Abstract
Several experimental in vivo systems exist that generate reciprocal translocations between engineered chromosomal loci of yeast or Drosophila, but not without previous genome modifications. Here we report the successful induction of chromosome translocations in unmodified yeast cells via targeted DNA integration of the KANR selectable marker flanked by sequences homologous to two chromosomal loci randomly chosen on the genome. Using this bridge-induced translocation system, 2% of the integrants showed targeted translocations between chromosomes V-VIII and VIII-XV in two wild-type Saccharomyces cerevisiae strains. All the translocation events studied were found to be non-reciprocal and the fate of their chromosomal fragments that were not included in the translocated chromosome was followed. The recovery of discrete-sized fragments suggested multiple pathway repair of their free DNA ends. We propose that centromere-distal chromosome fragments may be processed by a break-induced replication mechanism ensuing in partial trisomy. The experimental feasibility of inducing chromosomal translocations between any two desired genetic loci in a eukaryotic model system will be instrumental in elucidating the molecular mechanism underlying genome rearrangements generated by DNA integration and the gross chromosomal rearrangements characteristic of many types of cancer.
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S.K.W. was a Ph.D. student supported by a fellowship from the International Centre for Genetic Engineering and Biotechnology.
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Tosato, V., Waghmare, S.K. & Bruschi, C.V. Non-reciprocal chromosomal bridge-induced translocation (BIT) by targeted DNA integration in yeast. Chromosoma 114, 15–27 (2005). https://doi.org/10.1007/s00412-005-0332-x
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DOI: https://doi.org/10.1007/s00412-005-0332-x