Journal article

Loss of TOP3B leads to increased R-loop formation and genome instability

Tao Zhang, Mathew Wallis, Vida Petrovic, Jackie Challis, Paul Kalitsis, Damien F Hudson

Open Biology | ROYAL SOC | Published : 2019


Topoisomerase III beta (TOP3B) is one of the least understood members of the topoisomerase family of proteins and remains enigmatic. Our recent data shed light on the function and relevance of TOP3B to disease. A homozygous deletion for the TOP3B gene was identified in a patient with bilateral renal cancer. Analyses in both patient and modelled human cells show the disruption of TOP3B causes genome instability with a rise in DNA damage and chromosome bridging (mis-segregation). The primary molecular defect underlying this pathology is a significant increase in R-loop formation. Our data show that TOP3B is necessary to prevent the accumulation of excessive R-loops and identify TOP3B as a puta..

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Awarded by National Health and Medical Research Council (Australia)

Funding Acknowledgements

Funding was provided by the National Health and Medical Research Council (Australia) project grants nos. GNT1127209 (P.K. and D.F.H.) and GNT1145188 (P.K. and D.F.H.) and by the Victorian Government's Operational Infrastructure Support Program.