Oral-Facial-Digital syndrome Type I cells exhibit impaired DNA repair; unanticipated consequences of defective OFD1 outside of the cilia network

Abramowicz, Iga, Carpenter, Gillian, Alfieri, Mariaevelina, Colnaghi, Rita, Outwin, Emily, Parent, Philippe, Thauvin-Robinet, Christel, Iaconis, Daniela, Franco, Brunella and O'Driscoll, Mark (2017) Oral-Facial-Digital syndrome Type I cells exhibit impaired DNA repair; unanticipated consequences of defective OFD1 outside of the cilia network. Human Molecular Genetics, 26 (1). pp. 19-32. ISSN 0964-6906

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Abstract

Defects in OFD1 underlie the clinically complex ciliopathy, Oral-Facial-Digital syndrome Type I (OFD Type I). Our understanding of the molecular, cellular and clinical consequences of impaired OFD1 originate from its characterised roles at the centrosome/basal body/cilia network. Nonetheless, the first described OFD1 interactors were components of the TIP60 histone acetyltransferase complex. We find that OFD1 can also localise to chromatin and its reduced expression is associated with mislocalization of TIP60 in patient-derived cell lines. TIP60 plays important roles in controlling DNA repair. OFD Type I cells exhibit reduced histone acetylation and altered chromatin dynamics in response to DNA double strand breaks (DSBs). Furthermore, reduced OFD1 impaired DSB repair via homologous recombination repair (HRR). OFD1 loss also adversely impacted upon the DSB-induced G2-M checkpoint, inducing a hypersensitive and prolonged arrest. Our findings show that OFD Type I patient cells have pronounced defects in the DSB-induced histone modification, chromatin remodelling and DSB-repair via HRR; effectively phenocopying loss of TIP60. These data extend our knowledge of the molecular and cellular consequences of impaired OFD1, demonstrating that loss of OFD1 can negatively impact upon important nuclear events; chromatin plasticity and DNA repair.

Item Type: Article
Schools and Departments: School of Life Sciences > Sussex Centre for Genome Damage and Stability
Research Centres and Groups: Genome Damage and Stability Centre
Subjects: Q Science > QM Human anatomy > QM0531 Regional anatomy
R Medicine > RB Pathology > RB151 Theories of disease. Etiology. Pathogenesis > RB155.5 Genetic disorders. Human chromosome abnormalities
Depositing User: Mark O'Driscoll
Date Deposited: 19 Dec 2016 17:00
Last Modified: 15 Jun 2017 13:20
URI: http://sro.sussex.ac.uk/id/eprint/65957

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