Global Spastic Paraplegia 50 (GSP50) is a rare genetic disorder that affects the central nervous system, leading to progressive weakness and stiffness in the legs. This article aims to shed light on the causes, symptoms, and management strategies for individuals and families affected by GSP50.

Causes: Global Spastic Paraplegia 50 is caused by mutations in the AP4B1 gene, which provides instructions for making a protein involved in the formation of a complex called the adaptor protein 4 (AP-4) complex. This complex plays a crucial role in the transport of proteins within cells, particularly in neurons. Mutations in the AP4B1 gene disrupt this transport process, leading to abnormalities in the development and function of the nervous system.

Symptoms: Symptoms of GSP50 typically manifest during infancy or early childhood and worsen over time. Common symptoms include progressive weakness and stiffness in the legs (spastic paraplegia), difficulty walking, muscle spasms, and exaggerated reflexes. Some individuals may also experience intellectual disability, seizures, or problems with speech and language development.

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