Essential developmental, genomic stability, and tumour suppressor functions of the mouse orthologue of hSSB1/NABP2

Wei Shi, Amanda L Bain, Bjoern Schwer, Fares Al-Ejeh, Corey Smith, Lee Wong, Hua Chai, Mariska S Miranda, Uda Ho, Makoto Kawaguchi, Yutaka Miura, John W Finnie, Meaghan Wall, Jorg Heierhorst, Carol Wicking, Kevin J Spring, Frederick Alt, Kum Kum Khanna

Research output: Contribution to journalArticleResearchpeer-review

25 Citations (Scopus)


Single-stranded DNA binding proteins (SSBs) regulate multiple DNA transactions, including replication, transcription, and repair. We recently identified SSB1 as a novel protein critical for the initiation of ATM signaling and DNA double-strand break repair by homologous recombination. Here we report that germline Ssb1(-/-) embryos die at birth from respiratory failure due to severe rib cage malformation and impaired alveolar development, coupled with additional skeletal defects. Unexpectedly, Ssb1(-/-) fibroblasts did not exhibit defects in Atm signaling or gamma-H2ax focus kinetics in response to ionizing radiation (IR), and B-cell specific deletion of Ssb1 did not affect class-switch recombination in vitro. However, conditional deletion of Ssb1 in adult mice led to increased cancer susceptibility with broad tumour spectrum, impaired male fertility with testicular degeneration, and increased radiosensitivity and IR-induced chromosome breaks in vivo. Collectively, these results demonstrate essential roles of Ssb1 in embryogenesis, spermatogenesis, and genome stability in vivo.
Original languageEnglish
Article numbere1003298
Number of pages19
JournalPLoS Genetics
Issue number2
Publication statusPublished - 2013

Cite this