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Poison exons in neurodevelopment and disease

Gemma L Carvill1, Heather C Mefford2

  • 1Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.

Current Opinion in Genetics & Development
|July 3, 2020
PubMed

Insights

Poison exons are conserved DNA sequences that regulate gene expression by triggering transcript degradation. Understanding their role in development and disease could lead to new therapies for undiagnosed conditions.

Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Poison exons are conserved DNA sequences containing premature termination codons.
  • Their inclusion in transcripts targets them for nonsense-mediated decay, reducing protein production.
  • They are implicated in tissue-specific gene expression, development, and autoregulation.

Purpose of the Study:

  • To investigate the role and significance of poison exons in biological processes.
  • To explore the implications of poison exons in cell-type specific splicing and disease.

Main Methods:

  • Systematic investigation of alternative splicing in brain tissues.
  • Analysis of pathogenic variants in or near poison exons.
  • Review of existing literature on poison exon function.

Main Results:

  • Poison exons are abundant in brain transcripts, with some showing cell-type specific splicing.
  • Aberrant splicing due to variants in poison exons is linked to diseases involving genes like FLNA, SCN1A, and SNRPB.

Conclusions:

  • Poison exons play a crucial role in regulating gene expression.
  • Further understanding of poison exons offers potential for diagnosing and treating genetic disorders.

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