Partial HPRT deficiency (Kelley-Seegmiller syndrome)

Area of Science:

• Biochemistry
• Genetics
• Metabolic Disorders

Background:

• Hypoxanthine-guanine phosphoribosyl transferase (HPRT) deficiency is an X-linked genetic disorder affecting purine metabolism.
• Enzyme deficiency levels dictate clinical presentation, ranging from severe neurological and renal issues in complete deficiency (Lesch-Nyhan Syndrome) to gout and kidney stones in partial deficiency (Kelley-Seegmiller syndrome).

Observation:

• A rare case of partial HPRT deficiency is presented.
• The patient exhibited chronic tophaceous gout, mental retardation, and nephrolithiasis.
• A family history suggestive of X-linked inheritance was noted.

Findings:

• The case illustrates a rare presentation of partial HPRT deficiency.
• Clinical manifestations included severe hyperuricemia leading to tophaceous gout and renal complications.
• Associated neurological deficits (mental retardation) were observed, expanding the known phenotype spectrum.

Implications:

• This case underscores the importance of considering HPRT deficiency in patients with unexplained gout, nephrolithiasis, and neurological symptoms.
• Early diagnosis and management of HPRT deficiency can prevent severe complications.
• Further research into the genotype-phenotype correlations of HPRT deficiency is warranted.