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Investigating mechanistic drivers of MuSK autoimmunity

Myasthenia gravis (MG) is a rare neurological disease characterized by muscle weakness. This disease is caused by antibodies that bind to specific proteins expressed on muscle cells, blocking the communication between nerves and muscles. In a subset of patients, such antibodies recognize a protein called muscle-specific tyrosine kinase (MuSK). In MuSK MG, muscle weakness is typically severe, and most patients experience difficulty breathing, swallowing, and talking. Importantly, these symptoms respond well to rituximab, a medication that reduces the number of white blood cells producing anti-MuSK antibodies. Following rituximab, most patients show no symptoms for several months. But despite such striking improvements, the disease eventually reappears, requiring hospitalization and additional treatments. Researchers have discovered the precise mechanism through which anti-MuSK antibodies cause muscle weakness. These advances notwithstanding, there remain unknowns about the cause and persistence of the disease, hindering a definitive cure. Our project will investigate which factors contribute to the chronic course of MuSK MG. First, we will study the cells that cause the disease and how they mature to produce the antibodies. Second, we will examine whether gut bacteria can mimic MuSK and increase the production of anti-MuSK antibodies, a process known as “molecular mimicry”. Our research is designed to provide new insights that could lead to better treatments for MuSK MG.
Digital Object Identifier (DOI)
Grantee: Gianvito Masi, MD
Grant type: Development Grant
Award total: $207,815.00
Institution: Yale University
Country: USA