Overview
X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome is an extremely rare genetic condition that affects brain development, bone growth, and intellectual function. The name describes its three main features: intellectual disability (difficulty with learning and thinking), cerebellar hypoplasia (underdevelopment of the part of the brain that controls balance and coordination), and spondylo-epiphyseal dysplasia (abnormal development of the bones in the spine and the ends of long bones). Because it is X-linked, it primarily affects males, while females may be carriers with milder or no symptoms. Children with this condition typically show delays in reaching developmental milestones such as sitting, walking, and talking. They may have short stature due to the bone abnormalities, problems with balance and coordination from the underdeveloped cerebellum, and varying degrees of intellectual disability. Some individuals may also have distinctive facial features and joint problems. There is currently no cure for this syndrome. Treatment focuses on managing symptoms and supporting development. This may include physical therapy, occupational therapy, speech therapy, special education services, and orthopedic care for bone and joint problems. A team of specialists working together provides the best outcomes for affected individuals.
Key symptoms:
Intellectual disability or learning difficultiesPoor balance and coordinationShort statureDelayed motor milestones like sitting and walkingSpeech and language delaysAbnormal curvature of the spineJoint stiffness or limited range of motionUnderdevelopment of the cerebellum (back part of the brain)Abnormal bone development in the spine and limbsLow muscle toneDistinctive facial featuresDifficulty with fine motor skillsWaddling or unsteady gait
Clinical phenotype terms (50)— 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 intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome.
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Specialists
View all specialists →No specialists are currently listed for X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome.
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 intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
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 genetic cause of my child's condition, and should other family members be tested?,What therapies should we start right away to support my child's development?,How often should we have brain imaging and skeletal X-rays to monitor for changes?,Are there any clinical trials or research studies we could participate in?,What orthopedic complications should we watch for as my child grows?,What educational supports and accommodations should we request at school?,What is the long-term outlook for my child's independence and quality of life?
Common questions about X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome
What is X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome?
X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome is an extremely rare genetic condition that affects brain development, bone growth, and intellectual function. The name describes its three main features: intellectual disability (difficulty with learning and thinking), cerebellar hypoplasia (underdevelopment of the part of the brain that controls balance and coordination), and spondylo-epiphyseal dysplasia (abnormal development of the bones in the spine and the ends of long bones). Because it is X-linked, it primarily affects males, while females may
How is X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome inherited?
X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome follows a x-linked recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome typically begin?
Typical onset of X-linked intellectual disability-cerebellar hypoplasia-spondylo-epiphyseal dysplasia syndrome is infantile. Age of onset can vary across affected individuals.