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Splicing Control of Pontocerebellar Development.

Sharan Paul1, Daniel R Scoles1, Stefan M Pulst1

  • 1Department of Neurology, University of Utah, 175 North Medical Drive East, 5th Floor, Salt Lake City, UT 84132, USA.

Neuron
|January 21, 2021
PubMed
Summary

Recessive mutations in peptidyl-prolyl isomerase-like 1 (PPIL1) and pre-RNA-processing-17 (PPR17) cause neurodegeneration with pontocerebellar hypoplasia and microcephaly. These proteins are crucial for RNA splicing, particularly for GC-rich and short introns.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Neurodegenerative disorders are a significant health concern.
  • Pontocerebellar hypoplasia and microcephaly are rare developmental brain disorders.
  • Genetic factors play a critical role in the etiology of many neurodevelopmental and neurodegenerative conditions.

Purpose of the Study:

  • To identify the genetic cause of neurodegeneration in families with pontocerebellar hypoplasia and microcephaly.
  • To investigate the function of identified genes in neuronal development and survival.
  • To elucidate the molecular mechanisms underlying the observed phenotypes.

Main Methods:

  • Whole-exome sequencing was performed on affected individuals from multiple families.
  • Functional studies in cell lines and animal models (knockin mice) were conducted.
  • RNA sequencing was used to analyze splicing patterns in patient-derived cells and mouse models.

Main Results:

  • Recessive mutations in PPIL1 and PPR17 were identified as causative for the observed neurodevelopmental disorder.
  • PPIL1 patient mutation knockin mice exhibited neuronal apoptosis, indicating a role in neuronal survival.
  • Loss of PPIL1 or PPR17 function led to widespread splicing defects, predominantly affecting GC-rich and short introns.

Conclusions:

  • PPIL1 and PPR17 are essential for normal brain development and neuronal maintenance.
  • Mutations in these genes result in a severe neurodevelopmental disorder characterized by pontocerebellar hypoplasia and microcephaly.
  • The identified proteins play a critical role in RNA splicing, highlighting splicing dysregulation as a pathogenic mechanism in neurodegeneration.