metabolic disease...manifesting heterozygotes. Examples of X-linked disorders include ornithine transcarbamylase deficiency (an enzyme deficiency resulting in high blood levels of ammonia and impaired urea formation), X-linked adrenoleukodystrophy (a disorder that is characterized by progressive mental and physical deterioration and adrenal insufficiency), and Lesch-Nyhan syndrome (a disorder of purine metabolism...In other disorders peroxisomes appear normal, with decreased activity of only a single enzyme. One example is X-linked adrenoleukodystrophy (X-ALD), an insidious disorder in which affected individuals show normal early development. Between the ages of 4 and 8, behaviour problems including hyperactivity, aggressiveness, or poor school performance appear in affected boys. Children often lose...
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