Journal
PRENATAL DIAGNOSIS
Volume 21, Issue 12, Pages 1049-1052Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/pd.192
Keywords
multicolour banding; microdissection; chromosome 18; insertion
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Objectives Different aberrations in one chromosome 18 were prenatally detected during each of three different pregnancies of a healthy woman. Routine cytogenetic analysis revealed a morphologically altered maternal chromosome 18 as well. The purpose of the current study was to characterize these cytogenetic changes in detail and thus to clarify the reason for the recurrent appearance of morphologically altered chromosomes 18 in this family. Methods As GTG banding did not allow resolution of the kind. of aberrations present in these four cases, the following molecular cytogenetic approaches were used: microdissection combined with reverse painting and multicolour banding (MCB) analysis using a chromosome 18 specific probe set. Results Molecular cytogenetic approaches revealed that fetus I had a derivative chromosome del(18) (q1 1.2q12.2), fetus 2 and the mother had the identical derivative chromosomes del(18) q12.2q11.2::p11.32q11.2::ql2.3qter) and fetus 3 had a dup(11.2ql2.2). Conclusion Partial monosomy in fetus 1 and partial trisomy in fetus 3 can be explained by crossing over events during maternal meiosis. Copyright (C) 2001 John Wiley & Sons, Ltd.
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