Jumping translocations (JTs) are very rare chromosome aberrations, usually identified in tumors. We report a constitutional JT between donor chromosome 21q21.3→qter and recipients 13qter and 18qter, resulting in an ∼15.5-Mb proximal deletion 21q in a girl with mild developmental delay and minor dysmorphic features. Using fluorescence in situ hybridization (FISH) studies, we identified an ∼550-kb complex inter- and intra-chromosomal low-copy repeat (LCR) adjacent to the 21q21.3 translocation breakpoint. On the recipient chromosomes 13qter and 18qter, the telomeric sequences TTAGGG were retained. Genotyping revealed that the deletion was of maternal origin. We propose that genome architecture involving LCRs may be a major mechanism responsible for the origin of jumping translocations.   

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