バクテリアの結合性プラズミッドは,バクテリアと酵母菌の間のDNA転送を動員します
1Institute of Molecular Biology, University of Oregon, Eugene 97403.
Nature
|July 20, 1989
まとめ
Escherichia coliの結合性プラズミッドは,DNAを酵母に転送することができます. この王国間のDNA転送は,バクテリアの結合特性を共有しており,進化的に重要な可能性がある.
科学分野:
- 微生物学 微生物学とは
- 遺伝学 遺伝学とは
- イースト生物学 イースト生物学
背景:
- エシェリキア・コライ (E. coli) は,結合性プラズミドを介して遺伝物質を転送する能力で知られている細菌です.
- プラズミッドは,細菌細胞内で独立して複製できる染色体外DNA要素です.
- 結合は,バクテリアにおける水平遺伝子転送の重要なメカニズムである.
研究 の 目的:
- 細菌の結合性プラズミドが,真核生物,Saccharomyces cerevisiae (酵母) にDNA転送を媒介する能力を調査する.
- バクテリアの結合と,この観察されたトランスキングダムDNA転送の間のメカニズム的類似性を探求する.
- このような王国間の遺伝子交換の潜在的な進化的意義を評価する.
主な方法:
- DNA動員のために設計されたEscherichia coliの結合性プラズミッドを使用しています.
- これらのプラズミドを制御された実験室条件下で酵母 (Saccharomyces cerevisiae) に導入する.
- E. coli から酵母へのDNA伝播の特性と効率を分析する.
主要な成果:
- 結合性プラズミドによって媒介されたEscherichia coliからSaccharomyces cerevisiaeにDNAを成功裏に動員することが実証されました.
- DNA伝達プロセスは,バクテリアの結合といくつかの重要な特徴を共有していることが観察されました.
- 細菌と酵母菌の間の遺伝子交換の可能性を特定しました.
結論:
- E. coli の結合性プラズミッドは,酵母へのDNA転送を媒介する能力があります.
- 観察されたトランス・キングダム DNA 転送は,バクテリアの結合に類似する特徴を示しています.
- このプロセスは,生命の異なる王国における遺伝的交換を促進するための潜在的な進化的意義を持っています.
関連する概念動画
01:28Yeast Signaling
Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
01:33Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
01:33Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
01:26Transformation
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
01:19Conjugation
Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
01:19Mechanism of Conjugation
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...