Some structural features of T. cruzi chromatin could providethe foundation for chromosomal rearrangements. Thus, Trypanosoma chromatin shows a greater sensitivity to micrococcal nuclease and a lower compactness, when compared to mammalian chromatin [5]. Besides, proliferative epimastigote forms exhibit limited chromatin compaction with respect to the nonproliferative epimastigotes and trypomastigotes (Go cells) [6,7]. Finally, Trypanosoma chromosomes are subjected both to dynamic spatial reorganization during DNA replication [8] and to traction forces by a mitotic spindle during chromosomal segregation [9]. Together, these findings suggest that DNA breaks and chromosomal rearrangements could occur during proliferative expansion in T. cruzi, particularly during DNA replication and mitosis.