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Prenatal diagnosis of an extranumerary i(22p) with normal phenotype
L Doneda1, L Dalprà, M G Tibiletti
1Dept of Biology and Genetics, Medical Faculty, University of Milan, Italy.
Annales De Genetique
|January 1, 1993
Abstract:
A DA-Dapi and AgNOR-negative extranumerary chromosome was identified prenatally in a male fetus and also found in his normal father. Fluorescence in situ hybridization using repetitive DNA probes showed that the minute marker was positive at both ends for beta-satellite sequences, while its centromere was recognized by a 22 alphoid probe. It is concluded that the non-mosaic familial marker represents a 22p isochromosome.