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Author Spotlight: Exploring Cloning Techniques for Full-Length DNA Fragments
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RPGR gene therapy presents challenges in cloning the coding sequence.

Cristina Martinez-Fernandez De La Camara1,2, Jasmina Cehajic-Kapetanovic1,2, Robert E MacLaren1,2

  • 1Department of Clinical Neurosciences, Nuffield Laboratory of Ophthalmology, University of Oxford, John Radcliffe Hospital, Headley Way, UK.

Expert Opinion on Biological Therapy
|October 16, 2019
PubMed
Summary
This summary is machine-generated.

Gene therapy trials are underway for X-linked retinitis pigmentosa using adeno-associated viral (AAV) vectors to deliver the RPGR gene. Ensuring the correct RPGR gene sequence is crucial for functional protein production in the retina.

Keywords:
Adeno-associated virusclinical trialscodon optimizationgene therapyretinitis pigmentosa GTPase regulator (RPGR)

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • X-linked retinitis pigmentosa (XLRP) is a degenerative retinal disease.
  • Gene therapy offers a potential treatment for XLRP by delivering functional genes.

Purpose of the Study:

  • To review studies leading to current gene therapy clinical trials for RPGR-related XLRP.
  • To discuss challenges in developing effective RPGR gene therapy vectors.

Main Methods:

  • Analysis of ongoing Phase I/II clinical trials for XLRP.
  • Comparison of different adeno-associated viral (AAV) vectors and RPGR coding sequences.
  • Review of scientific literature on RPGR gene function and stability.

Main Results:

  • Three distinct AAV vectors are being tested in clinical trials for XLRP.
  • Vectors vary in capsid type and RPGR coding sequence (codon-optimized full-length vs. wild-type with deletion).
  • RPGR gene instability and function present significant challenges for therapeutic development.

Conclusions:

  • Developing a functional RPGR gene therapy vector is complex due to sequence instability and poorly understood function.
  • Ensuring correct post-translational glutamylation is vital for verifying functional RPGR protein production.