関連する実験動画
Updated: Jul 6, 2026

08:35
Detecting Cortex Fragments During Bacterial Spore Germination
Published on: June 25, 2016
酵母菌の細胞成長と分裂を組み合わせる経路を体系的に特定する
Paul Jorgensen1, Joy L Nishikawa, Bobby-Joe Breitkreutz
1Department of Medical Genetics and Microbiology, University of Toronto, Toronto, Ontario, Canada M5S 1A8.
まとめ
研究者らは,酵母細胞の細胞サイズに影響する500の遺伝子消去株を特定し,リボソームの生体生成と細胞の成長と分裂のタイミングを結びつけるSfp1のような新しい因子を明らかにした.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- 細胞サイズのコントロールは,細胞サイクル進行において極めて重要です.
- 芽生える酵母 (Saccharomyces cerevisiae) は,細胞分裂 (Start) を始める前に,臨界サイズに達しなければならない.
研究 の 目的:
- スタート時に重要な細胞サイズを調節する遺伝子を特定する.
- 細胞サイズホメオスタシスを支配する要因のネットワークを理解する.
主な方法:
- 約6000種のSaccharomyces cerevisiaeの遺伝子消去株を体系的にスクリーニングした.
- 小型 (whi) と大型 (lge) ミュータントを特定するために,細胞サイズ分布の分析.
- 規制ネットワークを明らかにするための遺伝子解析.
主要な成果:
- 約500の遺伝子消去株は異常な細胞サイズを示した.
- Sfp1,Sch9,Cdh1,Prs3,およびWhi5.5を含む重要な細胞サイズの主なレギュレータを特定しました.
- 発見されたSfp1は,少なくとも60のリボソーム組立遺伝子を調節することによって,リボソームの生体生成を細胞サイズと結びつける.
結論:
- 細胞の大きさは,複雑な遺伝ネットワークによって制御されます.
- リボソーム生物生成は,細胞サイズを決定する主要な要因です.
- 細胞の成長と分裂は,保存されたメカニズムを通して結合されます.
関連する概念動画
Binary Fission
Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
Distribution of Cytoplasmic Content
Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of small...
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of small...
Microbial Fermentation
Fermentation is a crucial anaerobic metabolic process that enables microbes to derive energy from sugar without relying on oxygen or an electron transport chain. This process is fundamental to various biological and industrial applications and is classified based on the metabolic products generated.Role of Pyruvate in FermentationPyruvate and its derivatives serve as key electron acceptors in fermentative pathways. The oxidation of NADH to regenerate NAD+ is essential for the continuation of...
Binary Fission
Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
Methods of Classification and Identification
Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
Microbes in Food Production
Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...

