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NIH researchers develop gene therapy for rare ciliopathy
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Gene augmentation rescues cilia defects in light-sensing cells derived from patients with blinding disease
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September 8, 2022
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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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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2022-09/NPHP5%20treatment%20panel.png?itok=gwuSVQuj" alt="Panel of 6 NPHP5 retinal organoid micrographs." width="1174" height="832">
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<p>Treating patient-derived retinal organoids with AAV-NPHP5 restores rhodopsin localization in photoreceptor outer segments. Top: Retinoids stained for DNA (blue), NPHP5 (red), and rhodopsin (green). Below: Close-up view of organoid photoreceptor layer stained green for rhodopsin. Adapted from Kruczek et al, 2022. Image credit: Anand Swaroop, Ph.D. and Kamil Kruczek, Ph.D.</p>
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<p>Researchers from the National Eye Institute (NEI) have developed a gene therapy that rescues cilia defects in retinal cells affected by a type of Leber congenital amaurosis (LCA), a disease that causes blindness in early childhood. Using patient-derived retina organoids (also known as retinas-in-a-dish), the researchers discovered that a type of LCA caused by mutations in the <em>NPHP5</em> (also called <em>IQCB1</em>) gene leads to severe defects in the primary cilium, a structure found in nearly all cells of the body. The findings not only shed light on the function of NPHP5 protein in the primary cilium, but also led to a potential treatment for this blinding condition. NEI is part of the National Institutes of Health.</p>
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<p>"It’s so sad to see little kids going blind from early onset LCA. NPHP5 deficiency causes early blindness in its milder form, and in more severe forms, many patients also exhibit kidney disease along with retinal degeneration,” said the study’s lead investigator, Anand Swaroop, Ph.D., senior investigator at the NEI Neurobiology Neurodegeneration and Repair Laboratory. “We’ve designed a gene therapy approach that could help prevent blindness in children with this disease and one that, with additional research, could perhaps even help treat other effects of the disease."</p>
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<p>LCA is a rare genetic disease that leads to degeneration of the light-sensing retina at the back of the eye. Defects in at least 25 different genes can cause LCA. While there is an available gene therapy treatment for one form of LCA, all other forms of the disease have no treatment. The type of LCA caused by mutations in <em>NPHP5</em> is relatively rare. It causes blindness in all cases, and in many cases it can also lead to failure of the kidneys, a condition called <a href="https://rarediseases.info.nih.gov/diseases/322/senior-loken-syndrome">Senior-Løken Syndrome</a>.</p>
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<p>Three post-doctoral fellows, Kamil Kruczek, Ph.D., Zepeng Qu, Ph.D., and Emily Welby, Ph.D., together with other members in the research team collected stem cell samples from two patients with <em>NPHP5</em> deficiency at the NIH Clinical Center. These stem cell samples were used to generate retinal organoids, cultured tissue clusters that possess many of the structural and functional features of actual, native retina. Patient-derived retinal organoids are particularly valuable because they closely mimic the genotype and retinal disease presentation in actual patients and provide a “human-like” tissue environment for testing therapeutic interventions, including gene therapies. As in the patients, these retinal organoids showed defects in the photoreceptors, including loss of the portion of the photoreceptor called "outer segments."</p>
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<p>In a healthy retina, photoreceptor outer segments contain light-sensing molecules called opsins. When the outer segment is exposed to light, the photoreceptor initiates a nerve signal that travels to the brain and mediates vision. The photoreceptor outer segment is a special type of primary cilium, an ancient structure found in nearly all animal cells.</p>
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<p>In a healthy eye, NPHP5 protein is believed to sit at a gate-like structure at the base of the primary cilium that helps filter proteins that enter the cilium. Previous studies in mice have shown that NPHP5 is involved in the cilium, but researchers don’t yet know the exact role of NPHP5 in the photoreceptor cilium, nor is it clear exactly how mutations affect the protein’s function.</p>
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<p>In the present study, researchers found reduced levels of NPHP5 protein within the patient-derived retinal organoid cells, as well as reduced levels of another protein called CEP-290, which interacts with NPHP5 and forms the primary cilium gate. (Mutations in <em>CEP-290</em> constitute the most common cause of LCA.) In addition, photoreceptor outer segments in the retinal organoids were completely missing and the opsin protein that should have been localized to the outer segments was instead found elsewhere in the photoreceptor cell body.</p>
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<p>When the researchers introduced an adeno-associated viral (AAV) vector containing a functional version of <em>NPHP5</em> as a gene therapy vehicle, the retinal organoids showed a significant restoration of opsin protein concentrated in the proper location in outer segments. The findings also suggest that functional NPHP5 may have stabilized the primary cilium gate.</p>
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<p>The study was funded by the NEI Intramural program. Patient samples were collected at the NIH Clinical Center.</p>
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<p>Reference: Kruczek K, Qu Z, Welby E, et al. "In vitro modeling and rescue of ciliopathy associated with IQCB1/NPHP5 mutations using patient-derived cells." Stem Cell Reports. Sept 8, 2022. doi:<a href="https://doi.org/10.1016/j.stemcr.2022.08.006">10.1016/j.stemcr.2022.08.006</a></p>
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<p>###</p>
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<p>NEI leads the federal government’s efforts to eliminate vision loss and improve quality of life through vision research…driving innovation, fostering collaboration, expanding the vision workforce, and educating the public and key stakeholders. NEI supports basic and clinical science programs to develop sight-saving treatments and to broaden opportunities for people with vision impairment. For more information, visit <a href="/">https://www.nei.nih.gov</a>.</p>
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<p>About the NIH Clinical Center: The NIH Clinical Center is the world’s largest hospital entirely devoted to clinical research. It is a national resource that makes it possible to rapidly translate scientific observations and laboratory discoveries into new approaches for diagnosing, treating, and preventing disease. Over 1,600 clinical research studies are conducted at the NIH Clinical Center, including those focused on cancer, infectious diseases, blood disorders, heart disease, lung disease, alcoholism and drug abuse. For more information about the Clinical Center, visit: <a href="https://www.cc.nih.gov/">https://www.cc.nih.gov/</a>.</p>
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<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>
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