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<div id="p0010" role="paragraph">HIRA establishes greater telomeric chromatin accessibility after ATRX-DAXX loss</div>
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<div id="abspara0010" role="paragraph">HNF1β (<i>HNF1B</i>) is a transcription factor frequently mutated in patients with developmental renal disease. It binds to mitotic chromatin and reactivates gene expression after mitosis, a phenomenon referred to as bookmarking. Using a crosslinking method that circumvents the artifacts of formaldehyde, we demonstrate that HNF1β remains associated with chromatin in a sequence-specific way in both interphase and mitosis. We identify an HNF1β-interacting protein, BTBD2, that enables the interaction and activation of Topoisomerase 1 (TOP1) exclusively during mitosis. Our study identifies a shared microhomology domain between HNF1β and TOP1, where a mutation, found in “maturity onset diabetes of the young” patients, disrupts their interaction. Importantly, HNF1β recruits TOP1 and induces DNA relaxation around HNF1β mitotic chromatin sites, elucidating its crucial role in chromatin remodeling and gene reactivation after mitotic exit. These findings shed light on how HNF1β reactivates target gene expression after mitosis, providing insights into its crucial role in maintenance of cellular identity.</div>
</section>',
'date' => '2024-10-08',
'pmid' => 'https://www.cell.com/cell-reports/fulltext/S2211-1247(24)01156-2',
'doi' => '10.1016/j.celrep.2024.114805',
'modified' => '2024-10-14 09:04:44',
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'name' => 'High-throughput sequencing of insect specimens with sub-optimal DNA preservation using a practical, plate-based Illumina-compatible Tn5 transposase library preparation method',
'authors' => 'Cobb L. et all.',
'description' => '<p><span>Entomological sampling and storage conditions often prioritise efficiency, practicality and conservation of morphological characteristics, and may therefore be suboptimal for DNA preservation. This practice can impact downstream molecular applications, such as the generation of high-throughput genomic libraries, which often requires substantial DNA input amounts. Here, we use a practical Tn5 transposase tagmentation-based library preparation method optimised for 96-well plates and low yield DNA extracts from insect legs that were stored under sub-optimal conditions for DNA preservation. The samples were kept in field vehicles for extended periods of time, before long-term storage in ethanol in the freezer, or dry at room temperature. By reducing DNA input to 6ng, more samples with sub-optimal DNA yields could be processed. We matched this low DNA input with a 6-fold dilution of a commercially available tagmentation enzyme, significantly reducing library preparation costs. Costs and workload were further suppressed by direct post-amplification pooling of individual libraries. We generated medium coverage (>3-fold) genomes for 88 out of 90 specimens, with an average of approximately 10-fold coverage. While samples stored in ethanol yielded significantly less DNA compared to those which were stored dry, these samples had superior sequencing statistics, with longer sequencing reads and higher rates of endogenous DNA. Furthermore, we find that the efficiency of tagmentation-based library preparation can be improved by a thorough post-amplification bead clean-up which selects against both short and large DNA fragments. By opening opportunities for the use of sub-optimally preserved, low yield DNA extracts, we broaden the scope of whole genome studies of insect specimens. We therefore expect these results and this protocol to be valuable for a range of applications in the field of entomology.</span></p>',
'date' => '2024-03-22',
'pmid' => 'https://pubmed.ncbi.nlm.nih.gov/38517905/',
'doi' => '10.1371/journal.pone.0300865',
'modified' => '2024-03-25 11:15:06',
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'name' => 'On the identification of differentially-active transcription factors from ATAC-seq data',
'authors' => 'Gerbaldo F. et al.',
'description' => '<p><span>ATAC-seq has emerged as a rich epigenome profiling technique, and is commonly used to identify Transcription Factors (TFs) underlying given phenomena. A number of methods can be used to identify differentially-active TFs through the accessibility of their DNA-binding motif, however little is known on the best approaches for doing so. Here we benchmark several such methods using a combination of curated datasets with various forms of short-term perturbations on known TFs, as well as semi-simulations. We include both methods specifically designed for this type of data as well as some that can be repurposed for it. We also investigate variations to these methods, and identify three particularly promising approaches (chromVAR-limma with critical adjustments, monaLisa and a combination of GC smooth quantile normalization and multivariate modeling). We further investigate the specific use of nucleosome-free fragments, the combination of top methods, and the impact of technical variation. Finally, we illustrate the use of the top methods on a novel dataset to characterize the impact on DNA accessibility of TRAnscription Factor TArgeting Chimeras (TRAFTAC), which can deplete TFs – in our case NFkB – at the protein level.</span></p>',
'date' => '2024-03-10',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2024.03.06.583825v2',
'doi' => 'https://doi.org/10.1101/2024.03.06.583825',
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'name' => 'Improved metagenome assemblies through selective enrichment of bacterial genomic DNA from eukaryotic host genomic DNA using ATAC-seq',
'authors' => 'Lindsey J Cantin et al.',
'description' => '<p><span>Genomics can be used to study the complex relationships between hosts and their microbiota. Many bacteria cannot be cultured in the laboratory, making it difficult to obtain adequate amounts of bacterial DNA and to limit host DNA contamination for the construction of metagenome-assembled genomes (MAGs). For example, </span><em>Wolbachia</em><span><span> </span>is a genus of exclusively obligate intracellular bacteria that live in a wide range of arthropods and some nematodes. While<span> </span></span><em>Wolbachia</em><span><span> </span>endosymbionts are frequently described as facultative reproductive parasites in arthropods, the bacteria are obligate mutualistic endosymbionts of filarial worms. Here, we achieve 50-fold enrichment of bacterial sequences using ATAC-seq (Assay for Transposase-Accessible Chromatin using sequencing) with<span> </span></span><em>Brugia malayi</em><span><span> </span>nematodes, containing<span> </span></span><em>Wolbachia</em><span><span> </span>(</span><em>w</em><span>Bm). ATAC-seq uses the Tn5 transposase to cut and attach Illumina sequencing adapters to accessible DNA lacking histones, typically thought to be open chromatin. Bacterial and mitochondrial DNA in the lysates are also cut preferentially since they lack histones, leading to the enrichment of these sequences. The benefits of this include minimal tissue input (<1 mg of tissue), a quick protocol (<4 h), low sequencing costs, less bias, correct assembly of lateral gene transfers and no prior sequence knowledge required. We assembled the<span> </span></span><em>w</em><span>Bm genome with as few as 1 million Illumina short paired-end reads with >97% coverage of the published genome, compared to only 12% coverage with the standard gDNA libraries. We found significant bacterial sequence enrichment that facilitated genome assembly in previously published ATAC-seq data sets from human cells infected with<span> </span></span><em>Mycobacterium tuberculosis</em><span><span> </span>and<span> </span></span><em>C. elegans</em><span><span> </span>contaminated with their food source, the OP50 strain of<span> </span></span><em>E. coli</em><span>. These results demonstrate the feasibility and benefits of using ATAC-seq to easily obtain bacterial genomes to aid in symbiosis, infectious disease, and microbiome research.</span></p>',
'date' => '2024-02-15',
'pmid' => 'https://pmc.ncbi.nlm.nih.gov/articles/PMC10902005/',
'doi' => '10.3389/fmicb.2024.1352378',
'modified' => '2024-11-29 11:10:24',
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'name' => 'ARID1A governs the silencing of sex-linked transcription during male meiosis in the mouse',
'authors' => 'Menon D.U. et al.',
'description' => '<p><span>We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes, indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that did not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences meiotic sex chromosome gene regulation and DNA repair.</span></p>',
'date' => '2023-09-28',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2023.05.25.542290v2.abstract',
'doi' => 'https://doi.org/10.1101/2023.05.25.542290',
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'description' => '<p><span>Tumor-initiating cells are major drivers of chemoresistance and attractive targets for cancer therapy, however, their identity in human pancreatic ductal adenocarcinoma (PDAC) and the key molecules underlying their traits remain poorly understood. Here, we show that a cellular subpopulation with partial epithelial-mesenchymal transition (EMT)-like signature marked by high expression of receptor tyrosine kinase-like orphan receptor 1 (ROR1) is the origin of heterogeneous tumor cells in PDAC. We demonstrate that ROR1 depletion suppresses tumor growth, recurrence after chemotherapy, and metastasis. Mechanistically, ROR1 induces the expression of Aurora kinase B (AURKB) by activating E2F through c-Myc to enhance PDAC proliferation. Furthermore, epigenomic analyses reveal that ROR1 is transcriptionally dependent on YAP/BRD4 binding at the enhancer region, and targeting this pathway reduces ROR1 expression and prevents PDAC growth. Collectively, our findings reveal a critical role for ROR1high cells as tumor-initiating cells and the functional importance of ROR1 in PDAC progression, thereby highlighting its therapeutic targetability.</span></p>',
'date' => '2023-04-01',
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'doi' => '10.15252/embj.2022112614',
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'authors' => 'Zou Han et al.',
'description' => '<p>How abnormal neurodevelopment relates to the tumour aggressiveness of medulloblastoma (MB), the most common type of embryonal tumour, remains elusive. Here we uncover a neurodevelopmental epigenomic programme that is hijacked to induce MB metastatic dissemination. Unsupervised analyses of integrated publicly available datasets with our newly generated data reveal that SMARCD3 (also known as BAF60C) regulates Disabled 1 (DAB1)-mediated Reelin signalling in Purkinje cell migration and MB metastasis by orchestrating cis-regulatory elements at the DAB1 locus. We further identify that a core set of transcription factors, enhancer of zeste homologue 2 (EZH2) and nuclear factor I X (NFIX), coordinates with the cis-regulatory elements at the SMARCD3 locus to form a chromatin hub to control SMARCD3 expression in the developing cerebellum and in metastatic MB. Increased SMARCD3 expression activates Reelin-DAB1-mediated Src kinase signalling, which results in a MB response to Src inhibition. These data deepen our understanding of how neurodevelopmental programming influences disease progression and provide a potential therapeutic option for patients with MB.</p>',
'date' => '2023-02-01',
'pmid' => 'https://www.ncbi.nlm.nih.gov/pubmed/36849558',
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'description' => '<p>The establishment of de novo chromatin accessibility in lymphoid progenitors requires the "pioneering" function of transcription factor (TF) early B cell factor 1 (EBF1), which binds to naïve chromatin and induces accessibility by recruiting the BRG1 chromatin remodeler subunit. However, it remains unclear whether the function of EBF1 is continuously required for stabilizing local chromatin accessibility. To this end, we replaced EBF1 by EBF1-FKBP in pro-B cells, allowing the rapid degradation by adding the degradation TAG13 (dTAG13) dimerizer. EBF1 degradation results in a loss of genome-wide EBF1 occupancy and EBF1-targeted BRG1 binding. Chromatin accessibility was rapidly diminished at EBF1-binding sites with a preference for sites whose occupancy requires the pioneering activity of the C-terminal domain of EBF1. Diminished chromatin accessibility correlated with altered gene expression. Thus, continuous activity of EBF1 is required for the stable maintenance of the transcriptional and epigenetic state of pro-B cells.</p>',
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<p>Diagenode <strong>Tagmentation Buffer (2x)</strong> is the recommended reagent to perform any tagmentation reactions. It can be used in combination with Diagenode <a href="https://www.diagenode.com/en/p/tagmentase-loaded-30">Tagmentase (Tn5 transposase)</a> on DNA or chromatin samples, as half of the total volume reaction like in ATAC-seq protocol.</p>
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<li>After cell lysis and nuclei isolation, the nuclei pellets can be incubated with the following mix for 1 reaction:</li>
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<table style="width: 447px;">
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<td style="width: 326px;">Tagmentation Buffer (2x)</td>
<td style="width: 114px; padding-left: 30px;">25 µl</td>
</tr>
<tr>
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View::_render() - CORE/Cake/View/View.php, line 933
View::render() - CORE/Cake/View/View.php, line 473
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<div id="p0015" role="paragraph">Deposition of new H3.3 by HIRA-UBN restricts telomeric ssDNA and TERRA R-loops</div>
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<div id="abspara0010" role="paragraph">Inactivating mutations in chromatin modifiers, like the α-thalassemia/mental retardation, X-linked (ATRX)-death domain-associated protein (DAXX) chromatin remodeling/histone H3.3 deposition complex, drive the cancer-specific alternative lengthening of telomeres (ALT) pathway. Prior studies revealed that HIRA, another histone H3.3 chaperone, compensates for ATRX-DAXX loss at telomeres to sustain ALT cancer cell survival. How HIRA rescues telomeres from the consequences of ATRX-DAXX deficiency remains unclear. Here, using an assay for transposase-accessible chromatin using sequencing (ATAC-seq) and cleavage under targets and release using nuclease (CUT&RUN), we establish that HIRA-mediated deposition of new H3.3 maintains telomeric chromatin accessibility to prevent the detrimental accumulation of nucleosome-free single-stranded DNA (ssDNA) in ATRX-DAXX-deficient ALT cells. We show that the HIRA-UBN1/UBN2 complex deposits new H3.3 to prevent TERRA R-loop buildup and transcription-replication conflicts (TRCs) at telomeres. Furthermore, HIRA-mediated H3.3 incorporation into telomeric chromatin links productive ALT to the phosphorylation of serine 31, an H3.3-specific amino acid, by Chk1. Therefore, we identify a critical role for HIRA-mediated H3.3 deposition that ensures the survival of ATRX-DAXX-deficient ALT cancer cells.</div>
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'name' => 'On the identification of differentially-active transcription factors from ATAC-seq data',
'authors' => 'Gerbaldo F. et al.',
'description' => '<p><span>ATAC-seq has emerged as a rich epigenome profiling technique, and is commonly used to identify Transcription Factors (TFs) underlying given phenomena. A number of methods can be used to identify differentially-active TFs through the accessibility of their DNA-binding motif, however little is known on the best approaches for doing so. Here we benchmark several such methods using a combination of curated datasets with various forms of short-term perturbations on known TFs, as well as semi-simulations. We include both methods specifically designed for this type of data as well as some that can be repurposed for it. We also investigate variations to these methods, and identify three particularly promising approaches (chromVAR-limma with critical adjustments, monaLisa and a combination of GC smooth quantile normalization and multivariate modeling). We further investigate the specific use of nucleosome-free fragments, the combination of top methods, and the impact of technical variation. Finally, we illustrate the use of the top methods on a novel dataset to characterize the impact on DNA accessibility of TRAnscription Factor TArgeting Chimeras (TRAFTAC), which can deplete TFs – in our case NFkB – at the protein level.</span></p>',
'date' => '2024-03-10',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2024.03.06.583825v2',
'doi' => 'https://doi.org/10.1101/2024.03.06.583825',
'modified' => '2024-03-13 17:04:33',
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'name' => 'Improved metagenome assemblies through selective enrichment of bacterial genomic DNA from eukaryotic host genomic DNA using ATAC-seq',
'authors' => 'Lindsey J Cantin et al.',
'description' => '<p><span>Genomics can be used to study the complex relationships between hosts and their microbiota. Many bacteria cannot be cultured in the laboratory, making it difficult to obtain adequate amounts of bacterial DNA and to limit host DNA contamination for the construction of metagenome-assembled genomes (MAGs). For example, </span><em>Wolbachia</em><span><span> </span>is a genus of exclusively obligate intracellular bacteria that live in a wide range of arthropods and some nematodes. While<span> </span></span><em>Wolbachia</em><span><span> </span>endosymbionts are frequently described as facultative reproductive parasites in arthropods, the bacteria are obligate mutualistic endosymbionts of filarial worms. Here, we achieve 50-fold enrichment of bacterial sequences using ATAC-seq (Assay for Transposase-Accessible Chromatin using sequencing) with<span> </span></span><em>Brugia malayi</em><span><span> </span>nematodes, containing<span> </span></span><em>Wolbachia</em><span><span> </span>(</span><em>w</em><span>Bm). ATAC-seq uses the Tn5 transposase to cut and attach Illumina sequencing adapters to accessible DNA lacking histones, typically thought to be open chromatin. Bacterial and mitochondrial DNA in the lysates are also cut preferentially since they lack histones, leading to the enrichment of these sequences. The benefits of this include minimal tissue input (<1 mg of tissue), a quick protocol (<4 h), low sequencing costs, less bias, correct assembly of lateral gene transfers and no prior sequence knowledge required. We assembled the<span> </span></span><em>w</em><span>Bm genome with as few as 1 million Illumina short paired-end reads with >97% coverage of the published genome, compared to only 12% coverage with the standard gDNA libraries. We found significant bacterial sequence enrichment that facilitated genome assembly in previously published ATAC-seq data sets from human cells infected with<span> </span></span><em>Mycobacterium tuberculosis</em><span><span> </span>and<span> </span></span><em>C. elegans</em><span><span> </span>contaminated with their food source, the OP50 strain of<span> </span></span><em>E. coli</em><span>. These results demonstrate the feasibility and benefits of using ATAC-seq to easily obtain bacterial genomes to aid in symbiosis, infectious disease, and microbiome research.</span></p>',
'date' => '2024-02-15',
'pmid' => 'https://pmc.ncbi.nlm.nih.gov/articles/PMC10902005/',
'doi' => '10.3389/fmicb.2024.1352378',
'modified' => '2024-11-29 11:10:24',
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'id' => '4878',
'name' => 'ARID1A governs the silencing of sex-linked transcription during male meiosis in the mouse',
'authors' => 'Menon D.U. et al.',
'description' => '<p><span>We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes, indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that did not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences meiotic sex chromosome gene regulation and DNA repair.</span></p>',
'date' => '2023-09-28',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2023.05.25.542290v2.abstract',
'doi' => 'https://doi.org/10.1101/2023.05.25.542290',
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'description' => '<p><span>Tumor-initiating cells are major drivers of chemoresistance and attractive targets for cancer therapy, however, their identity in human pancreatic ductal adenocarcinoma (PDAC) and the key molecules underlying their traits remain poorly understood. Here, we show that a cellular subpopulation with partial epithelial-mesenchymal transition (EMT)-like signature marked by high expression of receptor tyrosine kinase-like orphan receptor 1 (ROR1) is the origin of heterogeneous tumor cells in PDAC. We demonstrate that ROR1 depletion suppresses tumor growth, recurrence after chemotherapy, and metastasis. Mechanistically, ROR1 induces the expression of Aurora kinase B (AURKB) by activating E2F through c-Myc to enhance PDAC proliferation. Furthermore, epigenomic analyses reveal that ROR1 is transcriptionally dependent on YAP/BRD4 binding at the enhancer region, and targeting this pathway reduces ROR1 expression and prevents PDAC growth. Collectively, our findings reveal a critical role for ROR1high cells as tumor-initiating cells and the functional importance of ROR1 in PDAC progression, thereby highlighting its therapeutic targetability.</span></p>',
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'name' => 'A neurodevelopmental epigenetic programme mediated bySMARCD3-DAB1-Reelin signalling is hijacked to promote medulloblastomametastasis.',
'authors' => 'Zou Han et al.',
'description' => '<p>How abnormal neurodevelopment relates to the tumour aggressiveness of medulloblastoma (MB), the most common type of embryonal tumour, remains elusive. Here we uncover a neurodevelopmental epigenomic programme that is hijacked to induce MB metastatic dissemination. Unsupervised analyses of integrated publicly available datasets with our newly generated data reveal that SMARCD3 (also known as BAF60C) regulates Disabled 1 (DAB1)-mediated Reelin signalling in Purkinje cell migration and MB metastasis by orchestrating cis-regulatory elements at the DAB1 locus. We further identify that a core set of transcription factors, enhancer of zeste homologue 2 (EZH2) and nuclear factor I X (NFIX), coordinates with the cis-regulatory elements at the SMARCD3 locus to form a chromatin hub to control SMARCD3 expression in the developing cerebellum and in metastatic MB. Increased SMARCD3 expression activates Reelin-DAB1-mediated Src kinase signalling, which results in a MB response to Src inhibition. These data deepen our understanding of how neurodevelopmental programming influences disease progression and provide a potential therapeutic option for patients with MB.</p>',
'date' => '2023-02-01',
'pmid' => 'https://www.ncbi.nlm.nih.gov/pubmed/36849558',
'doi' => '10.1038/s41556-023-01093-0',
'modified' => '2023-03-14 09:41:24',
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'authors' => 'Zolotarev Nikolay et al.',
'description' => '<p>The establishment of de novo chromatin accessibility in lymphoid progenitors requires the "pioneering" function of transcription factor (TF) early B cell factor 1 (EBF1), which binds to naïve chromatin and induces accessibility by recruiting the BRG1 chromatin remodeler subunit. However, it remains unclear whether the function of EBF1 is continuously required for stabilizing local chromatin accessibility. To this end, we replaced EBF1 by EBF1-FKBP in pro-B cells, allowing the rapid degradation by adding the degradation TAG13 (dTAG13) dimerizer. EBF1 degradation results in a loss of genome-wide EBF1 occupancy and EBF1-targeted BRG1 binding. Chromatin accessibility was rapidly diminished at EBF1-binding sites with a preference for sites whose occupancy requires the pioneering activity of the C-terminal domain of EBF1. Diminished chromatin accessibility correlated with altered gene expression. Thus, continuous activity of EBF1 is required for the stable maintenance of the transcriptional and epigenetic state of pro-B cells.</p>',
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<p>Diagenode <strong>Tagmentation Buffer (2x)</strong> is the recommended reagent to perform any tagmentation reactions. It can be used in combination with Diagenode <a href="https://www.diagenode.com/en/p/tagmentase-loaded-30">Tagmentase (Tn5 transposase)</a> on DNA or chromatin samples, as half of the total volume reaction like in ATAC-seq protocol.</p>
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<td style="width: 326px;">Tagmentation Buffer (2x)</td>
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<div id="p0010" role="paragraph">HIRA establishes greater telomeric chromatin accessibility after ATRX-DAXX loss</div>
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<div class="content">
<div id="p0015" role="paragraph">Deposition of new H3.3 by HIRA-UBN restricts telomeric ssDNA and TERRA R-loops</div>
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<div id="p0020" role="paragraph">Unresolved TERRA R-loops block new H3.3 deposition by HIRA-UBN</div>
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<div id="p0025" role="paragraph">CHK1 phosphorylation of H3.3 is critical to prevent ssDNA and TERRA R-loop buildup</div>
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<div id="abspara0010" role="paragraph">Inactivating mutations in chromatin modifiers, like the α-thalassemia/mental retardation, X-linked (ATRX)-death domain-associated protein (DAXX) chromatin remodeling/histone H3.3 deposition complex, drive the cancer-specific alternative lengthening of telomeres (ALT) pathway. Prior studies revealed that HIRA, another histone H3.3 chaperone, compensates for ATRX-DAXX loss at telomeres to sustain ALT cancer cell survival. How HIRA rescues telomeres from the consequences of ATRX-DAXX deficiency remains unclear. Here, using an assay for transposase-accessible chromatin using sequencing (ATAC-seq) and cleavage under targets and release using nuclease (CUT&RUN), we establish that HIRA-mediated deposition of new H3.3 maintains telomeric chromatin accessibility to prevent the detrimental accumulation of nucleosome-free single-stranded DNA (ssDNA) in ATRX-DAXX-deficient ALT cells. We show that the HIRA-UBN1/UBN2 complex deposits new H3.3 to prevent TERRA R-loop buildup and transcription-replication conflicts (TRCs) at telomeres. Furthermore, HIRA-mediated H3.3 incorporation into telomeric chromatin links productive ALT to the phosphorylation of serine 31, an H3.3-specific amino acid, by Chk1. Therefore, we identify a critical role for HIRA-mediated H3.3 deposition that ensures the survival of ATRX-DAXX-deficient ALT cancer cells.</div>
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<div id="p0015" role="paragraph">BTBD2, an HNF1β partner, mediates mitosis-specific interaction with TOP1</div>
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<div id="p0025" role="paragraph">An HNF1β mutation, found in MODY patients, disrupts the interaction with TOP1</div>
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<div id="abspara0010" role="paragraph">HNF1β (<i>HNF1B</i>) is a transcription factor frequently mutated in patients with developmental renal disease. It binds to mitotic chromatin and reactivates gene expression after mitosis, a phenomenon referred to as bookmarking. Using a crosslinking method that circumvents the artifacts of formaldehyde, we demonstrate that HNF1β remains associated with chromatin in a sequence-specific way in both interphase and mitosis. We identify an HNF1β-interacting protein, BTBD2, that enables the interaction and activation of Topoisomerase 1 (TOP1) exclusively during mitosis. Our study identifies a shared microhomology domain between HNF1β and TOP1, where a mutation, found in “maturity onset diabetes of the young” patients, disrupts their interaction. Importantly, HNF1β recruits TOP1 and induces DNA relaxation around HNF1β mitotic chromatin sites, elucidating its crucial role in chromatin remodeling and gene reactivation after mitotic exit. These findings shed light on how HNF1β reactivates target gene expression after mitosis, providing insights into its crucial role in maintenance of cellular identity.</div>
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'description' => '<p><span>Entomological sampling and storage conditions often prioritise efficiency, practicality and conservation of morphological characteristics, and may therefore be suboptimal for DNA preservation. This practice can impact downstream molecular applications, such as the generation of high-throughput genomic libraries, which often requires substantial DNA input amounts. Here, we use a practical Tn5 transposase tagmentation-based library preparation method optimised for 96-well plates and low yield DNA extracts from insect legs that were stored under sub-optimal conditions for DNA preservation. The samples were kept in field vehicles for extended periods of time, before long-term storage in ethanol in the freezer, or dry at room temperature. By reducing DNA input to 6ng, more samples with sub-optimal DNA yields could be processed. We matched this low DNA input with a 6-fold dilution of a commercially available tagmentation enzyme, significantly reducing library preparation costs. Costs and workload were further suppressed by direct post-amplification pooling of individual libraries. We generated medium coverage (>3-fold) genomes for 88 out of 90 specimens, with an average of approximately 10-fold coverage. While samples stored in ethanol yielded significantly less DNA compared to those which were stored dry, these samples had superior sequencing statistics, with longer sequencing reads and higher rates of endogenous DNA. Furthermore, we find that the efficiency of tagmentation-based library preparation can be improved by a thorough post-amplification bead clean-up which selects against both short and large DNA fragments. By opening opportunities for the use of sub-optimally preserved, low yield DNA extracts, we broaden the scope of whole genome studies of insect specimens. We therefore expect these results and this protocol to be valuable for a range of applications in the field of entomology.</span></p>',
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'authors' => 'Lindsey J Cantin et al.',
'description' => '<p><span>Genomics can be used to study the complex relationships between hosts and their microbiota. Many bacteria cannot be cultured in the laboratory, making it difficult to obtain adequate amounts of bacterial DNA and to limit host DNA contamination for the construction of metagenome-assembled genomes (MAGs). For example, </span><em>Wolbachia</em><span><span> </span>is a genus of exclusively obligate intracellular bacteria that live in a wide range of arthropods and some nematodes. While<span> </span></span><em>Wolbachia</em><span><span> </span>endosymbionts are frequently described as facultative reproductive parasites in arthropods, the bacteria are obligate mutualistic endosymbionts of filarial worms. Here, we achieve 50-fold enrichment of bacterial sequences using ATAC-seq (Assay for Transposase-Accessible Chromatin using sequencing) with<span> </span></span><em>Brugia malayi</em><span><span> </span>nematodes, containing<span> </span></span><em>Wolbachia</em><span><span> </span>(</span><em>w</em><span>Bm). ATAC-seq uses the Tn5 transposase to cut and attach Illumina sequencing adapters to accessible DNA lacking histones, typically thought to be open chromatin. Bacterial and mitochondrial DNA in the lysates are also cut preferentially since they lack histones, leading to the enrichment of these sequences. The benefits of this include minimal tissue input (<1 mg of tissue), a quick protocol (<4 h), low sequencing costs, less bias, correct assembly of lateral gene transfers and no prior sequence knowledge required. We assembled the<span> </span></span><em>w</em><span>Bm genome with as few as 1 million Illumina short paired-end reads with >97% coverage of the published genome, compared to only 12% coverage with the standard gDNA libraries. We found significant bacterial sequence enrichment that facilitated genome assembly in previously published ATAC-seq data sets from human cells infected with<span> </span></span><em>Mycobacterium tuberculosis</em><span><span> </span>and<span> </span></span><em>C. elegans</em><span><span> </span>contaminated with their food source, the OP50 strain of<span> </span></span><em>E. coli</em><span>. These results demonstrate the feasibility and benefits of using ATAC-seq to easily obtain bacterial genomes to aid in symbiosis, infectious disease, and microbiome research.</span></p>',
'date' => '2024-02-15',
'pmid' => 'https://pmc.ncbi.nlm.nih.gov/articles/PMC10902005/',
'doi' => '10.3389/fmicb.2024.1352378',
'modified' => '2024-11-29 11:10:24',
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'name' => 'ARID1A governs the silencing of sex-linked transcription during male meiosis in the mouse',
'authors' => 'Menon D.U. et al.',
'description' => '<p><span>We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes, indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that did not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences meiotic sex chromosome gene regulation and DNA repair.</span></p>',
'date' => '2023-09-28',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2023.05.25.542290v2.abstract',
'doi' => 'https://doi.org/10.1101/2023.05.25.542290',
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'description' => '<p><span>Tumor-initiating cells are major drivers of chemoresistance and attractive targets for cancer therapy, however, their identity in human pancreatic ductal adenocarcinoma (PDAC) and the key molecules underlying their traits remain poorly understood. Here, we show that a cellular subpopulation with partial epithelial-mesenchymal transition (EMT)-like signature marked by high expression of receptor tyrosine kinase-like orphan receptor 1 (ROR1) is the origin of heterogeneous tumor cells in PDAC. We demonstrate that ROR1 depletion suppresses tumor growth, recurrence after chemotherapy, and metastasis. Mechanistically, ROR1 induces the expression of Aurora kinase B (AURKB) by activating E2F through c-Myc to enhance PDAC proliferation. Furthermore, epigenomic analyses reveal that ROR1 is transcriptionally dependent on YAP/BRD4 binding at the enhancer region, and targeting this pathway reduces ROR1 expression and prevents PDAC growth. Collectively, our findings reveal a critical role for ROR1high cells as tumor-initiating cells and the functional importance of ROR1 in PDAC progression, thereby highlighting its therapeutic targetability.</span></p>',
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'authors' => 'Zou Han et al.',
'description' => '<p>How abnormal neurodevelopment relates to the tumour aggressiveness of medulloblastoma (MB), the most common type of embryonal tumour, remains elusive. Here we uncover a neurodevelopmental epigenomic programme that is hijacked to induce MB metastatic dissemination. Unsupervised analyses of integrated publicly available datasets with our newly generated data reveal that SMARCD3 (also known as BAF60C) regulates Disabled 1 (DAB1)-mediated Reelin signalling in Purkinje cell migration and MB metastasis by orchestrating cis-regulatory elements at the DAB1 locus. We further identify that a core set of transcription factors, enhancer of zeste homologue 2 (EZH2) and nuclear factor I X (NFIX), coordinates with the cis-regulatory elements at the SMARCD3 locus to form a chromatin hub to control SMARCD3 expression in the developing cerebellum and in metastatic MB. Increased SMARCD3 expression activates Reelin-DAB1-mediated Src kinase signalling, which results in a MB response to Src inhibition. These data deepen our understanding of how neurodevelopmental programming influences disease progression and provide a potential therapeutic option for patients with MB.</p>',
'date' => '2023-02-01',
'pmid' => 'https://www.ncbi.nlm.nih.gov/pubmed/36849558',
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'description' => '<p>The establishment of de novo chromatin accessibility in lymphoid progenitors requires the "pioneering" function of transcription factor (TF) early B cell factor 1 (EBF1), which binds to naïve chromatin and induces accessibility by recruiting the BRG1 chromatin remodeler subunit. However, it remains unclear whether the function of EBF1 is continuously required for stabilizing local chromatin accessibility. To this end, we replaced EBF1 by EBF1-FKBP in pro-B cells, allowing the rapid degradation by adding the degradation TAG13 (dTAG13) dimerizer. EBF1 degradation results in a loss of genome-wide EBF1 occupancy and EBF1-targeted BRG1 binding. Chromatin accessibility was rapidly diminished at EBF1-binding sites with a preference for sites whose occupancy requires the pioneering activity of the C-terminal domain of EBF1. Diminished chromatin accessibility correlated with altered gene expression. Thus, continuous activity of EBF1 is required for the stable maintenance of the transcriptional and epigenetic state of pro-B cells.</p>',
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<div id="p0010" role="paragraph">HIRA establishes greater telomeric chromatin accessibility after ATRX-DAXX loss</div>
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<div class="content">
<div id="p0015" role="paragraph">Deposition of new H3.3 by HIRA-UBN restricts telomeric ssDNA and TERRA R-loops</div>
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<div id="p0020" role="paragraph">Unresolved TERRA R-loops block new H3.3 deposition by HIRA-UBN</div>
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<div id="p0025" role="paragraph">CHK1 phosphorylation of H3.3 is critical to prevent ssDNA and TERRA R-loop buildup</div>
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<div id="abspara0010" role="paragraph">Inactivating mutations in chromatin modifiers, like the α-thalassemia/mental retardation, X-linked (ATRX)-death domain-associated protein (DAXX) chromatin remodeling/histone H3.3 deposition complex, drive the cancer-specific alternative lengthening of telomeres (ALT) pathway. Prior studies revealed that HIRA, another histone H3.3 chaperone, compensates for ATRX-DAXX loss at telomeres to sustain ALT cancer cell survival. How HIRA rescues telomeres from the consequences of ATRX-DAXX deficiency remains unclear. Here, using an assay for transposase-accessible chromatin using sequencing (ATAC-seq) and cleavage under targets and release using nuclease (CUT&RUN), we establish that HIRA-mediated deposition of new H3.3 maintains telomeric chromatin accessibility to prevent the detrimental accumulation of nucleosome-free single-stranded DNA (ssDNA) in ATRX-DAXX-deficient ALT cells. We show that the HIRA-UBN1/UBN2 complex deposits new H3.3 to prevent TERRA R-loop buildup and transcription-replication conflicts (TRCs) at telomeres. Furthermore, HIRA-mediated H3.3 incorporation into telomeric chromatin links productive ALT to the phosphorylation of serine 31, an H3.3-specific amino acid, by Chk1. Therefore, we identify a critical role for HIRA-mediated H3.3 deposition that ensures the survival of ATRX-DAXX-deficient ALT cancer cells.</div>
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<div id="p0010" role="paragraph">HNF1β mitotic site binding is preserved with a specific methanol/formaldehyde ChIP</div>
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<div id="p0015" role="paragraph">BTBD2, an HNF1β partner, mediates mitosis-specific interaction with TOP1</div>
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<div id="p0025" role="paragraph">An HNF1β mutation, found in MODY patients, disrupts the interaction with TOP1</div>
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<div id="abspara0010" role="paragraph">HNF1β (<i>HNF1B</i>) is a transcription factor frequently mutated in patients with developmental renal disease. It binds to mitotic chromatin and reactivates gene expression after mitosis, a phenomenon referred to as bookmarking. Using a crosslinking method that circumvents the artifacts of formaldehyde, we demonstrate that HNF1β remains associated with chromatin in a sequence-specific way in both interphase and mitosis. We identify an HNF1β-interacting protein, BTBD2, that enables the interaction and activation of Topoisomerase 1 (TOP1) exclusively during mitosis. Our study identifies a shared microhomology domain between HNF1β and TOP1, where a mutation, found in “maturity onset diabetes of the young” patients, disrupts their interaction. Importantly, HNF1β recruits TOP1 and induces DNA relaxation around HNF1β mitotic chromatin sites, elucidating its crucial role in chromatin remodeling and gene reactivation after mitotic exit. These findings shed light on how HNF1β reactivates target gene expression after mitosis, providing insights into its crucial role in maintenance of cellular identity.</div>
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'description' => '<p><span>Entomological sampling and storage conditions often prioritise efficiency, practicality and conservation of morphological characteristics, and may therefore be suboptimal for DNA preservation. This practice can impact downstream molecular applications, such as the generation of high-throughput genomic libraries, which often requires substantial DNA input amounts. Here, we use a practical Tn5 transposase tagmentation-based library preparation method optimised for 96-well plates and low yield DNA extracts from insect legs that were stored under sub-optimal conditions for DNA preservation. The samples were kept in field vehicles for extended periods of time, before long-term storage in ethanol in the freezer, or dry at room temperature. By reducing DNA input to 6ng, more samples with sub-optimal DNA yields could be processed. We matched this low DNA input with a 6-fold dilution of a commercially available tagmentation enzyme, significantly reducing library preparation costs. Costs and workload were further suppressed by direct post-amplification pooling of individual libraries. We generated medium coverage (>3-fold) genomes for 88 out of 90 specimens, with an average of approximately 10-fold coverage. While samples stored in ethanol yielded significantly less DNA compared to those which were stored dry, these samples had superior sequencing statistics, with longer sequencing reads and higher rates of endogenous DNA. Furthermore, we find that the efficiency of tagmentation-based library preparation can be improved by a thorough post-amplification bead clean-up which selects against both short and large DNA fragments. By opening opportunities for the use of sub-optimally preserved, low yield DNA extracts, we broaden the scope of whole genome studies of insect specimens. We therefore expect these results and this protocol to be valuable for a range of applications in the field of entomology.</span></p>',
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'description' => '<p><span>We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes, indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that did not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences meiotic sex chromosome gene regulation and DNA repair.</span></p>',
'date' => '2023-09-28',
'pmid' => 'https://www.biorxiv.org/content/10.1101/2023.05.25.542290v2.abstract',
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'authors' => 'Zou Han et al.',
'description' => '<p>How abnormal neurodevelopment relates to the tumour aggressiveness of medulloblastoma (MB), the most common type of embryonal tumour, remains elusive. Here we uncover a neurodevelopmental epigenomic programme that is hijacked to induce MB metastatic dissemination. Unsupervised analyses of integrated publicly available datasets with our newly generated data reveal that SMARCD3 (also known as BAF60C) regulates Disabled 1 (DAB1)-mediated Reelin signalling in Purkinje cell migration and MB metastasis by orchestrating cis-regulatory elements at the DAB1 locus. We further identify that a core set of transcription factors, enhancer of zeste homologue 2 (EZH2) and nuclear factor I X (NFIX), coordinates with the cis-regulatory elements at the SMARCD3 locus to form a chromatin hub to control SMARCD3 expression in the developing cerebellum and in metastatic MB. Increased SMARCD3 expression activates Reelin-DAB1-mediated Src kinase signalling, which results in a MB response to Src inhibition. These data deepen our understanding of how neurodevelopmental programming influences disease progression and provide a potential therapeutic option for patients with MB.</p>',
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<td style="width: 326px;">Tagmentase loaded</td>
<td style="width: 114px; padding-left: 30px;">2.5 µl</td>
</tr>
<tr>
<td style="width: 326px;"><span>Digitonin 1%</span></td>
<td style="width: 114px; padding-left: 30px;">0.5 µl</td>
</tr>
<tr>
<td style="width: 326px;">Tween20 10%</td>
<td style="width: 114px; padding-left: 30px;">0.5 µl</td>
</tr>
<tr>
<td style="width: 326px;">PBS</td>
<td style="width: 114px; padding-left: 30px;">16.5 µl</td>
</tr>
<tr>
<td style="width: 326px;">Nuclease-free water</td>
<td style="width: 114px; padding-left: 30px;"> 5 µl</td>
</tr>
<tr>
<td style="width: 326px;">Nuclei pellet*</td>
<td style="width: 114px;"></td>
</tr>
</tbody>
</table>
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<li>The tagmented libraries can then be purified using the MicroChIP DiaPure Columns (Cat. No. C03040001), and amplified.</li>
</ul>
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<li>The tagmented libraries can then be purified using the MicroChIP DiaPure Columns (Cat. No. C03040001), and amplified.</li>
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<table style="width: 447px;">
<tbody>
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<td style="width: 326px;">Tagmentation Buffer (2x)</td>
<td style="width: 114px; padding-left: 30px;">25 µl</td>
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<tr>
<td style="width: 326px;">Tagmentase loaded</td>
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</tr>
<tr>
<td style="width: 326px;"><span>Digitonin 1%</span></td>
<td style="width: 114px; padding-left: 30px;">0.5 µl</td>
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<td style="width: 326px;">Tween20 10%</td>
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</tr>
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<tr>
<td style="width: 326px;">Nuclease-free water</td>
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<td style="width: 114px;"></td>
</tr>
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<ul style="list-style-type: circle;">
<li>The reaction is then incubated 30 minutes at 37°C.</li>
<li>The tagmentation reaction can then be stopped by addition of 250 µl of DNA Binding buffer from Diagenode MicroChIP DiaPure Columns (Cat. No. C03040001).</li>
<li>The tagmented libraries can then be purified using the MicroChIP DiaPure Columns (Cat. No. C03040001), and amplified.</li>
</ul>
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'date' => '2022-11-01',
'pmid' => 'https://doi.org/10.1073%2Fpnas',
'doi' => '10.1073/pnas.2210595119',
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$externalLink = ' <a href="https://doi.org/10.1073%2Fpnas" target="_blank"><i class="fa fa-external-link"></i></a>'include - APP/View/Products/view.ctp, line 755
View::_evaluate() - CORE/Cake/View/View.php, line 971
View::_render() - CORE/Cake/View/View.php, line 933
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 963
ProductsController::slug() - APP/Controller/ProductsController.php, line 1052
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 491
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 193
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 118
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