Overview
Distal Xq28 microduplication syndrome is a rare genetic condition caused by a small extra copy (duplication) of genetic material at the far end of the X chromosome, in a region called Xq28. This syndrome primarily affects males more severely than females, since males have only one X chromosome. The duplicated region contains several genes that play important roles in brain development and function, which is why the condition mainly causes neurological and developmental problems. Children with this syndrome typically show intellectual disability that ranges from mild to severe, delayed speech and language development, and behavioral difficulties that may include features of autism spectrum disorder. Many affected individuals also experience seizures or epilepsy, low muscle tone (hypotonia) in infancy, and distinctive facial features that may be subtle. Some children have recurrent infections due to immune system problems. There is currently no cure for distal Xq28 microduplication syndrome. Treatment focuses on managing individual symptoms through therapies such as speech therapy, occupational therapy, physical therapy, anti-seizure medications when needed, and behavioral support. Early intervention services can help children reach their full developmental potential. The condition is lifelong, and the level of support needed varies widely from person to person depending on the severity of symptoms.
Also known as:
Key symptoms:
Intellectual disabilityDelayed speech and language developmentLow muscle tone in infancySeizures or epilepsyBehavioral problemsFeatures of autism spectrum disorderDistinctive facial featuresDelayed motor milestones such as sitting and walkingRecurrent infectionsFeeding difficulties in infancyPoor coordinationAttention difficultiesSleep problemsAnxiety or mood changes
Clinical phenotype terms (43)— hover any for plain English
X-linked dominant
Carried on the X chromosome; a single copy can cause the condition
Infantile
Begins in infancy, roughly 1 month to 2 years old
Treatments
No FDA-approved treatments are currently listed for Distal Xq28 microduplication syndrome.
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Specialists
View all specialists →No specialists are currently listed for Distal Xq28 microduplication 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 Distal Xq28 microduplication syndrome.
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
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.Exactly which genes are included in my child's duplication, and what does that mean for their specific symptoms?,What therapies should we start right away, and how often should they occur?,Does my child need seizure medication, and what are the side effects to watch for?,Should my child be evaluated by an immunologist for recurrent infections?,What is the chance that future children could also have this condition, and should family members be tested?,What educational supports and accommodations should we request at school?,Are there any clinical trials or new research studies that might be relevant for my child?
Common questions about Distal Xq28 microduplication syndrome
What is Distal Xq28 microduplication syndrome?
Distal Xq28 microduplication syndrome is a rare genetic condition caused by a small extra copy (duplication) of genetic material at the far end of the X chromosome, in a region called Xq28. This syndrome primarily affects males more severely than females, since males have only one X chromosome. The duplicated region contains several genes that play important roles in brain development and function, which is why the condition mainly causes neurological and developmental problems. Children with this syndrome typically show intellectual disability that ranges from mild to severe, delayed speech
How is Distal Xq28 microduplication syndrome inherited?
Distal Xq28 microduplication syndrome follows a x-linked dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Distal Xq28 microduplication syndrome typically begin?
Typical onset of Distal Xq28 microduplication syndrome is infantile. Age of onset can vary across affected individuals.