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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/news-releases">News Releases</a></div> <div class="l-region l-region--section-header">
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<div about="/news-events/news-releases/better-mouse-model-built-enable-precision-medicine-research-alzheimers" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-news-release news-release view-mode-full node--full node--nih-news-release--full clearfix">
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<p class="publishdate"><span class="tag-term">News Release</span></p><p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2018-12-27T11:00:00-05:00" class="date-display-single">Thursday, December 27, 2018</span></p><h1>Better mouse model built to enable precision-medicine research for Alzheimer's</h1><p class="subtitle">
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NIH-funded team shows that introducing genetic diversity improves translatability.</p><p>Incorporating genetic diversity into a mouse model of Alzheimer’s disease resulted in greater overlap with the genetic, molecular and clinical features of this pervasive human disease, according to a study funded by the National Institute on Aging (NIA), part of the National Institutes of Health. The study also suggests that adding genetic diversity may be key to improving the predictive power of studies using mouse models and increasing their usability for precision medicine research for Alzheimer’s. This research comes out of the newly established Resilience-Alzheimer’s Disease Consortium (Resilience-AD) and was published online Dec. 27, 2018 in the journal <em>Neuron.</em></p>
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<p>“This is the first study to show that you can replicate many of the molecular features of Alzheimer’s disease in a genetically diverse mouse model,” said NIA Director <a href="https://www.nia.nih.gov/about/staff/hodes-richard">Richard J. Hodes, M.D.</a> “It points to a strategy for better use of mouse models for precision medicine research—both basic and translational—for Alzheimer’s disease.”</p>
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<p>Alzheimer's disease is an irreversible, progressive brain disorder that slowly destroys memory and thinking skills and, eventually, the ability to carry out simple tasks. As many as 5.5 million Americans age 65 and older are estimated to be living with Alzheimer’s disease, the most common form of dementia.</p>
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<p>A key tool among the multiple efforts to find a treatment or cure for Alzheimer’s, mouse models allow researchers to explore genetic, molecular and even behavioral aspects of disease that can’t be done in humans. The researchers, led by <a href="https://www.jax.org/research-and-faculty/faculty/catherine-kaczorowski">Catherine C. Kaczorowski, Ph.D.</a>, an associate professor and Evnin Family Chair in Alzheimer’s Research at the Jackson Laboratory, Bar Harbor, Maine, and her graduate student, first author Sarah Neuner, noted that mouse models with Alzheimer’s mutations are important for defining high-risk as well as protective genes and disease mechanisms, and to efficiently test new potential interventions and therapeutics.</p>
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<p>In this study, the researchers tested the idea that including more real-world genetic variation into a mouse model of Alzheimer’s would improve the translatability of the model—meaning that findings would be more likely to parallel the many complex features of the human disease. To do this, they combined a well-established mouse model of familial Alzheimer’s (5XFAD) with a genetically diverse set of mice. All members of this family of transgenic mice therefore carry the high-risk human familial Alzheimer’s genes but otherwise have very different genetic make-up. The detailed analysis of this new panel of mice (referred collectively as AD-BXD), showed a high degree of overlap with the genetic, molecular, pathologic and cognitive features of Alzheimer’s. Moreover, in the presence of identical Alzheimer’s risk genes, the differences in genetic background led to profound differences in the onset and severity of the pathologic and cognitive symptoms of Alzheimer’s.</p>
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<p>Through a series of comparative analyses, the research team also discovered that one mouse strain, C57BL/6J, commonly used to generate Alzheimer’s transgenic mouse models, harbors resilience factors that lessen the impact of Alzheimer’s risk factor genes. This new finding has two important implications. First, it suggests that Alzheimer’s mouse models with this genetic background may not be suitable for testing of novel therapeutic agents and may explain the poor predictive power of drug screening studies using the current Alzheimer’s transgenic mouse models. Second, by using the AD-BXD panel, the protective genes from the C57BL/6J strain and their mechanisms can be precisely identified leading to new candidate targets for Alzheimer’s prevention.</p>
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<p>The authors noted that the AD-BXD panel represents a new tool for better understanding the heterogeneous nature of normal aging and Alzheimer’s, and for precisely identifying molecular factors that lead to resilience to genetic and environmental disease risk factors.</p>
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||
<p>“The ability to model genetic diversity and its impact on multiple aspects of disease risk and resilience in transgenic mice in a robust and reproducible way will enable the research community to learn a lot more about the complex nature of Alzheimer’s a lot faster,” said <a href="https://www.nia.nih.gov/about/staff/petanceska-suzana">Suzana Petanceska, Ph.D.</a>, program director in the NIA Division of Neuroscience, who oversees the Resilience-AD program. “This new resource adds to the series of new NIA/NIH programs generating data, analytical and research tools needed to enable more efficient and predictive drug development for Alzheimer’s.”</p>
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<p>Kaczorowski’s team is one of 10 multidisciplinary and multi-institutional research teams supported through the Resilience-AD program, one of a series of NIA-supported open-science consortia. Resilience-AD, launched in 2017, aims to address why and how some individuals remain dementia-free despite being at high genetic or biomarker risk of Alzheimer’s. The program was developed to generate deeper mechanistic understanding of how genetic and environmental factors interact and lead to cognitive resilience in individuals who are at high risk for Alzheimer’s disease and to identify novel therapeutic targets for pharmacologic and nonpharmacologic prevention strategies.</p>
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<p>This study was funded in part by NIH grants R01AG054180, R01AG057914, F31AG050357, and R01DK102918.</p>
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<p><strong>About the National Institute on Aging (NIA)</strong>: The NIA leads the federal government effort conducting and supporting research on aging and the health and well-being of older people. The NIA provides information on age-related cognitive change and neurodegenerative disease specifically at its Alzheimer’s Disease Education and Referral (ADEAR) Center at <a href="http://www.nia.nih.gov/Alzheimers">www.nia.nih.gov/Alzheimers</a>. For more on health and on aging generally, go to <a href="http://www.nia.nih.gov">www.nia.nih.gov</a>. To sign up for e-mail alerts about new findings or publications, please visit either website.</p>
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<p><strong>About the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK):</strong> The NIDDK, a component of the National Institutes of Health (NIH), conducts and supports research on diabetes and other endocrine and metabolic diseases; digestive diseases, nutrition and obesity; and kidney, urologic and hematologic diseases. Spanning the full spectrum of medicine and afflicting people of all ages and ethnic groups, these diseases encompass some of the most common, severe, and disabling conditions affecting Americans. For more information about the NIDDK and its programs, see <a href="http://www.niddk.nih.gov">http://www.niddk.nih.gov</a>.</p><p><strong>About the National Institutes of Health (NIH):</strong>
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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="/">www.nih.gov</a>.</p>
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<h3>Reference</h3><p>Neuner et al. Harnessing Genetic Complexity to Enhance Translatability of Alzheimer’s Disease Mouse Models: A Path toward Precision Medicine. <em>Neuron</em>. 2018 Dec. 27. <a href="https://doi.org/10.1016/j.neuron.2018.11.040">https://doi.org/10.1016/j.neuron.2018.11.040</a></p></div>
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<h3>Additional Resources</h3><p><a href="https://www.genome.gov/10005834/background-on-mouse-as-a-model-organism/">Background on mouse as a model organism</a> – Scientists from a wide range of biomedical fields have gravitated to the mouse because of its close genetic and physiological similarities to humans, as well as the ease with which its genome can be manipulated and analyzed.</p>
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<p><a href="https://www.jax.org/personalized-medicine/why-mouse-genetics">The mouse as a model for human disease</a> – The laboratory mouse is a powerful tool that scientists use to model human diseases and conditions in the search for better treatments and cures for humankind's most devastating genetic diseases.</p>
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<p><a href="https://model-ad.org/">MODEL-AD consortium</a> – The Model Organism Development & Evaluation for Late-Onset Alzheimer’s Disease initiative works to develop, validate and make broadly available the next generation of animal models for late-onset AD and to enable rigorous and reproducible preclinical testing of novel therapeutic agents.</p>
|
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<p><a href="https://alzped.nia.nih.gov/">AlzPED</a> – The Alzheimer’s Disease Pre-Clinical Efficacy Database is a publicly available and searchable database designed to improve the reproducibility and translatability of animal model efficacy testing studies by hosting curated summaries of published studies and providing a platform for creating citable reports/preprints of unpublished studies, including studies with negative findings.</p></div>
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