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Title: Investigating the role of Drosha and RNA molecules in the repair of DNA double-strand breaks
Author: Hawley, Benjamin Richard
ISNI:       0000 0004 6495 003X
Awarding Body: University of Leicester
Current Institution: University of Leicester
Date of Award: 2018
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The error‐free and efficient repair of DNA double‐strand breaks is extremely important for cell survival. Over the past several years, RNA has been increasingly implicated in the DNA damage response, but the mechanism or mechanisms through which it can act remain poorly understood. Various hypotheses have been made in the literature: RNA as a signalling molecule or as a scaffold; RNA long‐range interactions to reorganise or maintain chromatin structure; RNA as a template for repair. In this thesis, the miRNA biogenesis apparatus was demonstrated to be involved in DNA repair outside of their normal roles in miRNA maturation. Drosha was required for efficient repair by the two major repair pathways, suggesting a central role in the DNA damage response. Previous reports looking at the involvement of Drosha in DNA damage had suggested that Drosha processes newly transcribed RNA, the product of which would carry out a role in repair. Here, a comprehensive series of nextgeneration sequencing approaches was unable to validate this. Later experiments instead discovered that pre‐existing RNA molecules could participate in repair. RNA invasion around DNA break sites was observed, and shown to be Drosha‐dependent. These damage‐induced DNA:RNA hybrid structures were important for efficient repair, showing that RNA can be a direct and critical mediator of DNA damage repair.
Supervisor: Bushell, Martin Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available