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関連する概念動画

Spreading of Chromatin Modifications02:25

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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.
Writers
The writer...
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RNA Polymerase II Accessory Proteins02:36

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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Exon Recombination02:32

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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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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Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
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射程拡張器は長距離増強器の活動を媒介する.

Grace Bower1, Ethan W Hollingsworth1,2, Sandra H Jacinto1

  • 1Department of Developmental and Cell Biology, University of California Irvine, Irvine, CA, USA.

Nature
|July 3, 2025
PubMed
まとめ
この要約は機械生成です。

科学者たちは新しいDNA要素である 範囲拡張器 (REX) を発見し 増強剤は メガベスの距離を超えて 遺伝子を制御することができます この発見は 哺乳類における 長期的な遺伝子調節の仕組みを明らかにし 発達に極めて重要です

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Last Updated: Sep 17, 2025

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科学分野:

  • 発達生物学
  • 遺伝学
  • 分子生物学

背景:

  • 哺乳類の転写強化剤は通常,遺伝子プロモーターを数十キロベースで調節する.
  • しかし,いくつかの増強剤はメガベース距離で機能するが,その背後にある配列の特徴は不明である.

研究 の 目的:

  • 長距離の強化剤と促進剤の相互作用を可能にするシーケンスの特徴を特定する.
  • 哺乳類の発達における長距離遺伝子調節のメカニズムを調査する.

主な方法:

  • ネズミの"SHH LOCUS"でのインビオ増強剤置換実験
  • REX要素の識別と特徴付け
  • REX要素とZRS増強体内の保存モチーフの変異分析
  • 足の発達を評価するためのノックインマウスの生成

主要な成果:

  • 短距離および中距離の肢体強化剤は,長距離での遺伝子発現を活性化することはできません.
  • 新種のシス作用要素であるREXは,長距離の制御作用を与える.
  • REXを他の強化剤に添加すると,その相互作用範囲は最大数値まで増加した.
  • REX内の保存された [C/T]AATTAホメオドメインモチーフは,その活動に不可欠であり,長距離の肢体強化剤で充実しています.
  • これらのモチーフの変異により,ZRS増強剤の長距離活性がなくなり,極端な肢体縮小を引き起こした.

結論:

  • REX要素は,リモート強化器による遠隔アクティベーションを与えるのに必要で十分です.
  • [C/T]AATTAモチーフを含む特定のシーケンスのシグネチャーは,長距離強化剤-促進剤の相互作用と関連しています.
  • この発見は,哺乳類の発達中の長距離遺伝子調節のメカニズムに重要な洞察をもたらします.