Overview
Mild phosphoribosylpyrophosphate (PRPP) synthetase superactivity is a rare inherited metabolic condition where the body makes too much of an enzyme called PRPP synthetase 1. This enzyme plays a key role in producing purines, which are building blocks for DNA and other important molecules. When this enzyme is overactive, the body produces too much uric acid, a waste product of purine metabolism. Unlike the severe form of this condition, the mild form typically does not cause neurological problems. The excess uric acid builds up in the blood and can lead to gout, which causes painful, swollen joints, especially in the big toe, feet, and ankles. Over time, high uric acid levels can also cause kidney stones and, if untreated, may lead to kidney damage. Symptoms usually appear in late adolescence or adulthood, most commonly in males. Treatment focuses on lowering uric acid levels in the body. Medications such as allopurinol are commonly used to reduce uric acid production. Patients are also encouraged to stay well hydrated and may need to follow dietary guidelines to limit purine-rich foods. With proper management, many patients can control their symptoms effectively and prevent serious complications like kidney failure. Early diagnosis and consistent treatment are important for long-term health.
Key symptoms:
Gout (painful, swollen joints)Kidney stonesHigh uric acid levels in the bloodJoint pain, especially in the big toeRedness and warmth in affected jointsUric acid crystals in jointsKidney damage over timeTophi (lumps of uric acid crystals under the skin)Orange or reddish urine sedimentBack or flank pain from kidney stones
Clinical phenotype terms (15)— hover any for plain English
X-linked recessive
Carried on the X chromosome; typically affects males more than females
Adult
Begins in adulthood (age 18 or older)
Treatments
No FDA-approved treatments are currently listed for Mild phosphoribosylpyrophosphate synthetase superactivity.
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Specialists
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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 Mild phosphoribosylpyrophosphate synthetase superactivity.
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Caregiver Resources
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Questions for your doctor
Bring these to your next appointment
- Q1.What is my current uric acid level, and what is the target we are aiming for?,How is my kidney function, and how often should it be checked?,What should I do if I have a sudden gout attack at home?,Are there specific foods or drinks I should avoid?,Should my family members be tested for this condition?,What are the long-term risks if my uric acid is not well controlled?,Are there any new treatments or clinical trials I should know about?
Common questions about Mild phosphoribosylpyrophosphate synthetase superactivity
What is Mild phosphoribosylpyrophosphate synthetase superactivity?
Mild phosphoribosylpyrophosphate (PRPP) synthetase superactivity is a rare inherited metabolic condition where the body makes too much of an enzyme called PRPP synthetase 1. This enzyme plays a key role in producing purines, which are building blocks for DNA and other important molecules. When this enzyme is overactive, the body produces too much uric acid, a waste product of purine metabolism. Unlike the severe form of this condition, the mild form typically does not cause neurological problems. The excess uric acid builds up in the blood and can lead to gout, which causes painful, swollen j
How is Mild phosphoribosylpyrophosphate synthetase superactivity inherited?
Mild phosphoribosylpyrophosphate synthetase superactivity follows a x-linked recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Mild phosphoribosylpyrophosphate synthetase superactivity typically begin?
Typical onset of Mild phosphoribosylpyrophosphate synthetase superactivity is adult. Age of onset can vary across affected individuals.