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関連する概念動画

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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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 Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
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Neuroplasticity01:01

Neuroplasticity

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Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.
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Heterochromatin02:38

Heterochromatin

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Author Spotlight: Enhancements in Gene Expression Regulation Research
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クロマチンの可塑性は,記憶の痕跡形成のためのニューロンの適性を事前に決定する.

Giulia Santoni1, Simone Astori2, Marion Leleu3

  • 1Laboratory of Neuroepigenetics, Brain Mind Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|July 25, 2024
PubMed
まとめ

神経細胞の表遺伝子状態 特にクロマチンの可塑性は 記憶を形成する能力を決定します この可塑性を高めることで 記憶のエンコーディングに より多くのニューロンを集め 記憶形成に 重要な役割を果たします

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Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue

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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
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科学分野:

  • 神経科学
  • エピジェネティクス
  • 分子生物学

背景:

  • 記憶のエンコーディングには 特定のニューロンの集団が関与します
  • 記憶の痕跡にニューロンの採用を制御するメカニズムは完全に理解されていません.
  • 細胞の機能と可塑性には表遺伝的変異が作用する.

研究 の 目的:

  • 記憶のエンコーディングのためのニューロンの募集における表遺伝子状態の役割を調査する.
  • クロマチンの可塑性と 記憶の痕跡の形成の関係を探るため
  • エピジェネティック・モディフィケーションが セル・オートノムでメモリ・エンコードするかどうかを判断する.

主な方法:

  • マウスの側桃体主ニューロンにおける表遺伝子状態 (クロマチンの可塑性) を調べた.
  • クロマチンの可塑性を 実験的に操作した
  • ニューロンの興奮度をリアルタイムで測定した.
  • エピジェネティックに変化したニューロンを 黙らせた

主要な成果:

  • 記憶の符号化のためのニューロンの適格性は,既にある表遺伝子状態に依存します.
  • クロマチンの可塑性が高まり 神経細胞の記憶集積が強化された.
  • クロマチンの可塑性は,シナプス性可塑性に関連するゲノム領域で発生した.
  • ニューロンの興奮性の増加がリアルタイムで観察されました.
  • エピジェネティックに変化したニューロンを静止させると 記憶の表現が損なわれます

結論:

  • エピジェネティック状態,特にクロマチンの可塑性は,メモリエンコーディングのためのニューロンの採用の重要な決定因子です.
  • 神経細胞におけるクロマチンの可塑性は細胞自律性であり,記憶の痕跡形成に直接影響する.
  • これらの発見は エピジェネティクスと記憶形成を結びつける 新しいメカニズムを明らかにしています