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関連する概念動画

Somatic to iPS Cell Reprogramming01:29

Somatic to iPS Cell Reprogramming

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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Renewal of Skin Epidermal Stem Cells01:12

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The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular...
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Methods of Nuclear Reprogramming01:24

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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Histone Modification02:32

Histone Modification

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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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Inheritance of Chromatin Structures03:17

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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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エピジェネティックな若返り の 生物 物理学

Prim B Singh1

  • 1Department of Biomedical Sciences, School of Medicine, Nazarbayev University, 5/1 Kerei, Zhanibek Khandar Street, Astana 010000, Kazakhstan.

Cells
|August 27, 2025
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まとめ
この要約は機械生成です。

新しい研究は,細胞における表遺伝子年齢 (eAge) とシャノンエントロピーを,フロリー・ハギンスパラメータ (χ) と関連付けています. 細胞の老化に伴い χは減少しますが エピジェネティック再生によって 回復し 重要な老化ダイナミクスを明らかにします

キーワード:
フロリー・ハギンズパラメータH3K27me3 についてH3K9me3 についてHi-C についてシャノンエントロピー年齢再プログラム年齢エピジェネティック・リユヴェネーション部分的な再プログラム

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Evaluation of Injury-induced Senescence and In Vivo Reprogramming in the Skeletal Muscle
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科学分野:

  • 統合生物学
  • 計算式生体物理学
  • エピジェネティクス

背景:

  • フロリー・ハギンズパラメータ (χ) はポリマー物理学において極めて重要であるが,その核関連性は十分に探求されていない.
  • エピジェネティック・ドリフトと 景観の変化は 細胞の老化の特徴です
  • シャノンエントロピーは 情報の乱れを定量化し 生物学的複雑性との関連性を示します

研究 の 目的:

  • フロリー・ハギンズパラメータ (χ),表遺伝年齢 (eAge) とシャノンエントロピーの間の新しい関係を確立する.
  • 原子核環境内のポリマーの熱力学的振る舞いを探求する.
  • 細胞の老化と若返りによるこれらのパラメータへの影響を調査する.

主な方法:

  • 核の状況で χ を推定するための理論的枠組み.
  • ポリマー物理学,機械学習,表遺伝学の概念を統合する.
  • エピジェネティック・ドリフトと若返りが χ,eAge,Shannonエントロピーにどのように影響するかを分析.

主要な成果:

  • χ と eAge (χeAge−1) の間の直接的比例が示されている.
  • χ とシャノンエントロピー (χ シャノンエントロピー−1) の関係を確立した.
  • エピジェネティック・ドリフトは χを減らし,若返りがそれを回復することを示した.

結論:

  • エピジェネティック・エイジングとエントロピーは 核におけるフロリー・ハギンズパラメータの重要な決定因子です
  • 細胞の老化は,表遺伝的景観の平滑化による χの減少につながります.
  • エピジェネティック再生は これらの変化を逆転させ 老化と潜在的な介入を理解するためのメカニズムを強調します