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A molecular cytogenetic study of 251 cases with balanced chromosomal rearrangements detected due to infertility of unclear origin or in prenatal diagnostics with a later normal outcome was done. Balanced translocations (127 cases), inversions (105 cases), insertions (three cases), balanced complex rearrangements (four cases), or derivative chromosomes leading to no imbalance (12 cases), were studied by multicolor banding (MCB) and/or subcentromeric multicolor fluorescence in situ hybridization (subcenM-FISH). Five-hundred and twenty-nine break-events were characterized by molecular cytogenetics. Only 150 of these were unique breakpoints, the remainder were observed between two and 10 times. According to the results obtained, there was cytogenetic co-localization of fragile site (FS) in ~71% of the studied 529 break-events. Nine selected cases with evidence for breakpoints within FS were further analyzed by FS-specific bacterial artificial chromosome (BAC) probes; only one did not show a co-localization. Further detailed molecular analysis will be necessary to characterize the mechanisms and genetic basis for this phenomenon.

Evidence for Correlation of Fragile Sites and Chromosomal Breakpoints in Carriers of Constitutional Balanced Chromosomal Rearrangements