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Di Nardo M, Musio A. Cohesin - bridging the gap among gene transcription, genome stability, and human diseases. FEBS Lett 2024. [PMID: 38852996 DOI: 10.1002/1873-3468.14949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Revised: 04/15/2024] [Accepted: 05/08/2024] [Indexed: 06/11/2024]
Abstract
The intricate landscape of cellular processes governing gene transcription, chromatin organization, and genome stability is a fascinating field of study. A key player in maintaining this delicate equilibrium is the cohesin complex, a molecular machine with multifaceted roles. This review presents an in-depth exploration of these intricate connections and their significant impact on various human diseases.
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Affiliation(s)
- Maddalena Di Nardo
- Institute for Biomedical Technologies (ITB), National Research Council (CNR), Pisa, Italy
| | - Antonio Musio
- Institute for Biomedical Technologies (ITB), National Research Council (CNR), Pisa, Italy
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2
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Chea S, Kreger J, Lopez-Burks ME, MacLean AL, Lander AD, Calof AL. Gastrulation-stage gene expression in Nipbl+/- mouse embryos foreshadows the development of syndromic birth defects. SCIENCE ADVANCES 2024; 10:eadl4239. [PMID: 38507484 PMCID: PMC10954218 DOI: 10.1126/sciadv.adl4239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 02/15/2024] [Indexed: 03/22/2024]
Abstract
In animal models, Nipbl deficiency phenocopies gene expression changes and birth defects seen in Cornelia de Lange syndrome, the most common cause of which is Nipbl haploinsufficiency. Previous studies in Nipbl+/- mice suggested that heart development is abnormal as soon as cardiogenic tissue is formed. To investigate this, we performed single-cell RNA sequencing on wild-type and Nipbl+/- mouse embryos at gastrulation and early cardiac crescent stages. Nipbl+/- embryos had fewer mesoderm cells than wild-type and altered proportions of mesodermal cell subpopulations. These findings were associated with underexpression of genes implicated in driving specific mesodermal lineages. In addition, Nanog was found to be overexpressed in all germ layers, and many gene expression changes observed in Nipbl+/- embryos could be attributed to Nanog overexpression. These findings establish a link between Nipbl deficiency, Nanog overexpression, and gene expression dysregulation/lineage misallocation, which ultimately manifest as birth defects in Nipbl+/- animals and Cornelia de Lange syndrome.
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Affiliation(s)
- Stephenson Chea
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, CA 92697, USA
- Center for Complex Biological Systems, University of California Irvine, Irvine, CA 92697, USA
| | - Jesse Kreger
- Department of Quantitative and Computational Biology, Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Martha E. Lopez-Burks
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, CA 92697, USA
- Center for Complex Biological Systems, University of California Irvine, Irvine, CA 92697, USA
| | - Adam L. MacLean
- Department of Quantitative and Computational Biology, Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Arthur D. Lander
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, CA 92697, USA
- Center for Complex Biological Systems, University of California Irvine, Irvine, CA 92697, USA
| | - Anne L. Calof
- Department of Developmental and Cell Biology, School of Biological Sciences, University of California Irvine, Irvine, CA 92697, USA
- Center for Complex Biological Systems, University of California Irvine, Irvine, CA 92697, USA
- Department of Anatomy and Neurobiology, School of Medicine, University of California Irvine, Irvine, CA 92697, USA
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3
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Chea S, Kreger J, Lopez-Burks ME, MacLean AL, Lander AD, Calof AL. Gastrulation-stage gene expression in Nipbl +/- mouse embryos foreshadows the development of syndromic birth defects. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.10.16.558465. [PMID: 37905011 PMCID: PMC10614802 DOI: 10.1101/2023.10.16.558465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
In animal models, Nipbl-deficiency phenocopies gene expression changes and birth defects seen in Cornelia de Lange Syndrome (CdLS), the most common cause of which is Nipbl-haploinsufficiency. Previous studies in Nipbl+/- mice suggested that heart development is abnormal as soon as cardiogenic tissue is formed. To investigate this, we performed single-cell RNA-sequencing on wildtype (WT) and Nipbl+/- mouse embryos at gastrulation and early cardiac crescent stages. Nipbl+/- embryos had fewer mesoderm cells than WT and altered proportions of mesodermal cell subpopulations. These findings were associated with underexpression of genes implicated in driving specific mesodermal lineages. In addition, Nanog was found to be overexpressed in all germ layers, and many gene expression changes observed in Nipbl+/- embryos could be attributed to Nanog overexpression. These findings establish a link between Nipbl-deficiency, Nanog overexpression, and gene expression dysregulation/lineage misallocation, which ultimately manifest as birth defects in Nipbl+/- animals and CdLS. Teaser Gene expression changes during gastrulation of Nipbl-deficient mice shed light on early origins of structural birth defects.
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4
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Yu R, Roseman S, Siegenfeld AP, Nguyen SC, Joyce EF, Liau BB, Krantz ID, Alexander KA, Berger SL. CTCF/cohesin organize the ground state of chromatin-nuclear speckle association. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.22.550178. [PMID: 37961560 PMCID: PMC10634669 DOI: 10.1101/2023.07.22.550178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
The interchromatin space in the cell nucleus contains various membrane-less nuclear bodies. Recent findings indicate that nuclear speckles, comprising a distinct nuclear body, exhibit interactions with certain chromatin regions in a ground state. Key questions are how this ground state of chromatin-nuclear speckle association is established and what are the gene regulatory roles of this layer of nuclear organization. We report here that chromatin structural factors CTCF and cohesin are required for full ground state association between DNA and nuclear speckles. Disruption of ground state DNA-speckle contacts via either CTCF depletion or cohesin depletion had minor effects on basal level expression of speckle-associated genes, however we show strong negative effects on stimulus-dependent induction of speckle-associated genes. We identified a putative speckle targeting motif (STM) within cohesin subunit RAD21 and demonstrated that the STM is required for chromatin-nuclear speckle association. In contrast to reduction of CTCF or RAD21, depletion of the cohesin releasing factor WAPL stabilized cohesin on chromatin and DNA-speckle contacts, resulting in enhanced inducibility of speckle-associated genes. In addition, we observed disruption of chromatin-nuclear speckle association in patient derived cells with Cornelia de Lange syndrome (CdLS), a congenital neurodevelopmental diagnosis involving defective cohesin pathways, thus revealing nuclear speckles as an avenue for therapeutic inquiry. In summary, our findings reveal a mechanism to establish the ground organizational state of chromatin-speckle association, to promote gene inducibility, and with relevance to human disease.
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5
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Chen J, Floyd EN, Dawson DS, Rankin S. Cornelia de Lange Syndrome mutations in SMC1A cause cohesion defects in yeast. Genetics 2023; 225:iyad159. [PMID: 37650609 PMCID: PMC10550314 DOI: 10.1093/genetics/iyad159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Revised: 08/07/2023] [Accepted: 08/11/2023] [Indexed: 09/01/2023] Open
Abstract
Cornelia de Lange Syndrome (CdLS) is a developmental disorder characterized by limb truncations, craniofacial abnormalities, and cognitive delays. CdLS is caused mainly by mutations in genes encoding subunits or regulators of the cohesin complex. Cohesin plays 2 distinct roles in chromosome dynamics as follows: it promotes looping, organization, and compaction of individual chromosomes, and it holds newly replicated sister chromatids together until cell division. CdLS-associated mutations result in altered gene expression likely by affecting chromosome architecture. Whether CdLS mutations cause phenotypes through impact on sister chromatid cohesion is less clear. Here, we show that CdLS-associated mutations introduced into the SMC1A gene of budding yeast had measurable impacts on sister chromatid cohesion, mitotic progression, and DNA damage sensitivity. These data suggest that sister chromatid cohesion-related defects may contribute to phenotypes seen in CdLS affected individuals.
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Affiliation(s)
- Jingrong Chen
- Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, 825 NE 13th St. Oklahoma City, OK 73104, USA
| | - Erin N Floyd
- Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, 825 NE 13th St. Oklahoma City, OK 73104, USA
| | - Dean S Dawson
- Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, 825 NE 13th St. Oklahoma City, OK 73104, USA
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Susannah Rankin
- Program in Cell Cycle and Cancer Biology, Oklahoma Medical Research Foundation, 825 NE 13th St. Oklahoma City, OK 73104, USA
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
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6
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The Green Valley of Drosophila melanogaster Constitutive Heterochromatin: Protein-Coding Genes Involved in Cell Division Control. Cells 2022; 11:cells11193058. [PMID: 36231024 PMCID: PMC9563267 DOI: 10.3390/cells11193058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/22/2022] [Accepted: 09/23/2022] [Indexed: 11/25/2022] Open
Abstract
Constitutive heterochromatin represents a significant fraction of eukaryotic genomes (10% in Arabidopsis, 20% in humans, 30% in D. melanogaster, and up to 85% in certain nematodes) and shares similar genetic and molecular properties in animal and plant species. Studies conducted over the last few years on D. melanogaster and other organisms led to the discovery of several functions associated with constitutive heterochromatin. This made it possible to revise the concept that this ubiquitous genomic territory is incompatible with gene expression. The aim of this review is to focus the attention on a group of protein-coding genes resident in D. melanogaster constitutive of heterochromatin, which are implicated in different steps of cell division.
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García-Gutiérrez P, García-Domínguez M. BETting on a Transcriptional Deficit as the Main Cause for Cornelia de Lange Syndrome. Front Mol Biosci 2021; 8:709232. [PMID: 34386522 PMCID: PMC8353280 DOI: 10.3389/fmolb.2021.709232] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 07/16/2021] [Indexed: 12/12/2022] Open
Abstract
Cornelia de Lange Syndrome (CdLS) is a human developmental syndrome with complex multisystem phenotypic features. It has been traditionally considered a cohesinopathy together with other phenotypically related diseases because of their association with mutations in subunits of the cohesin complex. Despite some overlap, the clinical manifestations of cohesinopathies vary considerably and, although their precise molecular mechanisms are not well defined yet, the potential pathomechanisms underlying these diverse developmental defects have been theoretically linked to alterations of the cohesin complex function. The cohesin complex plays a critical role in sister chromatid cohesion, but this function is not affected in CdLS. In the last decades, a non-cohesion-related function of this complex on transcriptional regulation has been well established and CdLS pathoetiology has been recently associated to gene expression deregulation. Up to 70% of CdLS cases are linked to mutations in the cohesin-loading factor NIPBL, which has been shown to play a prominent function on chromatin architecture and transcriptional regulation. Therefore, it has been suggested that CdLS can be considered a transcriptomopathy. Actually, CdLS-like phenotypes have been associated to mutations in chromatin-associated proteins, as KMT2A, AFF4, EP300, TAF6, SETD5, SMARCB1, MAU2, ZMYND11, MED13L, PHIP, ARID1B, NAA10, BRD4 or ANKRD11, most of which have no known direct association with cohesin. In the case of BRD4, a critical highly investigated transcriptional coregulator, an interaction with NIPBL has been recently revealed, providing evidence on their cooperation in transcriptional regulation of developmentally important genes. This new finding reinforces the notion of an altered gene expression program during development as the major etiological basis for CdLS. In this review, we intend to integrate the recent available evidence on the molecular mechanisms underlying the clinical manifestations of CdLS, highlighting data that favors a transcription-centered framework, which support the idea that CdLS could be conceptualized as a transcriptomopathy.
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Affiliation(s)
- Pablo García-Gutiérrez
- Andalusian Centre for Molecular Biology and Regenerative Medicine-CABIMER, CSIC-Universidad de Sevilla-Universidad Pablo de Olavide, Seville, Spain
| | - Mario García-Domínguez
- Andalusian Centre for Molecular Biology and Regenerative Medicine-CABIMER, CSIC-Universidad de Sevilla-Universidad Pablo de Olavide, Seville, Spain
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Moura‐Castro LH, Peña‐Martínez P, Castor A, Galeev R, Larsson J, Järås M, Yang M, Paulsson K. Sister chromatid cohesion defects are associated with chromosomal copy number heterogeneity in high hyperdiploid childhood acute lymphoblastic leukemia. Genes Chromosomes Cancer 2021; 60:410-417. [PMID: 33368842 PMCID: PMC8247877 DOI: 10.1002/gcc.22933] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/18/2020] [Accepted: 12/20/2020] [Indexed: 11/25/2022] Open
Abstract
High hyperdiploid acute lymphoblastic leukemia (ALL) is one of the most common malignancies in children. The main driver event of this disease is a nonrandom aneuploidy consisting of gains of whole chromosomes but without overt evidence of chromosomal instability (CIN). Here, we investigated the frequency and severity of defective sister chromatid cohesion-a phenomenon related to CIN-in primary pediatric ALL. We found that a large proportion (86%) of hyperdiploid cases displayed aberrant cohesion, frequently severe, to compare with 49% of ETV6/RUNX1-positive ALL, which mostly displayed mild defects. In hyperdiploid ALL, cohesion defects were associated with increased chromosomal copy number heterogeneity, which could indicate increased CIN. Furthermore, cohesion defects correlated with RAD21 and NCAPG mRNA expression, suggesting a link to reduced cohesin and condensin levels in hyperdiploid ALL. Knockdown of RAD21 in an ALL cell line led to sister chromatid cohesion defects, aberrant mitoses, and increased heterogeneity in chromosomal copy numbers, similar to what was seen in primary hyperdiploid ALL. In summary, our study shows that aberrant sister chromatid cohesion is frequent but heterogeneous in pediatric high hyperdiploid ALL, ranging from mild to very severe defects, and possibly due to low cohesin or condensin levels. Cases with high levels of aberrant chromosome cohesion displayed increased chromosomal copy number heterogeneity, possibly indicative of increased CIN. These abnormalities may play a role in the clonal evolution of hyperdiploid pediatric ALL.
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Affiliation(s)
| | - Pablo Peña‐Martínez
- Department of Laboratory Medicine, Division of Clinical GeneticsLund UniversityLundSweden
| | - Anders Castor
- Department of Pediatrics, Skåne University HospitalLund UniversityLundSweden
| | - Roman Galeev
- Division of Molecular Medicine and Gene Therapy, Lund Stem Cell CenterLund UniversityLundSweden
| | - Jonas Larsson
- Division of Molecular Medicine and Gene Therapy, Lund Stem Cell CenterLund UniversityLundSweden
| | - Marcus Järås
- Department of Laboratory Medicine, Division of Clinical GeneticsLund UniversityLundSweden
| | - Minjun Yang
- Department of Laboratory Medicine, Division of Clinical GeneticsLund UniversityLundSweden
| | - Kajsa Paulsson
- Department of Laboratory Medicine, Division of Clinical GeneticsLund UniversityLundSweden
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9
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Regulation and dysregulation of spatial chromatin structure in the central nervous system. Anat Sci Int 2021; 96:179-186. [PMID: 33392926 DOI: 10.1007/s12565-020-00567-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 08/27/2020] [Indexed: 12/24/2022]
Abstract
Chromatin exists as a non-linear, "three-dimensional" structure in the nuclear space. The dynamic alteration of the chromatin structure leads to transcriptional changes during the formation of the neuronal network. Several studies providing evidence for the link between the dysregulation of spatial chromatin architecture and developmental disorders have accumulated. Therefore, we studied and reviewed the regulation and dysregulation of 3D genome organization in the central nervous system, with a special focus on the cohesin complex that is crucial for the formation of the chromatin loop structure. This review summarizes the function and mechanisms of spatial chromatin architecture during the development of the central nervous system. We discuss the link between the disturbances in the 3D chromatin structure and the diseases of the central nervous system. Finally, we discuss how the knowledge of 3D genome organization may lead to further advances in diagnosis and therapy for the diseases of the central nervous system.
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10
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Mondal G, Stevers M, Goode B, Ashworth A, Solomon DA. A requirement for STAG2 in replication fork progression creates a targetable synthetic lethality in cohesin-mutant cancers. Nat Commun 2019; 10:1686. [PMID: 30975996 PMCID: PMC6459917 DOI: 10.1038/s41467-019-09659-z] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 03/25/2019] [Indexed: 12/22/2022] Open
Abstract
Cohesin is a multiprotein ring that is responsible for cohesion of sister chromatids and formation of DNA loops to regulate gene expression. Genomic analyses have identified that the cohesin subunit STAG2 is frequently inactivated by mutations in cancer. However, the reason STAG2 mutations are selected during tumorigenesis and strategies for therapeutically targeting mutant cancer cells are largely unknown. Here we show that STAG2 is essential for DNA replication fork progression, whereby STAG2 inactivation in non-transformed cells leads to replication fork stalling and collapse with disruption of interaction between the cohesin ring and the replication machinery as well as failure to establish SMC3 acetylation. As a consequence, STAG2 mutation confers synthetic lethality with DNA double-strand break repair genes and increased sensitivity to select cytotoxic chemotherapeutic agents and PARP or ATR inhibitors. These studies identify a critical role for STAG2 in replication fork procession and elucidate a potential therapeutic strategy for cohesin-mutant cancers.
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Affiliation(s)
- Gourish Mondal
- Department of Pathology, University of California, San Francisco, CA, 94143, USA
| | - Meredith Stevers
- Department of Pathology, University of California, San Francisco, CA, 94143, USA
| | - Benjamin Goode
- Department of Pathology, University of California, San Francisco, CA, 94143, USA
| | - Alan Ashworth
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, 94158, USA
- Division of Hematology and Oncology, Department of Medicine, University of California, San Francisco, CA, 94158, USA
| | - David A Solomon
- Department of Pathology, University of California, San Francisco, CA, 94143, USA.
- UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA, 94158, USA.
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11
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O’Hare EA, Antin PB, Delany ME. Two Proximally Close Priority Candidate Genes for diplopodia-1, an Autosomal Inherited Craniofacial-Limb Syndrome in the Chicken: MRE11 and GPR83. J Hered 2019; 110:194-210. [PMID: 30597046 PMCID: PMC6399517 DOI: 10.1093/jhered/esy071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 12/29/2018] [Indexed: 11/12/2022] Open
Abstract
Next-generation sequencing (NGS) and expression technologies were utilized to investigate the genes and sequence elements in a 586 kb region of chicken chromosome 1 associated with the autosomal recessive diplopodia-1 (dp-1) mutation. This mutation shows a syndromic phenotype similar to known human developmental abnormalities (e.g., cleft palate, polydactyly, omphalocele [exposed viscera]). Toward our goal to ascertain the variant responsible, the entire 586 kb region was sequenced following utilization of a specifically designed capture array and to confirm/validate fine-mapping results. Bioinformatic analyses identified a total of 6142 sequence variants, which included SNPs, indels, and gaps. Of these, 778 SNPs, 146 micro-indels, and 581 gaps were unique to the UCD-Dp-1.003 inbred congenic line; those found within exons and splice sites were studied for contribution to the mutant phenotype. Upon further validation with additional mutant samples, a smaller subset (of variants [51]) remains linked to the mutation. Additionally, utilization of specific samples in the NGS technology was advantageous in that fine-mapping methodologies eliminated an additional 326 kb of sequence information on chromosome 1. Predicted and confirmed protein-coding genes within the smaller 260 kb region were assessed for their developmental expression patterns over several stages of early embryogenesis in regions/tissues of interest (e.g., digits, craniofacial region). Based on these results and known function in other vertebrates, 2 genes within 5 kb of each other, MRE11 and GPR83, are proposed as high-priority candidates for the dp-1 mutation.
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Affiliation(s)
- Elizabeth A O’Hare
- Department of Animal Science, University of California, Davis, CA
- Elizabeth A. O’Hare is now at the Department of Biological Sciences, Towson University, Towson, MD
| | - Parker B Antin
- Department of Molecular and Cellular Medicine, University of Arizona, Tucson, AZ
| | - Mary E Delany
- Department of Animal Science, University of California, Davis, CA
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12
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Litwin I, Wysocki R. New insights into cohesin loading. Curr Genet 2018; 64:53-61. [PMID: 28631016 DOI: 10.1007/s00294-017-0723-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 06/12/2017] [Accepted: 06/13/2017] [Indexed: 01/13/2023]
Abstract
Cohesin is a conserved, ring-shaped protein complex that encircles sister chromatids and ensures correct chromosome segregation during mitosis and meiosis. It also plays a crucial role in the regulation of gene expression, DNA condensation, and DNA repair through both non-homologous end joining and homologous recombination. Cohesins are spatiotemporally regulated by the Scc2-Scc4 complex which facilitates cohesin loading onto chromatin at specific chromosomal sites. Over the last few years, much attention has been paid to cohesin and cohesin loader as it became clear that even minor disruptions of these complexes may lead to developmental disorders and cancers. Here we summarize recent developments in the structure of Scc2-Scc4 complex, cohesin loading process, and mediators that determine the Scc2-Scc4 binding patterns to chromatin.
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Affiliation(s)
- Ireneusz Litwin
- Institute of Experimental Biology, University of Wroclaw, 50-328, Wroclaw, Poland.
| | - Robert Wysocki
- Institute of Experimental Biology, University of Wroclaw, 50-328, Wroclaw, Poland
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13
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Pan D, Du Y, Ren Z, Chen Y, Li X, Wang J, Hu B. Radiation induces premature chromatid separation via the miR-142-3p/Bod1 pathway in carcinoma cells. Oncotarget 2018; 7:60432-60445. [PMID: 27527863 PMCID: PMC5312394 DOI: 10.18632/oncotarget.11080] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 07/26/2016] [Indexed: 12/24/2022] Open
Abstract
Radiation-induced genomic instability plays a vital role in carcinogenesis. Bod1 is required for proper chromosome biorientation, and Bod1 depletion increases premature chromatid separation. MiR-142-3p influences cell cycle progression and inhibits proliferation and invasion in cervical carcinoma cells. We found that radiation induced premature chromatid separation and altered miR-142-3p and Bod1 expression in 786-O and A549 cells. Overexpression of miR-142-3p increased premature chromatid separation and G2/M cell cycle arrest in 786-O cells by suppressing Bod1 expression. We also found that either overexpression of miR-142-3p or knockdown of Bod1 sensitized 786-O and A549 cells to X-ray radiation. Overexpression of Bod1 inhibited radiation- and miR-142-3p-induced premature chromatid separation and increased resistance to radiation in 786-O and A549 cells. Taken together, these results suggest that radiation alters miR-142-3p and Bod1 expression in carcinoma cells, and thus contributes to early stages of radiation-induced genomic instability. Combining ionizing radiation with epigenetic regulation may help improve cancer therapies.
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Affiliation(s)
- Dong Pan
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Yarong Du
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Zhenxin Ren
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Yaxiong Chen
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Xiaoman Li
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Jufang Wang
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Burong Hu
- Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences & Key Laboratory of Space Radiobiology of Gansu Province, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China.,Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences (RAD-X), Soochow University, Suzhou, Jiangsu, China
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14
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Ouimette JF, Rougeulle C, Veitia RA. Three-dimensional genome architecture in health and disease. Clin Genet 2018; 95:189-198. [PMID: 29377081 DOI: 10.1111/cge.13219] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 01/15/2018] [Accepted: 01/23/2018] [Indexed: 11/29/2022]
Abstract
More than a decade of massive DNA sequencing efforts have generated a large body of genomic, transcriptomic and epigenomic information that has provided a more and more detailed view of the functional elements and transactions within the human genome. Considerable efforts have also focused on linking these elements with one another by mapping their interactions and by establishing 3-dimensional (3D) genomic landscapes in various cell and tissue types. In parallel, multiple studies have associated genomic deletions, duplications and other rearrangements with human pathologies. In this review, we explore recent progresses that have allowed connecting disease-causing alterations with perturbations of the 3D genome organization.
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Affiliation(s)
- J-F Ouimette
- Epigenetics and Cell Fate Center, UMR7216 CNRS, Université Paris Diderot, Paris, France.,Université Paris Diderot, Paris, France
| | - C Rougeulle
- Epigenetics and Cell Fate Center, UMR7216 CNRS, Université Paris Diderot, Paris, France.,Université Paris Diderot, Paris, France
| | - R A Veitia
- Université Paris Diderot, Paris, France.,Institut Jacques Monod, Paris, France
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15
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Banerji R, Skibbens RV, Iovine MK. How many roads lead to cohesinopathies? Dev Dyn 2017; 246:881-888. [PMID: 28422453 DOI: 10.1002/dvdy.24510] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 03/10/2017] [Accepted: 04/11/2017] [Indexed: 12/16/2023] Open
Abstract
Genetic mapping studies reveal that mutations in cohesion pathways are responsible for multispectrum developmental abnormalities termed cohesinopathies. These include Roberts syndrome (RBS), Cornelia de Lange Syndrome (CdLS), and Warsaw Breakage Syndrome (WABS). The cohesinopathies are characterized by overlapping phenotypes ranging from craniofacial deformities, limb defects, and mental retardation. Though these syndromes share a similar suite of phenotypes and arise due to mutations in a common cohesion pathway, the underlying mechanisms are currently believed to be distinct. Defects in mitotic failure and apoptosis i.e. trans DNA tethering events are believed to be the underlying cause of RBS, whereas the underlying cause of CdLS is largely modeled as occurring through defects in transcriptional processes i.e. cis DNA tethering events. Here, we review recent findings described primarily in zebrafish, paired with additional studies in other model systems, including human patient cells, which challenge the notion that cohesinopathies represent separate syndromes. We highlight numerous studies that illustrate the utility of zebrafish to provide novel insights into the phenotypes, genes affected and the possible mechanisms underlying cohesinopathies. We propose that transcriptional deregulation is the predominant mechanism through which cohesinopathies arise. Developmental Dynamics 246:881-888, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Rajeswari Banerji
- Department of Biological Science, Lehigh University, Bethlehem, Pennsylvania
| | - Robert V Skibbens
- Department of Biological Science, Lehigh University, Bethlehem, Pennsylvania
| | - M Kathryn Iovine
- Department of Biological Science, Lehigh University, Bethlehem, Pennsylvania
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16
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Newkirk DA, Chen YY, Chien R, Zeng W, Biesinger J, Flowers E, Kawauchi S, Santos R, Calof AL, Lander AD, Xie X, Yokomori K. The effect of Nipped-B-like (Nipbl) haploinsufficiency on genome-wide cohesin binding and target gene expression: modeling Cornelia de Lange syndrome. Clin Epigenetics 2017; 9:89. [PMID: 28855971 PMCID: PMC5574093 DOI: 10.1186/s13148-017-0391-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 08/15/2017] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Cornelia de Lange syndrome (CdLS) is a multisystem developmental disorder frequently associated with heterozygous loss-of-function mutations of Nipped-B-like (NIPBL), the human homolog of Drosophila Nipped-B. NIPBL loads cohesin onto chromatin. Cohesin mediates sister chromatid cohesion important for mitosis but is also increasingly recognized as a regulator of gene expression. In CdLS patient cells and animal models, expression changes of multiple genes with little or no sister chromatid cohesion defect suggests that disruption of gene regulation underlies this disorder. However, the effect of NIPBL haploinsufficiency on cohesin binding, and how this relates to the clinical presentation of CdLS, has not been fully investigated. Nipbl haploinsufficiency causes CdLS-like phenotype in mice. We examined genome-wide cohesin binding and its relationship to gene expression using mouse embryonic fibroblasts (MEFs) from Nipbl+/- mice that recapitulate the CdLS phenotype. RESULTS We found a global decrease in cohesin binding, including at CCCTC-binding factor (CTCF) binding sites and repeat regions. Cohesin-bound genes were found to be enriched for histone H3 lysine 4 trimethylation (H3K4me3) at their promoters; were disproportionately downregulated in Nipbl mutant MEFs; and displayed evidence of reduced promoter-enhancer interaction. The results suggest that gene activation is the primary cohesin function sensitive to Nipbl reduction. Over 50% of significantly dysregulated transcripts in mutant MEFs come from cohesin target genes, including genes involved in adipogenesis that have been implicated in contributing to the CdLS phenotype. CONCLUSIONS Decreased cohesin binding at the gene regions is directly linked to disease-specific expression changes. Taken together, our Nipbl haploinsufficiency model allows us to analyze the dosage effect of cohesin loading on CdLS development.
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Affiliation(s)
- Daniel A. Newkirk
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
- Department of Computer Sciences, University of California, Irvine, CA 92697 USA
| | - Yen-Yun Chen
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
- Current address: ResearchDx Inc., 5 Mason, Irvine, CA 92618 USA
| | - Richard Chien
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
- Current address: Thermo Fisher Scientific, Inc., 180 Oyster Point Blvd South, San Francisco, CA 94080 USA
| | - Weihua Zeng
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
- Current address: Department of Developmental & Cell Biology, School of Biological Sciences, University of California, Irvine, CA 92697 USA
| | - Jacob Biesinger
- Department of Computer Sciences, University of California, Irvine, CA 92697 USA
- Current address: Verily Life Scienceds, 1600 Amphitheatre Pkwy, Mountain View, CA 94043 USA
| | - Ebony Flowers
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
- California State University Long Beach, Long Beach, CA 90840 USA
- Current address: UT Southwestern Medical Center, 5323 Harry Hines Blvd, NA8.124, Dallas, TX 75390 USA
| | - Shimako Kawauchi
- Department of Anatomy & Neurobiology, School of Medicine, University of California, Irvine, CA 92697 USA
| | - Rosaysela Santos
- Department of Anatomy & Neurobiology, School of Medicine, University of California, Irvine, CA 92697 USA
| | - Anne L. Calof
- Department of Anatomy & Neurobiology, School of Medicine, University of California, Irvine, CA 92697 USA
| | - Arthur D. Lander
- Department of Developmental & Cell Biology, School of Biological Sciences, University of California, Irvine, CA 92697 USA
| | - Xiaohui Xie
- Department of Computer Sciences, University of California, Irvine, CA 92697 USA
| | - Kyoko Yokomori
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697 USA
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Abstract
Acute Myeloid Leukemia (AML) is a hematologic malignancy with a poor prognosis. Recent genome-wide sequencing studies have identified frequent mutations in genes encoding members of the cohesin complex. Mutations in cohesin contribute to myeloid malignancies by conferring enhanced self-renewal of hematopoietic stem and progenitor cells but the mechanisms behind this phenotype have not been fully elucidated. Of note, cohesin mutations are highly prevalent in acute megakaryocytic leukemia associated with Down syndrome (DS-AMKL), where they occur in over half of patients. Evidence suggests that cohesin mutations alter gene expression through changes in chromatin accessibility and/or aberrant targeting of epigenetic complexes. In this review we discuss the pathogenic mechanisms by which cohesin mutations contribute to myeloid malignancies.
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Affiliation(s)
- Joseph B. Fisher
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
| | - Maureen McNulty
- Division of Hematology/Oncology, Northwestern University, Chicago, IL, USA
| | - Michael J. Burke
- Department of Pediatrics, Section of Hematology, Oncology, and Bone Marrow Transplantation, Medical College of Wisconsin, Milwaukee, WI, USA
| | - John D. Crispino
- Division of Hematology/Oncology, Northwestern University, Chicago, IL, USA
| | - Sridhar Rao
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, USA
- Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, WI, USA
- Department of Pediatrics, Section of Hematology, Oncology, and Bone Marrow Transplantation, Medical College of Wisconsin, Milwaukee, WI, USA
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18
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Izumi K. Disorders of Transcriptional Regulation: An Emerging Category of Multiple Malformation Syndromes. Mol Syndromol 2016; 7:262-273. [PMID: 27867341 DOI: 10.1159/000448747] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2016] [Indexed: 01/09/2023] Open
Abstract
Some genetic disorders caused by mutations in genes encoding components of the transcriptional machinery as well as proteins involved in epigenetic modification of the genome share many overlapping features, such as facial dysmorphisms, growth problems and developmental delay/intellectual disability. As a basis for some shared phenotypic characteristics in these syndromes, a similar transcriptome disturbance, characterized by global transcriptional dysregulation, is believed to play a major role. In this review article, a general overview of gene transcription is provided, and the current knowledge of the mechanisms underlying some disorders of transcriptional regulation, such as Rubinstein- Taybi, Coffin-Siris, Cornelia de Lange, and CHOPS syndromes, are discussed.
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Affiliation(s)
- Kosuke Izumi
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, Pa., USA
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19
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Cucco F, Musio A. Genome stability: What we have learned from cohesinopathies. AMERICAN JOURNAL OF MEDICAL GENETICS. PART C, SEMINARS IN MEDICAL GENETICS 2016; 172:171-8. [PMID: 27091086 DOI: 10.1002/ajmg.c.31492] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cohesin is a multiprotein complex involved in many DNA-related processes such as proper chromosome segregation, replication, transcription, and repair. Mutations in cohesin gene pathways are responsible for human diseases, collectively referred to as cohesinopathies. In addition, both cohesin gene expression dysregulation and mutations have been identified in cancer. Cohesinopathy cells are characterized by genome instability (GIN) visualized by a constellation of markers such as chromosome aneuploidies, chromosome aberrations, precocious sister chromatid separation, premature centromere separation, micronuclei formation, and sensitivity to genotoxic drugs. The emerging picture suggests that GIN observed in cohesinopathies may result from the synergistic effects of the multiple cohesin dysfunctions. © 2016 Wiley Periodicals, Inc.
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20
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Watrin E, Kaiser FJ, Wendt KS. Gene regulation and chromatin organization: relevance of cohesin mutations to human disease. Curr Opin Genet Dev 2016; 37:59-66. [PMID: 26821365 DOI: 10.1016/j.gde.2015.12.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 12/16/2015] [Accepted: 12/19/2015] [Indexed: 10/22/2022]
Abstract
Consistent with the diverse roles of the cohesin complex in chromosome biology, mutations in genes encoding cohesin and its regulators are found in different types of cancer and in developmental disorders such as Cornelia de Lange Syndrome. It is so far considered that the defects caused by these mutations result from altered function of cohesin in regulating gene expression during development. Chromatin conformation analyses have established the importance of cohesin for the architecture of developmental gene clusters and in vivo studies in mouse and zebrafish demonstrated how cohesin defects lead to gene misregulation and to malformations similar to the related human syndromes. Here we present our current knowledge on cohesin's involvement in gene expression, highlighting molecular and mechanistic consequences of pathogenic mutations in the Cornelia de Lange syndrome.
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Affiliation(s)
- Erwan Watrin
- Centre National de la Recherche Scientifique, UMR 6290, Rennes, France; Institut de Génétique et Développement de Rennes, Université de Rennes 1, SFR BIOSIT, Rennes, France
| | - Frank J Kaiser
- Sektion für Funktionelle Genetik am Institut für Humangenetik Lübeck, Universität zu Lübeck, Lübeck, Germany
| | - Kerstin S Wendt
- Department of Cell Biology, Erasmus MC, Rotterdam, The Netherlands.
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21
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Yuen KC, Xu B, Krantz ID, Gerton JL. NIPBL Controls RNA Biogenesis to Prevent Activation of the Stress Kinase PKR. Cell Rep 2015; 14:93-102. [PMID: 26725122 PMCID: PMC4904785 DOI: 10.1016/j.celrep.2015.12.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 10/27/2015] [Accepted: 11/23/2015] [Indexed: 12/30/2022] Open
Abstract
NIPBL, a cohesin loader, has been implicated in transcriptional control and genome organization. Mutations in NIPBL, cohesin, and its deacetylase HDAC8 result in Cornelia de Lange syndrome. We report activation of the RNA-sensing kinase PKR in human lymphoblastoid cell lines carrying NIPBL or HDAC8 mutations, but not SMC1A or SMC3 mutations. PKR activation can be triggered by unmodified RNAs. Gene expression profiles in NIPBL-deficient lymphoblastoid cells and mouse embryonic stem cells reveal lower expression of genes involved in RNA processing and modification. NIPBL mutant lymphoblastoid cells show reduced proliferation and protein synthesis with increased apoptosis, all of which are partially reversed by a PKR inhibitor. Non-coding RNAs from an NIPBL mutant line had less m6A modification and activated PKR activity in vitro. This study provides insight into the molecular pathology of Cornelia de Lange syndrome by establishing a relationship between NIPBL and HDAC8 mutations and PKR activation.
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Affiliation(s)
- Kobe C Yuen
- Stowers Institute for Medical Research (SIMR), 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Baoshan Xu
- Stowers Institute for Medical Research (SIMR), 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Ian D Krantz
- Children's Hospital of Philadelphia, Division of Human Genetics, 3615 Civic Center Boulevard, Philadelphia, PA 19104, USA
| | - Jennifer L Gerton
- Stowers Institute for Medical Research (SIMR), 1000 East 50(th) Street, Kansas City, MO 64110, USA; University of Kansas School of Medicine, Department of Biochemistry and Molecular Biology, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.
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22
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Pezzani L, Milani D, Tadini G. Intellectual Disability: When the Hypertrichosis Is a Clue. J Pediatr Genet 2015; 4:154-8. [PMID: 27617126 DOI: 10.1055/s-0035-1564442] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 06/17/2015] [Indexed: 01/18/2023]
Abstract
The skin and the central and peripheral nervous system both derive from the ectoderm ridge. Therefore, several syndromes characterized by the presence of intellectual disability (ID) can be associated with specific congenital cutaneous manifestations. In this review, we list some of the most frequent diseases characterized by the presence of ID associated with hirsutism, which might be an incentive for the clinicians to pay attention to the ectodermal annexes in patients with ID.
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Affiliation(s)
- Lidia Pezzani
- Pathology Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
| | - Donatella Milani
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
| | - Gianluca Tadini
- Pediatric Highly Intensive Care Unit, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy; Unit of Dermatology, Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy
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23
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Zakari M, Trimble Ross R, Peak A, Blanchette M, Seidel C, Gerton JL. The SMC Loader Scc2 Promotes ncRNA Biogenesis and Translational Fidelity. PLoS Genet 2015; 11:e1005308. [PMID: 26176819 PMCID: PMC4503661 DOI: 10.1371/journal.pgen.1005308] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Accepted: 05/28/2015] [Indexed: 11/18/2022] Open
Abstract
The Scc2-Scc4 complex is essential for loading the cohesin complex onto DNA. Cohesin has important roles in chromosome segregation, DSB repair, and chromosome condensation. Here we report that Scc2 is important for gene expression in budding yeast. Scc2 and the transcriptional regulator Paf1 collaborate to promote the production of Box H/ACA snoRNAs which guide pseudouridylation of RNAs including ribosomal RNA. Mutation of SCC2 was associated with defects in the production of ribosomal RNA, ribosome assembly, and splicing. While the scc2 mutant does not have a general defect in protein synthesis, it shows increased frameshifting and reduced cap-independent translation. These findings suggest Scc2 normally promotes a gene expression program that supports translational fidelity. We hypothesize that translational dysfunction may contribute to the human disorder Cornelia de Lange syndrome, which is caused by mutations in NIPBL, the human ortholog of SCC2.
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Affiliation(s)
- Musinu Zakari
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Universite Pierre et Marie Curie (Paris VI), Paris, France
| | - Rhonda Trimble Ross
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Allison Peak
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Marco Blanchette
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Chris Seidel
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
| | - Jennifer L. Gerton
- Stowers Institute for Medical Research, Kansas City, Missouri, United States of America
- Department of Biochemistry and Molecular Biology, University of Kansas School of Medicine, Kansas City, Kansas, United States of America
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24
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Chromosome structure deficiencies in MCPH1 syndrome. Chromosoma 2015; 124:491-501. [PMID: 25845520 DOI: 10.1007/s00412-015-0512-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 03/06/2015] [Accepted: 03/16/2015] [Indexed: 01/11/2023]
Abstract
Mutations in the MCPH1 gene result in primary microcephaly in combination with a unique cellular phenotype of defective chromosome condensation. MCPH1 patient cells display premature chromosome condensation in G2 phase of the cell cycle and delayed decondensation in early G1 phase, observable as an increased proportion of cells with prophase-like appearance. MCPH1 deficiency thus appears to uncouple the chromosome cycle from the coordinated series of events that take place during mitosis such as some phases of the centrosome cycle and nuclear envelope breakdown. Here, we provide a further characterization of the effects of MCPH1 loss-of-function on chromosome morphology. In comparison to healthy controls, chromosomes of MCPH1 patients are shorter and display a pronounced coiling of their central chromatid axes. In addition, a substantial fraction of metaphase chromosomes shows apparently unresolved chromatids with twisted appearance. The patient chromosomes also showed signs of defective centromeric cohesion, which become more apparent and pronounced after harsh hypotonic conditions. Taking together, the observed alterations indicate additional so far unknown functions of MCPH1 during chromosome shaping and dynamics.
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25
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Xu B, Sowa N, Cardenas ME, Gerton JL. L-leucine partially rescues translational and developmental defects associated with zebrafish models of Cornelia de Lange syndrome. Hum Mol Genet 2014; 24:1540-55. [PMID: 25378554 PMCID: PMC4351377 DOI: 10.1093/hmg/ddu565] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Cohesinopathies are human genetic disorders that include Cornelia de Lange syndrome (CdLS) and Roberts syndrome (RBS) and are characterized by defects in limb and craniofacial development as well as mental retardation. The developmental phenotypes of CdLS and other cohesinopathies suggest that mutations in the structure and regulation of the cohesin complex during embryogenesis interfere with gene regulation. In a previous project, we showed that RBS was associated with highly fragmented nucleoli and defects in both ribosome biogenesis and protein translation. l-leucine stimulation of the mTOR pathway partially rescued translation in human RBS cells and development in zebrafish models of RBS. In this study, we investigate protein translation in zebrafish models of CdLS. Our results show that phosphorylation of RPS6 as well as 4E-binding protein 1 (4EBP1) was reduced in nipbla/b, rad21 and smc3-morphant embryos, a pattern indicating reduced translation. Moreover, protein biosynthesis and rRNA production were decreased in the cohesin morphant embryo cells. l-leucine partly rescued protein synthesis and rRNA production in the cohesin morphants and partially restored phosphorylation of RPS6 and 4EBP1. Concomitantly, l-leucine treatment partially improved cohesinopathy embryo development including the formation of craniofacial cartilage. Interestingly, we observed that alpha-ketoisocaproate (α-KIC), which is a keto derivative of leucine, also partially rescued the development of rad21 and nipbla/b morphants by boosting mTOR-dependent translation. In summary, our results suggest that cohesinopathies are caused in part by defective protein synthesis, and stimulation of the mTOR pathway through l-leucine or its metabolite α-KIC can partially rescue development in zebrafish models for CdLS.
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Affiliation(s)
- Baoshan Xu
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA
| | - Nenja Sowa
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA, Medical Faculty, University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
| | - Maria E Cardenas
- Department of Molecular Genetics and Microbiology, Duke University, Durham, NC 27708, USA
| | - Jennifer L Gerton
- Stowers Institute for Medical Research, Kansas City, MO 64110, USA, Department of Biochemistry and Molecular Biology, University of Kansas School of Medicine, Kansas City, KS 66160, USA,
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26
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The maintenance of chromosome structure: positioning and functioning of SMC complexes. Nat Rev Mol Cell Biol 2014; 15:601-14. [PMID: 25145851 DOI: 10.1038/nrm3857] [Citation(s) in RCA: 163] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Structural maintenance of chromosomes (SMC) complexes, which in eukaryotic cells include cohesin, condensin and the Smc5/6 complex, are central regulators of chromosome dynamics and control sister chromatid cohesion, chromosome condensation, DNA replication, DNA repair and transcription. Even though the molecular mechanisms that lead to this large range of functions are still unclear, it has been established that the complexes execute their functions through their association with chromosomal DNA. A large set of data also indicates that SMC complexes work as intermolecular and intramolecular linkers of DNA. When combining these insights with results from ongoing analyses of their chromosomal binding, and how this interaction influences the structure and dynamics of chromosomes, a picture of how SMC complexes carry out their many functions starts to emerge.
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27
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Ansari M, Poke G, Ferry Q, Williamson K, Aldridge R, Meynert AM, Bengani H, Chan CY, Kayserili H, Avci S, Hennekam RCM, Lampe AK, Redeker E, Homfray T, Ross A, Falkenberg Smeland M, Mansour S, Parker MJ, Cook JA, Splitt M, Fisher RB, Fryer A, Magee AC, Wilkie A, Barnicoat A, Brady AF, Cooper NS, Mercer C, Deshpande C, Bennett CP, Pilz DT, Ruddy D, Cilliers D, Johnson DS, Josifova D, Rosser E, Thompson EM, Wakeling E, Kinning E, Stewart F, Flinter F, Girisha KM, Cox H, Firth HV, Kingston H, Wee JS, Hurst JA, Clayton-Smith J, Tolmie J, Vogt J, Tatton-Brown K, Chandler K, Prescott K, Wilson L, Behnam M, McEntagart M, Davidson R, Lynch SA, Sisodiya S, Mehta SG, McKee SA, Mohammed S, Holden S, Park SM, Holder SE, Harrison V, McConnell V, Lam WK, Green AJ, Donnai D, Bitner-Glindzicz M, Donnelly DE, Nellåker C, Taylor MS, FitzPatrick DR. Genetic heterogeneity in Cornelia de Lange syndrome (CdLS) and CdLS-like phenotypes with observed and predicted levels of mosaicism. J Med Genet 2014; 51:659-68. [PMID: 25125236 PMCID: PMC4173748 DOI: 10.1136/jmedgenet-2014-102573] [Citation(s) in RCA: 125] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Cornelia de Lange syndrome (CdLS) is a multisystem disorder with distinctive facial appearance, intellectual disability and growth failure as prominent features. Most individuals with typical CdLS have de novo heterozygous loss-of-function mutations in NIPBL with mosaic individuals representing a significant proportion. Mutations in other cohesin components, SMC1A, SMC3, HDAC8 and RAD21 cause less typical CdLS. METHODS We screened 163 affected individuals for coding region mutations in the known genes, 90 for genomic rearrangements, 19 for deep intronic variants in NIPBL and 5 had whole-exome sequencing. RESULTS Pathogenic mutations [including mosaic changes] were identified in: NIPBL 46 [3] (28.2%); SMC1A 5 [1] (3.1%); SMC3 5 [1] (3.1%); HDAC8 6 [0] (3.6%) and RAD21 1 [0] (0.6%). One individual had a de novo 1.3 Mb deletion of 1p36.3. Another had a 520 kb duplication of 12q13.13 encompassing ESPL1, encoding separase, an enzyme that cleaves the cohesin ring. Three de novo mutations were identified in ANKRD11 demonstrating a phenotypic overlap with KBG syndrome. To estimate the number of undetected mosaic cases we used recursive partitioning to identify discriminating features in the NIPBL-positive subgroup. Filtering of the mutation-negative group on these features classified at least 18% as 'NIPBL-like'. A computer composition of the average face of this NIPBL-like subgroup was also more typical in appearance than that of all others in the mutation-negative group supporting the existence of undetected mosaic cases. CONCLUSIONS Future diagnostic testing in 'mutation-negative' CdLS thus merits deeper sequencing of multiple DNA samples derived from different tissues.
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Affiliation(s)
- Morad Ansari
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Gemma Poke
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Quentin Ferry
- Visual Geometry Group, Department of Engineering Science, University of Oxford, Oxford, UK Medical Research Council Functional Genomics Unit, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Kathleen Williamson
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Roland Aldridge
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Alison M Meynert
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Hemant Bengani
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Cheng Yee Chan
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - Hülya Kayserili
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Sahin Avci
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Raoul C M Hennekam
- Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Anne K Lampe
- South East of Scotland Clinical Genetic Service, Molecular Medicine Centre, Western General Hospital, Edinburgh, UK
| | - Egbert Redeker
- Department of Clinical Genetics, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Tessa Homfray
- Medical Genetics Unit, St George's University of London, London, UK
| | - Alison Ross
- North of Scotland Regional Genetics Service, Clinical Genetics Centre, Aberdeen, UK
| | | | - Sahar Mansour
- Medical Genetics Unit, St George's University of London, London, UK
| | - Michael J Parker
- Sheffield Children's Hospital, NHS Foundation Trust, Sheffield, UK
| | | | - Miranda Splitt
- Northern Genetics Service, Newcastle upon Tyne Hospitals, Newcastle upon Tyne, UK
| | - Richard B Fisher
- Northern Genetics Service, Newcastle upon Tyne Hospitals, Newcastle upon Tyne, UK
| | - Alan Fryer
- Department of Clinical Genetics, Alder Hay Children's Hospital, Liverpool, UK
| | - Alex C Magee
- Northern Ireland Regional Genetics Service (NIRGS), Belfast City Hospital, Belfast, UK
| | - Andrew Wilkie
- Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - Angela Barnicoat
- Clinical Genetics Department, Great Ormond Street Hospital, London, UK
| | - Angela F Brady
- North West Thames Regional Genetics Service, Kennedy-Galton Centre, North West London Hospitals NHS Trust, Harrow, UK
| | - Nicola S Cooper
- West Midlands Regional Clinical Genetics Service, Birmingham Women's Hospital, West Midlands, UK
| | - Catherine Mercer
- Wessex Clinical Genetics Service, Princess Anne Hospital, Southampton, UK
| | - Charu Deshpande
- Department of Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | | | - Daniela T Pilz
- Institute of Medical Genetics, University Hospital of Wales, Cardiff, UK
| | - Deborah Ruddy
- Department of Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Deirdre Cilliers
- Department of Clinical Genetics, The Churchill Hospital Old Road, Oxford, UK
| | - Diana S Johnson
- Sheffield Children's Hospital, NHS Foundation Trust, Sheffield, UK
| | - Dragana Josifova
- Department of Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Elisabeth Rosser
- Clinical Genetics Department, Great Ormond Street Hospital, London, UK
| | - Elizabeth M Thompson
- SA Clinical Genetics Service, Women's & Children's Hospital, Adelaide, Australia Department of Paediatrics, University of Adelaide, Adelaide, Australia
| | - Emma Wakeling
- North West Thames Regional Genetics Service, Kennedy-Galton Centre, North West London Hospitals NHS Trust, Harrow, UK
| | - Esther Kinning
- West of Scotland Regional Genetics Service, Ferguson-Smith Centre for Clinical Genetics, Yorkhill Hospital, Glasgow, UK
| | - Fiona Stewart
- Northern Ireland Regional Genetics Service (NIRGS), Belfast City Hospital, Belfast, UK
| | - Frances Flinter
- Department of Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Katta M Girisha
- Department of Medical Genetics, Kasturba Medical College, Manipal University, Manipal, India
| | - Helen Cox
- West Midlands Regional Clinical Genetics Service, Birmingham Women's Hospital, West Midlands, UK
| | - Helen V Firth
- Department of Medical Genetics, Cambridge University Addenbrooke's Hospital, Cambridge, UK
| | - Helen Kingston
- Faculty of Medical and Human Sciences, Manchester Centre for Genomic Medicine, Institute of Human Development, University of Manchester, Manchester Academic Health Science Centre (MAHSC), Manchester, UK
| | - Jamie S Wee
- Department of Dermatology, Kingston Hospital NHS Trust, Surrey, UK
| | - Jane A Hurst
- Clinical Genetics Department, Great Ormond Street Hospital, London, UK
| | - Jill Clayton-Smith
- Faculty of Medical and Human Sciences, Manchester Centre for Genomic Medicine, Institute of Human Development, University of Manchester, Manchester Academic Health Science Centre (MAHSC), Manchester, UK
| | - John Tolmie
- West of Scotland Regional Genetics Service, Ferguson-Smith Centre for Clinical Genetics, Yorkhill Hospital, Glasgow, UK
| | - Julie Vogt
- West Midlands Regional Clinical Genetics Service, Birmingham Women's Hospital, West Midlands, UK
| | | | - Kate Chandler
- Faculty of Medical and Human Sciences, Manchester Centre for Genomic Medicine, Institute of Human Development, University of Manchester, Manchester Academic Health Science Centre (MAHSC), Manchester, UK
| | - Katrina Prescott
- Clinical Genetics, Yorkshire Regional Genetics Service, Leeds, UK
| | - Louise Wilson
- Clinical Genetics Department, Great Ormond Street Hospital, London, UK
| | - Mahdiyeh Behnam
- Medical Genetics Laboratory of Genome, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Rosemarie Davidson
- West of Scotland Regional Genetics Service, Ferguson-Smith Centre for Clinical Genetics, Yorkhill Hospital, Glasgow, UK
| | - Sally-Ann Lynch
- National Centre for Medical Genetics, Our Lady's Children's Hospital, Dublin 12, Ireland
| | - Sanjay Sisodiya
- Department of Clinical and Experimental Epilepsy, UCL Institute of Neurology, London, UK
| | - Sarju G Mehta
- Department of Medical Genetics, Cambridge University Addenbrooke's Hospital, Cambridge, UK
| | - Shane A McKee
- Northern Ireland Regional Genetics Service (NIRGS), Belfast City Hospital, Belfast, UK
| | - Shehla Mohammed
- Department of Genetics, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, UK
| | - Simon Holden
- Department of Medical Genetics, Cambridge University Addenbrooke's Hospital, Cambridge, UK
| | - Soo-Mi Park
- Department of Medical Genetics, Cambridge University Addenbrooke's Hospital, Cambridge, UK
| | - Susan E Holder
- North West Thames Regional Genetics Service, Kennedy-Galton Centre, North West London Hospitals NHS Trust, Harrow, UK
| | - Victoria Harrison
- Wessex Clinical Genetics Service, Princess Anne Hospital, Southampton, UK
| | - Vivienne McConnell
- Northern Ireland Regional Genetics Service (NIRGS), Belfast City Hospital, Belfast, UK
| | - Wayne K Lam
- South East of Scotland Clinical Genetic Service, Molecular Medicine Centre, Western General Hospital, Edinburgh, UK
| | - Andrew J Green
- National Centre for Medical Genetics, Our Lady's Children's Hospital, Dublin 12, Ireland School of Medicine and Medical Science, University College Dublin, Dublin 4, Ireland
| | - Dian Donnai
- Faculty of Medical and Human Sciences, Manchester Centre for Genomic Medicine, Institute of Human Development, University of Manchester, Manchester Academic Health Science Centre (MAHSC), Manchester, UK
| | - Maria Bitner-Glindzicz
- Clinical Genetics Department, Great Ormond Street Hospital, London, UK Genetics and Genomic Medicine Programme, UCL Institute of Child Health, London, UK
| | - Deirdre E Donnelly
- Northern Ireland Regional Genetics Service (NIRGS), Belfast City Hospital, Belfast, UK
| | - Christoffer Nellåker
- Medical Research Council Functional Genomics Unit, Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford, UK
| | - Martin S Taylor
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
| | - David R FitzPatrick
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK
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28
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Solomon DA, Kim JS, Waldman T. Cohesin gene mutations in tumorigenesis: from discovery to clinical significance. BMB Rep 2014; 47:299-310. [PMID: 24856830 PMCID: PMC4163871 DOI: 10.5483/bmbrep.2014.47.6.092] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Indexed: 12/30/2022] Open
Abstract
Cohesin is a multi-protein complex composed of four core subunits (SMC1A, SMC3, RAD21, and either STAG1 or STAG2) that is responsible for the cohesion of sister chromatids following DNA replication until its cleavage during mitosis thereby enabling faithful segregation of sister chromatids into two daughter cells. Recent cancer genomics analyses have discovered a high frequency of somatic mutations in the genes encoding the core cohesin subunits as well as cohesin regulatory factors (e.g. NIPBL, PDS5B, ESPL1) in a select subset of human tumors including glioblastoma, Ewing sarcoma, urothelial carcinoma, acute myeloid leukemia, and acute megakaryoblastic leukemia. Herein we review these studies including discussion of the functional significance of cohesin inactivation in tumorigenesis and potential therapeutic mechanisms to selectively target cancers harboring cohesin mutations.
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MESH Headings
- Carcinogenesis
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- Chromosomal Proteins, Non-Histone/genetics
- Chromosomal Proteins, Non-Histone/metabolism
- Humans
- Leukemia, Megakaryoblastic, Acute/genetics
- Leukemia, Megakaryoblastic, Acute/metabolism
- Leukemia, Megakaryoblastic, Acute/pathology
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Mutation
- Neoplasms/genetics
- Neoplasms/metabolism
- Neoplasms/pathology
- Protein Subunits/genetics
- Protein Subunits/metabolism
- Urologic Neoplasms/genetics
- Urologic Neoplasms/metabolism
- Urologic Neoplasms/pathology
- Cohesins
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Affiliation(s)
- David A. Solomon
- Department of Pathology, University of California, San Francisco, San Francisco, CA 94143, United States
| | - Jung-Sik Kim
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University School of Medicine, Washington, DC 20057, United States
| | - Todd Waldman
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University School of Medicine, Washington, DC 20057, United States
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29
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Ball AR, Chen YY, Yokomori K. Mechanisms of cohesin-mediated gene regulation and lessons learned from cohesinopathies. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1839:191-202. [PMID: 24269489 PMCID: PMC3951616 DOI: 10.1016/j.bbagrm.2013.11.002] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 11/09/2013] [Accepted: 11/14/2013] [Indexed: 12/16/2022]
Abstract
Cohesins are conserved and essential Structural Maintenance of Chromosomes (SMC) protein-containing complexes that physically interact with chromatin and modulate higher-order chromatin organization. Cohesins mediate sister chromatid cohesion and cellular long-distance chromatin interactions affecting genome maintenance and gene expression. Discoveries of mutations in cohesin's subunits and its regulator proteins in human developmental disorders, so-called "cohesinopathies," reveal crucial roles for cohesins in development and cellular growth and differentiation. In this review, we discuss the latest findings concerning cohesin's functions in higher-order chromatin architecture organization and gene regulation and new insight gained from studies of cohesinopathies. This article is part of a Special Issue entitled: Chromatin and epigenetic regulation of animal development.
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Affiliation(s)
- Alexander R Ball
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA
| | - Yen-Yun Chen
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA
| | - Kyoko Yokomori
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, CA 92697-1700, USA.
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30
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Abstract
Mitosis and meiosis are essential processes that occur during development. Throughout these processes, cohesion is required to keep the sister chromatids together until their separation at anaphase. Cohesion is created by multiprotein subunit complexes called cohesins. Although the subunits differ slightly in mitosis and meiosis, the canonical cohesin complex is composed of four subunits that are quite diverse. The cohesin complexes are also important for DNA repair, gene expression, development, and genome integrity. Here we provide an overview of the roles of cohesins during these different events as well as their roles in human health and disease, including the cohesinopathies. Although the exact roles and mechanisms of these proteins are still being elucidated, this review serves as a guide for the current knowledge of cohesins.
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Affiliation(s)
- Amanda S Brooker
- Department of Biochemistry and Molecular Biology, Drexel University College of Medicine, 245 N. 15th Street, MS 497, Philadelphia, PA, 19102, USA
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31
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Skibbens RV, Colquhoun JM, Green MJ, Molnar CA, Sin DN, Sullivan BJ, Tanzosh EE. Cohesinopathies of a feather flock together. PLoS Genet 2013; 9:e1004036. [PMID: 24367282 PMCID: PMC3868590 DOI: 10.1371/journal.pgen.1004036] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Roberts Syndrome (RBS) and Cornelia de Lange Syndrome (CdLS) are severe developmental maladies that present with nearly an identical suite of multi-spectrum birth defects. Not surprisingly, RBS and CdLS arise from mutations within a single pathway--here involving cohesion. Sister chromatid tethering reactions that comprise cohesion are required for high fidelity chromosome segregation, but cohesin tethers also regulate gene transcription, promote DNA repair, and impact DNA replication. Currently, RBS is thought to arise from elevated levels of apoptosis, mitotic failure, and limited progenitor cell proliferation, while CdLS is thought to arise, instead, from transcription dysregulation. Here, we review new information that implicates RBS gene mutations in altered transcription profiles. We propose that cohesin-dependent transcription dysregulation may extend to other developmental maladies; the diagnoses of which are complicated through multi-functional proteins that manifest a sliding scale of diverse and severe phenotypes. We further review evidence that cohesinopathies are more common than currently posited.
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Affiliation(s)
- Robert V. Skibbens
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Jennifer M. Colquhoun
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Megan J. Green
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
- Merck, Sharp & Dohme, West Point, Pennsylvania, United States of America
| | - Cody A. Molnar
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Danielle N. Sin
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Brian J. Sullivan
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
| | - Eden E. Tanzosh
- Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania, United States of America
- Janssen R&D, LLC, Raritan, New Jersey, United States of America
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32
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Enervald E, Du L, Visnes T, Björkman A, Lindgren E, Wincent J, Borck G, Colleaux L, Cormier-Daire V, van Gent DC, Pie J, Puisac B, de Miranda NFCC, Kracker S, Hammarström L, de Villartay JP, Durandy A, Schoumans J, Ström L, Pan-Hammarström Q. A regulatory role for the cohesin loader NIPBL in nonhomologous end joining during immunoglobulin class switch recombination. J Exp Med 2013; 210:2503-13. [PMID: 24145515 PMCID: PMC3832922 DOI: 10.1084/jem.20130168] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 09/30/2013] [Indexed: 11/30/2022] Open
Abstract
DNA double strand breaks (DSBs) are mainly repaired via homologous recombination (HR) or nonhomologous end joining (NHEJ). These breaks pose severe threats to genome integrity but can also be necessary intermediates of normal cellular processes such as immunoglobulin class switch recombination (CSR). During CSR, DSBs are produced in the G1 phase of the cell cycle and are repaired by the classical NHEJ machinery. By studying B lymphocytes derived from patients with Cornelia de Lange Syndrome, we observed a strong correlation between heterozygous loss-of-function mutations in the gene encoding the cohesin loading protein NIPBL and a shift toward the use of an alternative, microhomology-based end joining during CSR. Furthermore, the early recruitment of 53BP1 to DSBs was reduced in the NIPBL-deficient patient cells. Association of NIPBL deficiency and impaired NHEJ was also observed in a plasmid-based end-joining assay and a yeast model system. Our results suggest that NIPBL plays an important and evolutionarily conserved role in NHEJ, in addition to its canonical function in sister chromatid cohesion and its recently suggested function in HR.
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Affiliation(s)
- Elin Enervald
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Likun Du
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Torkild Visnes
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Andrea Björkman
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Emma Lindgren
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Josephine Wincent
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Guntram Borck
- Department of Genetics, Institut National de la Santé et de la Recherche Médicale U781, Hospital Necker, 75743 Paris, France
- Institute of Human Genetics, University of Ulm, 89081 Ulm, Germany
| | - Laurence Colleaux
- Department of Genetics, Institut National de la Santé et de la Recherche Médicale U781, Hospital Necker, 75743 Paris, France
| | - Valerie Cormier-Daire
- Department of Genetics, Institut National de la Santé et de la Recherche Médicale U781, Hospital Necker, 75743 Paris, France
| | - Dik C. van Gent
- Department of Cell Biology and Genetics, Cancer Genomics Center, Erasmus Medical Center, 3000 CA Rotterdam, The Netherlands
| | - Juan Pie
- Unit of Clinical Genetics and functional Genomics, Medical Faculty, Zaragosa University, 50009 Zaragoza, Spain
| | - Beatriz Puisac
- Unit of Clinical Genetics and functional Genomics, Medical Faculty, Zaragosa University, 50009 Zaragoza, Spain
| | - Noel FCC de Miranda
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Sven Kracker
- National Institutes of Health and Medical Research INSERM U768, Hopital Necker Enfants Malades and Medical Faculty, Descartes-Sorbone Paris Cité University of Paris, 75743 Paris, France
| | - Lennart Hammarström
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Jean-Pierre de Villartay
- Université Paris-Descartes, Faculté de Médicine René Descartes, Site Necker, Institut Fédératif de Recherche, F-71015 Paris, France
| | - Anne Durandy
- National Institutes of Health and Medical Research INSERM U768, Hopital Necker Enfants Malades and Medical Faculty, Descartes-Sorbone Paris Cité University of Paris, 75743 Paris, France
| | - Jacqueline Schoumans
- Department of Medical Genetics Cancer Cytogenetic Unit, University Hospital of Lausanne, 1011 Lausanne, Switzerland
| | - Lena Ström
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Qiang Pan-Hammarström
- Department of Cell and Molecular Biology, Department of Laboratory Medicine, Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 77 Stockholm, Sweden
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33
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Abstract
The cohesin complex, named for its key role in sister chromatid cohesion, also plays critical roles in gene regulation and DNA repair. It performs all three functions in single cell eukaryotes such as yeasts, and in higher organisms such as man. Minor disruption of cohesin function has significant consequences for human development, even in the absence of measurable effects on chromatid cohesion or chromosome segregation. Here we survey the roles of cohesin in gene regulation and DNA repair, and how these functions vary from yeast to man.
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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, USA.
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34
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Seitan VC, Merkenschlager M. Cohesin and chromatin organisation. Curr Opin Genet Dev 2012; 22:93-100. [PMID: 22155130 DOI: 10.1016/j.gde.2011.11.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 11/10/2011] [Indexed: 01/20/2023]
Abstract
Cohesin defines the topology of chromosomes in mitosis and meiosis by holding sister chromatids together; more recently a role for cohesin in chromatin organisation and gene expression in interphase has emerged.
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Affiliation(s)
- Vlad C Seitan
- Lymphocyte Development Group, MRC Clinical Sciences Centre, Imperial College London, London W12 0NN, UK.
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35
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Mannini L, Menga S, Tonelli A, Zanotti S, Bassi MT, Magnani C, Musio A. SMC1A codon 496 mutations affect the cellular response to genotoxic treatments. Am J Med Genet A 2012; 158A:224-8. [PMID: 22140011 DOI: 10.1002/ajmg.a.34384] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Accepted: 10/24/2011] [Indexed: 01/01/2023]
Abstract
Cornelia de Lange syndrome is a pleiotropic developmental syndrome characterized by growth and cognitive impairment, facial dysmorphic features, limb anomalies, and other malformations. Mutations in core cohesin genes SMC1A and SMC3, and the cohesin regulatory gene, NIPBL, have been identified in Cornelia de Lange syndrome probands. Patients with NIPBL mutations have more severe phenotypes when compared to those with mutations in SMC1A or SMC3. To date, 26 distinct SMC1A mutations have been identified in patients with Cornelia de Lange syndrome. Here, we describe a 3-year-old girl with psychomotor and cognitive impairment, mild facial dysmorphic features but no limb anomaly, heterozygous for a c.1487G>A mutation in SMC1A which predicts p.Arg496His. We show that this mutation leads to an impairment of the cellular response to genotoxic treatments.
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Affiliation(s)
- Linda Mannini
- Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche, Pisa, Italy
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36
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Abstract
Genome instability is a hallmark of cancer cells and how it arises is still not completely understood. Correct chromosome segregation is a pre-requisite for preserving genome integrity. Cohesin helps to ensure faithful chromosome segregation during cell cycle, however, much evidence regarding its functions have come to light over the last few years and suggest that cohesin plays multiple roles in the maintenance of genome stability. Here we review our rapidly increasing knowledge on the involvement of cohesin pathway in genome stability and cancer.
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Affiliation(s)
- Linda Mannini
- Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Richerche, Pisa, Italy
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37
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Chien R, Zeng W, Ball AR, Yokomori K. Cohesin: a critical chromatin organizer in mammalian gene regulation. Biochem Cell Biol 2011; 89:445-58. [PMID: 21851156 PMCID: PMC4056987 DOI: 10.1139/o11-039] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Cohesins are evolutionarily conserved essential multi-protein complexes that are important for higher-order chromatin organization. They play pivotal roles in the maintenance of genome integrity through mitotic chromosome regulation, DNA repair and replication, as well as gene regulation critical for proper development and cellular differentiation. In this review, we will discuss the multifaceted functions of mammalian cohesins and their apparent functional hierarchy in the cell, with particular focus on their actions in gene regulation and their relevance to human developmental disorders.
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Affiliation(s)
- Richard Chien
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, California 92697-1700, USA
| | - Weihua Zeng
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, California 92697-1700, USA
| | - Alexander R. Ball
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, California 92697-1700, USA
| | - Kyoko Yokomori
- Department of Biological Chemistry, School of Medicine, University of California, Irvine, California 92697-1700, USA
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38
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Isolated NIBPL missense mutations that cause Cornelia de Lange syndrome alter MAU2 interaction. Eur J Hum Genet 2011; 20:271-6. [PMID: 21934712 DOI: 10.1038/ejhg.2011.175] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Cornelia de Lange syndrome (CdLS; or Brachmann-de Lange syndrome) is a dominantly inherited congenital malformation disorder with features that include characteristic facies, cognitive delays, growth retardation and limb anomalies. Mutations in nearly 60% of CdLS patients have been identified in NIPBL, which encodes a regulator of the sister chromatid cohesion complex. NIPBL, also known as delangin, is a homolog of yeast and amphibian Scc2 and C. elegans PQN-85. Although the exact mechanism of NIPBL function in sister chromatid cohesion is unclear, in vivo yeast and C. elegans experiments and in vitro vertebrate cell experiments have demonstrated that NIPBL/Scc2 functionally interacts with the MAU2/Scc4 protein to initiate loading of cohesin onto chromatin. To test the significance of this model in the clinical setting of CdLS, we fine-mapped the NIBPL-MAU2 interaction domain and tested the functional significance of missense mutations and variants in NIPBL and MAU2 identified in these minimal domains in a cohort of patients with CdLS. We demonstrate that specific novel mutations at the N-terminus of the MAU2-interacting domain of NIBPL result in markedly reduced MAU2 binding, although we appreciate no consistent clinical difference in the small group of patients with these mutations. These data suggest that factors in addition to MAU2 are essential in determining the clinical features and severity of CdLS.
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39
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Shimura M, Toyoda Y, Iijima K, Kinomoto M, Tokunaga K, Yoda K, Yanagida M, Sata T, Ishizaka Y. Epigenetic displacement of HP1 from heterochromatin by HIV-1 Vpr causes premature sister chromatid separation. J Cell Biol 2011; 194:721-35. [PMID: 21875947 PMCID: PMC3171121 DOI: 10.1083/jcb.201010118] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2010] [Accepted: 08/03/2011] [Indexed: 11/22/2022] Open
Abstract
Although pericentromeric heterochromatin is essential for chromosome segregation, its role in humans remains controversial. Dissecting the function of HIV-1-encoded Vpr, we unraveled important properties of heterochromatin during chromosome segregation. In Vpr-expressing cells, hRad21, hSgo1, and hMis12, which are crucial for proper chromosome segregation, were displaced from the centromeres of mitotic chromosomes, resulting in premature chromatid separation (PCS). Interestingly, Vpr displaced heterochromatin protein 1-α (HP1-α) and HP1-γ from chromatin. RNA interference (RNAi) experiments revealed that down-regulation of HP1-α and/or HP1-γ induced PCS, concomitant with the displacement of hRad21. Notably, Vpr stimulated the acetylation of histone H3, whereas p300 RNAi attenuated the Vpr-induced displacement of HP1-α and PCS. Furthermore, Vpr bound to p300 that was present in insoluble regions of the nucleus, suggesting that Vpr aberrantly recruits the histone acetyltransferase activity of p300 to chromatin, displaces HP1-α, and causes chromatid cohesion defects. Our study reveals for the first time centromere cohesion impairment resulting from epigenetic disruption of higher-order structures of heterochromatin by a viral pathogen.
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Affiliation(s)
- Mari Shimura
- Department of Intractable Diseases, Research Institute, National Center for Global Health and Medicine, Shinjuku, Tokyo 162-8655, Japan.
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40
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Lin S, Ferguson-Smith AC, Schultz RM, Bartolomei MS. Nonallelic transcriptional roles of CTCF and cohesins at imprinted loci. Mol Cell Biol 2011; 31:3094-104. [PMID: 21628529 PMCID: PMC3147605 DOI: 10.1128/mcb.01449-10] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 01/29/2011] [Accepted: 05/17/2011] [Indexed: 11/20/2022] Open
Abstract
The cohesin complex holds sister chromatids together and is essential for chromosome segregation. Recently, cohesins have been implicated in transcriptional regulation and insulation through genome-wide colocalization with the insulator protein CTCF, including involvement at the imprinted H19/Igf2 locus. CTCF binds to multiple imprinted loci and is required for proper imprinted expression at the H19/Igf2 locus. Here we report that cohesins colocalize with CTCF at two additional imprinted loci, the Dlk1-Dio3 and the Kcnq1/Kcnq1ot1 loci. Similar to the H19/Igf2 locus, CTCF and cohesins preferentially bind to the Gtl2 differentially methylated region (DMR) on the unmethylated maternal allele. To determine the functional importance of the binding of CTCF and cohesins at the three imprinted loci, CTCF and cohesins were depleted in mouse embryonic fibroblast cells. The monoallelic expression of imprinted genes at these three loci was maintained. However, mRNA levels for these genes were typically increased; for H19 and Igf2 the increased level of expression was independent of the CTCF-binding sites in the imprinting control region. Results of these experiments demonstrate an unappreciated role for CTCF and cohesins in the repression of imprinted genes in somatic cells.
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Affiliation(s)
- Shu Lin
- Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Anne C. Ferguson-Smith
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge CB2 3EG, United Kingdom
| | - Richard M. Schultz
- Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Marisa S. Bartolomei
- Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
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Elizondo LI, Jafar-Nejad P, Clewing JM, Boerkoel CF. Gene clusters, molecular evolution and disease: a speculation. Curr Genomics 2011; 10:64-75. [PMID: 19721813 PMCID: PMC2699835 DOI: 10.2174/138920209787581271] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 12/20/2008] [Accepted: 12/21/2008] [Indexed: 01/10/2023] Open
Abstract
Traditionally eukaryotic genes are considered independently expressed under the control of their promoters and cis-regulatory domains. However, recent studies in worms, flies, mice and humans have shown that genes co-habiting a chromatin domain or “genomic neighborhood” are frequently co-expressed. Often these co-expressed genes neither constitute part of an operon nor function within the same biological pathway. The mechanisms underlying the partitioning of the genome into transcriptional genomic neighborhoods are poorly defined. However, cross-species analyses find that the linkage among the co-expressed genes of these clusters is significantly conserved and that the expression patterns of genes within clusters have coevolved with the clusters. Such selection could be mediated by chromatin interactions with the nuclear matrix and long-range remodeling of chromatin structure. In the context of human disease, we propose that dysregulation of gene expression across genomic neighborhoods will cause highly pleiotropic diseases. Candidate genomic neighborhood diseases include the nuclear laminopathies, chromosomal translocations and genomic instability disorders, imprinting disorders of errant insulator function, syndromes from impaired cohesin complex assembly, as well as diseases of global covalent histone modifications and DNA methylation. The alteration of transcriptional genomic neighborhoods provides an exciting and novel model for studying epigenetic alterations as quantitative traits in complex common human diseases.
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Robb EA, Gitter CL, Cheng HH, Delany ME. Chromosomal mapping and candidate gene discovery of chicken developmental mutants and genome-wide variation analysis of MHC congenics. ACTA ACUST UNITED AC 2011; 102:141-56. [PMID: 21273214 DOI: 10.1093/jhered/esq122] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The chicken has been widely used in experimental research given its importance to agriculture and its utility as a model for vertebrate biology and biomedical pursuits for over 100 years. Herein we used advanced technologies to investigate the genomic characteristics of specialized chicken congenic genetic resources developed on a highly inbred background. An Illumina 3K chicken single nucleotide polymorphism (SNP) array was utilized to study variation within and among major histocompatibility complex (MHC)-congenic lines as well as investigate line-specific genomic diversity, inbreeding coefficients, and MHC B haplotype-specific GGA 16 SNP profiles. We also investigated developmental mutant-congenic lines to map a number of single-gene mutations using both the Illumina 3K array and a recently developed Illumina 60K chicken SNP array. In addition to identifying the chromosomes and specific subregions, the mapping results affirmed prior analyses indicating recessive or dominant and autosomal or sex chromosome modes of inheritance. Priority candidate genes are described for each mutation based on association with similar phenotypes in other vertebrates. These single-gene mutations provide a means of studying amniote development and in particular serve as invaluable biomedical models for similar malformations found in human.
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Affiliation(s)
- Elizabeth A Robb
- Department of Animal Science, University of California, Davis, CA 95616, USA
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Ratajska M, Wierzba J, Pehlivan D, Xia Z, Brundage EK, Cheung SW, Stankiewicz P, Lupski JR, Limon J. Cornelia de Lange syndrome case due to genomic rearrangements including NIPBL. Eur J Med Genet 2010; 53:378-82. [PMID: 20727427 DOI: 10.1016/j.ejmg.2010.08.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Accepted: 08/06/2010] [Indexed: 10/19/2022]
Abstract
Cornelia de Lange syndrome (CdLS) is a rare multisystem congenital anomaly disorder characterized by growth and developmental delay, distinctive facial dysmorphism, limb malformations and multiple organ defects. Approximately 60-65% of the CdLS subjects have mutation in one of three cohesin proteins, a main regulator of cohesin-associated protein, NIPBL, and two components of the cohesin ring structure SMC1A and SMC3. A prominent role for cohesin is to control chromosome segregation during cell divisions. We have performed MLPA analysis in a group of 11 children with the CdLS but without identifiable point mutations in the NIPBL and SMC1A genes. In a single patient, we identified a large deletion encompassing exons 35 to 47 of the NIPBL gene. Our finding was validated by aCGH and further characterized by long-range PCR and DNA sequencing of the breakpoint junction.
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Affiliation(s)
- Magdalena Ratajska
- Department of Biology and Genetics, Medical University of Gdansk, Poland
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Pié J, Gil-Rodríguez MC, Ciero M, López-Viñas E, Ribate MP, Arnedo M, Deardorff MA, Puisac B, Legarreta J, de Karam JC, Rubio E, Bueno I, Baldellou A, Calvo MT, Casals N, Olivares JL, Losada A, Hegardt FG, Krantz ID, Gómez-Puertas P, Ramos FJ. Mutations and variants in the cohesion factor genes NIPBL, SMC1A, and SMC3 in a cohort of 30 unrelated patients with Cornelia de Lange syndrome. Am J Med Genet A 2010; 152A:924-9. [PMID: 20358602 DOI: 10.1002/ajmg.a.33348] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cornelia de Lange syndrome (CdLS) manifests facial dysmorphic features, growth and cognitive impairment, and limb malformations. Mutations in three genes (NIPBL, SMC1A, and SMC3) of the cohesin complex and its regulators have been found in affected patients. Here, we present clinical and molecular characterization of 30 unrelated patients with CdLS. Eleven patients had mutations in NIPBL (37%) and three patients had mutations in SMC1A (10%), giving an overall rate of mutations of 47%. Several patients shared the same mutation in NIPBL (p.R827GfsX2) but had variable phenotypes, indicating the influence of modifiers in CdLS. Patients with NIPBL mutations had a more severe phenotype than those with mutations in SMC1A or those without identified mutations. However, a high incidence of palate defects was noted in patients with SMC1A mutations. In addition, we observed a similar phenotype in both male and female patients with SMC1A mutations. Finally, we report the first patient with an SMC1A mutation and the Sandifer complex.
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Affiliation(s)
- Juan Pié
- Laboratory of Clinical Genetics and Functional Genomics, Department of Pharmacology, Medical School, University of Zaragoza, Zaragoza, Spain.
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Mannini L, Menga S, Musio A. The expanding universe of cohesin functions: a new genome stability caretaker involved in human disease and cancer. Hum Mutat 2010; 31:623-30. [PMID: 20513141 DOI: 10.1002/humu.21252] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cohesin is responsible for sister chromatid cohesion, ensuring the correct chromosome segregation. Beyond this role, cohesin and regulatory cohesin genes seem to play a role in preserving genome stability and gene transcription regulation. DNA damage is thought to be a major culprit for many human diseases, including cancer. Our present knowledge of the molecular basis underlying genome instability is extremely limited. Mutations in cohesin genes cause human diseases such as Cornelia de Lange syndrome and Roberts syndrome/SC phocomelia, and all the cell lines derived from affected patients show genome instability. Cohesin mutations have also been identified in colorectal cancer. Here, we will discuss the human disorders caused by alterations of cohesin function, with emphasis on the emerging role of cohesin as a genome stability caretaker.
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Affiliation(s)
- Linda Mannini
- Istituto di Tecnologie Biomediche, Consiglio Nazionale delle Ricerche, Pisa, Italy
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Schmidt D, Schwalie PC, Ross-Innes CS, Hurtado A, Brown GD, Carroll JS, Flicek P, Odom DT. A CTCF-independent role for cohesin in tissue-specific transcription. Genome Res 2010; 20:578-88. [PMID: 20219941 PMCID: PMC2860160 DOI: 10.1101/gr.100479.109] [Citation(s) in RCA: 295] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Accepted: 03/08/2010] [Indexed: 12/30/2022]
Abstract
The cohesin protein complex holds sister chromatids in dividing cells together and is essential for chromosome segregation. Recently, cohesin has been implicated in mediating transcriptional insulation, via its interactions with CTCF. Here, we show in different cell types that cohesin functionally behaves as a tissue-specific transcriptional regulator, independent of CTCF binding. By performing matched genome-wide binding assays (ChIP-seq) in human breast cancer cells (MCF-7), we discovered thousands of genomic sites that share cohesin and estrogen receptor alpha (ER) yet lack CTCF binding. By use of human hepatocellular carcinoma cells (HepG2), we found that liver-specific transcription factors colocalize with cohesin independently of CTCF at liver-specific targets that are distinct from those found in breast cancer cells. Furthermore, estrogen-regulated genes are preferentially bound by both ER and cohesin, and functionally, the silencing of cohesin caused aberrant re-entry of breast cancer cells into cell cycle after hormone treatment. We combined chromosomal interaction data in MCF-7 cells with our cohesin binding data to show that cohesin is highly enriched at ER-bound regions that capture inter-chromosomal loop anchors. Together, our data show that cohesin cobinds across the genome with transcription factors independently of CTCF, plays a functional role in estrogen-regulated transcription, and may help to mediate tissue-specific transcriptional responses via long-range chromosomal interactions.
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Affiliation(s)
- Dominic Schmidt
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
| | - Petra C. Schwalie
- European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, United Kingdom
| | - Caryn S. Ross-Innes
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
| | - Antoni Hurtado
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
| | - Gordon D. Brown
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
| | - Jason S. Carroll
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
| | - Paul Flicek
- European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, United Kingdom
| | - Duncan T. Odom
- Cancer Research UK, Cambridge Research Institute, Li Ka Shing Centre, Cambridge CB2 0RE, United Kingdom
- Department of Oncology, Hutchison/MRC Research Centre, Cambridge CB2 0XZ, United Kingdom
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Bose T, Gerton JL. Cohesinopathies, gene expression, and chromatin organization. J Cell Biol 2010; 189:201-10. [PMID: 20404106 PMCID: PMC2856913 DOI: 10.1083/jcb.200912129] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Accepted: 03/31/2010] [Indexed: 11/22/2022] Open
Abstract
The cohesin protein complex is best known for its role in sister chromatid cohesion, which is crucial for accurate chromosome segregation. Mutations in cohesin proteins or their regulators have been associated with human diseases (termed cohesinopathies). The developmental defects observed in these diseases indicate a role for cohesin in gene regulation distinct from its role in chromosome segregation. In mammalian cells, cohesin stably interacts with specific chromosomal sites and colocalizes with CTCF, a protein that promotes long-range DNA interactions, implying a role for cohesin in genome organization. Moreover, cohesin defects compromise the subnuclear position of chromatin. Therefore, defects in the cohesin network that alter gene expression and genome organization may underlie cohesinopathies.
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Affiliation(s)
- Tania Bose
- Stowers Institute for Medical Research, Kansas City, MO 64110
| | - Jennifer L. Gerton
- Stowers Institute for Medical Research, Kansas City, MO 64110
- Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS 66160
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Abstract
Chromosome cohesion is the term used to describe the cellular process in which sister chromatids are held together from the time of their replication until the time of separation at the metaphase to anaphase transition. In this capacity, chromosome cohesion, especially at centromeric regions, is essential for chromosome segregation. However, cohesion of noncentromeric DNA sequences has been shown to occur during double-strand break (DSB) repair and the transcriptional regulation of genes. Cohesion for the purposes of accurate chromosome segregation, DSB repair, and gene regulation are all achieved through a similar network of proteins, but cohesion for each purpose may be regulated differently. In this review, we focus on recent developments regarding the regulation of this multipurpose network for tying DNA sequences together. In particular, regulation via effectors and posttranslational modifications are reviewed. A picture is emerging in which complex regulatory networks are capable of differential regulation of cohesion in various contexts.
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Affiliation(s)
- Bo Xiong
- Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA.
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The importance of chromosome studies in Roberts syndrome/SC phocomelia and other cohesinopathies. Eur J Med Genet 2009; 53:40-4. [PMID: 19878742 DOI: 10.1016/j.ejmg.2009.10.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Accepted: 10/22/2009] [Indexed: 11/23/2022]
Abstract
Roberts syndrome/SC phocomelia is a rare, autosomal recessive syndrome characterised by pre- and postnatal growth retardation, microcephaly, craniofacial anomalies, mental retardation, and tetraphocomelia in varying degrees of severity. The clinical diagnosis can be challenging in phenotypically mild cases. In the extremely mild case presented here, specific mitotic abnormalities were detected and proved to be very helpful, since Roberts syndrome/SC phocomelia could be diagnosed after finding premature centromere separation and somatic aneuploidy at routine karyotyping. We discuss these and other mitotic cytogenetic abnormalities that can be of significant diagnostic importance, but which will be missed if only array studies are performed. We also discuss the difference between premature centromere separation and premature (sister) chromatid separation.
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