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Researchers use patients’ cells to test gene therapy for rare eye disease
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Approach could provide new path for difficult-to-treat forms of Leber congenital amaurosis
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January 28, 2021
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<a href="/about/news-and-events/news?topic=401" hreflang="en">Gene Therapy</a>
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<a href="/about/news-and-events/news?topic=55" hreflang="en">Leber Congenital Amaurosis</a>
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<p>Human retinal organoid. Credit: Anand Swaroop, Ph.D.</p>
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<p>Scientists at the National Eye Institute (NEI) have developed a promising gene therapy strategy for a rare disease that causes severe vision loss in childhood. A form of Leber congenital amaurosis, the disease is caused by autosomal-dominant mutations in the CRX gene, which are challenging to treat with gene therapy. The scientists tested their approach using lab-made retinal tissues built from patient cells, called retinal organoids. This approach, which involved adding copies of the normal gene under its native control mechanism, partially restored CRX function. The study report appears today in Stem Cell Reports. NEI is part of the National Institutes of Health.</p><p>“Our treatment approach, which adds more copies of the normal gene, could potentially treat autosomal-dominant LCA caused by a variety of mutations,” said Anand Swaroop, Ph.D., chief of the NEI Neurobiology, Neurodegeneration and Repair Laboratory and senior author of the report.</p><p>The U.S. Food and Drug Administration approved Luxturna in 2017 for the treatment of LCA patients with mutations in a gene called RPE65. Although hailed as a major advance in gene therapy, Luxturna is ineffective against other forms of LCA, including those caused by autosomal-dominant mutations in CRX.</p><p>The CRX gene encodes a protein (also called CRX) that binds to DNA and instructs the retina’s photoreceptors to make light-sensitive pigments called opsins. Without functional CRX protein, photoreceptors lose their ability to detect light and eventually die.</p><p>Disorders like autosomal-dominant LCA are tricky to treat with gene therapy, because adding more of the normal gene does not always restore function. People with autosomal-dominant mutations still have one normal copy of the gene, but the mutant version of the protein interferes with the normal protein. Sometimes, instead of restoring normal function, simply adding more of the normal protein can enhance the disease in unpredictable ways.</p><p>To explore how gene augmentation – adding copies of the normal gene – would affect autosomal-dominant LCA, Swaroop’s team, developed retinal organoids from two volunteers with LCA and from their unaffected family members. Led by Kamil Kruczek, Ph.D., a postdoctoral fellow in Swaroop’s lab, they built the complex retina-like tissues in several stages, starting with skin cells, inducing the production of mature photoreceptors and other retinal cells with the genetic profile of each volunteer. As expected, patient organoids made far less light-sensing opsin than the organoids made from unaffected family members.</p><p>To carefully control how much CRX gene would be expressed by the recipient photoreceptors, the team re-engineered the CRX promoter so it could be delivered with the CRX gene as part of the gene therapy. A promoter is a neighboring sequence of DNA that controls when and how genes are expressed. The researchers packed the gene and their engineered promoter inside a virus that shuttled them into the organoid photoreceptors.</p><p>The team’s gene augmentation strategy restored some CRX protein function for organoids from both patients, driving expression of opsins in both types of photoreceptors: rods and cones.</p><p>“The fact that this strategy worked for both CRX mutations was pretty exciting,” said Swaroop. “Gene augmentation may be a viable therapy for LCA caused by other autosomal-dominant mutations.”</p><p>“This proof-of-concept gene therapy study is the first step toward a potential treatment for a rare form of LCA,” said Brian Brooks, M.D., NEI clinical director and co-author on the study. “It’s a great example of bench-to-bedside science, when researchers in basic and clinical science collaborate.”</p><p>The current study was funded through the intramural programs of the NEI and the National Institute of Allergy and Infectious Diseases, both part of NIH. Patient samples were collected at the NIH Clinical Center, clinical trial number NCT01432847.</p><p>NEI has protected intellectual property around this technology which is available for licensing and or co-development. Details can be found on the NIH OTT Licensing website: <a href="https://www.techtransfer.nih.gov/tech/tab-4411">Gene Therapy for Treatment of CRX-Autosomal Dominant Retinopathies | Office of Technology Transfer, NIH</a> or by contacting NEI Office of Translational Research <a href="mailto:mala.dutta@nih.gov">mala.dutta@nih.gov</a>.</p><p>Additional authors include: Zepeng Qu, James Gentry, Benjamin Fadl, Linn Gieser, Suja Hiriyanna, Zacahry Batz, Mugdha Samant, Ananya Samanta, Colin Chu, Laura Campello, and Zhijian Wu.</p><p><br>Reference: Kruczek K. Qu Z, Gentry J, Fadl BR, Gieser L, Hiriyanna S, Batz Z, Samant M, Samanta A, Chu CJ, Campello L, Brooks BP, Wu Z, and Swaroop A. “Gene therapy of dominant CRX-Leber congenital amaurosis using patient stem cell-derived retinal organoids.” Stem Cell Reports, January 28, 2020.</p><p>###</p><p>NEI leads the federal government’s research on the visual system and eye diseases. NEI supports basic and clinical science programs to develop sight-saving treatments and address special needs of people with vision loss. For more information, visit <a href="/">https://www.nei.nih.gov</a>.</p><p>About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit <a href="https://www.nih.gov/">https://www.nih.gov/</a>.</p><p>NIH…Turning Discovery Into Health®</p>
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