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Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

7.9K
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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Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
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Epigenetic Regulation01:46

Epigenetic Regulation

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Epigenetic Regulation01:37

Epigenetic Regulation

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Epigenetic Regulation01:46

Epigenetic Regulation

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Inheritance01:25

Inheritance

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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype...
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Updated: Apr 15, 2026

Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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エピジェネティクス. 配列特異的募集から切り離されたエピジェネティック遺伝.

Kaushik Ragunathan1, Gloria Jih1, Danesh Moazed2

  • 1Department of Cell Biology, Howard Hughes Medical Institute, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.

Science (New York, N.Y.)
|April 2, 2015
PubMed
まとめ

ヒストンの改変は,DNA配列とは無関係に表遺伝子情報を運ぶことができる. 分裂酵母では,ヒストンH3ライシン9メチル化 (H3K9me) ドメインが細胞分裂にわたって遺伝され,表遺伝子遺伝の"読み書き"メカニズムを示しています.

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科学分野:

  • エピジェネティクス エピジェネティクス
  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは

背景:

  • ヒストンの翻訳後の改変によって特徴づけられるエピジェネティック状態は,遺伝子発現パターンを調節する.
  • DNA配列,メチル化,またはRNA干渉とは別にヒストンの改変を介して表遺伝子情報の独立した伝播は,依然として十分に理解されていません.

研究 の 目的:

  • エピジェネティック情報が,DNA配列,DNAメチル化,またはRNA干渉とは無関係にヒストンの改変によって伝達できるかどうかを調査する.
  • 分裂酵母における表遺伝情報遺伝のメカニズムを解明する.

主な方法:

  • Schizosaccharomyces pombe.でヒストンH3ライシン9メチル化 (H3K9me) の外因的に誘発されたドメイン.
  • 遺伝を評価するために,シーケンス固有のイニシアターを取り除く.
  • H3K9meドメインの維持におけるEpe1 (H3K9脱メチラーゼ) とClr4 (H3K9メチルトランスフェラーゼ) の役割の分析.

主要な成果:

  • エクトピカルに誘発されたH3K9meドメインは,イニシアターを除去した後,複数のミトーシスおよびメヨーシス細胞分裂を通じて遺伝されました.
  • H3K9デメチラーゼEpe1とH3K9メチルトランスフェラーゼClr4は,静かなH3K9meドメインを維持する上で敵対的な役割を果たしています.
  • Clr4がヒストンの改変を伝播する際に関与する直接的な"読み書き"メカニズムを示した.

結論:

  • ヒストンの改変,特にH3K9meは,表遺伝情報の媒介者として機能する.
  • H3K9meドメインの遺伝は,DNA配列から独立して表遺伝子記憶のメカニズムを示唆しています.
  • H3K9メチルトランスフェラーゼとデメチラーゼの相互作用は,表遺伝子状態を維持するために重要である.