RRC ID 28871
Author Barclay SS, Tamura T, Ito H, Fujita K, Tagawa K, Shimamura T, Katsuta A, Shiwaku H, Sone M, Imoto S, Miyano S, Okazawa H.
Title Systems biology analysis of Drosophila in vivo screen data elucidates core networks for DNA damage repair in SCA1.
Journal Hum Mol Genet
Abstract DNA damage repair is implicated in neurodegenerative diseases; however, the relative contributions of various DNA repair systems to the pathology of these diseases have not been investigated systematically. In this study, we performed a systematic in vivo screen of all available Drosophila melanogaster homolog DNA repair genes, and we tested the effect of their overexpression on lifespan and developmental viability in Spinocerebellar Ataxia Type 1 (SCA1) Drosophila models expressing human mutant Ataxin-1 (Atxn1). We identified genes previously unknown to be involved in CAG-/polyQ-related pathogenesis that function in multiple DNA damage repair systems. Beyond the significance of each repair system, systems biology analyses unraveled the core networks connecting positive genes in the gene screen that could contribute to SCA1 pathology. In particular, RpA1, which had the largest effect on lifespan in the SCA1 fly model, was located at the hub position linked to such core repair systems, including homologous recombination (HR). We revealed that Atxn1 actually interacted with RpA1 and its essential partners BRCA1/2. Furthermore, mutant but not normal Atxn1 impaired the dynamics of RpA1 in the nucleus after DNA damage. Uptake of BrdU by Purkinje cells was observed in mutant Atxn1 knockin mice, suggesting their abnormal entry to the S-phase. In addition, chemical and genetic inhibitions of Chk1 elongated lifespan and recovered eye degeneration. Collectively, we elucidated core networks for DNA damage repair in SCA1 that might include the aberrant usage of HR.
Volume 23(5)
Pages 1345-64
Published 2014-3-1
DOI 10.1093/hmg/ddt524
PII ddt524
PMID 24179173
MeSH Animals Animals, Genetically Modified Ataxin-1 Ataxins Cell Cycle / genetics Checkpoint Kinase 1 DNA Damage* DNA Repair* Disease Models, Animal Drosophila / genetics* Female Gene Regulatory Networks* Genetic Vectors / genetics Humans Longevity / genetics Male Mutagenesis, Insertional Mutation Nerve Tissue Proteins / genetics Nuclear Proteins / genetics Protein Kinases / metabolism Purkinje Cells / metabolism Signal Transduction Spinocerebellar Ataxias / genetics* Spinocerebellar Ataxias / metabolism Spinocerebellar Ataxias / mortality Systems Biology
IF 5.101
Times Cited 13
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