mRNA splicing.
  • This code provides a mechanistic explanation for alternative splicing regulation and its role in genetic diseases.
  • The findings shed light on the generation of protein diversity through alternative splicing and suggest coordinated splicing within genes.