News Release
Friday, December 4, 2020
Previously unknown genetic connection could be a target for gene therapy.
A study led by researchers at the National Institutes of Health has made a surprising connection between frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS), two disorders of the nervous system, and the genetic mutation normally understood to cause Huntingtons disease.
This large, international project, which included a collaboration between the National Institute of Neurological Disorders and Stroke (NINDS) and the National Institute on Aging (NIA), opens a potentially new avenue for diagnosing and treating some individuals with FTD or ALS.
Several neurological disorders have been linked to repeat expansions, a type of mutation that results in abnormal repetition of certain DNA building blocks. For example, Huntingtons disease occurs when a sequence of three DNA building blocks that make up the gene for a protein called huntingtin repeats many more times than normal. These repeats can be used to predict whether someone will develop the illness and even when their symptoms are likely to appear, because the more repeats in the gene, the earlier the onset of disease.
It has been recognized for some time that repeat expansion mutations can give rise to neurological disorders, said Sonja Scholz, M.D., Ph.D., investigator, NINDS Intramural Research Program. But screening for these mutations throughout the entire genome has traditionally been cost-prohibitive and technically challenging.
Taking advantage of technology available at NIH, the researchers screened the entire genomes from large cohorts of FTD/ALS patients and compared them to those of age-matched healthy individuals. While several patients had a well-established genetic marker for FTD/ALS, a small subset surprisingly had the same huntingtin mutation normally associated with Huntingtons disease. Remarkably, these individuals did not show the classical symptoms of Huntingtons but rather those of ALS or FTD.
None of these patients symptoms would have clued their physicians into thinking that the underlying genetic cause was related to the repeat expansion we see in Huntingtons disease, said Dr. Scholz.
She continued by explaining that whole genome sequencing is changing how neurological patients can be diagnosed. Traditionally, this has been based on which disease best fit the overall symptoms with treatment aimed at managing those symptoms as best as possible. Now, clinicians can generate genetically defined diagnoses for individual patients, and these do not always align with established symptom-based neurological conditions.
Our patients simply dont match a textbook definition of disease when it comes to which mutation produces which symptoms. Here we have patients carrying a pathogenic huntingtin mutation but who present with FTD or ALS symptoms, said Dr. Scholz.
One implication of these findings is that, if successful, these therapies could be applied to the small subset of FTD and ALS patients with that mutation as well. The researchers note that, while the number of FTD/ALS patients seen with the Huntingtons-linked mutation is small (roughly 0.12-0.14%), adding genetic screening for the mutation to the standard diagnostic procedure for patients showing symptoms of FTD or ALS should be considered.
Because gene therapy targeting this mutation is already in advanced clinical trials, our work offers real hope to the small number of FTD and ALS patients who carry this mutation, said Bryan Traynor, M.D., Ph.D., senior investigator, NIA Intramural Research Program. This type of large-scale international effort showcases the power of genomics in identifying the molecular causes of neurodegenerative diseases and paves the way for personalized medicine.
This research was supported by the Intramural Research Program of the National Institutes of Health (National Institute on Aging and National Institute of Neurological Disorders and Stroke; project numbers 1ZIAAG000935, 1ZIANS003154, 1ZIANS003033, 1ZIANS003034), the Intramural Research Program of the National
NINDSis the nations leading funder of research on the brain and nervous system.The mission of NINDS is to seek fundamental knowledge about the brain and nervous system and to use that knowledge to reduce the burden of neurological disease.
About the National Institute on Aging (NIA): NIA leads the U.S. federal government effort to conduct and support research on aging and the health and well-being of older people. Learn more about age-related cognitive change and neurodegenerative diseases via NIAs Alzheimer's and related Dementias Education and Referral (ADEAR) Center website. For information about a broad range of aging topics, visit the main NIA website and stay connected.
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 http://www.nih.gov.
NIHTurning Discovery Into Health
Dewan R. et al. Pathogenic Huntingtin Repeat Expansions in Patients with Frontotemporal Dementia and Amyotrophic Lateral Sclerosis. Neuron. November 25, 2020. DOI:10.1016/j.neuron.2020.11.005
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NIH researchers link cases of ALS and FTD to a mutation associated with Huntington's disease - National Institutes of Health
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