Familial adrenoleukodystrophy: long chain fatty acid levels and analysis with a factor VIII DNA probe.

Segregation studies of X-linked adrenoleukodystrophy (ALD) and a cloned desoxyribonucleic fragment (factor VIII gene), which detects polymorphism in the distal end of the long arm of the X chromosome (Xq28), are reported in a large sibship ALD family. The findings should permit better identification of carriers and add a new marker for identifying the ALD gene itself.