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Ishiai M, Sato K, Tomida J, Kitao H, Kurumizaka H, Takata M. Activation of the FA pathway mediated by phosphorylation and ubiquitination. Mutat Res 2017; 803-805:89-95. [PMID: 28552166 DOI: 10.1016/j.mrfmmm.2017.05.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 05/04/2017] [Accepted: 05/04/2017] [Indexed: 12/15/2022]
Abstract
Fanconi anemia (FA) is a devastating hereditary condition that impacts genome integrity, leading to clinical features such as skeletal and visceral organ malformations, attrition of bone marrow stem cells, and carcinogenesis. At least 21 proteins, when absent or defective, have been implicated in this disorder, and they together constitute the FA pathway, which functions in detection and repair of, and tolerance to, endogenous DNA damage. The damage primarily handled by the FA pathway has been assumed to be related to DNA interstrand crosslinks (ICLs). The FA pathway is activated upon ICL damage, and a hallmark of this activation is the mono-ubiquitination events of the key FANCD2-FANCI protein complex. Recent data have revealed unexpectedly complex details in the regulation of FA pathway activation by ICLs. In this short review, we summarize the knowledge accumulated over the years regarding how the FA pathway is activated via protein modifications.
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Affiliation(s)
- Masamichi Ishiai
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Koichi Sato
- Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan
| | - Junya Tomida
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Hiroyuki Kitao
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Hitoshi Kurumizaka
- Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan.
| | - Minoru Takata
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan.
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Ling C, Huang J, Yan Z, Li Y, Ohzeki M, Ishiai M, Xu D, Takata M, Seidman M, Wang W. Bloom syndrome complex promotes FANCM recruitment to stalled replication forks and facilitates both repair and traverse of DNA interstrand crosslinks. Cell Discov 2016; 2:16047. [PMID: 28058110 PMCID: PMC5167996 DOI: 10.1038/celldisc.2016.47] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 11/10/2016] [Indexed: 12/26/2022] Open
Abstract
The recruitment of FANCM, a conserved DNA translocase and key component of several DNA repair protein complexes, to replication forks stalled by DNA interstrand crosslinks (ICLs) is a step upstream of the Fanconi anemia (FA) repair and replication traverse pathways of ICLs. However, detection of the FANCM recruitment has been technically challenging so that its mechanism remains exclusive. Here, we successfully observed recruitment of FANCM at stalled forks using a newly developed protocol. We report that the FANCM recruitment depends upon its intrinsic DNA translocase activity, and its DNA-binding partner FAAP24. Moreover, it is dependent on the replication checkpoint kinase, ATR; but is independent of the FA core and FANCD2-FANCI complexes, two essential components of the FA pathway, indicating that the FANCM recruitment occurs downstream of ATR but upstream of the FA pathway. Interestingly, the recruitment of FANCM requires its direct interaction with Bloom syndrome complex composed of BLM helicase, Topoisomerase 3α, RMI1 and RMI2; as well as the helicase activity of BLM. We further show that the FANCM-BLM complex interaction is critical for replication stress-induced FANCM hyperphosphorylation, for normal activation of the FA pathway in response to ICLs, and for efficient traverse of ICLs by the replication machinery. Epistasis studies demonstrate that FANCM and BLM work in the same pathway to promote replication traverse of ICLs. We conclude that FANCM and BLM complex work together at stalled forks to promote both FA repair and replication traverse pathways of ICLs.
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Affiliation(s)
- Chen Ling
- Lab of Genetics, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Jing Huang
- Lab of Molecular Gerontology, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Zhijiang Yan
- Lab of Genetics, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Yongjiang Li
- Lab of Genetics, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Mioko Ohzeki
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Masamichi Ishiai
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Dongyi Xu
- Lab of Genetics, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Minoru Takata
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Kyoto University, Kyoto, Japan
| | - Michael Seidman
- Lab of Molecular Gerontology, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
| | - Weidong Wang
- Lab of Genetics, National Institute on Aging, National Institute of Health, Baltimore, MD, USA
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Adam S, Melguizo Sanchis D, El-Kamah G, Samarasinghe S, Alharthi S, Armstrong L, Lako M. Concise Review: Getting to the Core of Inherited Bone Marrow Failures. Stem Cells 2016; 35:284-298. [PMID: 27870251 PMCID: PMC5299470 DOI: 10.1002/stem.2543] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 10/15/2016] [Accepted: 10/28/2016] [Indexed: 12/20/2022]
Abstract
Bone marrow failure syndromes (BMFS) are a group of disorders with complex pathophysiology characterized by a common phenotype of peripheral cytopenia and/or hypoplastic bone marrow. Understanding genetic factors contributing to the pathophysiology of BMFS has enabled the identification of causative genes and development of diagnostic tests. To date more than 40 mutations in genes involved in maintenance of genomic stability, DNA repair, ribosome and telomere biology have been identified. In addition, pathophysiological studies have provided insights into several biological pathways leading to the characterization of genotype/phenotype correlations as well as the development of diagnostic approaches and management strategies. Recent developments in bone marrow transplant techniques and the choice of conditioning regimens have helped improve transplant outcomes. However, current morbidity and mortality remain unacceptable underlining the need for further research in this area. Studies in mice have largely been unable to mimic disease phenotype in humans due to difficulties in fully replicating the human mutations and the differences between mouse and human cells with regard to telomere length regulation, processing of reactive oxygen species and lifespan. Recent advances in induced pluripotency have provided novel insights into disease pathogenesis and have generated excellent platforms for identifying signaling pathways and functional mapping of haplo‐insufficient genes involved in large‐scale chromosomal deletions–associated disorders. In this review, we have summarized the current state of knowledge in the field of BMFS with specific focus on modeling the inherited forms and how to best utilize these models for the development of targeted therapies. Stem Cells2017;35:284–298
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Affiliation(s)
- Soheir Adam
- Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA.,Hematology Department, Medical School, King Abdulaziz University, Jeddah, KSA
| | | | - Ghada El-Kamah
- Division of Human Genetics & Genome Research, National Research Center, Cairo, Egypt
| | - Sujith Samarasinghe
- Department of Hematology, Great Ormond Street Hospital for Children NHS Foundation Trust, London, United Kingdom
| | - Sameer Alharthi
- Princess Al Jawhara Al-Brahim Center of Excellence in Research of Hereditary Disorders, King Abdulaziz University, KSA
| | - Lyle Armstrong
- Institute of Genetic Medicine, Newcastle University, United Kingdom
| | - Majlinda Lako
- Institute of Genetic Medicine, Newcastle University, United Kingdom
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Vuono EA, Mukherjee A, Vierra DA, Adroved MM, Hodson C, Deans AJ, Howlett NG. The PTEN phosphatase functions cooperatively with the Fanconi anemia proteins in DNA crosslink repair. Sci Rep 2016; 6:36439. [PMID: 27819275 PMCID: PMC5098254 DOI: 10.1038/srep36439] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 10/17/2016] [Indexed: 11/13/2022] Open
Abstract
Fanconi anemia (FA) is a genetic disease characterized by bone marrow failure and increased cancer risk. The FA proteins function primarily in DNA interstrand crosslink (ICL) repair. Here, we have examined the role of the PTEN phosphatase in this process. We have established that PTEN-deficient cells, like FA cells, exhibit increased cytotoxicity, chromosome structural aberrations, and error-prone mutagenic DNA repair following exposure to ICL-inducing agents. The increased ICL sensitivity of PTEN-deficient cells is caused, in part, by elevated PLK1 kinase-mediated phosphorylation of FANCM, constitutive FANCM polyubiquitination and degradation, and the consequent inefficient assembly of the FA core complex, FANCD2, and FANCI into DNA repair foci. We also establish that PTEN function in ICL repair is dependent on its protein phosphatase activity and ability to be SUMOylated, yet is independent of its lipid phosphatase activity. Finally, via epistasis analysis, we demonstrate that PTEN and FANCD2 function cooperatively in ICL repair.
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Affiliation(s)
- Elizabeth A. Vuono
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, Rhode Island, USA
| | - Ananda Mukherjee
- Department of Obstetrics, Gynecology, and Reproductive Biology, Michigan State University, Grand Rapids, Michigan, USA
| | - David A. Vierra
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, Rhode Island, USA
| | - Morganne M. Adroved
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, Rhode Island, USA
| | - Charlotte Hodson
- Genome Stability Unit, St. Vincent’s Institute, Fitzroy, VIC 3065, Australia
| | - Andrew J. Deans
- Genome Stability Unit, St. Vincent’s Institute, Fitzroy, VIC 3065, Australia
- Department of Medicine, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Niall G. Howlett
- Department of Cell and Molecular Biology, University of Rhode Island, Kingston, Rhode Island, USA
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Fu C, Begum K, Jordan PW, He Y, Overbeek PA. Dearth and Delayed Maturation of Testicular Germ Cells in Fanconi Anemia E Mutant Male Mice. PLoS One 2016; 11:e0159800. [PMID: 27486799 PMCID: PMC4972424 DOI: 10.1371/journal.pone.0159800] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 07/09/2016] [Indexed: 12/20/2022] Open
Abstract
After using a self-inactivating lentivirus for non-targeted insertional mutagenesis in mice, we identified a transgenic family with a recessive mutation that resulted in reduced fertility in homozygous transgenic mice. The lentiviral integration site was amplified by inverse PCR. Sequencing revealed that integration had occurred in intron 8 of the mouse Fance gene, which encodes the Fanconi anemia E (Fance) protein. Fanconi anemia (FA) proteins play pivotal roles in cellular responses to DNA damage and Fance acts as a molecular bridge between the FA core complex and Fancd2. To investigate the reduced fertility in the mutant males, we analyzed postnatal development of testicular germ cells. At one week after birth, most tubules in the mutant testes contained few or no germ cells. Over the next 2–3 weeks, germ cells accumulated in a limited number of tubules, so that some tubules contained germ cells around the full periphery of the tubule. Once sufficient numbers of germ cells had accumulated, they began to undergo the later stages of spermatogenesis. Immunoassays revealed that the Fancd2 protein accumulated around the periphery of the nucleus in normal developing spermatocytes, but we did not detect a similar localization of Fancd2 in the Fance mutant testes. Our assays indicate that although Fance mutant males are germ cell deficient at birth, the extant germ cells can proliferate and, if they reach a threshold density, can differentiate into mature sperm. Analogous to previous studies of FA genes in mice, our results show that the Fance protein plays an important, but not absolutely essential, role in the initial developmental expansion of the male germ line.
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Affiliation(s)
- Chun Fu
- Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, 410011, China
- * E-mail:
| | - Khurshida Begum
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, 77030, United States of America
| | - Philip W. Jordan
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, United States of America
| | - Yan He
- Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, 410011, China
| | - Paul A. Overbeek
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, 77030, United States of America
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Xue X, Papusha A, Choi K, Bonner JN, Kumar S, Niu H, Kaur H, Zheng XF, Donnianni RA, Lu L, Lichten M, Zhao X, Ira G, Sung P. Differential regulation of the anti-crossover and replication fork regression activities of Mph1 by Mte1. Genes Dev 2016; 30:687-99. [PMID: 26966246 PMCID: PMC4803054 DOI: 10.1101/gad.276139.115] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/17/2016] [Indexed: 02/03/2023]
Abstract
Xue et al. identified Mte1 as a multifunctional regulator of S. cerevisiae Mph1. Mte1 stimulates Mph1-mediated DNA replication fork regression and branch migration in a model substrate. Surprisingly, Mte1 antagonizes the D-loop-dissociative activity of Mph1–MHF and exerts a procrossover role in mitotic recombination. We identified Mte1 (Mph1-associated telomere maintenance protein 1) as a multifunctional regulator of Saccharomyces cerevisiae Mph1, a member of the FANCM family of DNA motor proteins important for DNA replication fork repair and crossover suppression during homologous recombination. We show that Mte1 interacts with Mph1 and DNA species that resemble a DNA replication fork and the D loop formed during recombination. Biochemically, Mte1 stimulates Mph1-mediated DNA replication fork regression and branch migration in a model substrate. Consistent with this activity, genetic analysis reveals that Mte1 functions with Mph1 and the associated MHF complex in replication fork repair. Surprisingly, Mte1 antagonizes the D-loop-dissociative activity of Mph1–MHF and exerts a procrossover role in mitotic recombination. We further show that the influence of Mte1 on Mph1 activities requires its binding to Mph1 and DNA. Thus, Mte1 differentially regulates Mph1 activities to achieve distinct outcomes in recombination and replication fork repair.
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Affiliation(s)
- Xiaoyu Xue
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Alma Papusha
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Koyi Choi
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Jacob N Bonner
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Sandeep Kumar
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Hengyao Niu
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Hardeep Kaur
- Laboratory of Biochemistry and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Xiao-Feng Zheng
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Roberto A Donnianni
- Department of Microbiology and Immunology, Columbia University Medical Center, New York, New York 10032, USA
| | - Lucy Lu
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Michael Lichten
- Laboratory of Biochemistry and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Xiaolan Zhao
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Grzegorz Ira
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Patrick Sung
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
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Fu C, Begum K, Overbeek PA. Primary Ovarian Insufficiency Induced by Fanconi Anemia E Mutation in a Mouse Model. PLoS One 2016; 11:e0144285. [PMID: 26939056 PMCID: PMC4777492 DOI: 10.1371/journal.pone.0144285] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 01/18/2016] [Indexed: 01/18/2023] Open
Abstract
In most cases of primary ovarian insufficiency (POI), the cause of the depletion of ovarian follicles is unknown. Fanconi anemia (FA) proteins are known to play important roles in follicular development. Using random insertional mutagenesis with a lentiviral transgene, we identified a family with reduced fertility in the homozygous transgenic mice. We identified the integration site and found that the lentivirus had integrated into intron 8 of the Fanconi E gene (Fance). By RT-PCR and in situ hybridization, we found that Fance transcript levels were significantly reduced. The Fance homozygous mutant mice were assayed for changes in ovarian development, follicle numbers and estrous cycle. Ovarian dysplasias and a severe lack of follicles were seen in the mutant mice. In addition, the estrous cycle was disrupted in adult females. Our results suggest that POI has been induced by the Fance mutation in this new mouse model.
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Affiliation(s)
- Chun Fu
- Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
- * E-mail:
| | - Khurshida Begum
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
| | - Paul A. Overbeek
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, Texas, United States of America
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Abstract
Members of the conserved FANCM family of DNA motor proteins play key roles in genome maintenance processes. In this review, Xue et al. provide an integrated view of the functions and regulation of these enzymes in humans and model organisms and how they advance our understanding of genome maintenance processes. Members of the conserved FANCM family of DNA motor proteins play key roles in genome maintenance processes. FANCM supports genome duplication and repair under different circumstances and also functions in the ATR-mediated DNA damage checkpoint. Some of these roles are shared among lower eukaryotic family members. Human FANCM has been linked to Fanconi anemia, a syndrome characterized by cancer predisposition, developmental disorder, and bone marrow failure. Recent studies on human FANCM and its orthologs from other organisms have provided insights into their biological functions, regulation, and collaboration with other genome maintenance factors. This review summarizes the progress made, with the goal of providing an integrated view of the functions and regulation of these enzymes in humans and model organisms and how they advance our understanding of genome maintenance processes.
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Affiliation(s)
- Xiaoyu Xue
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Patrick Sung
- Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA
| | - Xiaolan Zhao
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
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Dong H, Nebert DW, Bruford EA, Thompson DC, Joenje H, Vasiliou V. Update of the human and mouse Fanconi anemia genes. Hum Genomics 2015; 9:32. [PMID: 26596371 PMCID: PMC4657327 DOI: 10.1186/s40246-015-0054-y] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 11/10/2015] [Indexed: 12/24/2022] Open
Abstract
Fanconi anemia (FA) is a recessively inherited disease manifesting developmental abnormalities, bone marrow failure, and increased risk of malignancies. Whereas FA has been studied for nearly 90 years, only in the last 20 years have increasing numbers of genes been implicated in the pathogenesis associated with this genetic disease. To date, 19 genes have been identified that encode Fanconi anemia complementation group proteins, all of which are named or aliased, using the root symbol “FANC.” Fanconi anemia subtype (FANC) proteins function in a common DNA repair pathway called “the FA pathway,” which is essential for maintaining genomic integrity. The various FANC mutant proteins contribute to distinct steps associated with FA pathogenesis. Herein, we provide a review update of the 19 human FANC and their mouse orthologs, an evolutionary perspective on the FANC genes, and the functional significance of the FA DNA repair pathway in association with clinical disorders. This is an example of a set of genes––known to exist in vertebrates, invertebrates, plants, and yeast––that are grouped together on the basis of shared biochemical and physiological functions, rather than evolutionary phylogeny, and have been named on this basis by the HUGO Gene Nomenclature Committee (HGNC).
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Affiliation(s)
- Hongbin Dong
- Department of Environmental Health Sciences, Yale School of Public Health, 60 College St, New Haven, CT, 06250, USA
| | - Daniel W Nebert
- Department of Environmental Health and Center for Environmental Genetics, University Cincinnati Medical Center, Cincinnati, OH, 45267-0056, USA
| | - Elspeth A Bruford
- HUGO Gene Nomenclature Committee (HGNC), European Bioinformatics Institute (EMBL-EBI), European Molecular Biology Laboratory, Hinxton, CB10 1SD, UK
| | - David C Thompson
- Department of Clinical Practice, University of Colorado Denver, Aurora, CO, 80045, USA
| | - Hans Joenje
- Department of Clinical Genetics and the Cancer Center Amsterdam/VUmc Institute for Cancer and Immunology, VU University Medical Center, NL-1081 BT, Amsterdam, The Netherlands
| | - Vasilis Vasiliou
- Department of Environmental Health Sciences, Yale School of Public Health, 60 College St, New Haven, CT, 06250, USA.
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60
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Luo Y, Schimenti JC. MCM9 deficiency delays primordial germ cell proliferation independent of the ATM pathway. Genesis 2015; 53:678-84. [DOI: 10.1002/dvg.22901] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/14/2015] [Accepted: 09/17/2015] [Indexed: 02/02/2023]
Affiliation(s)
- Yunhai Luo
- Department of Biomedical Sciences; Cornell University; Ithaca New York
| | - John C. Schimenti
- Department of Biomedical Sciences; Cornell University; Ithaca New York
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61
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Beumer JH, Fu KY, Anyang BN, Siegfried JM, Bakkenist CJ. Functional analyses of ATM, ATR and Fanconi anemia proteins in lung carcinoma : ATM, ATR and FA in lung carcinoma. BMC Cancer 2015; 15:649. [PMID: 26438152 PMCID: PMC4595318 DOI: 10.1186/s12885-015-1649-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 09/11/2015] [Indexed: 11/10/2022] Open
Abstract
Background ATM and ATR are kinases implicated in a myriad of DNA-damage responses. ATM kinase inhibition radiosensitizes cells and selectively kills cells with Fanconi anemia (FA) gene mutations. ATR kinase inhibition sensitizes cells to agents that induce replication stress and selectively kills cells with ATM and TP53 mutations. ATM mutations and FANCF promoter-methylation are reported in lung carcinomas. Methods We undertook functional analyses of ATM, ATR, Chk1 and FA proteins in lung cancer cell lines. We included Calu6 that is reported to be FANCL-deficient. In addition, the cancer genome atlas (TCGA) database was interrogated for alterations in: 1) ATM, MRE11A, RAD50 and NBN; 2) ATR, ATRIP and TOPBP1; and 3) 15 FA genes. Results No defects in ATM, ATR or Chk1 kinase activation, or FANCD2 monoubiquitination were identified in the lung cancer cell lines examined, including Calu6, and major alterations in these pathways were not identified in the TCGA database. Cell lines were radiosensitized by ATM kinase inhibitor KU60019, but no cell killing by ATM kinase inhibitor alone was observed. While no synergy between gemcitabine or carboplatin and ATR kinase inhibitor ETP-46464 was observed, synergy between gemcitabine and Chk1 kinase inhibitor UCN-01 was observed in 54 T, 201 T and H460, and synergy between carboplatin and Chk1 kinase inhibitor was identified in 201 T and 239 T. No interactions between ATM, ATR and FA activation were observed by either ATM or ATR kinase inhibition in the lung cancer cell lines. Conclusions Analyses of ATM serine 1981 and Chk1 serine 345 phosphorylation, and FANCD2 monoubiquitination revealed that ATM and ATR kinase activation and FA pathway signaling are intact in the lung cancer cell lines examined. As such, these posttranslational modifications may have utility as biomarkers for the integrity of DNA damage signaling pathways in lung cancer. Different sensitization profiles between gemcitabine and carboplatin and ATR kinase inhibitor ETP-46464 and Chk1 kinase inhibitor UCN-01 were observed and this should be considered in the rationale for Phase I clinical trial design with ATR kinase inhibitors. Electronic supplementary material The online version of this article (doi:10.1186/s12885-015-1649-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jan H Beumer
- Department of Pharmaceutical Sciences, University of Pittsburgh School of Pharmacy, Pittsburgh, PA, USA. .,Molecular Therapeutics Drug Discovery Program, University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA.
| | - Katherine Y Fu
- Department of Radiation Oncology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.
| | - Bean N Anyang
- Molecular Therapeutics Drug Discovery Program, University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA.
| | - Jill M Siegfried
- Department of Pharmacology, Masonic Cancer Center, University of Minnesota Medical School, Minneapolis, MN, USA.
| | - Christopher J Bakkenist
- Department of Radiation Oncology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. .,Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. .,Hillman Cancer Center, Research Pavilion, Suite 2.6, 5117 Centre Avenue, Pittsburgh, PA, 15213-1863, USA.
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62
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Abstract
Understanding how frequently spontaneous replication arrests occur and how archaea deal with these arrests are very interesting and challenging research topics. Here we will described how genetic and imaging studies have revealed the central role of the archaeal helicase/nuclease Hef belonging to the XPF/MUS81/FANCM family of endonucleases in repair of arrested replication forks. Special focus will be on description of a recently developed combination of genetic and imaging tools to study the dynamic localization of a functional Hef::GFP (Green Fluorescent Protein) fusion protein in the living cells of halophilic archaea Haloferax volcanii. As Archaea provide an excellent and unique model for understanding how DNA replication is regulated to allow replication of a circular DNA molecule either from single or multiple replication origins, we will also summarize recent studies that have revealed peculiar features regarding DNA replication, particularly in halophilic archaea. We strongly believe that fundamental knowledge of our on-going studies will shed light on the evolutionary history of the DNA replication machinery and will help to establish general rules concerning replication restart and the key role of recombination proteins not only in bacteria, yeast and higher eukaryotes but also in archaea.
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Peterlongo P, Catucci I, Colombo M, Caleca L, Mucaki E, Bogliolo M, Marin M, Damiola F, Bernard L, Pensotti V, Volorio S, Dall'Olio V, Meindl A, Bartram C, Sutter C, Surowy H, Sornin V, Dondon MG, Eon-Marchais S, Stoppa-Lyonnet D, Andrieu N, Sinilnikova OM, Mitchell G, James PA, Thompson E, Marchetti M, Verzeroli C, Tartari C, Capone GL, Putignano AL, Genuardi M, Medici V, Marchi I, Federico M, Tognazzo S, Matricardi L, Agata S, Dolcetti R, Della Puppa L, Cini G, Gismondi V, Viassolo V, Perfumo C, Mencarelli MA, Baldassarri M, Peissel B, Roversi G, Silvestri V, Rizzolo P, Spina F, Vivanet C, Tibiletti MG, Caligo MA, Gambino G, Tommasi S, Pilato B, Tondini C, Corna C, Bonanni B, Barile M, Osorio A, Benitez J, Balestrino L, Ottini L, Manoukian S, Pierotti MA, Renieri A, Varesco L, Couch FJ, Wang X, Devilee P, Hilbers FS, van Asperen CJ, Viel A, Montagna M, Cortesi L, Diez O, Balmaña J, Hauke J, Schmutzler RK, Papi L, Pujana MA, Lázaro C, Falanga A, Offit K, Vijai J, Campbell I, Burwinkel B, Kvist A, Ehrencrona H, Mazoyer S, Pizzamiglio S, Verderio P, Surralles J, Rogan PK, Radice P. FANCM c.5791C>T nonsense mutation (rs144567652) induces exon skipping, affects DNA repair activity and is a familial breast cancer risk factor. Hum Mol Genet 2015; 24:5345-55. [PMID: 26130695 DOI: 10.1093/hmg/ddv251] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 06/25/2015] [Indexed: 11/15/2022] Open
Abstract
Numerous genetic factors that influence breast cancer risk are known. However, approximately two-thirds of the overall familial risk remain unexplained. To determine whether some of the missing heritability is due to rare variants conferring high to moderate risk, we tested for an association between the c.5791C>T nonsense mutation (p.Arg1931*; rs144567652) in exon 22 of FANCM gene and breast cancer. An analysis of genotyping data from 8635 familial breast cancer cases and 6625 controls from different countries yielded an association between the c.5791C>T mutation and breast cancer risk [odds ratio (OR) = 3.93 (95% confidence interval (CI) = 1.28-12.11; P = 0.017)]. Moreover, we performed two meta-analyses of studies from countries with carriers in both cases and controls and of all available data. These analyses showed breast cancer associations with OR = 3.67 (95% CI = 1.04-12.87; P = 0.043) and OR = 3.33 (95% CI = 1.09-13.62; P = 0.032), respectively. Based on information theory-based prediction, we established that the mutation caused an out-of-frame deletion of exon 22, due to the creation of a binding site for the pre-mRNA processing protein hnRNP A1. Furthermore, genetic complementation analyses showed that the mutation influenced the DNA repair activity of the FANCM protein. In summary, we provide evidence for the first time showing that the common p.Arg1931* loss-of-function variant in FANCM is a risk factor for familial breast cancer.
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Affiliation(s)
- Paolo Peterlongo
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Preventive and Predictive Medicine,
| | - Irene Catucci
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Preventive and Predictive Medicine
| | - Mara Colombo
- Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Preventive and Predictive Medicine
| | - Laura Caleca
- Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Preventive and Predictive Medicine
| | - Eliseos Mucaki
- Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Massimo Bogliolo
- Genome Instability and DNA Repair Group, Department of Genetics and Microbiology, Universitat Autònoma de Barcelona and Center for Biomedical Network Research on Rare Diseases (CIBERER), Barcelona, Spain
| | - Maria Marin
- Genome Instability and DNA Repair Group, Department of Genetics and Microbiology, Universitat Autònoma de Barcelona and Center for Biomedical Network Research on Rare Diseases (CIBERER), Barcelona, Spain
| | - Francesca Damiola
- Cancer Research Centre of Lyon, CNRS UMR5286, INSERM U1052, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France
| | - Loris Bernard
- Department of Experimental Oncology and Cogentech, Cancer Genetic Test Laboratory, Milan, Italy
| | - Valeria Pensotti
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Cogentech, Cancer Genetic Test Laboratory, Milan, Italy
| | - Sara Volorio
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Cogentech, Cancer Genetic Test Laboratory, Milan, Italy
| | - Valentina Dall'Olio
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Cogentech, Cancer Genetic Test Laboratory, Milan, Italy
| | - Alfons Meindl
- Division of Gynaecology and Obstetrics, Technische Universität München, Munich, Germany
| | - Claus Bartram
- Institute of Human Genetics, University of Heidelberg, Heidelberg, Germany
| | - Christian Sutter
- Institute of Human Genetics, University of Heidelberg, Heidelberg, Germany
| | - Harald Surowy
- Molecular Biology of Breast Cancer, Department of Obstetrics and Gynecology, University Hospital Heidelberg, Heidelberg, Germany, Molecular Epidemiology Group, C080, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Valérie Sornin
- Cancer Research Centre of Lyon, CNRS UMR5286, INSERM U1052, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France
| | - Marie-Gabrielle Dondon
- INSERM, U900, Paris, France, Institut Curie, Paris, France, Mines ParisTech, Fontainebleau, France
| | - Séverine Eon-Marchais
- INSERM, U900, Paris, France, Institut Curie, Paris, France, Mines ParisTech, Fontainebleau, France
| | - Dominique Stoppa-Lyonnet
- Service de Génétique Oncologique, Institut Curie, Paris, France, INSERM, U830, Paris, France, Université Paris-Descartes, Paris, France
| | - Nadine Andrieu
- INSERM, U900, Paris, France, Institut Curie, Paris, France, Mines ParisTech, Fontainebleau, France
| | - Olga M Sinilnikova
- Cancer Research Centre of Lyon, CNRS UMR5286, INSERM U1052, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France, Unité Mixte de Génétique Constitutionnelle des Cancers Fréquents, Centre Hospitalier Universitaire de Lyon/Centre Léon Bérard, Lyon, France
| | | | - Gillian Mitchell
- Familial Cancer Centre, Sir Peter MacCallum Department of Oncology and
| | - Paul A James
- Familial Cancer Centre, Sir Peter MacCallum Department of Oncology and
| | - Ella Thompson
- Cancer Genetics Laboratory and Sir Peter MacCallum Department of Oncology and
| | | | | | | | - Cristina Verzeroli
- Kathleen Cunningham Foundation Consortium for Research into Familial Breast Cancer (kConFab), Peter MacCallum Cancer Centre, East Melbourne, Victoria, Australia
| | - Carmen Tartari
- Department of Immunohematology and Transfusion Medicine and
| | - Gabriele Lorenzo Capone
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche, Università di Firenze, Firenze, Italy, FiorGen Foundation for Pharmacogenomics, Sesto Fiorentino, Italy
| | - Anna Laura Putignano
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche, Università di Firenze, Firenze, Italy, FiorGen Foundation for Pharmacogenomics, Sesto Fiorentino, Italy
| | - Maurizio Genuardi
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche, Università di Firenze, Firenze, Italy, FiorGen Foundation for Pharmacogenomics, Sesto Fiorentino, Italy, Institute of Medical Genetics, 'A. Gemelli' School of Medicine, Catholic University, Rome, Italy
| | - Veronica Medici
- Dipartimento di Oncologia, Ematologia e Malattie dell'Apparato Respiratorio, Università di Modena e Reggio Emilia, Modena, Italy
| | - Isabella Marchi
- Dipartimento di Oncologia, Ematologia e Malattie dell'Apparato Respiratorio, Università di Modena e Reggio Emilia, Modena, Italy
| | - Massimo Federico
- Dipartimento di Oncologia, Ematologia e Malattie dell'Apparato Respiratorio, Università di Modena e Reggio Emilia, Modena, Italy
| | - Silvia Tognazzo
- Immunology and Molecular Oncology Unit, Istituto Oncologico Veneto IOV - IRCCS, Padua, Italy
| | - Laura Matricardi
- Immunology and Molecular Oncology Unit, Istituto Oncologico Veneto IOV - IRCCS, Padua, Italy
| | - Simona Agata
- Immunology and Molecular Oncology Unit, Istituto Oncologico Veneto IOV - IRCCS, Padua, Italy
| | | | - Lara Della Puppa
- Unit of Experimental Oncology 1, CRO Aviano National Cancer Institute, Aviano (PN), Italy
| | - Giulia Cini
- Unit of Experimental Oncology 1, CRO Aviano National Cancer Institute, Aviano (PN), Italy
| | - Viviana Gismondi
- Unit of Hereditary Cancers, IRCCS AOU San Martino - IST, Genoa, Italy
| | - Valeria Viassolo
- Unit of Hereditary Cancers, IRCCS AOU San Martino - IST, Genoa, Italy
| | - Chiara Perfumo
- Unit of Hereditary Cancers, IRCCS AOU San Martino - IST, Genoa, Italy
| | - Maria Antonietta Mencarelli
- Medical Genetics, University of Siena, Siena, Italy, Genetica Medica, Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Margherita Baldassarri
- Medical Genetics, University of Siena, Siena, Italy, Genetica Medica, Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Bernard Peissel
- Unit of Medical Genetics, Department of Preventive and Predictive Medicine
| | - Gaia Roversi
- Unit of Medical Genetics, Department of Preventive and Predictive Medicine
| | | | - Piera Rizzolo
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | | | | | | | - Maria Adelaide Caligo
- Section of Genetic Oncology, University Hospital and University of Pisa, Pisa, Italy
| | - Gaetana Gambino
- Section of Genetic Oncology, University Hospital and University of Pisa, Pisa, Italy
| | - Stefania Tommasi
- IRCCS Istituto Tumori 'Giovanni Paolo II', Molecular Genetics Laboratory, Bari, Italy
| | - Brunella Pilato
- IRCCS Istituto Tumori 'Giovanni Paolo II', Molecular Genetics Laboratory, Bari, Italy
| | - Carlo Tondini
- Unit of Medical Oncology, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy
| | - Chiara Corna
- Unit of Medical Oncology, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy
| | - Bernardo Bonanni
- Division of Cancer Prevention and Genetics, Istituto Europeo di Oncologia, Milan, Italy
| | - Monica Barile
- Division of Cancer Prevention and Genetics, Istituto Europeo di Oncologia, Milan, Italy
| | - Ana Osorio
- Human Cancer Genetics Programme, Spanish National Cancer Centre (CNIO), Madrid, Spain, Spanish Genotyping Centre (CEGEN), Madrid, Spain
| | - Javier Benitez
- Human Cancer Genetics Programme, Spanish National Cancer Centre (CNIO), Madrid, Spain, Spanish Genotyping Centre (CEGEN), Madrid, Spain
| | | | - Laura Ottini
- Department of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | | | | | - Alessandra Renieri
- Medical Genetics, University of Siena, Siena, Italy, Genetica Medica, Azienda Ospedaliera Universitaria Senese, Siena, Italy
| | - Liliana Varesco
- Unit of Hereditary Cancers, IRCCS AOU San Martino - IST, Genoa, Italy
| | - Fergus J Couch
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Xianshu Wang
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Peter Devilee
- Department of Human Genetics, Department of Pathology and
| | | | - Christi J van Asperen
- Department of Clinical Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Alessandra Viel
- Unit of Experimental Oncology 1, CRO Aviano National Cancer Institute, Aviano (PN), Italy
| | - Marco Montagna
- Immunology and Molecular Oncology Unit, Istituto Oncologico Veneto IOV - IRCCS, Padua, Italy
| | - Laura Cortesi
- Dipartimento di Oncologia, Ematologia e Malattie dell'Apparato Respiratorio, Università di Modena e Reggio Emilia, Modena, Italy
| | - Orland Diez
- Oncogenetics Group, Hospital Universitari de la Vall d'Hebron, Barcelona, Spain, Vall d́Hebron Institute of Oncology (VHIO), Barcelona, Spain, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Judith Balmaña
- Vall d́Hebron Institute of Oncology (VHIO), Barcelona, Spain, Department of Medical Oncology, Hospital Universitari de la Vall d́Hebron, Barcelona, Spain
| | - Jan Hauke
- Center for Familial Breast and Ovarian Cancer, University Hospital of Cologne, Cologne, Germany
| | - Rita K Schmutzler
- Center for Familial Breast and Ovarian Cancer, University Hospital of Cologne, Cologne, Germany
| | - Laura Papi
- Dipartimento di Scienze Biomediche Sperimentali e Cliniche, Università di Firenze, Firenze, Italy
| | | | - Conxi Lázaro
- Catalan Institute of Oncology - IDIBELL, Barcelona, Spain
| | - Anna Falanga
- Department of Immunohematology and Transfusion Medicine and
| | - Kenneth Offit
- Clinical Genetics Service, Department of Medicine and Department of Cancer Biology and Genetics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Joseph Vijai
- Clinical Genetics Service, Department of Medicine and Department of Cancer Biology and Genetics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Ian Campbell
- Cancer Genetics Laboratory and Sir Peter MacCallum Department of Oncology and Department of Pathology, University of Melbourne, Parkville, Victoria, Australia
| | - Barbara Burwinkel
- Molecular Biology of Breast Cancer, Department of Obstetrics and Gynecology, University Hospital Heidelberg, Heidelberg, Germany, Molecular Epidemiology Group, C080, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Anders Kvist
- Division of Oncology, Department of Clinical Sciences
| | - Hans Ehrencrona
- Department of Clinical Genetics, Laboratory Medicine, Office for Medical Services and Department of Clinical Genetics, Lund University, Lund, Sweden
| | - Sylvie Mazoyer
- Cancer Research Centre of Lyon, CNRS UMR5286, INSERM U1052, Université Claude Bernard Lyon 1, Centre Léon Bérard, Lyon, France
| | - Sara Pizzamiglio
- Unit of Medical Statistics, Biometry and Bioinformatics, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Paolo Verderio
- Unit of Medical Statistics, Biometry and Bioinformatics, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| | - Jordi Surralles
- Genome Instability and DNA Repair Group, Department of Genetics and Microbiology, Universitat Autònoma de Barcelona and Center for Biomedical Network Research on Rare Diseases (CIBERER), Barcelona, Spain
| | - Peter K Rogan
- Department of Biochemistry, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada
| | - Paolo Radice
- IFOM, the FIRC Institute of Molecular Oncology, Milan, Italy, Unit of Molecular Bases of Genetic Risk and Genetic Testing, Department of Preventive and Predictive Medicine
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Kato Y, Alavattam KG, Sin HS, Meetei AR, Pang Q, Andreassen PR, Namekawa SH. FANCB is essential in the male germline and regulates H3K9 methylation on the sex chromosomes during meiosis. Hum Mol Genet 2015; 24:5234-49. [PMID: 26123487 DOI: 10.1093/hmg/ddv244] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 06/22/2015] [Indexed: 11/13/2022] Open
Abstract
Fanconi anemia (FA) is a recessive X-linked and autosomal genetic disease associated with bone marrow failure and increased cancer, as well as severe germline defects such as hypogonadism and germ cell depletion. Although deficiencies in FA factors are commonly associated with germ cell defects, it remains unknown whether the FA pathway is involved in unique epigenetic events in germ cells. In this study, we generated Fancb mutant mice, the first mouse model of X-linked FA, and identified a novel function of the FA pathway in epigenetic regulation during mammalian gametogenesis. Fancb mutant mice were infertile and exhibited primordial germ cell (PGC) defects during embryogenesis. Further, Fancb mutation resulted in the reduction of undifferentiated spermatogonia in spermatogenesis, suggesting that FANCB regulates the maintenance of undifferentiated spermatogonia. Additionally, based on functional studies, we dissected the pathway in which FANCB functions during meiosis. The localization of FANCB on sex chromosomes is dependent on MDC1, a binding partner of H2AX phosphorylated at serine 139 (γH2AX), which initiates chromosome-wide silencing. Also, FANCB is required for FANCD2 localization during meiosis, suggesting that the role of FANCB in the activation of the FA pathway is common to both meiosis and somatic DNA damage responses. H3K9me2, a silent epigenetic mark, was decreased on sex chromosomes, whereas H3K9me3 was increased on sex chromosomes in Fancb mutant spermatocytes. Taken together, these results indicate that FANCB functions at critical stages of germ cell development and reveal a novel function of the FA pathway in the regulation of H3K9 methylation in the germline.
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Affiliation(s)
- Yasuko Kato
- Division of Reproductive Sciences, Division of Developmental Biology, Perinatal Institute, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Kris G Alavattam
- Division of Reproductive Sciences, Division of Developmental Biology, Perinatal Institute, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Ho-Su Sin
- Division of Reproductive Sciences, Division of Developmental Biology, Perinatal Institute, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Amom Ruhikanta Meetei
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA and Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Qishen Pang
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA and Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Paul R Andreassen
- Division of Experimental Hematology and Cancer Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA and Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
| | - Satoshi H Namekawa
- Division of Reproductive Sciences, Division of Developmental Biology, Perinatal Institute, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH 4929, USA
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Zhang T, Wilson AF, Mahmood Ali A, Namekawa SH, Andreassen PR, Ruhikanta Meetei A, Pang Q. Loss of Faap20 Causes Hematopoietic Stem and Progenitor Cell Depletion in Mice Under Genotoxic Stress. Stem Cells 2015; 33:2320-30. [PMID: 25917546 DOI: 10.1002/stem.2048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 03/11/2015] [Indexed: 11/09/2022]
Abstract
20-kDa FANCA-associated protein (FAAP20) is a recently identified protein that associates with the Fanconi anemia (FA) core complex component, FANCA. FAAP20 contains a conserved ubiquitin-binding zinc-finger domain and plays critical roles in the FA-BRCA pathway of DNA repair and genome maintenance. The function of FAAP20 in animals has not been explored. Here, we report that deletion of Faap20 in mice led to a mild FA-like phenotype with defects in the reproductive and hematopoietic systems. Specifically, hematopoietic stem and progenitor cells (HSPCs) from Faap20(-) (/) (-) mice showed defects in long-term multilineage reconstitution in lethally irradiated recipient mice, with milder phenotype as compared to HSPCs from Fanca(-) (/) (-) or Fancc(-) (/) (-) mice. Faap20(-) (/) (-) mice are susceptible to mitomycin C (MMC)-induced pancytopenia. That is, acute MMC stress induced a significant progenitor loss especially the erythroid progenitors and megakaryocyte-erythrocyte progenitors in Faap20(-) (/) (-) mice. Furthermore, Faap20(-) (/) (-) HSPCs displayed aberrant cell cycle pattern during chronic MMC treatment. Finally, using Faap20(-) (/) (-) Fanca(-) (/) (-) double-knockout mice, we demonstrated a possible dominant effect of FANCA in the interaction between FAAP20 and FANCA. This novel Faap20 mouse model may be valuable in studying the regulation of the FA pathway during bone marrow failure progress in FA patients.
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Affiliation(s)
| | | | | | - Satoshi H Namekawa
- Division of Reproductive Sciences, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | | | | | - Qishen Pang
- Division of Experimental Hematology and Cancer Biology
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Exome sequencing identifies FANCM as a susceptibility gene for triple-negative breast cancer. Proc Natl Acad Sci U S A 2014; 111:15172-7. [PMID: 25288723 DOI: 10.1073/pnas.1407909111] [Citation(s) in RCA: 138] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Inherited predisposition to breast cancer is known to be caused by loss-of-function mutations in BRCA1, BRCA2, PALB2, CHEK2, and other genes involved in DNA repair. However, most families severely affected by breast cancer do not harbor mutations in any of these genes. In Finland, founder mutations have been observed in each of these genes, suggesting that the Finnish population may be an excellent resource for the identification of other such genes. To this end, we carried out exome sequencing of constitutional genomic DNA from 24 breast cancer patients from 11 Finnish breast cancer families. From all rare damaging variants, 22 variants in 21 DNA repair genes were genotyped in 3,166 breast cancer patients, 569 ovarian cancer patients, and 2,090 controls, all from the Helsinki or Tampere regions of Finland. In Fanconi anemia complementation gene M (FANCM), nonsense mutation c.5101C>T (p.Q1701X) was significantly more frequent among breast cancer patients than among controls [odds ratio (OR) = 1.86, 95% CI = 1.26-2.75; P = 0.0018], with particular enrichment among patients with triple-negative breast cancer (TNBC; OR = 3.56, 95% CI = 1.81-6.98, P = 0.0002). In the Helsinki and Tampere regions, respectively, carrier frequencies of FANCM p.Q1701X were 2.9% and 4.0% of breast cancer patients, 5.6% and 6.6% of TNBC patients, 2.2% of ovarian cancer patients (from Helsinki), and 1.4% and 2.5% of controls. These findings identify FANCM as a breast cancer susceptibility gene, mutations in which confer a particularly strong predisposition for TNBC.
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Drosophila FANCM helicase prevents spontaneous mitotic crossovers generated by the MUS81 and SLX1 nucleases. Genetics 2014; 198:935-45. [PMID: 25205745 DOI: 10.1534/genetics.114.168096] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Several helicases function during repair of double-strand breaks and handling of blocked or stalled replication forks to promote pathways that prevent formation of crossovers. Among these are the Bloom syndrome helicase BLM and the Fanconi anemia group M (FANCM) helicase. To better understand functions of these helicases, we compared phenotypes of Drosophila melanogaster Blm and Fancm mutants. As previously reported for BLM, FANCM has roles in responding to several types of DNA damage in preventing mitotic and meiotic crossovers and in promoting the synthesis-dependent strand annealing pathway for repair of a double-strand gap. In most assays, the phenotype of Fancm mutants is less severe than that of Blm mutants, and the phenotype of Blm Fancm double mutants is more severe than either single mutant, indicating both overlapping and unique functions. It is thought that mitotic crossovers arise when structure-selective nucleases cleave DNA intermediates that would normally be unwound or disassembled by these helicases. When BLM is absent, three nucleases believed to function as Holliday junction resolvases--MUS81-MMS4, MUS312-SLX1, and GEN--become essential. In contrast, no single resolvase is essential in mutants lacking FANCM, although simultaneous loss of GEN and either of the others is lethal in Fancm mutants. Since Fancm mutants can tolerate loss of a single resolvase, we were able to show that spontaneous mitotic crossovers that occur when FANCM is missing are dependent on MUS312 and either MUS81 or SLX1.
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68
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Emerging roles for centromere-associated proteins in DNA repair and genetic recombination. Biochem Soc Trans 2014; 41:1726-30. [PMID: 24256282 DOI: 10.1042/bst20130200] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Centromere proteins CENP-S and CENP-X are members of the constitutive centromere-associated network, which is a conserved group of proteins that are needed for the assembly and function of kinetochores at centromeres. Intriguingly CENP-S and CENP-X have alter egos going by the names of MHF1 (FANCM-associated histone-fold protein 1) and MHF2 respectively. In this guise they function with a DNA translocase called FANCM (Fanconi's anemia complementation group M) to promote DNA repair and homologous recombination. In the present review we discuss current knowledge of the biological roles of CENP-S and CENP-X and how their dual existence may be a common feature of CCAN (constitutive centromere-associated network) proteins.
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Larin M, Gallo D, Tamblyn L, Yang J, Liao H, Sabat N, Brown GW, McPherson JP. Fanconi anemia signaling and Mus81 cooperate to safeguard development and crosslink repair. Nucleic Acids Res 2014; 42:9807-20. [PMID: 25056314 PMCID: PMC4150781 DOI: 10.1093/nar/gku676] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Individuals with Fanconi anemia (FA) are susceptible to bone marrow failure, congenital abnormalities, cancer predisposition and exhibit defective DNA crosslink repair. The relationship of this repair defect to disease traits remains unclear, given that crosslink sensitivity is recapitulated in FA mouse models without most of the other disease-related features. Mice deficient in Mus81 are also defective in crosslink repair, yet MUS81 mutations have not been linked to FA. Using mice deficient in both Mus81 and the FA pathway protein FancC, we show both proteins cooperate in parallel pathways, as concomitant loss of FancC and Mus81 triggered cell-type-specific proliferation arrest, apoptosis and DNA damage accumulation in utero. Mice deficient in both FancC and Mus81 that survived to birth exhibited growth defects and an increased incidence of congenital abnormalities. This cooperativity of FancC and Mus81 in developmental outcome was also mirrored in response to crosslink damage and chromosomal integrity. Thus, our findings reveal that both pathways safeguard against DNA damage from exceeding a critical threshold that triggers proliferation arrest and apoptosis, leading to compromised in utero development.
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Affiliation(s)
- Meghan Larin
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada
| | - David Gallo
- Department of Biochemistry, Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, M5S 3E1, Canada
| | - Laura Tamblyn
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada
| | - Jay Yang
- Department of Biochemistry, Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, M5S 3E1, Canada
| | - Hudson Liao
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada
| | - Nestor Sabat
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada
| | - Grant W Brown
- Department of Biochemistry, Terrence Donnelly Center for Cellular and Biomolecular Research, University of Toronto, Toronto, M5S 3E1, Canada
| | - J Peter McPherson
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, M5S 1A8, Canada
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Luo Y, Hartford SA, Zeng R, Southard TL, Shima N, Schimenti JC. Hypersensitivity of primordial germ cells to compromised replication-associated DNA repair involves ATM-p53-p21 signaling. PLoS Genet 2014; 10:e1004471. [PMID: 25010009 PMCID: PMC4091704 DOI: 10.1371/journal.pgen.1004471] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 05/14/2014] [Indexed: 01/12/2023] Open
Abstract
Genome maintenance in germ cells is critical for fertility and the stable propagation of species. While mechanisms of meiotic DNA repair and chromosome behavior are well-characterized, the same is not true for primordial germ cells (PGCs), which arise and propagate during very early stages of mammalian development. Fanconi anemia (FA), a genomic instability syndrome that includes hypogonadism and testicular failure phenotypes, is caused by mutations in genes encoding a complex of proteins involved in repair of DNA lesions associated with DNA replication. The signaling mechanisms underlying hypogonadism and testicular failure in FA patients or mouse models are unknown. We conducted genetic studies to show that hypogonadism of Fancm mutant mice is a result of reduced proliferation, but not apoptosis, of PGCs, resulting in reduced germ cells in neonates of both sexes. Progressive loss of germ cells in adult males also occurs, overlaid with an elevated level of meiotic DNA damage. Genetic studies indicated that ATM-p53-p21 signaling is partially responsible for the germ cell deficiency. The precursors to sperm and eggs begin are a group of <100 cells in the embryo, called primordial germ cells (PGCs). They migrate in the primitive embryo to the location of the future gonads, then undergo a rapid proliferation over the next few days to a population of many thousands. Because these cells contain the precious genetic information for our offspring, and the DNA replication associated with rapid PGC proliferation is subject to spontaneous errors, mechanisms exist to avoid propagation of mutations. A manifestation of this is the high sensitivity of PGCs to genetic perturbations affecting DNA repair. We studied mice defective for a gene called Fanconi anemia M (Fancm) that is important for repair of DNA damage that occurs during replication. Although it is expressed in all tissues, only the PGCs are affected in mutants, and are reduced in number. We find that PGCs lacking Fancm respond by slowing cell division, and identified the genetic pathway responsible for this protective response.
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Affiliation(s)
- Yunhai Luo
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
| | - Suzanne A Hartford
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
| | - Ruizhu Zeng
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
| | - Teresa L Southard
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
| | - Naoko Shima
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
| | - John C Schimenti
- Department of Biomedical Sciences, Cornell University, Ithaca, New York, United States of America
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71
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Walden H, Deans AJ. The Fanconi anemia DNA repair pathway: structural and functional insights into a complex disorder. Annu Rev Biophys 2014; 43:257-78. [PMID: 24773018 DOI: 10.1146/annurev-biophys-051013-022737] [Citation(s) in RCA: 162] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mutations in any of at least sixteen FANC genes (FANCA-Q) cause Fanconi anemia, a disorder characterized by sensitivity to DNA interstrand crosslinking agents. The clinical features of cytopenia, developmental defects, and tumor predisposition are similar in each group, suggesting that the gene products participate in a common pathway. The Fanconi anemia DNA repair pathway consists of an anchor complex that recognizes damage caused by interstrand crosslinks, a multisubunit ubiquitin ligase that monoubiquitinates two substrates, and several downstream repair proteins including nucleases and homologous recombination enzymes. We review progress in the use of structural and biochemical approaches to understanding how each FANC protein functions in this pathway.
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Affiliation(s)
- Helen Walden
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom;
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72
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Benitez A, Yuan F, Nakajima S, Wei L, Qian L, Myers R, Hu JJ, Lan L, Zhang Y. Damage-dependent regulation of MUS81-EME1 by Fanconi anemia complementation group A protein. Nucleic Acids Res 2013; 42:1671-83. [PMID: 24170812 PMCID: PMC3919598 DOI: 10.1093/nar/gkt975] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
MUS81-EME1 is a DNA endonuclease involved in replication-coupled repair of DNA interstrand cross-links (ICLs). A prevalent hypothetical role of MUS81-EME1 in ICL repair is to unhook the damage by incising the leading strand at the 3′ side of an ICL lesion. In this study, we report that purified MUS81-EME1 incises DNA at the 5′ side of a psoralen ICL residing in fork structures. Intriguingly, ICL repair protein, Fanconi anemia complementation group A protein (FANCA), greatly enhances MUS81-EME1-mediated ICL incision. On the contrary, FANCA exhibits a two-phase incision regulation when DNA is undamaged or the damage affects only one DNA strand. Studies using truncated FANCA proteins indicate that both the N- and C-moieties of the protein are required for the incision regulation. Using laser-induced psoralen ICL formation in cells, we find that FANCA interacts with and recruits MUS81 to ICL lesions. This report clarifies the incision specificity of MUS81-EME1 on ICL damage and establishes that FANCA regulates the incision activity of MUS81-EME1 in a damage-dependent manner.
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Affiliation(s)
- Anaid Benitez
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Fenghua Yuan
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Satoshi Nakajima
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Leizhen Wei
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Liangyue Qian
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Richard Myers
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Jennifer J. Hu
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Li Lan
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Yanbin Zhang
- Department of Biochemistry & Molecular Biology, University of Miami Miller School of Medicine, Miami, FL 33136, USA, Department of Microbiology & Molecular Genetics, University of Pittsburgh, Pittsburgh, PA 15213, USA and Department of Epidemiology & Public Health, University of Miami Miller School of Medicine, Miami, FL 33136, USA
- *To whom correspondence should be addressed. Tel: +1 305 243 9237; Fax: +1 305 243 3955;
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73
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Huang J, Liu S, Bellani MA, Thazhathveetil AK, Ling C, de Winter JP, Wang Y, Wang W, Seidman MM. The DNA translocase FANCM/MHF promotes replication traverse of DNA interstrand crosslinks. Mol Cell 2013; 52:434-46. [PMID: 24207054 DOI: 10.1016/j.molcel.2013.09.021] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 09/09/2013] [Accepted: 09/19/2013] [Indexed: 10/26/2022]
Abstract
The replicative machinery encounters many impediments, some of which can be overcome by lesion bypass or replication restart pathways, leaving repair for a later time. However, interstrand crosslinks (ICLs), which preclude DNA unwinding, are considered absolute blocks to replication. Current models suggest that fork collisions, either from one or both sides of an ICL, initiate repair processes required for resumption of replication. To test these proposals, we developed a single-molecule technique for visualizing encounters of replication forks with ICLs as they occur in living cells. Surprisingly, the most frequent patterns were consistent with replication traverse of an ICL, without lesion repair. The traverse frequency was strongly reduced by inactivation of the translocase and DNA binding activities of the FANCM/MHF complex. The results indicate that translocase-based mechanisms enable DNA synthesis to continue past ICLs and that these lesions are not always absolute blocks to replication.
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Affiliation(s)
- Jing Huang
- Laboratory of Molecular Gerontology, National Institute on Aging, National Institutes of Health, 251 Bayview Boulevard, Baltimore, MD 21224, USA
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74
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Lestini R, Laptenok SP, Kühn J, Hink MA, Schanne-Klein MC, Liebl U, Myllykallio H. Intracellular dynamics of archaeal FANCM homologue Hef in response to halted DNA replication. Nucleic Acids Res 2013; 41:10358-70. [PMID: 24049073 PMCID: PMC3905845 DOI: 10.1093/nar/gkt816] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Hef is an archaeal member of the DNA repair endonuclease XPF (XPF)/Crossover junction endonuclease MUS81 (MUS81)/Fanconi anemia, complementation group M (FANCM) protein family that in eukaryotes participates in the restart of stalled DNA replication forks. To investigate the physiological roles of Hef in maintaining genome stability in living archaeal cells, we studied the localization of Hef–green fluorescent protein fusions by fluorescence microscopy. Our studies revealed that Haloferax volcanii Hef proteins formed specific localization foci under regular growth conditions, the number of which specifically increased in response to replication arrest. Purification of the full-length Hef protein from its native host revealed that it forms a stable homodimer in solution, with a peculiar elongated configuration. Altogether our data indicate that the shape of Hef, significant physicochemical constraints and/or interactions with DNA limit the apparent cytosolic diffusion of halophilic DNA replication/repair complexes, and demonstrate that Hef proteins are dynamically recruited to archaeal eukaryotic-like chromatin to counteract DNA replication stress. We suggest that the evolutionary conserved function of Hef/FANCM proteins is to enhance replication fork stability by directly interacting with collapsed replication forks.
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Affiliation(s)
- Roxane Lestini
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS UMR7645-INSERM U696, 91128 Palaiseau Cedex, France and Section of Molecular Cytology, Swammerdam Institute for Life Sciences, van Leeuwenhoek Centre for Advanced Microscopy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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75
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Bhattacharjee S, Osman F, Feeney L, Lorenz A, Bryer C, Whitby MC. MHF1-2/CENP-S-X performs distinct roles in centromere metabolism and genetic recombination. Open Biol 2013; 3:130102. [PMID: 24026537 PMCID: PMC3787749 DOI: 10.1098/rsob.130102] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The histone-fold proteins Mhf1/CENP-S and Mhf2/CENP-X perform two important functions in vertebrate cells. First, they are components of the constitutive centromere-associated network, aiding kinetochore assembly and function. Second, they work with the FANCM DNA translocase to promote DNA repair. However, it has been unclear whether there is crosstalk between these roles. We show that Mhf1 and Mhf2 in fission yeast, as in vertebrates, serve a dual function, aiding DNA repair/recombination and localizing to centromeres to promote chromosome segregation. Importantly, these functions are distinct, with the former being dependent on their interaction with the FANCM orthologue Fml1 and the latter not. Together with Fml1, they play a second role in aiding chromosome segregation by processing sister chromatid junctions. However, a failure of this activity does not manifest dramatically increased levels of chromosome missegregation due to the Mus81–Eme1 endonuclease, which acts as a failsafe to resolve DNA junctions before the end of mitosis.
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Affiliation(s)
- Sonali Bhattacharjee
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
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76
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Luebben SW, Kawabata T, Akre MK, Lee WL, Johnson CS, O'Sullivan MG, Shima N. Helq acts in parallel to Fancc to suppress replication-associated genome instability. Nucleic Acids Res 2013; 41:10283-97. [PMID: 24005041 PMCID: PMC3905894 DOI: 10.1093/nar/gkt676] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
HELQ is a superfamily 2 DNA helicase found in archaea and metazoans. It has been implicated in processing stalled replication forks and in repairing DNA double-strand breaks and inter-strand crosslinks. Though previous studies have suggested the possibility that HELQ is involved in the Fanconi anemia (FA) pathway, a dominant mechanism for inter-strand crosslink repair in vertebrates, this connection remains elusive. Here, we investigated this question in mice using the Helqgt and Fancc− strains. Compared with Fancc−/− mice lacking FANCC, a component of the FA core complex, Helqgt/gt mice exhibited a mild of form of FA-like phenotypes including hypogonadism and cellular sensitivity to the crosslinker mitomycin C. However, unlike Fancc−/− primary fibroblasts, Helqgt/gt cells had intact FANCD2 mono-ubiquitination and focus formation. Notably, for all traits examined, Helq was non-epistatic with Fancc, as Helqgt/gt;Fancc−/− double mutants displayed significantly worsened phenotypes than either single mutant. Importantly, this was most noticeable for the suppression of spontaneous chromosome instability such as micronuclei and 53BP1 nuclear bodies, known consequences of persistently stalled replication forks. These findings suggest that mammalian HELQ contributes to genome stability in unchallenged conditions through a mechanism distinct from the function of FANCC.
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Affiliation(s)
- Spencer W Luebben
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455, USA, Molecular, Cellular, Developmental Biology and Genetics Graduate Program, University of Minnesota, Minneapolis, MN 55455, USA, Masonic Cancer Center, Minneapolis, MN 55455, USA and College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108, USA
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77
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Smith CG, Naven M, Harris R, Colley J, West H, Li N, Liu Y, Adams R, Maughan TS, Nichols L, Kaplan R, Wagner MJ, McLeod HL, Cheadle JP. Exome resequencing identifies potential tumor-suppressor genes that predispose to colorectal cancer. Hum Mutat 2013; 34:1026-34. [PMID: 23585368 DOI: 10.1002/humu.22333] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 03/26/2013] [Indexed: 01/07/2023]
Abstract
Inherited factors account for around one third of all colorectal cancers (CRCs) and include rare high penetrance mutations in APC, MSH2, MSH6, and POLE. Here, we sought novel tumor-suppressor genes that predispose to CRC by exome resequencing 50 sporadic patients with advanced CRC (18 diagnosed ≤35 years of age) at a mean coverage of 30×. To help identify potentially pathogenic alleles, we initially sought rare or novel germline truncating mutations in 1,138 genes that were likely to play a role in colorectal tumorigenesis. In total, 32 such mutations were identified and confirmed, and included an insertion in APC and a deletion in POLE, thereby validating our approach for identifying disease alleles. We sought somatic mutations in the corresponding genes in the CRCs of the patients harboring the germline lesions and found biallelic inactivation of FANCM, LAMB4, PTCHD3, LAMC3, and TREX2, potentially implicating these genes as tumor suppressors. We also identified a patient who carried a germline truncating mutation in NOTCH3, part of the Notch signaling cascade that maintains intestinal homeostasis. Our whole exome analyses provided further gene lists to facilitate the identification of potential predisposition alleles.
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Affiliation(s)
- Christopher G Smith
- Institute of Cancer and Genetics, School of Medicine, Cardiff University, Heath Park, Cardiff, UK
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78
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Bakker ST, de Winter JP, te Riele H. Learning from a paradox: recent insights into Fanconi anaemia through studying mouse models. Dis Model Mech 2013; 6:40-7. [PMID: 23268537 PMCID: PMC3529337 DOI: 10.1242/dmm.009795] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Fanconi anaemia (FA) is a rare autosomal recessive or X-linked inherited disease characterised by an increased incidence of bone marrow failure (BMF), haematological malignancies and solid tumours. Cells from individuals with FA show a pronounced sensitivity to DNA interstrand crosslink (ICL)-inducing agents, which manifests as G2-M arrest, chromosomal aberrations and reduced cellular survival. To date, mutations in at least 15 different genes have been identified that cause FA; the products of all of these genes are thought to function together in the FA pathway, which is essential for ICL repair. Rapidly following the discovery of FA genes, mutant mice were generated to study the disease and the affected pathway. These mutant mice all show the characteristic cellular ICL-inducing agent sensitivity, but only partially recapitulate the developmental abnormalities, anaemia and cancer predisposition seen in individuals with FA. Therefore, the usefulness of modelling FA in mice has been questioned. In this Review, we argue that such scepticism is unjustified. We outline that haematopoietic defects and cancer predisposition are manifestations of FA gene defects in mice, albeit only in certain genetic backgrounds and under certain conditions. Most importantly, recent work has shown that developmental defects in FA mice also arise with concomitant inactivation of acetaldehyde metabolism, giving a strong clue about the nature of the endogenous lesion that must be repaired by the functional FA pathway. This body of work provides an excellent example of a paradox in FA research: that the dissimilarity, rather than the similarity, between mice and humans can provide insight into human disease. We expect that further study of mouse models of FA will help to uncover the mechanistic background of FA, ultimately leading to better treatment options for the disease.
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Affiliation(s)
- Sietske T Bakker
- Division of Biological Stress Response, Netherlands Cancer Institute, Plesmanlaan 121, NL-1066 CX Amsterdam, The Netherlands
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79
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Tomida J, Itaya A, Shigechi T, Unno J, Uchida E, Ikura M, Masuda Y, Matsuda S, Adachi J, Kobayashi M, Meetei AR, Maehara Y, Yamamoto KI, Kamiya K, Matsuura A, Matsuda T, Ikura T, Ishiai M, Takata M. A novel interplay between the Fanconi anemia core complex and ATR-ATRIP kinase during DNA cross-link repair. Nucleic Acids Res 2013; 41:6930-41. [PMID: 23723247 PMCID: PMC3737553 DOI: 10.1093/nar/gkt467] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
When DNA replication is stalled at sites of DNA damage, a cascade of responses is activated in the cell to halt cell cycle progression and promote DNA repair. A pathway initiated by the kinase Ataxia teleangiectasia and Rad3 related (ATR) and its partner ATR interacting protein (ATRIP) plays an important role in this response. The Fanconi anemia (FA) pathway is also activated following genomic stress, and defects in this pathway cause a cancer-prone hematologic disorder in humans. Little is known about how these two pathways are coordinated. We report here that following cellular exposure to DNA cross-linking damage, the FA core complex enhances binding and localization of ATRIP within damaged chromatin. In cells lacking the core complex, ATR-mediated phosphorylation of two functional response targets, ATRIP and FANCI, is defective. We also provide evidence that the canonical ATR activation pathway involving RAD17 and TOPBP1 is largely dispensable for the FA pathway activation. Indeed DT40 mutant cells lacking both RAD17 and FANCD2 were synergistically more sensitive to cisplatin compared with either single mutant. Collectively, these data reveal new aspects of the interplay between regulation of ATR-ATRIP kinase and activation of the FA pathway.
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Affiliation(s)
- Junya Tomida
- Department of Late Effects Studies, Laboratory of DNA Damage Signaling, Kyoto University, Kyoto 606-8501, Japan, Japan Society for the Promotion of Science (JSPS), Tokyo 102-0083, Japan
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80
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Wienk H, Slootweg JC, Speerstra S, Kaptein R, Boelens R, Folkers GE. The Fanconi anemia associated protein FAAP24 uses two substrate specific binding surfaces for DNA recognition. Nucleic Acids Res 2013; 41:6739-49. [PMID: 23661679 PMCID: PMC3711432 DOI: 10.1093/nar/gkt354] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
To maintain the integrity of the genome, multiple DNA repair systems exist to repair damaged DNA. Recognition of altered DNA, including bulky adducts, pyrimidine dimers and interstrand crosslinks (ICL), partially depends on proteins containing helix-hairpin-helix (HhH) domains. To understand how ICL is specifically recognized by the Fanconi anemia proteins FANCM and FAAP24, we determined the structure of the HhH domain of FAAP24. Although it resembles other HhH domains, the FAAP24 domain contains a canonical hairpin motif followed by distorted motif. The HhH domain can bind various DNA substrates; using nuclear magnetic resonance titration experiments, we demonstrate that the canonical HhH motif is required for double-stranded DNA (dsDNA) binding, whereas the unstructured N-terminus can interact with single-stranded DNA. Both DNA binding surfaces are used for binding to ICL-like single/double-strand junction-containing DNA substrates. A structural model for FAAP24 bound to dsDNA has been made based on homology with the translesion polymerase iota. Site-directed mutagenesis, sequence conservation and charge distribution support the dsDNA-binding model. Analogous to other HhH domain-containing proteins, we suggest that multiple FAAP24 regions together contribute to binding to single/double-strand junction, which could contribute to specificity in ICL DNA recognition.
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Affiliation(s)
- Hans Wienk
- Bijvoet Center For Biomolecular Research, NMR Spectroscopy, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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81
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FANCM and FAAP24 maintain genome stability via cooperative as well as unique functions. Mol Cell 2013; 49:997-1009. [PMID: 23333308 DOI: 10.1016/j.molcel.2012.12.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 10/19/2012] [Accepted: 12/13/2012] [Indexed: 12/29/2022]
Abstract
The DNA remodeling enzyme FANCM and its DNA-binding partner, FAAP24, constitute a complex involved in the activation of Fanconi anemia (FA) DNA damage response mechanism, but neither gene has distinct patient mutants. In this study, we created isogenic models for both FANCM and FAAP24 and investigated their integrated functions in DNA damage response. We found that FANCM and FAAP24 coordinately facilitate FA pathway activation and suppress sister chromatid exchange. Importantly, we show that FANCM and FAAP24 possess nonoverlapping functions such that FAAP24 promotes ATR-mediated checkpoint activation particularly in response to DNA crosslinking agents, whereas FANCM participates in recombination-independent interstrand crosslink repair by facilitating recruitment of lesion incision activities, which requires its translocase activity. Our data suggest that FANCM and FAAP24 play multiple, while not fully epistatic, roles in maintaining genomic integrity.
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82
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Duquette ML, Zhu Q, Taylor ER, Tsay AJ, Shi LZ, Berns MW, McGowan CH. CtIP is required to initiate replication-dependent interstrand crosslink repair. PLoS Genet 2012; 8:e1003050. [PMID: 23144634 PMCID: PMC3493458 DOI: 10.1371/journal.pgen.1003050] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 09/12/2012] [Indexed: 11/26/2022] Open
Abstract
DNA interstrand crosslinks (ICLs) are toxic lesions that block the progression of replication and transcription. CtIP is a conserved DNA repair protein that facilitates DNA end resection in the double-strand break (DSB) repair pathway. Here we show that CtIP plays a critical role during initiation of ICL processing in replicating human cells that is distinct from its role in DSB repair. CtIP depletion sensitizes human cells to ICL inducing agents and significantly impairs the accumulation of DNA damage response proteins RPA, ATR, FANCD2, γH2AX, and phosphorylated ATM at sites of laser generated ICLs. In contrast, the appearance of γH2AX and phosphorylated ATM at sites of laser generated double strand breaks (DSBs) is CtIP-independent. We present a model in which CtIP functions early in ICL repair in a BRCA1– and FANCM–dependent manner prior to generation of DSB repair intermediates. One of the most lethal forms of DNA damage is the interstrand crosslink (ICL). An ICL is a chemical bridge between two nucleotides on complementary strands of DNA. An unrepaired ICL is toxic because it poses an unsurpassable block to DNA replication and transcription. Certain forms of cancer treatment exploit the toxicity of ICL generating agents to target rapidly dividing cells. Sensitivity to crosslinking agents is a defining characteristic of Fanconi Anemia (FA), a hereditary syndrome characterized by an increased risk in cancer development and hematopoietic abnormalities frequently resulting in bone marrow failure. The mechanism underlying ICL repair is important to human health; however, the sequence of molecular events governing ICL repair is poorly understood. Here we describe how the repair protein CtIP functions to initiate ICL repair in replicating cells in a manner distinct from its previously described role in other forms of DNA repair.
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Affiliation(s)
- Michelle L Duquette
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America.
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83
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Nandi S, Whitby MC. The ATPase activity of Fml1 is essential for its roles in homologous recombination and DNA repair. Nucleic Acids Res 2012; 40:9584-95. [PMID: 22844101 PMCID: PMC3479183 DOI: 10.1093/nar/gks715] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In fission yeast, the DNA helicase Fml1, which is an orthologue of human FANCM, is a key component of the machinery that drives and governs homologous recombination (HR). During the repair of DNA double-strand breaks by HR, it limits the occurrence of potentially deleterious crossover recombinants, whereas at stalled replication forks, it promotes HR to aid their recovery. Here, we have mutated conserved residues in Fml1's Walker A (K99R) and Walker B (D196N) motifs to determine whether its activities are dependent on its ability to hydrolyse ATP. Both Fml1(K99R) and Fml1(D196N) are proficient for DNA binding but totally deficient in DNA unwinding and ATP hydrolysis. In vivo both mutants exhibit a similar reduction in recombination at blocked replication forks as a fml1Δ mutant indicating that Fml1's motor activity, fuelled by ATP hydrolysis, is essential for its pro-recombinogenic role. Intriguingly, both fml1(K99R) and fml1(D196N) mutants exhibit greater sensitivity to genotoxins and higher levels of crossing over during DSB repair than a fml1Δ strain. These data suggest that without its motor activity, the binding of Fml1 to its DNA substrate can impede alternative mechanisms of repair and crossover avoidance.
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Affiliation(s)
- Saikat Nandi
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
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84
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Bartnikas TB, Parker CC, Cheng R, Campagna DR, Lim JE, Palmer AA, Fleming MD. QTLs for murine red blood cell parameters in LG/J and SM/J F(2) and advanced intercross lines. Mamm Genome 2012; 23:356-66. [PMID: 22322356 PMCID: PMC3358495 DOI: 10.1007/s00335-012-9393-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 01/11/2012] [Indexed: 10/14/2022]
Abstract
Red blood cells are essential for oxygen transport and other physiologic processes. Red cell characteristics are typically determined by complete blood counts which measure parameters such as hemoglobin levels and mean corpuscular volumes; these parameters reflect the quality and quantity of red cells in the circulation at any particular moment. To identify the genetic determinants of red cell parameters, we performed genome-wide association analysis on LG/J×SM/J F2 and F34 advanced intercross lines using single nucleotide polymorphism genotyping and a novel algorithm for mapping in the combined populations. We identified significant quantitative trait loci for red cell parameters on chromosomes 6, 7, 8, 10, 12, and 17; our use of advanced intercross lines reduced the quantitative trait loci interval width from 1.6- to 9.4-fold. Using the genomic sequences of LG/J and SM/J mice, we identified nonsynonymous coding single nucleotide polymorphisms in candidate genes residing within quantitative trait loci and performed sequence alignments and molecular modeling to gauge the potential impact of amino acid substitutions. These results should aid in the identification of genes critical for red cell physiology and metabolism and demonstrate the utility of advanced intercross lines in uncovering genetic determinants of inherited traits.
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Affiliation(s)
- Thomas B Bartnikas
- Department of Pathology, Children's Hospital, Enders 1110, 300 Longwood Avenue, Boston, MA 02115, USA.
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85
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Disrupted Signaling through the Fanconi Anemia Pathway Leads to Dysfunctional Hematopoietic Stem Cell Biology: Underlying Mechanisms and Potential Therapeutic Strategies. Anemia 2012; 2012:265790. [PMID: 22675615 PMCID: PMC3366203 DOI: 10.1155/2012/265790] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 03/13/2012] [Indexed: 12/31/2022] Open
Abstract
Fanconi anemia (FA) is the most common inherited bone marrow failure syndrome. FA patients suffer to varying degrees from a heterogeneous range of developmental defects and, in addition, have an increased likelihood of developing cancer. Almost all FA patients develop a severe, progressive bone marrow failure syndrome, which impacts upon the production of all hematopoietic lineages and, hence, is thought to be driven by a defect at the level of the hematopoietic stem cell (HSC). This hypothesis would also correlate with the very high incidence of MDS and AML that is observed in FA patients. In this paper, we discuss the evidence that supports the role of dysfunctional HSC biology in driving the etiology of the disease. Furthermore, we consider the different model systems currently available to study the biology of cells defective in the FA signaling pathway and how they are informative in terms of identifying the physiologic mediators of HSC depletion and dissecting their putative mechanism of action. Finally, we ask whether the insights gained using such disease models can be translated into potential novel therapeutic strategies for the treatment of the hematologic disorders in FA patients.
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86
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Kelsall IR, Langenick J, MacKay C, Patel KJ, Alpi AF. The Fanconi anaemia components UBE2T and FANCM are functionally linked to nucleotide excision repair. PLoS One 2012; 7:e36970. [PMID: 22615860 PMCID: PMC3352854 DOI: 10.1371/journal.pone.0036970] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2012] [Accepted: 04/10/2012] [Indexed: 11/24/2022] Open
Abstract
The many proteins that function in the Fanconi anaemia (FA) monoubiquitylation pathway initiate replicative DNA crosslink repair. However, it is not clear whether individual FA genes participate in DNA repair pathways other than homologous recombination and translesion bypass. Here we show that avian DT40 cell knockouts of two integral FA genes – UBE2T and FANCM are unexpectedly sensitive to UV-induced DNA damage. Comprehensive genetic dissection experiments indicate that both of these FA genes collaborate to promote nucleotide excision repair rather than translesion bypass to protect cells form UV genotoxicity. Furthermore, UBE2T deficiency impacts on the efficient removal of the UV-induced photolesion cyclobutane pyrimidine dimer. Therefore, this work reveals that the FA pathway shares two components with nucleotide excision repair, intimating not only crosstalk between the two major repair pathways, but also potentially identifying a UBE2T-mediated ubiquitin-signalling response pathway that contributes to nucleotide excision repair.
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Affiliation(s)
- Ian R. Kelsall
- Scottish Institute for Cell Signalling, University of Dundee, Dundee, United Kingdom
| | | | - Craig MacKay
- Scottish Institute for Cell Signalling, University of Dundee, Dundee, United Kingdom
| | - Ketan J. Patel
- MRC Laboratory of Molecular Biology, Cambridge, United Kingdom
| | - Arno F. Alpi
- Scottish Institute for Cell Signalling, University of Dundee, Dundee, United Kingdom
- * E-mail:
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87
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Blackford AN, Schwab RA, Nieminuszczy J, Deans AJ, West SC, Niedzwiedz W. The DNA translocase activity of FANCM protects stalled replication forks. Hum Mol Genet 2012; 21:2005-16. [PMID: 22279085 DOI: 10.1093/hmg/dds013] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
FANCM is the most highly conserved protein within the Fanconi anaemia (FA) tumour suppressor pathway. However, although FANCM contains a helicase domain with translocase activity, this is not required for its role in activating the FA pathway. Instead, we show here that FANCM translocaseactivity is essential for promoting replication fork stability. We demonstrate that cells expressing translocase-defective FANCM show altered global replication dynamics due to increased accumulation of stalled forks that subsequently degenerate into DNA double-strand breaks, leading to ATM activation, CTBP-interacting protein (CTIP)-dependent end resection and homologous recombination repair. Accordingly, abrogation of ATM or CTIP function in FANCM-deficient cells results in decreased cell survival. We also found that FANCM translocase activity protects cells from accumulating 53BP1-OPT domains, which mark lesions resulting from problems arising during replication. Taken together, these data show that FANCM plays an essential role in maintaining chromosomal integrity by promoting the recovery of stalled replication forks and hence preventing tumourigenesis.
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Affiliation(s)
- Andrew N Blackford
- Department of Oncology, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
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88
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Fanconi anemia (FA) binding protein FAAP20 stabilizes FA complementation group A (FANCA) and participates in interstrand cross-link repair. Proc Natl Acad Sci U S A 2012; 109:4491-6. [PMID: 22396592 DOI: 10.1073/pnas.1118720109] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The Fanconi anemia (FA) pathway participates in interstrand cross-link (ICL) repair and the maintenance of genomic stability. The FA core complex consists of eight FA proteins and two Fanconi anemia-associated proteins (FAAP24 and FAAP100). The FA core complex has ubiquitin ligase activity responsible for monoubiquitination of the FANCI-FANCD2 (ID) complex, which in turn initiates a cascade of biochemical events that allow processing and removal of cross-linked DNA and thereby promotes cell survival following DNA damage. Here, we report the identification of a unique component of the FA core complex, namely, FAAP20, which contains a RAD18-like ubiquitin-binding zinc-finger domain. Our data suggest that FAAP20 promotes the functional integrity of the FA core complex via its direct interaction with the FA gene product, FANCA. Indeed, somatic knockout cells devoid of FAAP20 displayed the hallmarks of FA cells, including hypersensitivity to DNA cross-linking agents, chromosome aberrations, and reduced FANCD2 monoubiquitination. Taking these data together, our study indicates that FAAP20 is an important player involved in the FA pathway.
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89
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Cabelof DC. Haploinsufficiency in mouse models of DNA repair deficiency: modifiers of penetrance. Cell Mol Life Sci 2012; 69:727-40. [PMID: 21952828 PMCID: PMC11114761 DOI: 10.1007/s00018-011-0839-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 08/08/2011] [Accepted: 09/15/2011] [Indexed: 11/24/2022]
Abstract
Mouse models of DNA repair deficiency are useful tools for determining susceptibility to disease. Cancer predisposition and premature aging are commonly impacted by deficiencies in DNA repair, presumably as a function of reduced genomic fitness. In this review, a comprehensive analysis of all DNA repair mutant mouse models has been completed in order to assess the importance of haploinsufficiency for these genes. This analysis brings to light a clear role for haploinsufficiency in disease predisposition. Unfortunately, much of the data on heterozygous models are buried or underinvestigated. In light of a better understanding that the role of DNA repair haploinsufficiency may play in penetrance of other oncogenic or disease causing factors, it may be in the interest of human health and disease prevention to further investigate the phenotypes in many of these mouse models.
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Affiliation(s)
- Diane C Cabelof
- Department of Nutrition and Food Science, Wayne State University, Detroit, MI 48201, USA.
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90
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Yuan F, Qian L, Zhao X, Liu JY, Song L, D'Urso G, Jain C, Zhang Y. Fanconi anemia complementation group A (FANCA) protein has intrinsic affinity for nucleic acids with preference for single-stranded forms. J Biol Chem 2011; 287:4800-7. [PMID: 22194614 DOI: 10.1074/jbc.m111.315366] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The Fanconi anemia complementation group A (FANCA) gene is one of 15 disease-causing genes and has been found to be mutated in ∼60% of Fanconi anemia patients. Using purified protein, we report that human FANCA has intrinsic affinity for nucleic acids. FANCA binds to both single-stranded (ssDNA) and double-stranded (dsDNA) DNAs; however, its affinity for ssDNA is significantly higher than for dsDNA in an electrophoretic mobility shift assay. FANCA also binds to RNA with an intriguingly higher affinity than its DNA counterpart. FANCA requires a certain length of nucleic acids for optimal binding. Using DNA and RNA ladders, we determined that the minimum number of nucleotides required for FANCA recognition is ∼30 for both DNA and RNA. By testing the affinity between FANCA and a variety of DNA structures, we found that a 5'-flap or 5'-tail on DNA facilitates its interaction with FANCA. A patient-derived FANCA truncation mutant (Q772X) has diminished affinity for both DNA and RNA. In contrast, the complementing C-terminal fragment of Q772X, C772-1455, retains the differentiated nucleic acid-binding activity (RNA > ssDNA > dsDNA), indicating that the nucleic acid-binding domain of FANCA is located primarily at its C terminus, where most disease-causing mutations are found.
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Affiliation(s)
- Fenghua Yuan
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, Florida 33136, USA
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91
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Huang M, Kennedy R, Ali AM, Moreau LA, Meetei AR, D’Andrea AD, Chen CC. Human MutS and FANCM complexes function as redundant DNA damage sensors in the Fanconi Anemia pathway. DNA Repair (Amst) 2011; 10:1203-12. [DOI: 10.1016/j.dnarep.2011.09.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 09/03/2011] [Accepted: 09/10/2011] [Indexed: 12/30/2022]
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92
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Bakker ST, van de Vrugt HJ, Visser JA, Delzenne-Goette E, van der Wal A, Berns MAD, van de Ven M, Oostra AB, de Vries S, Kramer P, Arwert F, van der Valk M, de Winter JP, te Riele H. Fancf-deficient mice are prone to develop ovarian tumours. J Pathol 2011; 226:28-39. [PMID: 21915857 DOI: 10.1002/path.2992] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/23/2011] [Accepted: 08/25/2011] [Indexed: 01/05/2023]
Abstract
Fanconi anaemia (FA) is a rare recessive disorder marked by developmental abnormalities, bone marrow failure, and a high risk for the development of leukaemia and solid tumours. The inactivation of FA genes, in particular FANCF, has also been documented in sporadic tumours in non-FA patients. To study whether there is a causal relationship between FA pathway defects and tumour development, we have generated a mouse model with a targeted disruption of the FA core complex gene Fancf. Fancf-deficient mouse embryonic fibroblasts displayed a phenotype typical for FA cells: they showed an aberrant response to DNA cross-linking agents as manifested by G(2) arrest, chromosomal aberrations, reduced survival, and an inability to monoubiquitinate FANCD2. Fancf homozygous mice were viable, born following a normal Mendelian distribution, and showed no growth retardation or developmental abnormalities. The gonads of Fancf mutant mice functioned abnormally, showing compromised follicle development and spermatogenesis as has been observed in other FA mouse models and in FA patients. In a cohort of Fancf-deficient mice, we observed decreased overall survival and increased tumour incidence. Notably, in seven female mice, six ovarian tumours developed: five granulosa cell tumours and one luteoma. One mouse had developed tumours in both ovaries. High-resolution array comparative genomic hybridization (aCGH) on these tumours suggests that the increased incidence of ovarian tumours correlates with the infertility in Fancf-deficient mice and the genomic instability characteristic of FA pathway deficiency.
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Affiliation(s)
- Sietske T Bakker
- Division of Molecular Biology, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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93
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Evidence for complete epistasis of null mutations in murine Fanconi anemia genes Fanca and Fancg. DNA Repair (Amst) 2011; 10:1252-61. [PMID: 22036606 DOI: 10.1016/j.dnarep.2011.09.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 09/02/2011] [Accepted: 09/26/2011] [Indexed: 11/21/2022]
Abstract
Fanconi anemia (FA) is a heritable disease characterized by bone marrow failure, congenital abnormalities, and cancer predisposition. The 15 identified FA genes operate in a molecular pathway to preserve genomic integrity. Within this pathway the FA core complex operates as an ubiquitin ligase that activates the complex of FANCD2 and FANCI to coordinate DNA repair. The FA core complex is formed by at least 12 proteins. However, only the FANCL subunit displays ubiquitin ligase activity. FANCA and FANCG are members of the FA core complex for which no other functions have been described than to participate in protein interactions. In this study we generated mice with combined null alleles for Fanca and Fancg to identify extended functions for these genes by characterizing the double mutant mice and cells. Double mutant a(-/-)/g(-/-) mice were born at near Mendelian frequencies without apparent developmental abnormalities. Histological analysis of a(-/-)/g(-/-) mice revealed a Leydig cell hyperplasia and frequent vacuolization of Sertoli cells in testes, while ovaries were depleted from developing follicles and displayed an interstitial cell hyperplasia. These gonadal aberrations were associated with a compromised fertility of a(-/-)/g(-/-) males and females. During the first year of life a(-/-)/g(-/-) did not develop malignancies or bone marrow failure. At the cellular level a(-/-)/g(-/-), Fanca(-/-), and Fancg(-/-) cells proved equally compromised in DNA crosslink and homology-directed repair. Overall the phenotype of a(-/-)/g(-/-) double knockout mice and cells appeared highly similar to the phenotype of Fanca or Fancg single knockouts. The lack of an augmented phenotype suggest that null mutations in Fanca or Fancg are fully epistatic, making additional important functions outside of the FA core complex highly unlikely.
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94
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Crossan GP, Patel KJ. The Fanconi anaemia pathway orchestrates incisions at sites of crosslinked DNA. J Pathol 2011; 226:326-37. [PMID: 21956823 DOI: 10.1002/path.3002] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 09/21/2011] [Accepted: 09/22/2011] [Indexed: 12/18/2022]
Abstract
Fanconi anaemia (FA) is a rare, autosomal recessive, genetically complex, DNA repair deficiency syndrome in man. Patients with FA exhibit a heterogeneous spectrum of clinical features. The most significant and consistent phenotypic characteristics are stem cell loss, causing progressive bone marrow failure and sterility, diverse developmental abnormalities and a profound predisposition to neoplasia. To date, 15 genes have been identified, biallelic disruption of any one of which results in this clinically defined syndrome. It is now apparent that all 15 gene products act in a common process to maintain genome stability. At the molecular level, a fundamental defect in DNA repair underlies this complex phenotype. Cells derived from FA patients spontaneously accumulate broken chromosomes and exhibit a marked sensitivity to DNA-damaging chemotherapeutic agents. Despite complementation analysis defining many components of the FA DNA repair pathway, no direct link to DNA metabolism was established until recently. First, it is now evident that the FA pathway is required to make incisions at the site of damaged DNA. Second, a specific component of the FA pathway has been identified that regulates nucleases previously implicated in DNA interstrand crosslink repair. Taken together, these data provide genetic and biochemical evidence that the FA pathway is a bona fide DNA repair pathway that directly mediates DNA repair transactions, thereby elucidating the specific molecular defect in human Fanconi anaemia.
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Affiliation(s)
- Gerry P Crossan
- MRC Laboratory of Molecular Biology, Division of Protein and Nucleic Acid Chemistry, Cambridge, UK.
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95
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Cybulski KE, Howlett NG. FANCP/SLX4: a Swiss army knife of DNA interstrand crosslink repair. Cell Cycle 2011; 10:1757-63. [PMID: 21527828 PMCID: PMC3142459 DOI: 10.4161/cc.10.11.15818] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 04/12/2011] [Indexed: 12/11/2022] Open
Abstract
Fanconi anemia (FA) is a rare genetic disease characterized by congenital abnormalities, bone marrow failure and heightened cancer susceptibility. The FA proteins are known to function in the cellular defense against DNA interstrand crosslinks (ICLs), a process that remains poorly understood. A recent spate of discoveries has led to the identification of one new FA gene, FANCP/SLX4, and two strong candidate FA genes, FAN1 and RAD51C. In this perspective we describe the discovery of FANCP/SLX4 and discuss how these new findings collectively refine our understanding of DNA ICL repair.
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96
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Tischkowitz M, Winqvist R. Using mouse models to investigate the biological and physiological consequences of defects in the Fanconi anaemia/breast cancer DNA repair signalling pathway. J Pathol 2011; 224:301-5. [PMID: 21557222 DOI: 10.1002/path.2903] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Revised: 03/08/2011] [Accepted: 03/18/2011] [Indexed: 02/06/2023]
Abstract
Fanconi anaemia (FA) is a rare, predominantly autosomal recessive syndrome (with one X-linked form) that results in congenital defects, abnormal haematopoiesis and a greatly increased risk of solid tumours in humans. Mutations in at least 14 different genes have been shown to cause FA, and several of these genes, including FANCJ/BRIP1, FANCD1/BRCA2 and FANCN/PALB2, also predispose to breast cancer in heterozygote carriers. The FA genes code for proteins that act in complexes to coordinate the repair of damaged DNA, and thus the FA repair network is intimately linked with hereditary breast cancer. Much remains to be learnt about the functions and interactions of the FA proteins and one experimental approach involves the generation of mice that are deficient in various FA genes. Mouse models for FANCN/PALB2 have recently been generated, including one reported in a recent issue of The Journal of Pathology. Given the pivotal role of the PALB2 protein, which interacts with both BRCA1 and BRCA2, these mice provide valuable insights into the FA phenotype and mechanisms of tumourigenesis caused by disruption of the FA protein network.
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Affiliation(s)
- Marc Tischkowitz
- McGill Program in Cancer Genetics, Departments of Human Genetics and Oncology, McGill University, Montreal, Canada.
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97
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Yusufzai T, Kadonaga JT. Branching out with DNA helicases. Curr Opin Genet Dev 2011; 21:214-8. [PMID: 21324673 DOI: 10.1016/j.gde.2011.01.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 01/18/2011] [Indexed: 10/18/2022]
Abstract
The proper resolution of branched DNA molecules, which arise during processes such as DNA replication, DNA repair, and transcription, is critical for the maintenance of the genome. Disruption of this process can lead to genome instability and cancer progression. In this review, we describe recent progress on several interesting and biologically important enzymes that act upon different types of branched DNA substrates.
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Affiliation(s)
- Timur Yusufzai
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA.
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98
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Chavez A, Agrawal V, Johnson FB. Homologous recombination-dependent rescue of deficiency in the structural maintenance of chromosomes (Smc) 5/6 complex. J Biol Chem 2010; 286:5119-25. [PMID: 21138837 DOI: 10.1074/jbc.m110.201608] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The essential and evolutionarily conserved Smc5-Smc6 complex (Smc5/6) is critical for the maintenance of genome stability. Partial loss of Smc5/6 function yields several defects in DNA repair, which are rescued by inactivation of the homologous recombination (HR) machinery. Thus HR is thought to be toxic to cells with defective Smc5/6. Recent work has highlighted a role for Smc5/6 and the Sgs1 DNA helicase in preventing the accumulation of unresolved HR intermediates. Here we investigate how deletion of MPH1, encoding the orthologue of the human FANCM DNA helicase, rescues the DNA damage sensitivity of smc5/6 but not sgs1Δ mutants. We find that MPH1 deletion diminishes accumulation of HR intermediates within both smc5/6 and sgs1Δ cells, suggesting that MPH1 deletion is sufficient to decrease the use of template switch recombination (TSR) to bypass DNA lesions. We further explain how avoidance of TSR is nonetheless insufficient to rescue defects in sgs1Δ mutants, by demonstrating a requirement for Sgs1, along with the post-replicative repair (PRR) and HR machinery, in a pathway that operates in mph1Δ mutants. In addition, we map the region of Mph1 that binds Smc5, and describe a novel allele of MPH1 encoding a protein unable to bind Smc5 (mph1-Δ60). Remarkably, mph1-Δ60 supports normal growth and responses to DNA damaging agents, indicating that Smc5/6 does not simply restrain the recombinogenic activity of Mph1 via direct binding. These data as a whole highlight a role for Smc5/6 and Sgs1 in the resolution of Mph1-dependent HR intermediates.
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Affiliation(s)
- Alejandro Chavez
- Department of Pathology and Laboratory Medicine., University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA
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99
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Kee Y, D'Andrea AD. Expanded roles of the Fanconi anemia pathway in preserving genomic stability. Genes Dev 2010; 24:1680-94. [PMID: 20713514 DOI: 10.1101/gad.1955310] [Citation(s) in RCA: 246] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Studying rare human genetic diseases often leads to a better understanding of normal cellular functions. Fanconi anemia (FA), for example, has elucidated a novel DNA repair mechanism required for maintaining genomic stability and preventing cancer. The FA pathway, an essential tumor-suppressive pathway, is required for protecting the human genome from a specific type of DNA damage; namely, DNA interstrand cross-links (ICLs). In this review, we discuss the recent progress in the study of the FA pathway, such as the identification of new FANCM-binding partners and the identification of RAD51C and FAN1 (Fanconi-associated nuclease 1) as new FA pathway-related proteins. We also focus on the role of the FA pathway as a potential regulator of DNA repair choices in response to double-strand breaks, and its novel functions during the mitotic phase of the cell cycle.
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Affiliation(s)
- Younghoon Kee
- Department of Radiation Oncology and Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA
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100
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Genetic disruption of both Fancc and Fancg in mice recapitulates the hematopoietic manifestations of Fanconi anemia. Blood 2010; 116:2915-20. [PMID: 20606166 DOI: 10.1182/blood-2009-08-240747] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Fanconi anemia (FA) is an inherited chromosomal instability syndrome characterized by bone marrow failure, myelodysplasia (MDS), and acute myeloid leukemia (AML). Eight FA proteins associate in a nuclear core complex to monoubiquitinate FANCD2/FANCI in response to DNA damage. Additional functions have been described for some of the core complex proteins; however, in vivo genetic proof has been lacking. Here we show that double-mutant Fancc(-/-);Fancg(-/-) mice develop spontaneous hematologic sequelae including bone marrow failure, AML, MDS and complex random chromosomal abnormalities that the single-mutant mice do not. This genetic model provides evidence for unique core complex protein function independent of their ability to monoubiquitinate FANCD2/FANCI. Importantly, this model closely recapitulates the phenotypes found in FA patients and may be useful as a preclinical platform to evaluate the molecular pathogenesis of spontaneous bone marrow failure, MDS and AML in FA.
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