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To identify the pathway of mitotic chromosome formation, we combined imaging and Hi-C analysis of synchronous DT40 cell cultures with polymer simulations. Here we show that in prophase, the interphase organization is rapidly lost in a condensin-dependent manner, and arrays of consecutive 60-kilobase (kb) loops are formed. During prometaphase, ~80-kb inner loops are nested within ~400-kb outer loops. The loop  array acquires a helical arrangement with consecutive loops emanating from a central \"spiral staircase\" condensin scaffold. The size of helical turns progressively increases to ~12 megabases during prometaphase. Acute depletion of  condensin I or II shows that nested loops form by differential action of the two  condensins, whereas condensin II is required for helical winding.", "ID": "PMID:29348367", "uuid": "84fa5633-aac7-4cb3-b53b-0f0234ea06dd", "title": "A pathway for mitotic chromosome formation.", "display_title": "Gibcus JH et al. 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The loop  array acquires a helical arrangement with consecutive loops emanating from a central \"spiral staircase\" condensin scaffold. The size of helical turns progressively increases to ~12 megabases during prometaphase. Acute depletion of  condensin I or II shows that nested loops form by differential action of the two  condensins, whereas condensin II is required for helical winding.", "short_attribution": "Gibcus JH et al. (2018)", "display_title": "Gibcus JH et al. (2018) PMID:29348367", "uuid": "84fa5633-aac7-4cb3-b53b-0f0234ea06dd", "title": "A pathway for mitotic chromosome formation.", "authors": ["Gibcus JH", "Samejima K", "Goloborodko A", "Samejima I", "Naumova N", "Nuebler J", "Kanemaki MT", "Xie L", "Paulson JR", "Earnshaw WC", "Mirny LA", "Dekker J"], "@id": "/publications/84fa5633-aac7-4cb3-b53b-0f0234ea06dd/", "ID": "PMID:29348367", "date_published": "2018-02-09", "@type": ["Publication", "Item"], "principals_allowed": {"view": ["system.Everyone"], "edit": ["group.admin"]}}], "experiment_categorizer": {"field": "Enzyme", "value": "HindIII", "combined": "Enzyme: HindIII"}, "experiment_summary": "Dilution Hi-C on DT40 with random integration of GFP and AID-tagged CAP-H2 gene, NCAPH2 disruption, random integration of X. laevis Cdk1, CDK1 disruption with HindIII", "@context": "/terms/", "aggregated-items": {"badges": [{"parent": "/biosamples/4DNBSHF1PY4I/", "embedded_path": "biosample.badges", "item": {"messages": ["Biosample missing Cell Culture Details"], "badge": {"commendation": null, "warning": "Biosample Metadata Incomplete", "uuid": "2b2cc7ff-b7a8-4138-9a6c-22884fc71690", "@id": "/badges/biosample-metadata-incomplete/", "badge_icon": "/static/img/badges/biosample-icon.svg", "description": "Biosample is missing metadata information required as part of the standards implemented by the 4DN Samples working group."}}}]}, "validation-errors": []}