Overview
12q15q21 microdeletion syndrome is a very rare genetic condition caused by a small missing piece (microdeletion) of chromosome 12, specifically in the region between bands q15 and q21. This means that a tiny segment of genetic material that normally provides instructions for the body's development is absent. Because several genes are lost in this deletion, the syndrome can affect multiple body systems. Children born with this condition typically show developmental delay, intellectual disability, and distinctive facial features. Growth problems, including short stature, may also be present. Some individuals may have behavioral challenges, speech and language delays, and difficulties with fine motor skills. The severity of symptoms can vary depending on the exact size and location of the deleted segment — larger deletions tend to cause more significant effects. There is currently no cure for 12q15q21 microdeletion syndrome. Treatment focuses on managing individual symptoms and supporting development. This usually involves early intervention programs, speech therapy, occupational therapy, physical therapy, and special education services. Regular follow-up with a team of specialists helps ensure that emerging medical or developmental concerns are addressed promptly. With appropriate support, many individuals can make meaningful developmental progress and improve their quality of life.
Also known as:
Key symptoms:
Developmental delayIntellectual disabilitySpeech and language delaysDistinctive facial featuresShort stature or growth problemsLow muscle tone (floppiness in infancy)Feeding difficulties in infancyBehavioral challengesFine motor skill difficultiesLearning difficultiesDelayed walking milestonesPossible seizuresPossible vision or eye problemsPossible hearing problems
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 12q15q21 microdeletion syndrome.
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Specialists
View all specialists →No specialists are currently listed for 12q15q21 microdeletion 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 12q15q21 microdeletion syndrome.
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 is the exact size and location of my child's deletion, and what does that mean for their specific symptoms?,Was this deletion inherited from a parent or did it happen for the first time in my child?,What early intervention services should we start right away?,Are there any specific medical complications we should screen for regularly?,How often should my child have developmental assessments?,Are there any clinical trials or research studies we could participate in?,What is the long-term outlook for my child's independence and quality of life?
Common questions about 12q15q21 microdeletion syndrome
What is 12q15q21 microdeletion syndrome?
12q15q21 microdeletion syndrome is a very rare genetic condition caused by a small missing piece (microdeletion) of chromosome 12, specifically in the region between bands q15 and q21. This means that a tiny segment of genetic material that normally provides instructions for the body's development is absent. Because several genes are lost in this deletion, the syndrome can affect multiple body systems. Children born with this condition typically show developmental delay, intellectual disability, and distinctive facial features. Growth problems, including short stature, may also be present. So
At what age does 12q15q21 microdeletion syndrome typically begin?
Typical onset of 12q15q21 microdeletion syndrome is neonatal. Age of onset can vary across affected individuals.