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RNAi-Induced Expression of Paternal UBE3A.

Hye Ri Kang1, Violeta Zaric2, Volodymyr Rybalchenko2

  • 1Department of Pediatrics, UT Southwestern Medical Center, Dallas, TX 75390, USA.

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Summary

Targeting SNORD115 with RNA interference effectively reactivates paternal UBE3A expression in neurons. This study shows a promising strategy for Angelman syndrome by restoring gene function in both mouse and human cells.

Keywords:
Angelman syndromeRNAiUBE3AUBE3A-ATSshRNA

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Angelman syndrome is a neurodevelopmental disorder caused by deficiency of the maternally inherited UBE3A gene.
  • In mature neurons, paternal UBE3A allele is silenced by the UBE3A antisense transcript (UBE3A-ATS).
  • Strategies to activate paternal UBE3A expression are crucial for therapeutic development.

Purpose of the Study:

  • To investigate the downregulation of UBE3A-ATS using RNA interference (RNAi).
  • To assess the activation of paternal UBE3A expression in mouse and human neurons.
  • To evaluate the impact on Angelman syndrome-related genes.

Main Methods:

  • Utilized small interfering RNA (siRNA) and lentiviral short hairpin RNA (LV-shRNA) targeting SNORD115.
  • Administered RNAi to suppress UBE3A-ATS expression in mouse primary neurons and human iPSC-derived neurons.
  • Assessed UBE3A and related gene expression at transcript and protein levels.

Main Results:

  • siRNA and LV-shRNA targeting SNORD115 reduced UBE3A-ATS expression.
  • Observed activation of paternal UBE3A RNA and protein expression in both mouse and human neurons.
  • Similar effects were noted in different genetic backgrounds of mouse neurons.

Conclusions:

  • shRNA-mediated inhibition of UBE3A-ATS by targeting SNORD115 effectively restores UBE3A expression.
  • This approach shows promise for Angelman syndrome treatment in neuronal cells.
  • Further in vivo evaluation is needed to assess translational applicability and potential off-target effects.