Arginase Deficiency Presenting as Acute Encephalopathy.

Area of Science:

• Biochemistry
• Genetics
• Pediatric Neurology

Background:

• Urea cycle disorders (UCDs) are rare genetic conditions impacting nitrogen metabolism.
• Arginase deficiency (ARG1 deficiency) is an autosomal recessive UCD characterized by hyperargininemia.
• Typical clinical manifestations of ARG1 deficiency include spastic diplegia and developmental delay.

Observation:

• This report details a pediatric case with a rare clinical presentation.
• The patient exhibited acute encephalopathy, a symptom not commonly associated with ARG1 deficiency.

Findings:

• The study identifies a rare case of arginase deficiency.
• The patient presented with hyperammonemia and acute encephalopathy, diverging from the typical spastic diplegia presentation.
• This underscores the variability in clinical manifestations of urea cycle disorders.

Implications:

• Highlights the importance of considering diverse clinical presentations in diagnosing metabolic disorders.
• Suggests that hyperammonemic encephalopathy can occur in arginase deficiency, challenging typical diagnostic assumptions.
• Emphasizes the need for timely diagnosis and management of UCDs to prevent severe neurological sequelae.