Abstract
A study of karyotypes and neutrophil alkaline phosphatase (NAP) was carried out for 66 parents (33 couples) of trisomy 21 children and for 60 control parents (30 couples). Enzyme activity was determined simultaneously by biochemical and cytochemical techniques. In the mothers of trisomy 21 children we found: (a) by biochemical techniques, a significant increase of NAP activity in polymorphonuclear leukocyte (PMN) homogenates (P less than 0.01) and a lower supernatant/pellet ratio (P less than 0.01); (b) by cytochemical techniques (with or without thermal and urea treatments) NAP activity was significantly higher (P less than 0.001) than in control mothers; in the fathers, the two techniques gave normal NAP activity results.
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