Overview
Distal triplication 15q syndrome is a very rare chromosomal disorder in which a segment of the long arm (q arm) of chromosome 15, specifically the distal (far end) portion, is present in three copies instead of the usual two. This extra genetic material disrupts normal development and leads to a range of physical and developmental problems. The condition is sometimes referred to as trisomy of the distal 15q region or distal 15q triplication. People with this syndrome typically experience intellectual disability, developmental delays, distinctive facial features, and growth problems. Some individuals may also have heart defects, skeletal abnormalities, and seizures. The severity of symptoms can vary depending on the exact size and location of the triplicated segment. Larger triplications tend to cause more significant health issues. There is currently no cure for distal triplication 15q syndrome. Treatment focuses on managing individual symptoms and supporting development. This may include early intervention therapies such as speech therapy, physical therapy, and occupational therapy. Heart defects or other structural problems may require surgical correction. Regular monitoring by a team of specialists is important to address the various health concerns that can arise throughout life.
Also known as:
Key symptoms:
Intellectual disabilityDevelopmental delaysUnusual facial featuresGrowth delays or short statureLow muscle tone (floppiness)Seizures or epilepsyHeart defects present at birthFeeding difficulties in infancySpeech and language delaysSkeletal abnormalitiesSmall head sizeBehavioral difficultiesVision problemsHearing problemsDelayed motor milestones such as sitting and walking
Clinical phenotype terms (45)— hover any for plain English
Variable
Can be inherited in different ways depending on the underlying gene
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Distal triplication 15q syndrome.
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Specialists
View all specialists →No specialists are currently listed for Distal triplication 15q 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 triplication 15q syndrome.
Community
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Caregiver Resources
NORD Caregiver Resources
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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.What is the exact size and location of the triplication on chromosome 15, and how does that affect my child's prognosis?,Should other family members be tested for chromosomal rearrangements?,What early intervention therapies do you recommend, and how soon should they start?,Are there any heart defects or other organ problems that need to be monitored?,What is the risk of seizures, and what should I do if one occurs?,What educational supports and services should I look into for my child?,Are there any research studies or registries we should consider joining?
Common questions about Distal triplication 15q syndrome
What is Distal triplication 15q syndrome?
Distal triplication 15q syndrome is a very rare chromosomal disorder in which a segment of the long arm (q arm) of chromosome 15, specifically the distal (far end) portion, is present in three copies instead of the usual two. This extra genetic material disrupts normal development and leads to a range of physical and developmental problems. The condition is sometimes referred to as trisomy of the distal 15q region or distal 15q triplication. People with this syndrome typically experience intellectual disability, developmental delays, distinctive facial features, and growth problems. Some indi
At what age does Distal triplication 15q syndrome typically begin?
Typical onset of Distal triplication 15q syndrome is neonatal. Age of onset can vary across affected individuals.