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Overview of Hematopoiesis01:20

Overview of Hematopoiesis

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Hematopoiesis, or blood cell production, is a vital biological process that begins early in embryonic development and continues throughout life. This process generates the various types of cells found in blood, including red blood cells, white blood cells, and platelets from hematopoietic stem cells (HSCs).
Developmental Phases of Hematopoiesis
Initially, HSCs are formed in the embryonic yolk sac, a critical site for early blood cell production. These stem cells subsequently migrate to other...
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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

3.4K
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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Lineage Commitment01:21

Lineage Commitment

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Commitment is the  process whereby stem cells:
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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Chromatin Immunoprecipitation ChIP in Mouse T-cell Lines
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免疫遺伝学 免疫遺伝学について 血液形成中のクロマチン状態の動態

David Lara-Astiaso1, Assaf Weiner2, Erika Lorenzo-Vivas1

  • 1Department of Immunology, Weizmann Institute of Science, Rehovot, Israel.

Science (New York, N.Y.)
|August 9, 2014
PubMed
まとめ

この研究は,血液細胞の発達中のクロマチンの改変ダイナミクスをマッピングし,新しい増強剤が発達制御のために細胞特異の遺伝子発現を確立し,駆動する方法を明らかにしています.

さらに関連する動画

Chromatin Immunoprecipitation ChIP to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells
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Chromatin Immunoprecipitation ChIP to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells

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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches

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関連する実験動画

Last Updated: Apr 26, 2026

Chromatin Immunoprecipitation ChIP in Mouse T-cell Lines
11:39

Chromatin Immunoprecipitation ChIP in Mouse T-cell Lines

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Chromatin Immunoprecipitation ChIP to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells
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Chromatin Immunoprecipitation ChIP to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells

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Combining Intravital Fluorescent Microscopy IVFM with Genetic Models to Study Engraftment Dynamics of Hematopoietic Cells to Bone Marrow Niches
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科学分野:

  • 発達生物学 発達生物学について
  • エピジェネティクス エピジェネティクス
  • 血液形成の研究研究 血液形成研究

背景:

  • クロマチンの改変は発達に不可欠ですが,細胞の分化過程におけるそれらの動的変化は,まだ十分に理解されていません.
  • 血液形成 (血液細胞形成) は,発達動態を研究するための確立されたモデルですが,技術的な課題が純粋な細胞集団の分析を妨げています.
  • クロマチンのダイナミクスを理解することは,発達過程と細胞の運命決定の解読の鍵です.

研究 の 目的:

  • 血液形成区分の16の異なる段階における4つの主要な染色体改変の動的変化をプロファイルする.
  • 血液細胞発達の過程でエンハンスター領域とそのダイナミックな振る舞いを特定し,特徴づけること.
  • 染色体ダイナミクスを支配する転写因子ネットワークの解明と,血液形成における系統の仕様.

主な方法:

  • 高感度,インデックス・ファースト・クロマチン・イムノプレシピテーション (ChIP) 技術の開発.
  • 染色体変異のダイナミクスのプロファイリング 16の血液生成分化段階.
  • 強化剤カタログデータを遺伝子発現プロファイルと統合する.

主要な成果:

  • 48,415の強化区域の特定とダイナミックな特徴付け.
  • 17,035の系統特異増強剤の発見は,系統のコミットメント中に新たに確立されました.
  • 増強剤の膨張が微分化された細胞の転写プログラムに先行し,予測することを実証.
  • 染色質の動態と系統の仕様を制御する転写因子ネットワークの解明.

結論:

  • この研究は,血液形成の発達中のクロマチンのダイナミクスの包括的なモデルを提供します.
  • ダイナミックエンハンサーの確立は,系統の仕様と転写制御のための重要なメカニズムです.
  • この発見は,発達中の細胞運命を決定するエピジェネティック・レギュレーションに関する新しい洞察を提供します.