1
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Odiba AS, Liao G, Ezechukwu CS, Zhang L, Hong Y, Fang W, Jin C, Gartner A, Wang B. Caenorhabditis elegans NSE3 homolog (MAGE-1) is involved in genome stability and acts in inter-sister recombination during meiosis. Genetics 2023; 225:iyad149. [PMID: 37579186 PMCID: PMC10691751 DOI: 10.1093/genetics/iyad149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 07/17/2023] [Accepted: 07/17/2023] [Indexed: 08/16/2023] Open
Abstract
Melanoma antigen (MAGE) genes encode for a family of proteins that share a common MAGE homology domain. These genes are conserved in eukaryotes and have been linked to a variety of cellular and developmental processes including ubiquitination and oncogenesis in cancer. Current knowledge on the MAGE family of proteins mainly comes from the analysis of yeast and human cell lines, and their functions have not been reported at an organismal level in animals. Caenorhabditis elegans only encodes 1 known MAGE gene member, mage-1 (NSE3 in yeast), forming part of the SMC-5/6 complex. Here, we characterize the role of mage-1/nse-3 in mitosis and meiosis in C. elegans. mage-1/nse-3 has a role in inter-sister recombination repair during meiotic recombination and for preserving chromosomal integrity upon treatment with a variety of DNA-damaging agents. MAGE-1 directly interacts with NSE-1 and NSE-4. In contrast to smc-5, smc-6, and nse-4 mutants which cause the loss of NSE-1 nuclear localization and strong cytoplasmic accumulation, mage-1/nse-3 mutants have a reduced level of NSE-1::GFP, remnant NSE-1::GFP being partially nuclear but largely cytoplasmic. Our data suggest that MAGE-1 is essential for NSE-1 stability and the proper functioning of the SMC-5/6 complex.
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Affiliation(s)
- Arome Solomon Odiba
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Guiyan Liao
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
| | - Chiemekam Samuel Ezechukwu
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
| | - Lanlan Zhang
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
- College of Life Sciences, Hebei University, Baoding 071002, China
| | - Ye Hong
- Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao 266237, China
| | - Wenxia Fang
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
| | - Cheng Jin
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Anton Gartner
- IBS Center for Genomic Integrity, Department for Biological Sciences, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
| | - Bin Wang
- State Key Laboratory of Non-food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China
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Wang Z, Lincoln S, Nguyen AD, Li W, Young MW. Chronic sleep loss disrupts rhythmic gene expression in Drosophila. Front Physiol 2022; 13:1048751. [PMID: 36467698 PMCID: PMC9716074 DOI: 10.3389/fphys.2022.1048751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Accepted: 11/01/2022] [Indexed: 11/19/2022] Open
Abstract
Genome-wide profiling of rhythmic gene expression has offered new avenues for studying the contribution of circadian clock to diverse biological processes. Sleep has been considered one of the most important physiological processes that are regulated by the circadian clock, however, the effects of chronic sleep loss on rhythmic gene expression remain poorly understood. In the present study, we exploited Drosophila sleep mutants insomniac 1 (inc 1 ) and wide awake D2 (wake D2 ) as models for chronic sleep loss. We profiled the transcriptomes of head tissues collected from 4-week-old wild type flies, inc 1 and wake D2 at timepoints around the clock. Analysis of gene oscillation revealed a substantial loss of rhythmicity in inc 1 and wake D2 compared to wild type flies, with most of the affected genes common to both mutants. The disruption of gene oscillation was not due to changes in average gene expression levels. We also identified a subset of genes whose loss of rhythmicity was shared among animals with chronic sleep loss and old flies, suggesting a contribution of aging to chronic, sleep-loss-induced disruption of gene oscillation.
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Affiliation(s)
- Zikun Wang
- Laboratory of Genetics, The Rockefeller University, New York, NY, United States
| | - Samantha Lincoln
- Laboratory of Genetics, The Rockefeller University, New York, NY, United States
| | - Andrew D. Nguyen
- Laboratory of Genetics, The Rockefeller University, New York, NY, United States
| | - Wanhe Li
- Laboratory of Genetics, The Rockefeller University, New York, NY, United States
- Department of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, United States
| | - Michael W. Young
- Laboratory of Genetics, The Rockefeller University, New York, NY, United States
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Scanlan JL, Battlay P, Robin C. Ecdysteroid kinase-like (EcKL) paralogs confer developmental tolerance to caffeine in Drosophila melanogaster. CURRENT RESEARCH IN INSECT SCIENCE 2022; 2:100030. [PMID: 36003262 PMCID: PMC9387500 DOI: 10.1016/j.cris.2022.100030] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 10/29/2022]
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Yoshikawa K. Necdin: A purposive integrator of molecular interaction networks for mammalian neuron vitality. Genes Cells 2021; 26:641-683. [PMID: 34338396 PMCID: PMC9290590 DOI: 10.1111/gtc.12884] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 06/27/2021] [Accepted: 06/29/2021] [Indexed: 12/29/2022]
Abstract
Necdin was originally found in 1991 as a hypothetical protein encoded by a neural differentiation‐specific gene transcript in murine embryonal carcinoma cells. Virtually all postmitotic neurons and their precursor cells express the necdin gene (Ndn) during neuronal development. Necdin mRNA is expressed only from the paternal allele through genomic imprinting, a placental mammal‐specific epigenetic mechanism. Necdin and its homologous MAGE (melanoma antigen) family, which have evolved presumedly from a subcomplex component of the SMC5/6 complex, are expressed exclusively in placental mammals. Paternal Ndn‐mutated mice totally lack necdin expression and exhibit various types of neuronal abnormalities throughout the nervous system. Ndn‐null neurons are vulnerable to detrimental stresses such as DNA damage. Necdin also suppresses both proliferation and apoptosis of neural stem/progenitor cells. Functional analyses using Ndn‐manipulated cells reveal that necdin consistently exerts antimitotic, anti‐apoptotic and prosurvival effects. Necdin interacts directly with a number of regulatory proteins including E2F1, p53, neurotrophin receptors, Sirt1 and PGC‐1α, which serve as major hubs of protein–protein interaction networks for mitosis, apoptosis, differentiation, neuroprotection and energy homeostasis. This review focuses on necdin as a pleiotropic protein that integrates molecular interaction networks to promote neuronal vitality in modern placental mammals.
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Li G, Zou W, Jian L, Qian J, Zhao J. AtNSE1 and AtNSE3 are required for embryo pattern formation and maintenance of cell viability during Arabidopsis embryogenesis. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:6229-6244. [PMID: 31408172 PMCID: PMC6859727 DOI: 10.1093/jxb/erz373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 08/06/2019] [Indexed: 05/30/2023]
Abstract
Embryogenesis is an essential process during seed development in higher plants. It has previously been shown that mutation of the Arabidopsis non-SMC element genes AtNSE1 or AtNSE3 leads to early embryo abortion, and their proteins can interact with each other directly. However, the crucial regions of these proteins in this interaction and how the proteins are cytologically involved in Arabidopsis embryo development are unknown. In this study, we found that the C-terminal including the Ring-like motif of AtNSE1 can interact with the N-terminal of AtNSE3, and only the Ring-like motif is essential for binding with three α motifs of AtNSE2 (homologous to AtMMS21). Using genetic assays and by analysing molecular markers of cell fate decisions (STM, WOX5, and WOX8) in mutant nse1 and nse3 embryos, we found that AtNSE1 and AtNSE3 work non-redundantly in early embryo development, and that differentiation of the apical meristem and the hypophysis fails in the mutants, which have disrupted auxin transportation and responses. However, the upper cells of the suspensor in the mutants seem to have proper embryo cell identity. Cytological examination showed that cell death occurred from the early embryo stage, and that vacuolar programmed cell death and necrosis in the nse1 and nse3 mutant embryos led to ovule abortion. Thus, AtNSE1 and AtNSE3 are essential for maintaining cell viability and growth during early embryogenesis. Our results improve our understanding of the functions of SMC5/6 complex in early embryogenesis in Arabidopsis.
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Affiliation(s)
- Gang Li
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Wenxuan Zou
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Liufang Jian
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Jie Qian
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
| | - Jie Zhao
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, China
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Sanlier N, Atik A, Atik I. Consumption of green coffee and the risk of chronic diseases. Crit Rev Food Sci Nutr 2018; 59:2573-2585. [DOI: 10.1080/10408398.2018.1461061] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Nevin Sanlier
- Lokman Hekim University, Faculty of Health Sciences, Department of Nutrition and Dietetics, Ankara, Turkey
| | - Azize Atik
- Afyon Kocatepe University, Sultandağı Vocational School, Food Technology Program, Afyonkarahisar, Turkey
| | - Ilker Atik
- Afyon Kocatepe University, Afyon Vocational School, Food Quality Control and Analysis Program, Afyonkarahisar, Turkey
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Delabaere L, Ertl HA, Massey DJ, Hofley CM, Sohail F, Bienenstock EJ, Sebastian H, Chiolo I, LaRocque JR. Aging impairs double-strand break repair by homologous recombination in Drosophila germ cells. Aging Cell 2017; 16:320-328. [PMID: 28000382 PMCID: PMC5334535 DOI: 10.1111/acel.12556] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2016] [Indexed: 12/23/2022] Open
Abstract
Aging is characterized by genome instability, which contributes to cancer formation and cell lethality leading to organismal decline. The high levels of DNA double-strand breaks (DSBs) observed in old cells and premature aging syndromes are likely a primary source of genome instability, but the underlying cause of their formation is still unclear. DSBs might result from higher levels of damage or repair defects emerging with advancing age, but repair pathways in old organisms are still poorly understood. Here, we show that premeiotic germline cells of young and old flies have distinct differences in their ability to repair DSBs by the error-free pathway homologous recombination (HR). Repair of DSBs induced by either ionizing radiation (IR) or the endonuclease I-SceI is markedly defective in older flies. This correlates with a remarkable reduction in HR repair measured with the DR-white DSB repair reporter assay. Strikingly, most of this repair defect is already present at 8 days of age. Finally, HR defects correlate with increased expression of early HR components and increased recruitment of Rad51 to damage in older organisms. Thus, we propose that the defect in the HR pathway for germ cells in older flies occurs following Rad51 recruitment. These data reveal that DSB repair defects arise early in the aging process and suggest that HR deficiencies are a leading cause of genome instability in germ cells of older animals.
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Affiliation(s)
- Laetitia Delabaere
- Molecular and Computational Biology Department; University of Southern California; Los Angeles CA 90089 USA
| | - Henry A. Ertl
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
| | - Dashiell J. Massey
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
| | - Carolyn M. Hofley
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
| | - Faraz Sohail
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
| | - Elisa J. Bienenstock
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
- College of Public Service & Community Solutions; Arizona State University; Phoenix AZ 85004 USA
| | - Hans Sebastian
- Molecular and Computational Biology Department; University of Southern California; Los Angeles CA 90089 USA
| | - Irene Chiolo
- Molecular and Computational Biology Department; University of Southern California; Los Angeles CA 90089 USA
| | - Jeannine R. LaRocque
- Department of Human Science; Georgetown University Medical Center; Washington DC 20057 USA
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8
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Tran M, Tsarouhas V, Kegel A. Early development of Drosophila embryos requires Smc5/6 function during oogenesis. Biol Open 2016; 5:928-41. [PMID: 27288507 PMCID: PMC4958276 DOI: 10.1242/bio.019000] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Mutations in structural maintenance of chromosomes (Smc) proteins are frequently associated with chromosomal abnormalities commonly observed in developmental disorders. However, the role of Smc proteins in development still remains elusive. To investigate Smc5/6 function during early embryogenesis we examined smc5 and smc6 mutants of the fruit fly Drosophila melanogaster using a combination of reverse genetics and microscopy approaches. Smc5/6 exhibited a maternally contributed function in maintaining chromosome stability during early embryo development, which manifested as female subfertility in its absence. Loss of Smc5/6 caused an arrest and a considerable delay in embryo development accompanied by fragmented nuclei and increased anaphase-bridge formation, respectively. Surprisingly, early embryonic arrest was attributable to the absence of Smc5/6 during oogenesis, which resulted in insufficient repair of pre-meiotic and meiotic DNA double-strand breaks. Thus, our findings contribute to the understanding of Smc proteins in higher eukaryotic development by highlighting a maternal function in chromosome maintenance and a link between oogenesis and early embryogenesis. Summary: Early emerging problems during oogenesis, such as DNA double-strand breaks, can affect chromosome duplication and segregation in embryogenesis in Drosophila. Moreover, environmental cues including temperature are important for proper oogenesis.
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Affiliation(s)
- Martin Tran
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm S-17177, Sweden
| | - Vasilios Tsarouhas
- Department of Molecular Bioscience, The Wenner-Gren Institute, Stockholm University, Stockholm S-10691, Sweden
| | - Andreas Kegel
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm S-17177, Sweden
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9
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Wang Y, DiMario P. Loss of Drosophila nucleostemin 2 (NS2) blocks nucleolar release of the 60S subunit leading to ribosome stress. Chromosoma 2016; 126:375-388. [PMID: 27150106 DOI: 10.1007/s00412-016-0597-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 04/18/2016] [Accepted: 04/25/2016] [Indexed: 12/24/2022]
Abstract
Four nucleostemin-like proteins (nucleostemin (NS) 1-4) were identified previously in Drosophila melanogaster. NS1 and NS2 are nucleolar proteins, while NS3 and NS4 are cytoplasmic proteins. We showed earlier that NS1 (homologous to human GNL3) enriches within the granular components (GCs) of Drosophila nucleoli and is required for efficient maturation or nucleolar release of the 60S subunit. Here, we show that NS2 is homologous to the human nucleostemin-like protein, Ngp1 (GNL2), and that endogenous NS2 is expressed in both progenitor and terminally differentiated cell types. Exogenous GFP-NS2 enriched within nucleolar GCs versus endogenous fibrillarin that marked the dense fibrillar components (DFCs). Like NS1, depletion of NS2 in midgut cells blocked the release of the 60S subunit as detected by the accumulation of GFP-RpL11 within nucleoli, and this likely led to the general loss of 60S subunits as shown by immunoblot analyses of RpL23a and RpL34. At the ultrastructural level, nucleoli in midgut cells depleted of NS2 displayed enlarged GCs not only on the nucleolar periphery but interspersed within the DFCs. Depletion of NS2 caused ribosome stress: larval midgut cells displayed prominent autophagy marked by the appearance of autolysosomes containing mCherry-ATG8a and the appearance of rough endoplasmic reticulum (rER)-derived isolation membranes. Larval imaginal wing disc cells depleted of NS2 induced apoptosis as marked by anti-caspase 3 labeling; loss of these progenitor cells resulted in defective adult wings. We conclude that nucleolar proteins NS1 and NS2 have similar but non-overlapping roles in the final maturation or nucleolar release of 60S ribosomal subunits.
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Affiliation(s)
- Yubo Wang
- Department of Biological Sciences, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA, 70803-1715, USA
| | - Patrick DiMario
- Department of Biological Sciences, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA, 70803-1715, USA.
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10
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Najarro MA, Hackett JL, Smith BR, Highfill CA, King EG, Long AD, Macdonald SJ. Identifying Loci Contributing to Natural Variation in Xenobiotic Resistance in Drosophila. PLoS Genet 2015; 11:e1005663. [PMID: 26619284 PMCID: PMC4664282 DOI: 10.1371/journal.pgen.1005663] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 10/21/2015] [Indexed: 12/12/2022] Open
Abstract
Natural populations exhibit a great deal of interindividual genetic variation in the response to toxins, exemplified by the variable clinical efficacy of pharmaceutical drugs in humans, and the evolution of pesticide resistant insects. Such variation can result from several phenomena, including variable metabolic detoxification of the xenobiotic, and differential sensitivity of the molecular target of the toxin. Our goal is to genetically dissect variation in the response to xenobiotics, and characterize naturally-segregating polymorphisms that modulate toxicity. Here, we use the Drosophila Synthetic Population Resource (DSPR), a multiparent advanced intercross panel of recombinant inbred lines, to identify QTL (Quantitative Trait Loci) underlying xenobiotic resistance, and employ caffeine as a model toxic compound. Phenotyping over 1,700 genotypes led to the identification of ten QTL, each explaining 4.5-14.4% of the broad-sense heritability for caffeine resistance. Four QTL harbor members of the cytochrome P450 family of detoxification enzymes, which represent strong a priori candidate genes. The case is especially strong for Cyp12d1, with multiple lines of evidence indicating the gene causally impacts caffeine resistance. Cyp12d1 is implicated by QTL mapped in both panels of DSPR RILs, is significantly upregulated in the presence of caffeine, and RNAi knockdown robustly decreases caffeine tolerance. Furthermore, copy number variation at Cyp12d1 is strongly associated with phenotype in the DSPR, with a trend in the same direction observed in the DGRP (Drosophila Genetic Reference Panel). No additional plausible causative polymorphisms were observed in a full genomewide association study in the DGRP, or in analyses restricted to QTL regions mapped in the DSPR. Just as in human populations, replicating modest-effect, naturally-segregating causative variants in an association study framework in flies will likely require very large sample sizes.
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Affiliation(s)
- Michael A. Najarro
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Jennifer L. Hackett
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Brittny R. Smith
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Chad A. Highfill
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
| | - Elizabeth G. King
- Division of Biological Sciences, University of Missouri, Columbia, Missouri, United States of America
| | - Anthony D. Long
- Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California, United States of America
| | - Stuart J. Macdonald
- Department of Molecular Biosciences, University of Kansas, Lawrence, Kansas, United States of America
- Center for Computational Biology, University of Kansas, Lawrence, Kansas, United States of America
- * E-mail:
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11
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Di Cara F, Maile TM, Parsons BD, Magico A, Basu S, Tapon N, King-Jones K. The Hippo pathway promotes cell survival in response to chemical stress. Cell Death Differ 2015; 22:1526-39. [PMID: 26021298 PMCID: PMC4532776 DOI: 10.1038/cdd.2015.10] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Revised: 01/08/2015] [Accepted: 01/09/2015] [Indexed: 12/18/2022] Open
Abstract
Cellular stress defense mechanisms have evolved to maintain homeostasis in response to a broad variety of environmental challenges. Stress signaling pathways activate multiple cellular programs that range from the activation of survival pathways to the initiation of cell death when cells are damaged beyond repair. To identify novel players acting in stress response pathways, we conducted a cell culture RNA interference (RNAi) screen using caffeine as a xenobiotic stress-inducing agent, as this compound is a well-established inducer of detoxification response pathways. Specifically, we examined how caffeine affects cell survival when Drosophila kinases and phosphatases were depleted via RNAi. Using this approach, we identified and validated 10 kinases and 4 phosphatases that are essential for cell survival under caffeine-induced stress both in cell culture and living flies. Remarkably, our screen yielded an enrichment of Hippo pathway components, indicating that this pathway regulates cellular stress responses. Indeed, we show that the Hippo pathway acts as a potent repressor of stress-induced cell death. Further, we demonstrate that Hippo activation is necessary to inhibit a pro-apoptotic program triggered by the interaction of the transcriptional co-activator Yki with the transcription factor p53 in response to a range of stress stimuli. Our in vitro and in vivo loss-of-function data therefore implicate Hippo signaling in the transduction of cellular survival signals in response to chemical stress.
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Affiliation(s)
- F Di Cara
- Department of Cell Biology, Medical Sciences Building, Faculty of Medicine & Dentistry, University of Alberta, Edmonton T6G 2H7, Alberta, Canada
| | - T M Maile
- Genentech Inc., 1 DNA Way, South San Francisco, CA, USA
| | - B D Parsons
- Department of Medical Microbiology and Immunology, 6-020 Katz Group Centre, University of Alberta, Edmonton AB T6G 2E1, Alberta, Canada
| | - A Magico
- Department of Pediatrics, Faculty of Medicine & Dentistry, Katz Group Centre, University of Alberta, Edmonton T6G 2H7, Alberta, Canada
| | - S Basu
- Centre for Molecular Oncology, Institute of Cancer, Barts and The London School of Medicine and Dentistry, John Vane Science Centre, Charterhouse Square, London EC1M 6BQ, UK
| | - N Tapon
- Apoptosis and Proliferation Control Laboratory, Cancer Research UK London Research Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - K King-Jones
- Department of Biological Sciences, University of Alberta, G-504 Biological Sciences Bldg, Edmonton T6G 2E9, Alberta, Canada
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12
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Mec1-dependent phosphorylation of Mms21 modulates its SUMO ligase activity. DNA Repair (Amst) 2015; 28:83-92. [DOI: 10.1016/j.dnarep.2015.01.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 01/12/2015] [Accepted: 01/15/2015] [Indexed: 12/25/2022]
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13
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Li X, Hughes SC, Wevrick R. Evaluation of melanoma antigen (MAGE) gene expression in human cancers using The Cancer Genome Atlas. Cancer Genet 2015; 208:25-34. [DOI: 10.1016/j.cancergen.2014.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 11/11/2014] [Accepted: 11/18/2014] [Indexed: 12/20/2022]
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14
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Abeysundara N, Leung AC, Primrose DA, Hughes SC. Regulation of cell proliferation and adhesion by means of a novel region of drosophila merlin interacting with Sip1. Dev Dyn 2014; 243:1554-70. [DOI: 10.1002/dvdy.24187] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 08/08/2014] [Accepted: 09/03/2014] [Indexed: 01/22/2023] Open
Affiliation(s)
- Namal Abeysundara
- Department of Medical Genetics; University of Alberta; Edmonton Alberta Canada
| | - Albert C. Leung
- Department of Medical Genetics; University of Alberta; Edmonton Alberta Canada
| | - David A. Primrose
- Department of Medical Genetics; University of Alberta; Edmonton Alberta Canada
| | - Sarah C. Hughes
- Department of Medical Genetics; University of Alberta; Edmonton Alberta Canada
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Loss of Caenorhabditis elegans BRCA1 promotes genome stability during replication in smc-5 mutants. Genetics 2014; 196:985-99. [PMID: 24424777 PMCID: PMC3982690 DOI: 10.1534/genetics.113.158295] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
DNA damage by ultraviolet (UV) light poses a risk for mutagenesis and a potential hindrance for cell cycle progression. Cells cope with UV-induced DNA damage through two general strategies to repair the damaged nucleotides and to promote cell cycle progression in the presence of UV-damaged DNA. Defining the genetic pathways and understanding how they function together to enable effective tolerance to UV remains an important area of research. The structural maintenance of chromosomes (SMC) proteins form distinct complexes that maintain genome stability during chromosome segregation, homologous recombination, and DNA replication. Using a forward genetic screen, we identified two alleles of smc-5 that exacerbate UV sensitivity in Caenorhabditis elegans. Germ cells of smc-5-defective animals show reduced proliferation, sensitivity to perturbed replication, chromatin bridge formation, and accumulation of RAD-51 foci that indicate the activation of homologous recombination at DNA double-strand breaks. Mutations in the translesion synthesis polymerase polh-1 act synergistically with smc-5 mutations in provoking genome instability after UV-induced DNA damage. In contrast, the DNA damage accumulation and sensitivity of smc-5 mutant strains to replication impediments are suppressed by mutations in the C. elegans BRCA1/BARD1 homologs, brc-1 and brd-1. We propose that SMC-5/6 promotes replication fork stability and facilitates recombination-dependent repair when the BRC-1/BRD-1 complex initiates homologous recombination at stalled replication forks. Our data suggest that BRC-1/BRD-1 can both promote and antagonize genome stability depending on whether homologous recombination is initiated during DNA double-strand break repair or during replication stalling.
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