Maternal uniparental disomy of chromosome X syndrome

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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
Shield chestHP:0000914Rocker bottom footHP:0001838
Inheritance

Sporadic

Usually appears on its own, not inherited from a parent

Age of Onset

Variable

Can begin at different ages, from infancy through adulthood

Orphanet ↗NORD ↗

Treatments

No FDA-approved treatments are currently listed for Maternal uniparental disomy of chromosome X syndrome.

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No specialists are currently listed for Maternal uniparental disomy of chromosome X syndrome.

View NORD Rare Disease Centers ↗Undiagnosed Disease Network ↗

Treatment Centers

8 centers
🏥 NORD

Baylor College of Medicine Rare Disease Center

Baylor College of Medicine

📍 Houston, TX

🏥 NORD

Stanford Medicine Rare Disease Center

Stanford Medicine

📍 Stanford, CA

🔬 UDN

NIH Clinical Center Undiagnosed Diseases Program

National Institutes of Health

📍 Bethesda, MD

🔬 UDN

UCLA UDN Clinical Site

UCLA Health

📍 Los Angeles, CA

🔬 UDN

Baylor College of Medicine UDN Clinical Site

Baylor College of Medicine

📍 Houston, TX

🔬 UDN

Harvard/MGH UDN Clinical Site

Massachusetts General Hospital

📍 Boston, MA

🏥 NORD

Mayo Clinic Center for Individualized Medicine

Mayo Clinic

📍 Rochester, MN

👤 Mayo Clinic Center for Individualized Medicine

🏥 NORD

UCLA 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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Community

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Caregiver Resources

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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.