Overview
X-linked intellectual disability due to GRIA3 mutations is a rare genetic condition that primarily affects males. It is caused by changes (mutations) in the GRIA3 gene, which provides instructions for making a protein called glutamate receptor ionotropic AMPA type subunit 3. This protein plays a key role in how brain cells communicate with each other, particularly in learning and memory. When the GRIA3 gene does not work properly, brain development and function are affected, leading to intellectual disability that can range from moderate to severe. Children with this condition typically show delays in reaching developmental milestones such as sitting, walking, and talking. Intellectual disability is the hallmark feature, but some individuals may also experience seizures, behavioral challenges, and difficulties with coordination and movement. Because the gene is located on the X chromosome, boys are more severely affected, while carrier females may have milder symptoms or no symptoms at all. There is currently no cure for this condition. Treatment focuses on managing symptoms and supporting development through therapies such as speech therapy, occupational therapy, physical therapy, and special education programs. Seizures, if present, are managed with anti-seizure medications. Early intervention and a supportive care team can help individuals reach their fullest potential. Research into this condition is ongoing, and understanding of the GRIA3 gene's role in brain function continues to grow.
Key symptoms:
Intellectual disability (moderate to severe)Delayed speech and language developmentDelayed motor milestones such as sitting and walkingSeizures or epilepsyBehavioral difficulties such as hyperactivity or aggressionPoor coordination and balanceDifficulty with fine motor skillsLearning difficultiesLow muscle tone (feeling floppy)Sleep disturbancesRepetitive or self-stimulating behaviorsDifficulty with social interactions
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 due to GRIA3 mutations.
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Specialists
View all specialists →No specialists are currently listed for X-linked intellectual disability due to GRIA3 mutations.
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 due to GRIA3 mutations.
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 type of GRIA3 mutation does my child have, and how might it affect their development?,What therapies should we start right away, and how often should they occur?,Is my child at risk for seizures, and what should I watch for?,Are there any clinical trials or research studies we could participate in?,What educational supports and accommodations should we request at school?,Should other family members be tested to see if they carry the gene change?,What is the long-term outlook for my child's independence and quality of life?
Common questions about X-linked intellectual disability due to GRIA3 mutations
What is X-linked intellectual disability due to GRIA3 mutations?
X-linked intellectual disability due to GRIA3 mutations is a rare genetic condition that primarily affects males. It is caused by changes (mutations) in the GRIA3 gene, which provides instructions for making a protein called glutamate receptor ionotropic AMPA type subunit 3. This protein plays a key role in how brain cells communicate with each other, particularly in learning and memory. When the GRIA3 gene does not work properly, brain development and function are affected, leading to intellectual disability that can range from moderate to severe. Children with this condition typically show
How is X-linked intellectual disability due to GRIA3 mutations inherited?
X-linked intellectual disability due to GRIA3 mutations 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 due to GRIA3 mutations typically begin?
Typical onset of X-linked intellectual disability due to GRIA3 mutations is infantile. Age of onset can vary across affected individuals.