Overview
X-linked complicated spastic paraplegia type 1 (also known as SPG1 or spastic paraplegia 1) is a rare inherited neurological condition that primarily affects males. It is caused by mutations in the L1CAM gene on the X chromosome. This gene plays a critical role in the development of the nervous system, particularly in how nerve cells grow, connect, and communicate with each other. The hallmark feature of this condition is progressive stiffness and weakness in the legs (spastic paraplegia), but because it is a "complicated" form, it comes with additional neurological problems. These can include intellectual disability, difficulty speaking, hydrocephalus (excess fluid in the brain), and problems with the structure of the brain such as absence or thinning of the corpus callosum (the bridge connecting the two halves of the brain). Some affected individuals may also have adducted (inward-turning) thumbs, which is a distinctive feature associated with L1CAM mutations. Symptoms typically begin in infancy or early childhood. The severity can vary widely, even among family members carrying the same mutation. There is currently no cure for SPG1. Treatment focuses on managing symptoms and maximizing quality of life through physical therapy, medications to reduce muscle stiffness, surgical interventions for hydrocephalus if needed, and educational support for intellectual challenges. A team of specialists is usually needed to provide comprehensive care.
Also known as:
Key symptoms:
Progressive leg stiffness and weaknessDifficulty walking or inability to walkIntellectual disabilityHydrocephalus (excess fluid in the brain)Adducted (inward-turning) thumbsSpeech and language delaysAbsent or thin corpus callosum in the brainIncreased muscle tone in the legs (spasticity)Difficulty with fine motor skillsSeizures in some casesUrinary problemsDelayed developmental milestonesPoor coordination and balance
Clinical phenotype terms (9)— hover any for plain English
X-linked recessive
Carried on the X chromosome; typically affects males more than females
Infantile
Begins in infancy, roughly 1 month to 2 years old
Treatments
No FDA-approved treatments are currently listed for X-linked complicated spastic paraplegia type 1.
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Specialists
View all specialists →No specialists are currently listed for X-linked complicated spastic paraplegia type 1.
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to X-linked complicated spastic paraplegia type 1.
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Caregiver Resources
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Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.What is the specific L1CAM mutation in our family, and what does it mean for severity?,Does my child have hydrocephalus, and will a shunt be needed?,What therapies should we start right away to support development?,Are there clinical trials or research studies we should know about?,What are the signs of a medical emergency I should watch for?,Should other family members be tested for carrier status?,What is the long-term outlook for mobility and independence in my child's case?
Common questions about X-linked complicated spastic paraplegia type 1
What is X-linked complicated spastic paraplegia type 1?
X-linked complicated spastic paraplegia type 1 (also known as SPG1 or spastic paraplegia 1) is a rare inherited neurological condition that primarily affects males. It is caused by mutations in the L1CAM gene on the X chromosome. This gene plays a critical role in the development of the nervous system, particularly in how nerve cells grow, connect, and communicate with each other. The hallmark feature of this condition is progressive stiffness and weakness in the legs (spastic paraplegia), but because it is a "complicated" form, it comes with additional neurological problems. These can includ
How is X-linked complicated spastic paraplegia type 1 inherited?
X-linked complicated spastic paraplegia type 1 follows a x-linked recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does X-linked complicated spastic paraplegia type 1 typically begin?
Typical onset of X-linked complicated spastic paraplegia type 1 is infantile. Age of onset can vary across affected individuals.