Spinal Muscular Atrophy

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Qeios · Definition, November 13, 2019 Ope n Pe e r Re vie w on Qe ios Spinal Muscular Atrophy National Institute of Neurological Disorders and Stroke (NINDS) Source National Institute of Neurological Disorders and Stroke (NINDS). Spinal Muscular Atrophy Information Page. Spinal Muscular Atrophy refers to a group of hereditary diseases that damages and kills specialized nerve cells in the brain and spinal cord (called motor neurons). Motor neurons control movement in the arms, legs, face, chest, throat, and tongue, as well as skeletal muscle activity including speaking, walking, swallowing, and breathing. T he most common form of SMA is caused by an abnormal or missing gene known as the survival motor neuron gene 1 (SMN1), which is responsible for the production of a protein essential to motor neurons. T his form of SMA has four types: • T ype l, also called Werdnig-Hoffman disease or infantile-onset SMA, is usually evident before 6 months of age. T he most severely affected children will have reduced movement and chronic shortening of muscles or tendons (called contractures). Other children may have symptoms including reduced muscle tone, lack of tendon reflexes, twitching, skeletal abnormalities, and problems swallowing and feeding. Without treatment, many affected children die before age 2 years. • SMA T ype ll is usually first noticed between the 6 and 18 months of age. Children can sit without support but are unable to stand or walk unaided. Children also may have respiratory difficulties. Life expectancy is reduced but most individuals live into adolescence or young adulthood. • SMA T ype lll (Kugelberg-Welander disease) is seen after age 18 months. Children can walk independently but may have difficulty walking or running, rising from a chair, or climbing stairs. Other complications may include curvature of the spine, contractures, and respiratory infections. With treatment, most individuals can have a normal lfespan. • Individuals with SMA T ype IV develop symptoms after age 21 years, with mild to moderate leg muscle weakness and other symptoms. Qeios ID: 516477 · https://doi.org/10.32388/516477 1/1.

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Voice of the Patient Report for Spinal Muscular Atrophy
V OICE OF THE PATIENT REPORT A summary report resulting from an Externally-Led Patient Focused Drug Development Meeting reflecting the U.S. Food and Drug Administration (FDA) Patient-Focused Drug Development Initiative Spinal Muscular Atrophy (SMA) Externally Led Public Meeting: April 18, 2017 Report Date: January 10, 2018 Title of Resource: The Voice of the Patient Report for Spinal Muscular Atrophy Authors: Contributors to the collection of the information and development of the document are: Cure SMA: Rosangel Cruz, Megan Lenz, Lisa Belter, Kenneth Hobby, Jill Jarecki Medical Writer: Theo Smart Cruz, Lenz, Belter, Hobby, and Jarecki are all employees of Cure SMA and have no disclosures. Cure SMA has received funding from certain companies for work on projects unrelated to the Patient-Focused Drug Development meeting. Funding Received: The report was funded by grants received from the SMA Industry Collaboration to support Cure SMA’s production and execution of the Externally-Led Patient-Focused Drug Development initiative for SMA and the engagement of an outside medical writing professional to assist in the development, editing, and production of The Voice of the Patient report for SMA. The members of the SMA Industry Collaboration are Astellas Pharmaceuticals, AveXis, Inc., Biogen, Genentech/Roche Pharmaceuticals, Cytokinetics Inc., Novartis Pharmaceuticals, and Ionis Pharmaceuticals, Inc. Version Date: January 10, 2018 Revision Statement: This resource document has not been revised and/or modified in any way after January 10, 2018. Statement of Use: Cure SMA has the necessary permissions to submit the “The Voice of the Patient for SMA” report to the U.S. FDA.
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Spinal Muscular Atrophy
Spinal Muscular Atrophy U.S. DEPARTMENT OF HEALTHAND HUMAN SERVICES National Institutes of Health Spinal Muscular Atrophy What is spinal muscular atrophy? pinal muscular atrophy (SMA) is a group Sof hereditary diseases that progressively destroys motor neurons—nerve cells in the brain stem and spinal cord that control essential skeletal muscle activity such as speaking, walking, breathing, and swallowing, leading to muscle weakness and atrophy. Motor neurons control movement in the arms, legs, chest, face, throat, and tongue. When there are disruptions in the signals between motor neurons and muscles, the muscles gradually weaken, begin wasting away and develop twitching (called fasciculations). What causes SMA? he most common form of SMA is caused by Tdefects in both copies of the survival motor neuron 1 gene (SMN1) on chromosome 5q. This gene produces the survival motor neuron (SMN) protein which maintains the health and normal function of motor neurons. Individuals with SMA have insufficient levels of the SMN protein, which leads to loss of motor neurons in the spinal cord, producing weakness and wasting of the skeletal muscles. This weakness is often more severe in the trunk and upper leg and arm muscles than in muscles of the hands and feet. 1 There are many types of spinal muscular atrophy that are caused by changes in the same genes. Less common forms of SMA are caused by mutations in other genes including the VAPB gene located on chromosome 20, the DYNC1H1 gene on chromosome 14, the BICD2 gene on chromosome 9, and the UBA1 gene on the X chromosome. The types differ in age of onset and severity of muscle weakness; however, there is overlap between the types.
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ASAH1 Variant Causing a Mild SMA Phenotype with No Myoclonic Epilepsy: a Clinical, Biochemical and Molecular Study
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