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NIH-led findings point to a biomarker for rare disorders associated with the gene PNPLA6
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May 15, 2024
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<a href="/about/news-and-events/news?topic=56" hreflang="en">Rare Diseases</a>
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<p>Led by researchers at the National Institutes of Health (NIH), a team of scientists has uncovered the complex molecular mechanisms underlying neurodegenerative disorders linked to the gene <em>PNPLA6</em>, which encompass a range of conditions affecting mobility, vision, and hormonal regulation. Published in the journal <a href="https://doi.org/10.1093/brain/awae055">BRAIN</a>, the research offers a deeper understanding of PNPLA6-related conditions at clinical, genetic, and molecular levels, paving the way for tailored diagnostic and therapeutic approaches.</p>
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<img src="https://www.nei.nih.gov/sites/default/files/styles/small/public/2024-05/Thumbnail_Final.jpg?itok=1urgRSWS" alt="PNPLA6 disorders" width="3904" height="1914">
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<p>NTE helps regulate lipid metabolism and membrane stability within neurons. Mutations in the PNPLA6 gene inhibit NTE activity, leading to neurological disorders. Credit: National Eye Institute</p>
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<p><em>PNPLA6</em>-related disorders arise due to mutations that impair the function of an enzyme involved in the regulation of lipid metabolism and membrane stability within neurons, known as neuropathy target esterase (NTE). Inhibition of NTE activity has been linked to neurological disorders such as organophosphate-induced delayed neuropathy, hereditary spastic paraplegia, Boucher-Neuhäuser syndrome and Oliver-McFarlane syndrome.</p><p>Robert Hufnagel, M.D., Ph.D., and colleagues at the NIH’s National Eye Institute (NEI) Ophthalmic and Visual Function Branch, conducted a systematic review and analysis of data from more than 100 patients with <em>PNPLA6</em> mutations. Using neuroimaging, electrophysiological studies (where neurons’ electrical signals are measured and analyzed to understand their function and properties), and genetic testing information, the researchers meticulously evaluated mobility, vision, and hormone expression.</p><p>Results revealed that symptom severity is driven by single substitutions in the DNA code “building blocks” or nucleotides – adenine (A), thymine (T), cytosine (C), and guanine (G), called missense mutations. Each combination of three letters (ATC, or TCG, for example) determines an amino acid, which is the basis of all proteins. When a missense variant occurs, it can affect how the protein functions, potentially leading to health issues.</p><p>How these mutations affect NTE function depends on where they occur in the <em>PNPLA6</em> gene.</p><p>In the study, researchers also recreated mouse models bearing the same missense mutations observed in patients. They then developed a series of tests to categorize the <em>PNPLA6</em> variants according to disease severity. By conducting these tests in mice, scientists noted a correlation between the activity of NTE and the severity of PNPLA6-associated symptoms.</p><p>"In our mouse experiments, we observed that greater NTE activity associated with less profound disease,” said James Liu, a postdoctoral research fellow at NEI and an author of the study. “This knowledge will enable us to learn more about the spectrum of PNPLA6-related diseases in humans and positions us for future clinical trials, potentially using NTE as a biomarker.”</p><p><strong>Reference:</strong></p><p>James Liu, Yi He, Cara Lwin, Marina Han, Bin Guan, Amelia Naik, Chelsea Bender, Nia Moore, Laryssa A Huryn, Yuri V Sergeev, Haohua Qian, Yong Zeng, Lijin Dong, Pinghu Liu, Jingqi Lei, Carl J Haugen, Lev Prasov, Ruifang Shi, Hélène Dollfus, Petros Aristodemou, Yannik Laich, Andrea H Németh, John Taylor, Susan Downes, Maciej R Krawczynski, Isabelle Meunier, Melissa Strassberg, Jessica Tenney, Josephine Gao, Matthew A Shear, Anthony T Moore, Jacque L Duncan, Beatriz Menendez, Sarah Hull, Andrea L Vincent, Carly E Siskind, Elias I Traboulsi, Craig Blackstone, Robert A Sisk, Virginia Miraldi Utz, Andrew R Webster, Michel Michaelides, Gavin Arno, Matthis Synofzik, Robert B Hufnagel, Neuropathy target esterase activity defines phenotypes among <em>PNPLA6</em> disorders, <em>Brain</em>, 2024;, awae055, <a href="https://doi.org/10.1093/brain/awae055">https://doi.org/10.1093/brain/awae055</a></p><p> </p><p>###</p><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/">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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