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  1. Article: The ChAHP Complex Counteracts Chromatin Looping at CTCF Sites that Emerged from SINE Expansions in Mouse

    Kaaij, Lucas J.T / Bühler, Marc / de Wit, Elzo / Mohn, Fabio / van der Weide, Robin H

    Cell. 2019 Sept. 05, v. 178, no. 6

    2019  

    Abstract: CCCTC-binding factor (CTCF) and cohesin are key players in three-dimensional chromatin organization. The topologically associating domains (TADs) demarcated by CTCF are remarkably well conserved between species, although genome-wide CTCF binding has ... ...

    Abstract CCCTC-binding factor (CTCF) and cohesin are key players in three-dimensional chromatin organization. The topologically associating domains (TADs) demarcated by CTCF are remarkably well conserved between species, although genome-wide CTCF binding has diverged substantially following transposon-mediated motif expansions. Therefore, the CTCF consensus motif poorly predicts TADs, and additional factors must modulate CTCF binding and subsequent TAD formation. Here, we demonstrate that the ChAHP complex (CHD4, ADNP, HP1) competes with CTCF for a common set of binding motifs. In Adnp knockout cells, novel insulated regions are formed at sites normally bound by ChAHP, whereas proximal canonical boundaries are weakened. These data reveal that CTCF-mediated loop formation is modulated by a distinct zinc-finger protein complex. Strikingly, ChAHP-bound loci are mainly situated within less diverged SINE B2 transposable elements. This implicates ChAHP in maintenance of evolutionarily conserved spatial chromatin organization by buffering novel CTCF binding sites that emerged through SINE expansions.
    Keywords binding sites ; chromatin ; consensus sequence ; loci ; mice ; transposons ; zinc finger motif
    Language English
    Dates of publication 2019-0905
    Size p. 1437-1451.e14.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 187009-9
    ISSN 1097-4172 ; 0092-8674
    ISSN (online) 1097-4172
    ISSN 0092-8674
    DOI 10.1016/j.cell.2019.08.007
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Systemic Loss and Gain of Chromatin Architecture throughout Zebrafish Development.

    Kaaij, Lucas J T / van der Weide, Robin H / Ketting, René F / de Wit, Elzo

    Cell reports

    2018  Volume 24, Issue 1, Page(s) 1–10.e4

    Abstract: The spatial organization of chromosomes is critical in establishing gene expression programs. We generated in situ Hi-C maps throughout zebrafish development to gain insight into higher-order chromatin organization and dynamics. Zebrafish chromosomes ... ...

    Abstract The spatial organization of chromosomes is critical in establishing gene expression programs. We generated in situ Hi-C maps throughout zebrafish development to gain insight into higher-order chromatin organization and dynamics. Zebrafish chromosomes segregate in active and inactive chromatin (A/B compartments), which are further organized into topologically associating domains (TADs). Zebrafish A/B compartments and TADs have genomic features similar to those of their mammalian counterparts, including evolutionary conservation and enrichment of CTCF binding sites at TAD borders. At the earliest time point, when there is no zygotic transcription, the genome is highly structured. After zygotic genome activation (ZGA), the genome loses structural features, which are re-established throughout early development. Despite the absence of structural features, we see clustering of super-enhancers in the 3D genome. Our results provide insight into vertebrate genome organization and demonstrate that the developing zebrafish embryo is a powerful model system to study the dynamics of nuclear organization.
    MeSH term(s) Animals ; Chromatin/metabolism ; Embryonic Development/genetics ; Enhancer Elements, Genetic/genetics ; Epigenomics ; Genome ; Histone Code ; Zebrafish/embryology ; Zebrafish/genetics
    Chemical Substances Chromatin
    Language English
    Publishing date 2018-08-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2018.06.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Systemic Loss and Gain of Chromatin Architecture throughout Zebrafish Development

    Lucas J.T. Kaaij / Robin H. van der Weide / René F. Ketting / Elzo de Wit

    Cell Reports, Vol 24, Iss 1, Pp 1-10.e

    2018  Volume 4

    Abstract: ... organize their genome? Kaaij et al. show that, early in development, when there is no transcription ...

    Abstract Summary: The spatial organization of chromosomes is critical in establishing gene expression programs. We generated in situ Hi-C maps throughout zebrafish development to gain insight into higher-order chromatin organization and dynamics. Zebrafish chromosomes segregate in active and inactive chromatin (A/B compartments), which are further organized into topologically associating domains (TADs). Zebrafish A/B compartments and TADs have genomic features similar to those of their mammalian counterparts, including evolutionary conservation and enrichment of CTCF binding sites at TAD borders. At the earliest time point, when there is no zygotic transcription, the genome is highly structured. After zygotic genome activation (ZGA), the genome loses structural features, which are re-established throughout early development. Despite the absence of structural features, we see clustering of super-enhancers in the 3D genome. Our results provide insight into vertebrate genome organization and demonstrate that the developing zebrafish embryo is a powerful model system to study the dynamics of nuclear organization. : How do developing zebrafish embryos organize their genome? Kaaij et al. show that, early in development, when there is no transcription, the genome is highly structured; however, when the zygotic genome is activated, this organization is lost. Later in development, the genome again adopts a structured organization.
    Keywords Biology (General) ; QH301-705.5
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: The ChAHP Complex Counteracts Chromatin Looping at CTCF Sites that Emerged from SINE Expansions in Mouse.

    Kaaij, Lucas J T / Mohn, Fabio / van der Weide, Robin H / de Wit, Elzo / Bühler, Marc

    Cell

    2019  Volume 178, Issue 6, Page(s) 1437–1451.e14

    Abstract: CCCTC-binding factor (CTCF) and cohesin are key players in three-dimensional chromatin organization. The topologically associating domains (TADs) demarcated by CTCF are remarkably well conserved between species, although genome-wide CTCF binding has ... ...

    Abstract CCCTC-binding factor (CTCF) and cohesin are key players in three-dimensional chromatin organization. The topologically associating domains (TADs) demarcated by CTCF are remarkably well conserved between species, although genome-wide CTCF binding has diverged substantially following transposon-mediated motif expansions. Therefore, the CTCF consensus motif poorly predicts TADs, and additional factors must modulate CTCF binding and subsequent TAD formation. Here, we demonstrate that the ChAHP complex (CHD4, ADNP, HP1) competes with CTCF for a common set of binding motifs. In Adnp knockout cells, novel insulated regions are formed at sites normally bound by ChAHP, whereas proximal canonical boundaries are weakened. These data reveal that CTCF-mediated loop formation is modulated by a distinct zinc-finger protein complex. Strikingly, ChAHP-bound loci are mainly situated within less diverged SINE B2 transposable elements. This implicates ChAHP in maintenance of evolutionarily conserved spatial chromatin organization by buffering novel CTCF binding sites that emerged through SINE expansions.
    MeSH term(s) Animals ; Binding Sites ; CCCTC-Binding Factor/metabolism ; Cell Line ; Chromatin/metabolism ; Chromosomal Proteins, Non-Histone/metabolism ; DNA Helicases/metabolism ; Embryonic Stem Cells/cytology ; Embryonic Stem Cells/metabolism ; Homeodomain Proteins/metabolism ; Mice ; Nerve Tissue Proteins/metabolism ; Protein Binding ; Protein Domains ; Retroelements
    Chemical Substances Adnp protein, mouse ; CCCTC-Binding Factor ; Chromatin ; Chromosomal Proteins, Non-Histone ; Ctcf protein, mouse ; Homeodomain Proteins ; Nerve Tissue Proteins ; Retroelements ; heterochromatin-specific nonhistone chromosomal protein HP-1 (107283-02-3) ; Mi-2beta protein, mouse (EC 3.6.1.3) ; DNA Helicases (EC 3.6.4.-)
    Language English
    Publishing date 2019-09-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 187009-9
    ISSN 1097-4172 ; 0092-8674
    ISSN (online) 1097-4172
    ISSN 0092-8674
    DOI 10.1016/j.cell.2019.08.007
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: piRNA dynamics in divergent zebrafish strains reveal long-lasting maternal influence on zygotic piRNA profiles.

    Kaaij, Lucas J T / Hoogstrate, Suzanne W / Berezikov, Eugene / Ketting, René F

    RNA (New York, N.Y.)

    2013  Volume 19, Issue 3, Page(s) 345–356

    Abstract: Transposable elements (TEs) are mobile genetic elements that can have many deleterious effects on the fitness of their host. The germline-specific PIWI pathway guards the genome against TEs, deriving its specificity from sequence complementarity between ... ...

    Abstract Transposable elements (TEs) are mobile genetic elements that can have many deleterious effects on the fitness of their host. The germline-specific PIWI pathway guards the genome against TEs, deriving its specificity from sequence complementarity between PIWI-bound small RNAs (piRNAs) and the TEs. The piRNAs are derived from so-called piRNA clusters. Recent studies have demonstrated that the piRNA repertoire can be adjusted to accommodate recent TE invasions by capturing invading TEs in piRNA loci. Thus far, no information concerning piRNA divergence is available from vertebrates. We present piRNA analyses of two relatively divergent zebrafish strains. We find that significant differences in the piRNA populations have accumulated, most notably among active class I TEs. This divergence can be split into differences in piRNA abundance per element and differences in sense/antisense polarity ratios. In crosses between animals of the different strains, many of these differences are resolved in the progeny. However, some differences remain, often leaning to the maternally contributed piRNA population. These differences can be detected at least two generations later. Our data illustrate, for the first time, the fluidity of piRNA populations in vertebrates and how the established diversity is transmitted to future generations.
    MeSH term(s) Animals ; Crosses, Genetic ; DNA Transposable Elements ; Epigenesis, Genetic ; Female ; Male ; RNA, Small Interfering/chemistry ; RNA, Small Interfering/metabolism ; Zebrafish/genetics ; Zebrafish/metabolism ; Zygote/metabolism
    Chemical Substances DNA Transposable Elements ; RNA, Small Interfering
    Language English
    Publishing date 2013-01-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1241540-6
    ISSN 1469-9001 ; 1355-8382
    ISSN (online) 1469-9001
    ISSN 1355-8382
    DOI 10.1261/rna.036400.112
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Dcr1 tracked down.

    Kaaij, Lucas J T / Ketting, René F

    Developmental cell

    2010  Volume 18, Issue 1, Page(s) 6–7

    Abstract: RNAi is essential for pericentromeric heterochromatic formation in S. pombe, and although Dcr1, the initiator protein of this process, has been biochemically well described, its subcellular localization has remained elusive. In this issue of ... ...

    Abstract RNAi is essential for pericentromeric heterochromatic formation in S. pombe, and although Dcr1, the initiator protein of this process, has been biochemically well described, its subcellular localization has remained elusive. In this issue of Developmental Cell, Emmerth et al. now show that Dcr1 is dynamically shuttling between nucleus and cytoplasm, adding new insight into the subcellular mechanics of RNAi.
    MeSH term(s) Active Transport, Cell Nucleus/genetics ; Animals ; Cell Nucleus/genetics ; Cell Nucleus/metabolism ; Cytoplasm/genetics ; Cytoplasm/metabolism ; Heterochromatin/genetics ; Humans ; Intracellular Signaling Peptides and Proteins/genetics ; Nuclear Pore/genetics ; Nuclear Pore/metabolism ; Protein Transport ; RNA Interference/physiology ; Ribonuclease III/genetics ; Ribonuclease III/metabolism ; Schizosaccharomyces/genetics ; Schizosaccharomyces/metabolism
    Chemical Substances Gid8 protein, S cerevisiae ; Heterochromatin ; Intracellular Signaling Peptides and Proteins ; Ribonuclease III (EC 3.1.26.3)
    Language English
    Publishing date 2010-01-19
    Publishing country United States
    Document type Comment ; Journal Article
    ZDB-ID 2054967-2
    ISSN 1878-1551 ; 1534-5807
    ISSN (online) 1878-1551
    ISSN 1534-5807
    DOI 10.1016/j.devcel.2010.01.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Tdrd6a Regulates the Aggregation of Buc into Functional Subcellular Compartments that Drive Germ Cell Specification.

    Roovers, Elke F / Kaaij, Lucas J T / Redl, Stefan / Bronkhorst, Alfred W / Wiebrands, Kay / de Jesus Domingues, António M / Huang, Hsin-Yi / Han, Chung-Ting / Riemer, Stephan / Dosch, Roland / Salvenmoser, Willi / Grün, Dominic / Butter, Falk / van Oudenaarden, Alexander / Ketting, René F

    Developmental cell

    2018  Volume 46, Issue 3, Page(s) 285–301.e9

    Abstract: Phase separation represents an important form of subcellular compartmentalization. However, relatively little is known about how the formation or disassembly of such compartments is regulated. In zebrafish, the Balbiani body (Bb) and the germ plasm (Gp) ... ...

    Abstract Phase separation represents an important form of subcellular compartmentalization. However, relatively little is known about how the formation or disassembly of such compartments is regulated. In zebrafish, the Balbiani body (Bb) and the germ plasm (Gp) are intimately linked phase-separated structures essential for germ cell specification and home to many germ cell-specific mRNAs and proteins. Throughout development, these structures occur as a single large aggregate (Bb), which disperses throughout oogenesis and upon fertilization accumulates again into relatively large assemblies (Gp). Formation of the Bb requires Bucky ball (Buc), a protein with prion-like properties. We found that the multi-tudor domain-containing protein Tdrd6a interacts with Buc, affecting its mobility and aggregation properties. Importantly, lack of this regulatory interaction leads to significant defects in germ cell development. Our work presents insights into how prion-like protein aggregations can be regulated and highlights the biological relevance of such regulatory events.
    MeSH term(s) Animals ; Cytoplasm/metabolism ; Germ Cells/metabolism ; Oocytes/metabolism ; Oogenesis/physiology ; Organelles/metabolism ; RNA, Messenger/metabolism ; Zebrafish ; Zebrafish Proteins/metabolism
    Chemical Substances RNA, Messenger ; Zebrafish Proteins ; buc protein, zebrafish
    Language English
    Publishing date 2018-08-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2054967-2
    ISSN 1878-1551 ; 1534-5807
    ISSN (online) 1878-1551
    ISSN 1534-5807
    DOI 10.1016/j.devcel.2018.07.009
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Enhancers reside in a unique epigenetic environment during early zebrafish development.

    Kaaij, Lucas J T / Mokry, Michal / Zhou, Meng / Musheev, Michael / Geeven, Geert / Melquiond, Adrien S J / de Jesus Domingues, António M / de Laat, Wouter / Niehrs, Christof / Smith, Andrew D / Ketting, René F

    Genome biology

    2016  Volume 17, Issue 1, Page(s) 146

    Abstract: Background: Enhancers, not promoters, are the most dynamic in their DNA methylation status throughout development and differentiation. Generally speaking, enhancers that are primed to or actually drive gene expression are characterized by relatively low ...

    Abstract Background: Enhancers, not promoters, are the most dynamic in their DNA methylation status throughout development and differentiation. Generally speaking, enhancers that are primed to or actually drive gene expression are characterized by relatively low levels of DNA methylation (hypo-methylation), while inactive enhancers display hyper-methylation of the underlying DNA. The direct functional significance of the DNA methylation state of enhancers is, however, unclear for most loci.
    Results: In contrast to conventional epigenetic interactions at enhancers, we find that DNA methylation status and enhancer activity during early zebrafish development display very unusual correlation characteristics: hypo-methylation is a unique feature of primed enhancers whereas active enhancers are generally hyper-methylated. The hypo-methylated enhancers that we identify (hypo-enhancers) are enriched close to important transcription factors that act later in development. Interestingly, hypo-enhancers are de-methylated shortly before the midblastula transition and reside in a unique epigenetic environment. Finally, we demonstrate that hypo-enhancers do become active at later developmental stages and that they are physically associated with the transcriptional start site of target genes, irrespective of target gene activity.
    Conclusions: We demonstrate that early development in zebrafish embodies a time window characterized by non-canonical DNA methylation-enhancer relationships, including global DNA hypo-methylation of inactive enhancers and DNA hyper-methylation of active enhancers.
    MeSH term(s) Animals ; Cell Differentiation/genetics ; DNA Methylation/genetics ; Embryonic Development/genetics ; Enhancer Elements, Genetic ; Epigenesis, Genetic ; Gene Expression Regulation, Developmental ; Transcription Initiation Site ; Zebrafish/genetics ; Zebrafish/growth & development
    Language English
    Publishing date 2016-07-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 2040529-7
    ISSN 1474-760X ; 1465-6914 ; 1465-6906
    ISSN (online) 1474-760X ; 1465-6914
    ISSN 1465-6906
    DOI 10.1186/s13059-016-1013-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Enhancers reside in a unique epigenetic environment during early zebrafish development

    Kaaij, Lucas J. T / Mokry, Michal / Zhou, Meng / Musheev, Michael / Geeven, Geert / Melquiond, Adrien S. J / de Jesus Domingues, António M / de Laat, Wouter / Niehrs, Christof / Smith, Andrew D / Ketting, René F

    Genome biology. 2016 Dec., v. 17, no. 1

    2016  

    Abstract: BACKGROUND: Enhancers, not promoters, are the most dynamic in their DNA methylation status throughout development and differentiation. Generally speaking, enhancers that are primed to or actually drive gene expression are characterized by relatively low ... ...

    Abstract BACKGROUND: Enhancers, not promoters, are the most dynamic in their DNA methylation status throughout development and differentiation. Generally speaking, enhancers that are primed to or actually drive gene expression are characterized by relatively low levels of DNA methylation (hypo-methylation), while inactive enhancers display hyper-methylation of the underlying DNA. The direct functional significance of the DNA methylation state of enhancers is, however, unclear for most loci. RESULTS: In contrast to conventional epigenetic interactions at enhancers, we find that DNA methylation status and enhancer activity during early zebrafish development display very unusual correlation characteristics: hypo-methylation is a unique feature of primed enhancers whereas active enhancers are generally hyper-methylated. The hypo-methylated enhancers that we identify (hypo-enhancers) are enriched close to important transcription factors that act later in development. Interestingly, hypo-enhancers are de-methylated shortly before the midblastula transition and reside in a unique epigenetic environment. Finally, we demonstrate that hypo-enhancers do become active at later developmental stages and that they are physically associated with the transcriptional start site of target genes, irrespective of target gene activity. CONCLUSIONS: We demonstrate that early development in zebrafish embodies a time window characterized by non-canonical DNA methylation–enhancer relationships, including global DNA hypo-methylation of inactive enhancers and DNA hyper-methylation of active enhancers.
    Keywords DNA ; DNA methylation ; Danio rerio ; developmental stages ; early development ; epigenetics ; gene expression ; loci ; transcription (genetics) ; transcription factors
    Language English
    Dates of publication 2016-12
    Size p. 146.
    Publishing place BioMed Central
    Document type Article
    ZDB-ID 2040529-7
    ISSN 1474-760X ; 1465-6906
    ISSN (online) 1474-760X
    ISSN 1465-6906
    DOI 10.1186/s13059-016-1013-1
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: Extremely stable Piwi-induced gene silencing in Caenorhabditis elegans.

    Luteijn, Maartje J / van Bergeijk, Petra / Kaaij, Lucas J T / Almeida, Miguel Vasconcelos / Roovers, Elke F / Berezikov, Eugene / Ketting, René F

    The EMBO journal

    2012  Volume 31, Issue 16, Page(s) 3422–3430

    Abstract: In recent years, the Piwi pathway has been shown to regulate the silencing of mobile genetic elements. However, we know little about how Piwi pathways impose silencing and even less about trans-generational stability of Piwi-induced silencing. We ... ...

    Abstract In recent years, the Piwi pathway has been shown to regulate the silencing of mobile genetic elements. However, we know little about how Piwi pathways impose silencing and even less about trans-generational stability of Piwi-induced silencing. We demonstrate that the Caenorhabditis elegans Piwi protein PRG-1 can initiate an extremely stable form of gene silencing on a transgenic, single-copy target. This type of silencing is faithfully maintained over tens of generations in the absence of a functional Piwi pathway. Interestingly, RNAi can also trigger permanent gene silencing of a single-copy transgene and the phenomenon will be collectively referred to as RNA-induced epigenetic silencing (RNAe). RNAe can act in trans and is dependent on endogenous RNAi factors. The involvement of factors known to act in nuclear RNAi and the fact that RNAe is accompanied by repressive chromatin marks indicate that RNAe includes a transcriptional silencing component. Our results demonstrate that, at least in C. elegans, the Piwi pathway can impose a state of gene silencing that borders on 'permanently silent'. Such a property may be more widely conserved among Piwi pathways in different animals.
    MeSH term(s) Animals ; Animals, Genetically Modified ; Argonaute Proteins/metabolism ; Caenorhabditis elegans/enzymology ; Caenorhabditis elegans/physiology ; Caenorhabditis elegans Proteins/metabolism ; Gene Expression Profiling ; Gene Silencing ; Models, Biological
    Chemical Substances Argonaute Proteins ; Caenorhabditis elegans Proteins ; PRG-1 protein, C elegans
    Language English
    Publishing date 2012-07-31
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 586044-1
    ISSN 1460-2075 ; 0261-4189
    ISSN (online) 1460-2075
    ISSN 0261-4189
    DOI 10.1038/emboj.2012.213
    Database MEDical Literature Analysis and Retrieval System OnLINE

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