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Researchers identify genetic mutation causing rare form of spinal muscular atrophy

Scientists have confirmed that mutations of a gene are responsible for some cases of a rare, inherited disease that causes progressive muscle degeneration and weakness: spinal muscular atrophy with lower extremity predominance, also known as SMA-LED.

“Typical spinal muscular atrophies begin in infancy or early childhood and are fatal, involving all motor neurons, but SMA-LED predominantly affects nerve cells controlling muscles of the legs. It is not fatal and the prognosis is good, although patients usually are moderately disabled and require assistive devices such as bracing and wheelchairs throughout their lives,” said Robert H. Baloh, MD, PhD, director of Cedars-Sinai Medical Center’s Neuromuscular Division and senior author of a Neurology article describing the new findings on DYNC1H1.

It is a molecule inside cells that acts as a motor to transport cellular components. Using cells cultured from patients, Baloh’s group showed that the mutation disrupts this motor’s function. The researchers found that some subjects with mutations had global developmental delay in addition to weakness, indicating the brain also is involved.

“Our observations suggest that a range of DYNC1H1-related disease exists in humans – from a widespread neurodevelopmental abnormality of the central nervous system to more selective involvement of certain motor neurons, which manifests as spinal muscular atrophy,” Baloh said.

He pointed out that while this molecule is responsible for some inheritable cases of spinal muscular atrophy with lower extremity predominance, the genetic mutation is absent in others. The search continues, therefore, to find other culprit genetic mutations and develop biological therapies to correct them.

“Although this is a rare form of motor neuron disease, it tells us that dynein function – the molecular motor – is crucial for the development and maintenance of motor neurons, which we hope will provide insight into the common form of spinal muscular atrophy and also amyotrophic lateral sclerosis,” Baloh said. ALS (also known as Lou Gehrig’s disease) is a progressive neurodegenerative disease that affects nerve cells in the brain and spinal cord. 

Baloh, an expert in treating and studying neuromuscular and neurodegenerative diseases, joined Cedars-Sinai in early 2012, working with other physicians and scientists in the Department of Neurology and the Regenerative Medicine Institute to establish one of the most comprehensive neuromuscular disease treatment and research teams in California.

The study was supported by the BJC Institute for Clinical and Translational Sciences, the Children’s Discovery Institute, the National Institutes of Health, the Hope Center for Neurological Disorders, the Muscular Dystrophy Association, the Charcot Marie Tooth Association, the Columbia University Motor Neuron Center and the Burroughs Wellcome Fund.

One of the article’s other authors reports serving on the scientific advisory board of the Myositis Association; receiving revenue and speaker honoraria from Athena; owning stock in Johnson & Johnson; directing the Washington University Neuromuscular Clinical Laboratory, and receiving research support from NIH, MDA and other groups.

Citation: Neurology, March 28, 2012, published online ahead of print: “Mutations in the tail domain of DYNC1H1 cause dominant spinal muscular atrophy.”

Sandy Van | Cedars-Sinai News
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