Ornithine translocase deficiency

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Ornithine translocase deficiency
Other names	HHH syndrome, ORNT1 deficiency, ornithine carrier deficiency, triple H syndrome
Ornithine

Ornithine translocase deficiency, also called hyperornithinemia-hyperammonemia-homocitrullinuria (HHH) syndrome,^[1] is a rare autosomal recessive^[2] urea cycle disorder affecting the enzyme ornithine translocase, which causes ammonia to accumulate in the blood, a condition called hyperammonemia.

Ammonia, which is formed when proteins are broken down in the body, is toxic if the levels become too high. The nervous system is especially sensitive to the effects of excess ammonia.