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Bacterial RNA Polymerase00:43

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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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化学DNA-RNA配列を含む細菌ゲノム

Angad P Mehta1, Yiyang Wang1, Sean A Reed1

  • 1The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States.

Journal of the American Chemical Society
|August 31, 2018
PubMed
まとめ

科学者は大腸菌をリボヌクレオチドをゲノムに組み込み,有意なRNA含有量のキメリックゲノムを作成しました. この研究は細菌の遺伝物質組成の 根本的な限界を探るものです

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科学分野:

  • 分子生物学
  • 遺伝学
  • 合成生物学

背景:

  • RNA世界仮説は RNAが生命の初期に果たした役割を提唱している.
  • 触媒と複製を含む遺伝子型とフェノタイプの機能に対するRNAの潜在性は調査されています.
  • 以前の作業では,E. coliが2'-デオキシチジンを5'-ヒドロキシメチル-2'-デオキシチジンで置き換えた.

研究 の 目的:

  • バクテリアのゲノムにリボヌクレオチドが組み込まれていることを調査する.
  • 有意なゲノムリボヌクレオチド含有量を持つ大腸菌株を生成し,特徴づけること.
  • 大腸菌がRNAをDNAに統合する条件を理解する.

主な方法:

  • 大腸菌株の遺伝子組み換え
  • 2'-デオキシチジンを5'-ヒドロキシメチル-2'-デオキシチジンに置き換える
  • キメリックなゲノムを持つ変異株の生成

主要な成果:

  • ゲノムに約40~50%のリボヌクレオチドを含む変異した大腸菌株を成功裏に生成した.
  • これらの菌株はDNAとRNAの両方で構成されたキメリックゲノムを持っています.
  • これらの新しいゲノム構造とバクテリア株の初期特徴づけが始まっています.

結論:

  • 大腸菌は大量リボヌクレオチドを含むゲノムを持つように設計できます.
  • これらの発見は,混合RNA-DNAゲノムの性質と進化を研究するための道を開きます.
  • リボヌクレオチドの組み込みのメカニズムと影響を完全に解明するには,さらなる研究が必要です.