Abstract: The present invention provides a powerful technique based on ultra high-throughput sequencing that finds structural aberrations of chromosomes and defines breakpoints. It is disclosed herein that, Anchored ChromPET, a technique to capture and interrogate targeted sequences in the genome, is a cost-effective means to identify chromosomal aberrations and define breakpoints. Using this method, we defined the BCR-ABL1 translocation DNA breakpoint to a base-pair resolution in Philadelphia chromosome positive cell lines and patient cells. This DNA-based method is highly sensitive and can detect signal using samples from which it is hard to obtain RNA or cells where the RNA expression has been silenced. These data demonstrate that ChromPET is a cost-effective and powerful technology that can identify and follow the appearance of chromosomal aberrations in various organisms, including, but not limited to, humans.