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Detection of deletions in de novo “balanced” chromosome rearrangements: Further evidence for their role in phenotypic abnormalities
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Detection of deletions in de novo “balanced” chromosome rearrangements: Further evidence for their role in phenotypic abnormalities
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Detection of deletions in de novo “balanced” chromosome rearrangements: Further evidence for their role in phenotypic abnormalities
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Journal Article
Detection of deletions in de novo “balanced” chromosome rearrangements: Further evidence for their role in phenotypic abnormalities
2004
Overview
Purpose: The purpose of this study was to test the hypothesis that deletions of varying sizes in de novo apparently balanced chromosome rearrangements are a significant cause of phenotypic abnormalities.
Methods: A total of fifteen patients, with seemingly balanced de novo rearrangements by routine cytogenetic analysis but with phenotypic anomalies, were systematically analyzed. We characterized the breakpoints in these fifteen cases (two of which were ascertained prenatally), using a combination of high-resolution GTG-banding, fluorescence in situ hybridization (FISH) with bacterial artificial chromosomes (BACs), and data from the Human Genome Project.
Results: Molecular cytogenetic characterization of the 15 patients revealed nine with deletions, ranging in size from 0.8 to 15.3 Mb, with the number of genes lost ranging from 15 to 70. In five of the other six cases, a known or putative gene(s) was potentially disrupted as a result of the chromosomal rearrangement. In the remaining case, no deletions were detected, and no known genes were apparently disrupted.
Conclusions: Our study suggests that the use of molecular cytogenetic techniques is a highly effective way of systematically delineating chromosomal breakpoints, and that the presence of deletions of varying size is an important cause of phenotypic abnormalities in patients with “balanced” de novo rearrangements.
Publisher
Elsevier Inc
