Caspase-Activated DNase Localizes to Cancer Causing Translocation Breakpoints During Cell Differentiation
Alsowaida, D.; Larsen, B. D.; Hachmer, S.; Azimi, M.; Arezza, E.; Brunette, S.; Tur, S.; Palii, C. G.; Albraidy, B.; Sorensen, C. S.; Brand, M.; Dilworth, F. J.; Megeney, L. A.
Show abstract
Caspase activated DNase (CAD) induced DNA breaks promote cell differentiation and therapy-induced cancer cell resistance. CAD targeting activity is assumed to be unique to each condition, as differentiation and cancer genesis are divergent cell fates. Here, we made the surprising discovery that a subset of CAD-bound targets in differentiating muscle cells are the same genes involved in the genesis of cancer-causing translocations. In muscle cells, a prominent CAD-bound gene pair is Pax7 and Foxo1a, the mismatched reciprocal loci that give rise to alveolar rhabdomyosarcoma. We show that CAD-targeted breaks in the Pax7 gene are physiologic to reduce Pax7 expression, a prerequisite for muscle cell differentiation. A cohort of these CAD gene targets are also conserved in early differentiating T cells and include genes that spur leukemia/lymphoma translocations. Our results suggest the CAD targeting of translocation prone oncogenic genes is non-pathologic biology and aligns with initiation of cell fate transitions.
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