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Lesch-Nyhan Syndrome: report on two brothers
Zhonghua Minguo Xiao Er Ke Yi Xue Hui Za Zhi [Journal]. Zhonghua Minguo Xiao Er Ke Yi Xue Hui
|November 1, 1994
Summary
Lesch-Nyhan syndrome, a rare X-linked disorder, results from hypoxanthine-guanine phosphoribosyl transferase (HPRT) deficiency. This case study highlights its diagnosis in two siblings, emphasizing HPRT activity testing for accurate identification.
Area of Science:
- Genetics
- Metabolic Disorders
- Pediatrics
Background:
- Lesch-Nyhan syndrome is a rare X-linked genetic disorder.
- It is characterized by hyperuricemia and central nervous system dysfunction.
- The underlying cause is a deficiency in the enzyme hypoxanthine-guanine phosphoribosyl transferase (HPRT).
Observation:
- A 12-month-old male presented with developmental delay, mental retardation, and athetosis.
- Orange crystals in diapers and hyperuricemia were noted.
- His younger brother also presented with similar symptoms and diagnosed with Lesch-Nyhan syndrome.
Findings:
- The patient exhibited very low HPRT activity in erythrocyte lysates (<0.05% of control).
- The younger sibling also showed significantly reduced HPRT activity.
- Hyperuricemia and uric acid crystals were confirmed in both affected siblings.
Implications:
- HPRT activity assays are crucial for diagnosing Lesch-Nyhan syndrome.
- Genetic counseling and DNA analysis can aid in carrier detection and family planning.
- Underdiagnosis may contribute to the perceived rarity of this syndrome in certain populations, such as the Chinese.