Senataxin plays an essential role with DNA damage response proteins in meiotic recombination and gene silencing

Becherel, Olivier J., Yeo, Abrey J., Stellati, Alissa, Heng, Evelyn Y. H., Luff, John, Suraweera, Amila, Woods, Rick, Fleming, Jean, Carrie, Dianne, McKinney, Kristine, Xu, Xiaoling, Deng, Chuxia, & Lavin, Martin F. (2013) Senataxin plays an essential role with DNA damage response proteins in meiotic recombination and gene silencing. PLOS Genetics, 9(4), e1003435.

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Abstract

Senataxin, mutated in the human genetic disorder ataxia with oculomotor apraxia type 2 (AOA2), plays an important role in maintaining genome integrity by coordination of transcription, DNA replication, and the DNA damage response. We demonstrate that senataxin is essential for spermatogenesis and that it functions at two stages in meiosis during crossing-over in homologous recombination and in meiotic sex chromosome inactivation (MSCI). Disruption of the Setx gene caused persistence of DNA double-strand breaks, a defect in disassembly of Rad51 filaments, accumulation of DNA:RNA hybrids (R-loops), and ultimately a failure of crossing-over. Senataxin localised to the XY body in a Brca1-dependent manner, and in its absence there was incomplete localisation of DNA damage response proteins to the XY chromosomes and ATR was retained on the axial elements of these chromosomes, failing to diffuse out into chromatin. Furthermore persistence of RNA polymerase II activity, altered ubH2A distribution, and abnormal XY-linked gene expression in Setx⁻/⁻ revealed an essential role for senataxin in MSCI. These data support key roles for senataxin in coordinating meiotic crossing-over with transcription and in gene silencing to protect the integrity of the genome.

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ID Code: 74404
Item Type: Journal Article
Refereed: Yes
DOI: 10.1371/journal.pgen.1003435
ISSN: 1553-7404
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100)
Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > GENETICS (060400)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > MEDICAL BIOCHEMISTRY AND METABOLOMICS (110100) > Medical Biochemistry - Proteins and Peptides (incl. Medical Proteomics) (110106)
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Copyright Statement: This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for
any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.
Deposited On: 24 Jul 2014 22:15
Last Modified: 28 Jul 2014 20:03

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