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A Pelham, MA O'Reilly, S Malcolm, RJ Levinsky and C Kinnon
Department of Immunology, Institute of Child Health, London, England.
The molecular basis of X-linked chronic granulomatous disease (X-CGD) has
recently been elucidated and the defective gene identified and isolated.
Two restriction fragment-length polymorphisms have been identified using
the X-CGD cDNA probe. We have analyzed eight families with X-CGD and seven
normal, unrelated females and have demonstrated that these polymorphisms
are not in linkage disequilibrium. This should increase to approximately
50% the proportion of families to whom first- trimester prenatal diagnosis
can be offered. Unambiguous determination of carrier status in related
females in informative families will also be possible. In addition, we have
identified an apparently unique small deletion in the X-CGD gene in a
family affected by this disease, members of which are not informative for
either polymorphism. This will allow prenatal diagnosis and carrier
determination in this family.
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