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DNA Microarrays02:34

DNA Microarrays

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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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FOXP3は,マルチメリゼーションを通じてマイクロサテライトを認識し,DNAをブリッジする

Wenxiang Zhang1,2, Fangwei Leng1,2, Xi Wang1,2

  • 1Howard Hughes Medical Institute and Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA.

Nature
|November 29, 2023
PubMed
まとめ

FOXP3タンパク質はマイクロサテライトで高級マルチメーターを形成し,新しいDNA認識メカニズムを明らかにします. この発見はFOXP3を明確にします.

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科学分野:

  • 分子生物学
  • 免疫学
  • 遺伝学

背景:

  • FOXP3は炎症と自己免疫を制御する T細胞の発達に不可欠です.
  • FOXP3機能の正確な分子メカニズムは,ほとんど不明です.
  • FOXP3のDNA結合を理解することは,免疫調節におけるその役割の鍵です.

研究 の 目的:

  • FOXP3のDNA結合と転写制御の分子メカニズムを解明する.
  • FOXP3がマイクロサテライトのDNA配列と どのように相互作用するかを調査する.
  • 調節性T細胞におけるFOXP3の機能の構造的基礎を決定する.

主な方法:

  • FOXP3-DNA複合体の構造を決定するための冷凍電子顕微鏡 (冷凍-EM).
  • FOXP3ドメインの機能的重要性を評価するためのサイト指向型変異.
  • DNA結合とT細胞の調節機能を評価するためのインビトロおよび細胞測定法.

主要な成果:

  • FOXP3は,梯子のようなアーキテクチャを採用したTnGリピートマイクロサテライトで高級マルチメーターを形成します.
  • フォークヘッドドメインは この多重化を介し,DNA分子を橋渡しします.
  • マルチメリゼーションに影響する変異は,コンセンサスモチーフ結合に影響を与えることなく,DNA認識と細胞機能を損なう.
  • FOXP3は,柔軟な間隔により,TnGのような配列に対する幅広い特異性を示しています.

結論:

  • FOXP3は,マイクロサテライトのホモマルチメリゼーションとDNAブリッジングを含む新しいDNA認識モードを使用しています.
  • マイクロサテライトは,転写調節と疾患の病原性において重要な役割を果たします.
  • この発見は 免疫調節と自己免疫疾患の 分子基盤に 新たな洞察をもたらします