Renal-retinal ciliopathy gene Sdccag8 regulates DNA damage response signaling

Rannar Airik, Gisela G. Slaats, Zhi Guo, Anna Carina Weiss, Naheed Khan, Amiya Ghosh, Toby W. Hurd, Simon Bekker-Jensen, Jacob M. Schrøder, Steve J. Elledge, Jens S. Andersen, Andreas Kispert, Maddalena Castelli, Alessandra Boletta, Rachel H. Giles, Friedhelm Hildebrandt

Research output: Contribution to journalArticle

Abstract

Nephronophthisis-related ciliopathies (NPHP-RCs) are developmental and degenerative kidney diseases that are frequently associated with extrarenal pathologies such as retinal degeneration, obesity, and intellectual disability. We recently identified mutations in a gene encoding the centrosomal protein SDCCAG8 as causing NPHP type 10 in humans. To study the role of Sdccag8 in disease pathogenesis, we generated a Sdccag8 gene-trap mouse line. Homozygous Sdccag8gt/gt mice lacked the wild-type Sdccag8 transcript and protein, and recapitulated the human phenotypes of NPHP and retinal degeneration. These mice exhibited early onset retinal degeneration that was associated with rhodopsin mislocalization in the photoreceptors and reduced cone cell numbers, and led to progressive loss of vision. By contrast, renal histologic changes occurred later, and no global ciliary defects were observed in the kidneys. Instead, renal pathology was associated with elevated levels of DNA damage response signaling activity. Cell culture studies confirmed the aberrant activation of DNA damage response in Sdccag8gt/gt-derived cells, characterized by elevated levels of γH2AX and phosphorylated ATM and cell cycle profile abnormalities. Our analysis of Sdccag8gt/gt mice indicates that the pleiotropic phenotypes in these mice may arise through multiple tissue-specific disease mechanisms.

Original languageEnglish
Pages (from-to)2573-2583
Number of pages11
JournalJournal of the American Society of Nephrology
Volume25
Issue number11
DOIs
Publication statusPublished - Nov 1 2014

ASJC Scopus subject areas

  • Nephrology

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    Airik, R., Slaats, G. G., Guo, Z., Weiss, A. C., Khan, N., Ghosh, A., Hurd, T. W., Bekker-Jensen, S., Schrøder, J. M., Elledge, S. J., Andersen, J. S., Kispert, A., Castelli, M., Boletta, A., Giles, R. H., & Hildebrandt, F. (2014). Renal-retinal ciliopathy gene Sdccag8 regulates DNA damage response signaling. Journal of the American Society of Nephrology, 25(11), 2573-2583. https://doi.org/10.1681/ASN.2013050565