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Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

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A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
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A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae

Published on: April 25, 2015

ゲノムを縮小した細菌のトランスクリプトームの複雑さ

Marc Güell1, Vera van Noort, Eva Yus

  • 1Centre for Genomic Regulation (CRG), Universitat Pompeu Fabra, Barcelona, Spain.

Science (New York, N.Y.)
|December 8, 2009
PubMed
まとめ
この要約は機械生成です。

この研究は,Mycoplasma pneumoniaeにおける細菌のトランスクリプトームの複雑さを明らかにし,数多くの新しいトランスクリプトとオペロンを明らかにしました. この発見は,以前に理解されていたよりも,よりダイナミックでユーカリオットのような遺伝子調節を示唆しています.

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Generation of Enterobacter sp. YSU Auxotrophs Using Transposon Mutagenesis
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Generation of Enterobacter sp. YSU Auxotrophs Using Transposon Mutagenesis

Published on: October 31, 2014

Purifying the Impure: Sequencing Metagenomes and Metatranscriptomes from Complex Animal-associated Samples
11:23

Purifying the Impure: Sequencing Metagenomes and Metatranscriptomes from Complex Animal-associated Samples

Published on: December 22, 2014

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Last Updated: Jun 18, 2026

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
10:18

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae

Published on: April 25, 2015

Generation of Enterobacter sp. YSU Auxotrophs Using Transposon Mutagenesis
13:31

Generation of Enterobacter sp. YSU Auxotrophs Using Transposon Mutagenesis

Published on: October 31, 2014

Purifying the Impure: Sequencing Metagenomes and Metatranscriptomes from Complex Animal-associated Samples
11:23

Purifying the Impure: Sequencing Metagenomes and Metatranscriptomes from Complex Animal-associated Samples

Published on: December 22, 2014

科学分野:

  • 微生物学 微生物学とは
  • 分子生物学は分子生物学である.
  • ゲノミクスゲノミクスとは

背景:

  • バクテリアのトランスクリプトームの組織を理解することは,遺伝子調節を解読する上で極めて重要です.
  • ミニマルな自己複製する生物であるMycoplasma pneumoniaeは,基本的な生物学的原理のモデルとして機能しています.

研究 の 目的:

  • 細菌におけるトランスクリプトーム組織の基本的原理を調査する.
  • マイコプラズマ肺炎のトランスクリプトームの複雑性と動態を特徴づける.

主な方法:

  • ストランド固有のタイリング配列とトランスクリプトーム配列が採用されました.
  • 総合的な分析のために252以上のスポット配列が利用されました.
  • 分析は,新しいトランスクリプト,オペロン,およびトランスクリプション単位を特定することに焦点を当てました.

主要な成果:

  • 117の以前に記述されていないトランスクリプトが検出され,89のアンチセンセスの構成が検出されました.
  • 341のオペロンが特定され,そのうち139のポリシストロニックオペロンは発現パターンが衰退している.
  • 447の小さな転写単位と多数の代替転写が様々な条件下で発見されました.

結論:

  • Mycoplasma pneumoniaeのトランスクリプトームは高度にダイナミックで,反意味と代替トランスクリプトが頻繁に見られます.
  • 観察された複雑さは,以前に想定していたよりも,エウカリオットに似ている遺伝子調節システムを示唆しています.
  • この研究は,細菌の遺伝子発現と調節に関する私たちの理解を前進させます.