Dissecting the Roles of Divergent and Convergent Transcription in Chromosome Instability

Cell Reports
Nicholas R Pannunzio, Michael R Lieber

Abstract

The interplay of transcription, topological tension, and chromosome breakage is a subject of intense interest, but, with so many facets to the problem, it is difficult to test. Here, we vary the orientation of promoters relative to one another in a yeast system that permits sensitive detection of chromosome breaks. Interestingly, convergent transcription that would direct RNA polymerases into one another does not increase chromosome breakage. In contrast, divergent transcription that would create underwound and potentially single-stranded DNA does cause a marked increase in chromosome breakage. Furthermore, we examine the role that topoisomerases are playing in preventing genome instability at these promoters and find that Top2 is required to prevent instability at converging promoters.

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Citations

May 26, 2016·Nature Reviews. Cancer·Michael R Lieber
Jul 21, 2016·Nature Reviews. Molecular Cell Biology·Tatiana García-Muse, Andrés Aguilera
May 28, 2019·Genes & Development·Belén Gómez-González, Andrés Aguilera
Mar 22, 2020·Nucleic Acids Research·Francesca GoriniStefano Amente
Nov 20, 2020·Nature Reviews. Molecular Cell Biology·Melvin Noe GonzalezJesper Q Svejstrup

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