Overview
Maternal uniparental disomy of chromosome X syndrome (also called maternal UPD X) is an extremely rare genetic condition in which a person inherits both copies of the X chromosome from their mother, rather than one X from each parent. Normally, females receive one X chromosome from their mother and one from their father, while males receive an X from their mother and a Y from their father. In this syndrome, the child receives two copies of the mother's X chromosome. This unusual inheritance pattern can cause problems because certain genes on the X chromosome may be imprinted, meaning they are normally only active when inherited from a specific parent. When both copies come from the mother, the balance of gene activity can be disrupted. The clinical features of this condition can vary widely depending on the specific genetic changes involved. Some individuals may experience short stature, developmental delays, learning difficulties, or problems with puberty and reproductive development. Because this condition is so rare, the full range of symptoms is not completely understood. There is no specific cure for maternal UPD X syndrome. Treatment focuses on managing individual symptoms, such as hormone therapy for growth or puberty issues, educational support for learning difficulties, and regular monitoring by a team of specialists. Early diagnosis through genetic testing can help guide appropriate care and support.
Also known as:
Key symptoms:
Short statureDevelopmental delayLearning difficultiesDelayed or abnormal pubertyReproductive or fertility problemsBehavioral differencesMild intellectual disabilityGrowth problems in childhoodPossible Turner syndrome-like features in some cases
Clinical phenotype terms (26)— hover any for plain English
Sporadic
Usually appears on its own, not inherited from a parent
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for Maternal uniparental disomy of chromosome X syndrome.
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Specialists
View all specialists →No specialists are currently listed for Maternal uniparental disomy of chromosome X 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 Maternal uniparental disomy of chromosome X syndrome.
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Caregiver Resources
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Social Security Disability
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Questions for your doctor
Bring these to your next appointment
- Q1.What specific symptoms should I watch for as my child grows?,Will my child need growth hormone therapy or other hormone treatments?,How will this condition affect my child's puberty and future fertility?,What educational supports should we put in place now?,How often should we schedule follow-up visits with specialists?,Is there a risk of this happening again in future pregnancies?,Are there any research studies or registries we should consider joining?
Common questions about Maternal uniparental disomy of chromosome X syndrome
What is Maternal uniparental disomy of chromosome X syndrome?
Maternal uniparental disomy of chromosome X syndrome (also called maternal UPD X) is an extremely rare genetic condition in which a person inherits both copies of the X chromosome from their mother, rather than one X from each parent. Normally, females receive one X chromosome from their mother and one from their father, while males receive an X from their mother and a Y from their father. In this syndrome, the child receives two copies of the mother's X chromosome. This unusual inheritance pattern can cause problems because certain genes on the X chromosome may be imprinted, meaning they are
How is Maternal uniparental disomy of chromosome X syndrome inherited?
Maternal uniparental disomy of chromosome X syndrome follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.