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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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Related Experiment Video

Updated: Feb 16, 2026

Electroporation-Based Genetic Modification of Primary Human Pigment Epithelial Cells Using the Sleeping Beauty Transposon System
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Gene Therapy for Color Blindness.

Mark M Hassall1,2, Alun R Barnard1,2, Robert E MacLaren1,2

  • 1Nuffield Laboratory of Ophthalmology, Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

The Yale Journal of Biology and Medicine
|December 21, 2017
PubMed
Summary
This summary is machine-generated.

Gene therapy shows promise for achromatopsia, a rare inherited vision loss. Early childhood treatment is crucial for restoring cone photoreceptor function and integrated vision in patients.

Keywords:
AchromatopsiaCone photoreceptorsGene editingGene therapy

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Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Achromatopsia is a rare, inherited condition causing vision loss due to cone photoreceptor dysfunction.
  • Autosomal recessive mutations in genes like CNGA3 and CNGB3 are common causes.
  • Current research focuses on gene therapy to restore vision.

Purpose of the Study:

  • To review current AAV gene therapy treatments for achromatopsia.
  • To present new data on rescuing a CNGA3 mouse model.
  • To discuss implications for human clinical trials.

Main Methods:

  • Review of existing literature on AAV gene therapy for achromatopsia.
  • In vivo studies using AAV vectors to treat a CNGA3 knockout mouse model.
  • Analysis of cone electrophysiology and behavioral visual tests.

Main Results:

  • Successful rescue of cone electrophysiology and visual function in animal models using AAV gene therapy.
  • Novel data demonstrating rescue in a CNGA3-/- mouse model with rAAV.CBA.CNGA3.
  • Three Phase I/II human clinical trials are underway.

Conclusions:

  • AAV gene therapy is a promising approach for achromatopsia.
  • Restoring integrated visual pathways in adults presents a challenge.
  • Early childhood intervention is likely essential for effective gene therapy outcomes.