Overview
PDE4D haploinsufficiency syndrome is a rare genetic condition caused by having only one working copy of the PDE4D gene instead of the usual two. This gene provides instructions for making an enzyme called phosphodiesterase 4D, which plays an important role in chemical signaling within cells, particularly in the brain and bones. When one copy of this gene is missing or not working properly, it can lead to a range of developmental and physical problems. The main features of this syndrome include intellectual disability or learning difficulties, delayed speech and language development, and distinctive facial features. Many affected individuals also have skeletal abnormalities, particularly involving the fingers and toes (brachydactyly), as well as short stature. Some children may experience behavioral challenges, including attention difficulties and features of autism spectrum disorder. The severity of symptoms can vary widely from person to person, even within the same family. There is currently no cure for PDE4D haploinsufficiency syndrome. Treatment focuses on managing individual symptoms through therapies such as speech therapy, occupational therapy, special education support, and behavioral interventions. Regular monitoring by a team of specialists helps ensure that each person receives the care they need to reach their full potential.
Key symptoms:
Intellectual disability or learning difficultiesDelayed speech and language developmentShort statureShort fingers and toes (brachydactyly)Distinctive facial featuresLow muscle tone in infancyDelayed motor milestones such as walkingBehavioral challenges including attention problemsFeatures of autism spectrum disorder in some individualsBroad or flat nasal bridgeSmall head size (microcephaly) in some casesFeeding difficulties in early childhoodSkeletal abnormalities
Clinical phenotype terms (50)— hover any for plain English
Autosomal dominant
Passed on from just one parent; each child has about a 50% chance of inheriting it
Childhood
Begins in childhood, roughly ages 1 to 12
Treatments
No FDA-approved treatments are currently listed for PDE4D haploinsufficiency syndrome.
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Specialists
View all specialists →No specialists are currently listed for PDE4D haploinsufficiency 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 PDE4D haploinsufficiency 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.How severe is my child's condition based on the genetic findings?,What therapies should we start right away, and how often should they occur?,Are there any other medical tests or screenings my child needs?,How should we monitor my child's growth and development over time?,What educational supports and accommodations should we request at school?,Is there a risk that future children could also have this condition?,Are there any research studies or clinical trials we should know about?
Common questions about PDE4D haploinsufficiency syndrome
What is PDE4D haploinsufficiency syndrome?
PDE4D haploinsufficiency syndrome is a rare genetic condition caused by having only one working copy of the PDE4D gene instead of the usual two. This gene provides instructions for making an enzyme called phosphodiesterase 4D, which plays an important role in chemical signaling within cells, particularly in the brain and bones. When one copy of this gene is missing or not working properly, it can lead to a range of developmental and physical problems. The main features of this syndrome include intellectual disability or learning difficulties, delayed speech and language development, and disti
How is PDE4D haploinsufficiency syndrome inherited?
PDE4D haploinsufficiency syndrome follows a autosomal dominant inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does PDE4D haploinsufficiency syndrome typically begin?
Typical onset of PDE4D haploinsufficiency syndrome is childhood. Age of onset can vary across affected individuals.