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Related Concept Videos

Gene Therapy00:59

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Gene therapy is a technique where a gene is inserted into a person’s cells to prevent or treat a serious disease. The added gene may be a healthy version of the gene that is mutated in the patient, or it could be a different gene that inactivates or compensates for the patient’s disease-causing gene. For example, in patients with severe combined immunodeficiency (SCID) due to a mutation in the gene for the enzyme adenosine deaminase, a functioning version of the gene can be...
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Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...
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[Developments in gene delivery vectors for ocular gene therapy].

Hanen Khabou1, Deniz Dalkara1

  • 1Inserm UMR S968, Institut de la vision, 17, rue Moreau, 75012 Paris, France - Sorbonne universités, UPMC université Paris 6, UMR S968, 75012 Paris, France - CNRS, UMR 7210, 75012 Paris, France.

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Summary

Gene therapy shows promise for inherited retinal diseases, particularly using adeno-associated virus (AAV) vectors. This approach leverages the eye's unique properties for effective treatment delivery.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Gene therapy is emerging as a clinical reality for inherited retinal diseases.
  • Clinical trials for Leber's congenital amaurosis (LCA) type II demonstrated significant safety and efficacy.
  • The retina is an ideal target organ due to accessibility and immune privilege.

Purpose of the Study:

  • To discuss the use of viral vectors, focusing on adeno-associated virus (AAV), for retinal gene delivery.
  • To explore potential cellular targets for AAV-based gene therapies in other retinal diseases.
  • To review the AAV toolkit and challenges in clinical translation.

Main Methods:

  • Review of viral vectors used in retinal gene delivery, including lentivirus, adenovirus, and AAV.
  • Emphasis on the favorable properties of AAV for neural retina applications.
  • Discussion of AAV toolkit development and clinical translation challenges.

Main Results:

  • AAV's small size facilitates diffusion in the neural retina, making it suitable for gene delivery.
  • Successful clinical trials for LCA type II provide a proof-of-concept for retinal gene therapy.
  • Numerous opportunities exist to extend AAV-based gene therapy to other retinal conditions.

Conclusions:

  • Adeno-associated virus (AAV) vectors are highly effective for retinal gene delivery.
  • Gene therapy holds significant potential for treating a range of inherited retinal diseases.
  • Further development of the AAV toolkit and addressing clinical challenges are crucial for broader application.