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Hou W, Li Y, Zhang J, Xia Y, Wang X, Chen H, Lou H. Cohesin in DNA damage response and double-strand break repair. Crit Rev Biochem Mol Biol 2022; 57:333-350. [PMID: 35112600 DOI: 10.1080/10409238.2022.2027336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 01/03/2022] [Accepted: 01/06/2022] [Indexed: 11/03/2022]
Abstract
Cohesin, a four-subunit ring comprising SMC1, SMC3, RAD21 and SA1/2, tethers sister chromatids by DNA replication-coupled cohesion (RC-cohesion) to guarantee correct chromosome segregation during cell proliferation. Postreplicative cohesion, also called damage-induced cohesion (DI-cohesion), is an emerging critical player in DNA damage response (DDR). In this review, we sum up recent progress on how cohesin regulates the DNA damage checkpoint activation and repair pathway choice, emphasizing postreplicative cohesin loading and DI-cohesion establishment in yeasts and mammals. DI-cohesion and RC-cohesion show distinct features in many aspects. DI-cohesion near or far from the break sites might undergo different regulations and execute different tasks in DDR and DSB repair. Furthermore, some open questions in this field and the significance of this new scenario to our understanding of genome stability maintenance and cohesinopathies are discussed.
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Affiliation(s)
- Wenya Hou
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
| | - Yan Li
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
| | - Jiaxin Zhang
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
| | - Yisui Xia
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
| | - Xueting Wang
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
- Union Shenzhen Hospital, Department of Dermatology, Huazhong University of Science and Technology (Nanshan Hospital), Shenzhen, Guangdong, China
| | - Hongxiang Chen
- Union Shenzhen Hospital, Department of Dermatology, Huazhong University of Science and Technology (Nanshan Hospital), Shenzhen, Guangdong, China
| | - Huiqiang Lou
- Shenzhen University General Hospital, Guangdong Key Laboratory for Genome Stability & Disease Prevention, Shenzhen University School of Medicine, Shenzhen, Guangdong, China
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2
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Searching for New Z-DNA/Z-RNA Binding Proteins Based on Structural Similarity to Experimentally Validated Zα Domain. Int J Mol Sci 2022; 23:ijms23020768. [PMID: 35054954 PMCID: PMC8775963 DOI: 10.3390/ijms23020768] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/03/2022] [Accepted: 01/05/2022] [Indexed: 11/17/2022] Open
Abstract
Z-DNA and Z-RNA are functionally important left-handed structures of nucleic acids, which play a significant role in several molecular and biological processes including DNA replication, gene expression regulation and viral nucleic acid sensing. Most proteins that have been proven to interact with Z-DNA/Z-RNA contain the so-called Zα domain, which is structurally well conserved. To date, only eight proteins with Zα domain have been described within a few organisms (including human, mouse, Danio rerio, Trypanosoma brucei and some viruses). Therefore, this paper aimed to search for new Z-DNA/Z-RNA binding proteins in the complete PDB structures database and from the AlphaFold2 protein models. A structure-based similarity search found 14 proteins with highly similar Zα domain structure in experimentally-defined proteins and 185 proteins with a putative Zα domain using the AlphaFold2 models. Structure-based alignment and molecular docking confirmed high functional conservation of amino acids involved in Z-DNA/Z-RNA, suggesting that Z-DNA/Z-RNA recognition may play an important role in a variety of cellular processes.
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3
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Countryman P, Fan Y, Gorthi A, Pan H, Strickland E, Kaur P, Wang X, Lin J, Lei X, White C, You C, Wirth N, Tessmer I, Piehler J, Riehn R, Bishop AJR, Tao YJ, Wang H. Cohesin SA2 is a sequence-independent DNA-binding protein that recognizes DNA replication and repair intermediates. J Biol Chem 2018; 293:1054-1069. [PMID: 29175904 PMCID: PMC5777247 DOI: 10.1074/jbc.m117.806406] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 11/22/2017] [Indexed: 11/06/2022] Open
Abstract
Proper chromosome alignment and segregation during mitosis depend on cohesion between sister chromatids, mediated by the cohesin protein complex, which also plays crucial roles in diverse genome maintenance pathways. Current models attribute DNA binding by cohesin to entrapment of dsDNA by the cohesin ring subunits (SMC1, SMC3, and RAD21 in humans). However, the biophysical properties and activities of the fourth core cohesin subunit SA2 (STAG2) are largely unknown. Here, using single-molecule atomic force and fluorescence microscopy imaging as well as fluorescence anisotropy measurements, we established that SA2 binds to both dsDNA and ssDNA, albeit with a higher binding affinity for ssDNA. We observed that SA2 can switch between the 1D diffusing (search) mode on dsDNA and stable binding (recognition) mode at ssDNA gaps. Although SA2 does not specifically bind to centromeric or telomeric sequences, it does recognize DNA structures often associated with DNA replication and double-strand break repair, such as a double-stranded end, single-stranded overhang, flap, fork, and ssDNA gap. SA2 loss leads to a defect in homologous recombination-mediated DNA double-strand break repair. These results suggest that SA2 functions at intermediate DNA structures during DNA transactions in genome maintenance pathways. These findings have important implications for understanding the function of cohesin in these pathways.
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Affiliation(s)
| | - Yanlin Fan
- the Department of BioSciences, Rice University, Houston, Texas 77251
| | - Aparna Gorthi
- the Greehey Children's Cancer Research Institute and
- Department of Cell Systems and Anatomy, University of Texas Health, San Antonio, Texas 78229
| | | | | | | | | | - Jiangguo Lin
- From the Physics Department
- the Institute of Biomechanics, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, Guangdong 510006, China
| | - Xiaoying Lei
- the Department of BioSciences, Rice University, Houston, Texas 77251
- the School of Public Health, Shandong University, Jinan 250012, China
| | | | - Changjiang You
- the Division of Biophysics, Universität Osnabrück, Barbarstrasse 11, 49076 Osnabrück, Germany, and
| | - Nicolas Wirth
- the Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Josef-Schneider-Strasse 2, 97080 Würzburg, Germany
| | - Ingrid Tessmer
- the Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Josef-Schneider-Strasse 2, 97080 Würzburg, Germany
| | - Jacob Piehler
- the Division of Biophysics, Universität Osnabrück, Barbarstrasse 11, 49076 Osnabrück, Germany, and
| | | | - Alexander J R Bishop
- the Greehey Children's Cancer Research Institute and
- Department of Cell Systems and Anatomy, University of Texas Health, San Antonio, Texas 78229
| | - Yizhi Jane Tao
- the Department of BioSciences, Rice University, Houston, Texas 77251
| | - Hong Wang
- From the Physics Department,
- Center for Human Health and the Environment, North Carolina State University, Raleigh, North Carolina 27695
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4
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Abstract
Genome function, replication, integrity, and propagation rely on the dynamic structural organization of chromosomes during the cell cycle. Genome folding in interphase provides regulatory segmentation for appropriate transcriptional control, facilitates ordered genome replication, and contributes to genome integrity by limiting illegitimate recombination. Here, we review recent high-resolution chromosome conformation capture and functional studies that have informed models of the spatial and regulatory compartmentalization of mammalian genomes, and discuss mechanistic models for how CTCF and cohesin control the functional architecture of mammalian chromosomes.
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Affiliation(s)
- Matthias Merkenschlager
- MRC Clinical Sciences Centre, Faculty of Medicine, Imperial College London, London W12 0NN, United Kingdom;
| | - Elphège P Nora
- Gladstone Institute of Cardiovascular Disease, San Francisco, California 94158;
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5
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Lin J, Countryman P, Chen H, Pan H, Fan Y, Jiang Y, Kaur P, Miao W, Gurgel G, You C, Piehler J, Kad NM, Riehn R, Opresko PL, Smith S, Tao YJ, Wang H. Functional interplay between SA1 and TRF1 in telomeric DNA binding and DNA-DNA pairing. Nucleic Acids Res 2016; 44:6363-76. [PMID: 27298259 PMCID: PMC5291270 DOI: 10.1093/nar/gkw518] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Accepted: 05/30/2016] [Indexed: 12/23/2022] Open
Abstract
Proper chromosome alignment and segregation during mitosis depend on cohesion between sister chromatids. Cohesion is thought to occur through the entrapment of DNA within the tripartite ring (Smc1, Smc3 and Rad21) with enforcement from a fourth subunit (SA1/SA2). Surprisingly, cohesin rings do not play a major role in sister telomere cohesion. Instead, this role is replaced by SA1 and telomere binding proteins (TRF1 and TIN2). Neither the DNA binding property of SA1 nor this unique telomere cohesion mechanism is understood. Here, using single-molecule fluorescence imaging, we discover that SA1 displays two-state binding on DNA: searching by one-dimensional (1D) free diffusion versus recognition through subdiffusive sliding at telomeric regions. The AT-hook motif in SA1 plays dual roles in modulating non-specific DNA binding and subdiffusive dynamics over telomeric regions. TRF1 tethers SA1 within telomeric regions that SA1 transiently interacts with. SA1 and TRF1 together form longer DNA–DNA pairing tracts than with TRF1 alone, as revealed by atomic force microscopy imaging. These results suggest that at telomeres cohesion relies on the molecular interplay between TRF1 and SA1 to promote DNA–DNA pairing, while along chromosomal arms the core cohesin assembly might also depend on SA1 1D diffusion on DNA and sequence-specific DNA binding.
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Affiliation(s)
- Jiangguo Lin
- School of Bioscience and Engineering, South China University of Technology, Guangzhou, Guangdong 510006, P.R. China Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Preston Countryman
- Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Haijiang Chen
- Department of BioSciences, Rice University, Houston, TX 77005, USA Institute of Microbiology and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, P.R. China
| | - Hai Pan
- Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Yanlin Fan
- Department of BioSciences, Rice University, Houston, TX 77005, USA
| | - Yunyun Jiang
- Department of BioSciences, Rice University, Houston, TX 77005, USA
| | - Parminder Kaur
- Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Wang Miao
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450014, P.R. China
| | - Gisele Gurgel
- Biomanufacturing Training and Education Center, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Changjiang You
- Division of Biophysics, Universität Osnabrück, Barbarstrasse 11, 49076 Osnabrück, Germany
| | - Jacob Piehler
- Division of Biophysics, Universität Osnabrück, Barbarstrasse 11, 49076 Osnabrück, Germany
| | - Neil M Kad
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK
| | - Robert Riehn
- Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
| | - Patricia L Opresko
- Department of Environmental and Occupational Health, University of Pittsburgh, PA 15213, USA
| | - Susan Smith
- Kimmel Center for Biology and Medicine at the Skirball Institute, Department of Pathology, New York University School of Medicine, New York, NY 10016, USA
| | - Yizhi Jane Tao
- Department of BioSciences, Rice University, Houston, TX 77005, USA
| | - Hong Wang
- Physics Department, North Carolina State University, Raleigh, North Carolina, NC 27695, USA
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6
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Rudra S, Skibbens RV. Chl1 DNA helicase regulates Scc2 deposition specifically during DNA-replication in Saccharomyces cerevisiae. PLoS One 2013; 8:e75435. [PMID: 24086532 PMCID: PMC3784445 DOI: 10.1371/journal.pone.0075435] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 08/13/2013] [Indexed: 11/19/2022] Open
Abstract
The conserved family of cohesin proteins that mediate sister chromatid cohesion requires Scc2, Scc4 for chromatin-association and Eco1/Ctf7 for conversion to a tethering competent state. A popular model, based on the notion that cohesins form huge ring-like structures, is that Scc2, Scc4 function is essential only during G1 such that sister chromatid cohesion results simply from DNA replisome passage through pre-loaded cohesin rings. In such a scenario, cohesin deposition during G1 is temporally uncoupled from Eco1-dependent establishment reactions that occur during S-phase. Chl1 DNA helicase (homolog of human ChlR1/DDX11 and BACH1/BRIP1/FANCJ helicases implicated in Fanconi anemia, breast and ovarian cancer and Warsaw Breakage Syndrome) plays a critical role in sister chromatid cohesion, however, the mechanism through which Chl1 promotes cohesion remains poorly understood. Here, we report that Chl1 promotes Scc2 loading unto DNA such that both Scc2 and cohesin enrichment to chromatin are defective in chl1 mutant cells. The results further show that both Chl1 expression and chromatin-recruitment are tightly regulated through the cell cycle, peaking during S-phase. Importantly, kinetic ChIP studies reveals that Chl1 is required for Scc2 chromatin-association specifically during S-phase, but not during G1. Despite normal chromatin enrichment of both Scc2 and cohesin during G1, chl1 mutant cells exhibit severe chromosome segregation and cohesion defects--revealing that G1-loaded cohesins is insufficient to promote cohesion. Based on these findings, we propose a new model wherein S-phase cohesin loading occurs during DNA replication and in concert with both cohesion establishment and chromatin assembly reactions--challenging the notion that DNA replication fork navigates through or around pre-loaded cohesin rings.
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Affiliation(s)
- Soumya Rudra
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Robert V. Skibbens
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
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7
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Redondo-Muñoz J, Rodríguez MJ, Silió V, Pérez-García V, Valpuesta JM, Carrera AC. Phosphoinositide 3-kinase beta controls replication factor C assembly and function. Nucleic Acids Res 2012; 41:855-68. [PMID: 23175608 PMCID: PMC3553946 DOI: 10.1093/nar/gks1095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Genomic integrity is preserved by the action of protein complexes that control DNA homeostasis. These include the sliding clamps, trimeric protein rings that are arranged around DNA by clamp loaders. Replication factor C (RFC) is the clamp loader for proliferating cell nuclear antigen, which acts on DNA replication. Other processes that require mobile contact of proteins with DNA use alternative RFC complexes that exchange RFC1 for CTF18 or RAD17. Phosphoinositide 3-kinases (PI3K) are lipid kinases that generate 3-poly-phosphorylated-phosphoinositides at the plasma membrane following receptor stimulation. The two ubiquitous isoforms, PI3Kalpha and PI3Kbeta, have been extensively studied due to their involvement in cancer and nuclear PI3Kbeta has been found to regulate DNA replication and repair, processes controlled by molecular clamps. We studied here whether PI3Kbeta directly controls the process of molecular clamps loading. We show that PI3Kbeta associated with RFC1 and RFC1-like subunits. Only when in complex with PI3Kbeta, RFC1 bound to Ran GTPase and localized to the nucleus, suggesting that PI3Kbeta regulates RFC1 nuclear import. PI3Kbeta controlled not only RFC1- and RFC-RAD17 complexes, but also RFC-CTF18, in turn affecting CTF18-mediated chromatid cohesion. PI3Kbeta thus has a general function in genomic stability by controlling the localization and function of RFC complexes.
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Affiliation(s)
- Javier Redondo-Muñoz
- Department of Immunology and Oncology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus de Cantoblanco, Madrid E-28049, Spain
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8
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Horsfield JA, Print CG, Mönnich M. Diverse developmental disorders from the one ring: distinct molecular pathways underlie the cohesinopathies. Front Genet 2012; 3:171. [PMID: 22988450 PMCID: PMC3439829 DOI: 10.3389/fgene.2012.00171] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2012] [Accepted: 08/17/2012] [Indexed: 11/13/2022] Open
Abstract
The multi-subunit protein complex, cohesin, is responsible for sister chromatid cohesion during cell division. The interaction of cohesin with DNA is controlled by a number of additional regulatory proteins. Mutations in cohesin, or its regulators, cause a spectrum of human developmental syndromes known as the “cohesinopathies.” Cohesinopathy disorders include Cornelia de Lange Syndrome and Roberts Syndrome. The discovery of novel roles for chromatid cohesion proteins in regulating gene expression led to the idea that cohesinopathies are caused by dysregulation of multiple genes downstream of mutations in cohesion proteins. Consistent with this idea, Drosophila, mouse, and zebrafish cohesinopathy models all show altered expression of developmental genes. However, there appears to be incomplete overlap among dysregulated genes downstream of mutations in different components of the cohesion apparatus. This is surprising because mutations in all cohesion proteins would be predicted to affect cohesin’s roles in cell division and gene expression in similar ways. Here we review the differences and similarities between genetic pathways downstream of components of the cohesion apparatus, and discuss how such differences might arise, and contribute to the spectrum of cohesinopathy disorders. We propose that mutations in different elements of the cohesion apparatus have distinct developmental outcomes that can be explained by sometimes subtly different molecular effects.
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Affiliation(s)
- Julia A Horsfield
- Department of Pathology, Dunedin School of Medicine, The University of Otago Dunedin, New Zealand
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9
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Higashi TL, Ikeda M, Tanaka H, Nakagawa T, Bando M, Shirahige K, Kubota Y, Takisawa H, Masukata H, Takahashi TS. The prereplication complex recruits XEco2 to chromatin to promote cohesin acetylation in Xenopus egg extracts. Curr Biol 2012; 22:977-88. [PMID: 22560615 DOI: 10.1016/j.cub.2012.04.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Revised: 03/08/2012] [Accepted: 04/04/2012] [Indexed: 01/31/2023]
Abstract
BACKGROUND Sister chromatids are held together by the ring-shaped cohesin complex, which is loaded onto chromosomes before DNA replication. Cohesion between sister chromosomes is established during DNA replication, and it requires acetylation of the Smc3 subunit of cohesin by evolutionally conserved cohesin acetyltransferases (CoATs). However, how CoATs are recruited to chromatin and how cohesin acetylation is regulated remain unclear. RESULTS We found that cohesin acetylation requires pre-RC-dependent chromatin loading of cohesin, but surprisingly, it is independent of DNA synthesis in Xenopus egg extracts. Immunodepletion experiments revealed that XEco2 is the CoAT responsible for Smc3 acetylation and sister chromatid cohesion. Recruitment of XEco2 onto chromatin was dependent on pre-RC assembly but was independent of cohesin loading and DNA synthesis. Two short N-terminal motifs, PBM-A and PBM-B, which are conserved among vertebrate Esco2/XEco2 homologs, were collectively essential for pre-RC-dependent chromatin association of XEco2, cohesin acetylation, and subsequent sister chromatid cohesion. The conserved PCNA-interacting protein box in XEco2 was largely dispensable for Smc3 acetylation but was partially required for cohesion. Interaction of acetylated cohesin with DNA was stabilized against salt-wash treatments after DNA replication. CONCLUSIONS Our results demonstrate that pre-RC formation regulates chromatin association of XEco2 in Xenopus egg extracts. We propose that this reaction is critical to acetylate cohesin, whose DNA binding is subsequently stabilized by DNA replication.
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Affiliation(s)
- Torahiko L Higashi
- Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan
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10
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Rhodes JM, McEwan M, Horsfield JA. Gene regulation by cohesin in cancer: is the ring an unexpected party to proliferation? Mol Cancer Res 2011; 9:1587-607. [PMID: 21940756 DOI: 10.1158/1541-7786.mcr-11-0382] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cohesin is a multisubunit protein complex that plays an integral role in sister chromatid cohesion, DNA repair, and meiosis. Of significance, both over- and underexpression of cohesin are associated with cancer. It is generally believed that cohesin dysregulation contributes to cancer by leading to aneuploidy or chromosome instability. For cancers with loss of cohesin function, this idea seems plausible. However, overexpression of cohesin in cancer appears to be more significant for prognosis than its loss. Increased levels of cohesin subunits correlate with poor prognosis and resistance to drug, hormone, and radiation therapies. However, if there is sufficient cohesin for sister chromatid cohesion, overexpression of cohesin subunits should not obligatorily lead to aneuploidy. This raises the possibility that excess cohesin promotes cancer by alternative mechanisms. Over the last decade, it has emerged that cohesin regulates gene transcription. Recent studies have shown that gene regulation by cohesin contributes to stem cell pluripotency and cell differentiation. Of importance, cohesin positively regulates the transcription of genes known to be dysregulated in cancer, such as Runx1, Runx3, and Myc. Furthermore, cohesin binds with estrogen receptor α throughout the genome in breast cancer cells, suggesting that it may be involved in the transcription of estrogen-responsive genes. Here, we will review evidence supporting the idea that the gene regulation function of cohesin represents a previously unrecognized mechanism for the development of cancer.
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Affiliation(s)
- Jenny M Rhodes
- Department of Pathology, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand
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11
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Skibbens RV. Sticking a fork in cohesin--it's not done yet! Trends Genet 2011; 27:499-506. [PMID: 21943501 DOI: 10.1016/j.tig.2011.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 08/25/2011] [Accepted: 08/26/2011] [Indexed: 12/28/2022]
Abstract
To identify the products of chromosome replication (termed sister chromatids) from S-phase through M-phase of the cell cycle, each sister pair becomes tethered together by specialized protein complexes termed cohesins. To participate in sister tethering reactions, chromatin-bound cohesins become modified by establishment factors that function during S-phase and bind to DNA replication-fork components. Early models posited that establishment factors might move with replication forks, but that fork progression takes place independently of cohesion pathways. Recent studies now suggest that progression of the replication fork and/or S-phase are slowed in cohesion-deficient cells. These findings have led to speculations that cohesin ring-like structures normally hinder fork progression but coordinate origin firing during replication. Neither model, however, fully explains the diverse effects of cohesion mutation on replication kinetics. I discuss these challenges and then offer alternative views that include cohesin-independent mechanisms for replication-fork destabilization and transcription-based effects on S-phase progression.
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Affiliation(s)
- Robert V Skibbens
- Department of Biological Sciences, Lehigh University, 111 Research Drive, Bethlehem, PA 18015, USA.
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12
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Farcas AM, Uluocak P, Helmhart W, Nasmyth K. Cohesin's concatenation of sister DNAs maintains their intertwining. Mol Cell 2011; 44:97-107. [PMID: 21981921 PMCID: PMC3240746 DOI: 10.1016/j.molcel.2011.07.034] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/17/2011] [Accepted: 07/08/2011] [Indexed: 11/29/2022]
Abstract
The contribution of DNA catenation to sister chromatid cohesion is unclear partly because it has never been observed directly within mitotic chromosomes. Differential sedimentation-velocity and gel electrophoresis reveal that sisters of 26 kb circular minichromosomes are held together by catenation as well as by cohesin. The finding that chemical crosslinking of cohesin's three subunit interfaces entraps sister DNAs of circular but not linear minichromosomes implies that cohesin functions using a topological principle. Importantly, cohesin holds both catenated and uncatenated DNAs together in this manner. In the vicinity of centromeres, catenanes are resolved by spindle forces, but linkages mediated directly by cohesin resist these forces even after complete decatenation. Crucially, persistence of catenation after S phase depends on cohesin. We conclude that by retarding Topo II-driven decatenation, cohesin mediates sister chromatid cohesion by an indirect mechanism as well as one involving entrapment of sister DNAs inside its tripartite ring.
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Affiliation(s)
- Ana-Maria Farcas
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Pelin Uluocak
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Wolfgang Helmhart
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Kim Nasmyth
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
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13
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Affiliation(s)
- Aaron J Schetter
- National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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14
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Dorsett D. Cohesin: genomic insights into controlling gene transcription and development. Curr Opin Genet Dev 2011; 21:199-206. [PMID: 21324671 PMCID: PMC3070859 DOI: 10.1016/j.gde.2011.01.018] [Citation(s) in RCA: 156] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 01/18/2011] [Indexed: 01/01/2023]
Abstract
Over the past decade it has emerged that the cohesin protein complex, which functions in sister chromatid cohesion, chromosome segregation, and DNA repair, also regulates gene expression and development. Even minor changes in cohesin activity alter several aspects of development. Genome-wide analysis indicates that cohesin directly regulates transcription of genes involved in cell proliferation, pluripotency, and differentiation through multiple mechanisms. These mechanisms are poorly understood, but involve both partial gene repression in concert with Polycomb group proteins, and facilitating long-range looping, both between enhancers and promoters, and between CTCF protein binding sites.
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Affiliation(s)
- Dale Dorsett
- Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, Saint Louis, MO 63104, United States.
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15
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Maradeo ME, Garg A, Skibbens RV. Rfc5p regulates alternate RFC complex functions in sister chromatid pairing reactions in budding yeast. Cell Cycle 2010; 9:4370-8. [PMID: 20980821 DOI: 10.4161/cc.9.21.13634] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Sister chromatid pairing reactions, termed cohesion establishment, occur during S-phase and appear to be regulated by Replication Factor C (RFC) complexes. For instance, RFCs that contain Ctf18p exhibit pro-establishment activities while those that contain Elg1p exhibit anti-establishment activities. It remains unknown whether Ctf18p-RFC and Elg1p-RFC functions are simply opposing or instead reveal complicated and non-parallel regulatory mechanisms. To better understand the nature of these novel pathways, we analyzed the small RFC subunit Rfc5p that is common to both Ctf18p-RFC and Elg1p-RFC. Despite this commonality, the data show that diminished Rfc5p function rescues ctf7/eco1 mutant cell phenotypes, revealing that Rfc5p promotes anti-establishment activities. This rescue is specific to establishment pathways in that rfc5-1 greatly accentuates growth defects when expressed in scc2 (deposition), mcd1/scc1 or smc3 (cohesion maintenance) mutated cells. Our results reveal for the first time a role for small RFC subunits in directing RFC complex functions-in this case towards anti-establishment pathways. We further report that Pds5p exhibits both establishment and anti-establishment functions in cohesion. This duality suggests that categorizations of establishment and anti-establishment activities require further examination.
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Affiliation(s)
- Marie E Maradeo
- Dept. of Biological Sciences, Lehigh University, Bethlehem, PA, USA
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Maradeo ME, Skibbens RV. Replication factor C complexes play unique pro- and anti-establishment roles in sister chromatid cohesion. PLoS One 2010; 5:e15381. [PMID: 21060875 PMCID: PMC2965161 DOI: 10.1371/journal.pone.0015381] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Accepted: 09/01/2010] [Indexed: 11/25/2022] Open
Abstract
Recent studies have lead to a rapid expansion of sister chromatid cohesion pathways. Of particular interest is the growth in classifications of anti-establishment factors-now including those that are cohesin-associated (Rad61/WAPL and Pds5) or DNA replication fork-associated (Elg1-RFC). In this study, we show that the two classes of anti-establishment complexes are indistinguishable when challenged both genetically and functionally. These findings suggest that both classes function in a singular pathway that is centered on Ctf7/Eco1 (herein termed Ctf7) regulation. The anti-establishment activity of Elg1-RFC complex is particular intriguing given that an alternate Ctf18-RFC complex exhibits robust pro-establishment activity. Here, we provide several lines of evidence, including the use of Ctf7 bypass suppressors, indicating that these activities are not simply antagonistic. Moreover, the results suggest that Ctf18-RFC is capable of promoting sister chromatid pairing reactions independent of Ctf7. The combination of these studies suggest a new model of sister chromatid pairing regulation.
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Affiliation(s)
- Marie E. Maradeo
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Robert V. Skibbens
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
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Maradeo ME, Skibbens RV. Epitope tag-induced synthetic lethality between cohesin subunits and Ctf7/Eco1 acetyltransferase. FEBS Lett 2010; 584:4037-40. [PMID: 20728441 PMCID: PMC2946494 DOI: 10.1016/j.febslet.2010.08.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 08/04/2010] [Accepted: 08/13/2010] [Indexed: 11/15/2022]
Abstract
Ctf7/Eco1-dependent acetylation of Smc3 is essential for sister chromatid cohesion. Here, we use epitope tag-induced lethality in cells diminished for Ctf7/Eco1 activity to map cohesin architecture in vivo. Tagging either Smc1 or Mcd1/Scc1, but not Scc3/Irr1, appears to abolish access to Smc3 in ctf7/eco1 mutant cells, suggesting that Smc1 and Smc3 head domains are in direct contact with each other and also with Mcd1/Scc1. Thus, cohesin complexes may be much more compact than commonly portrayed. We further demonstrate that mutation in ELG1 or RFC5 anti-establishment genes suppress tag-induced lethality, consistent with the notion that the replication fork regulates Ctf7/Eco1.
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Affiliation(s)
- Marie E Maradeo
- Department of Biological Sciences, Lehigh University, Bethlehem, PA 18015, USA
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Skibbens RV. A sliding scale: the many faces of Ctf7/Eco1 cohesion establishment factor in DNA repair. Cell Cycle 2010; 9:3642-3. [PMID: 20930512 PMCID: PMC3069552 DOI: 10.4161/cc.9.18.13181] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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