Recurrent coma and Lesch-Nyhan syndrome.

Area of Science:

• Biochemistry
• Genetics
• Neurology

Background:

• Lesch-Nyhan syndrome is a rare genetic disorder caused by a deficiency in the hypoxanthine-guanine-phosphoribosyl-transferase (HPRT1) enzyme.
• This deficiency impairs the purine salvage pathway, leading to abnormal purine metabolism.
• The syndrome is primarily known for neurological and behavioral symptoms, including self-injurious behavior and gouty arthritis.

Observation:

• A patient with Lesch-Nyhan syndrome experienced three distinct episodes of coma.
• Each coma episode was preceded by an acute illness.
• Standard investigations for common causes of coma did not identify a specific diagnosis.

Findings:

• Coma is not a commonly recognized clinical feature of Lesch-Nyhan syndrome.
• The recurrent coma episodes in this patient, and potentially similar reported cases, suggest an underappreciated aspect of the syndrome.
• The underlying mechanism may involve disruption of cellular energy metabolism due to purine depletion.

Implications:

• The findings suggest that purine depletion, a consequence of HPRT1 deficiency, could lead to severe metabolic disturbances like coma.
• This expands the understanding of Lesch-Nyhan syndrome's clinical spectrum beyond its typical neurological and behavioral manifestations.
• Further research is warranted to explore the link between purine metabolism, energy deficits, and episodic neurological events in Lesch-Nyhan syndrome.