Video Experimental Relacionado

Updated: Apr 16, 2026

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Investigating Flagella-Driven Motility in Escherichia coli by Applying Three Established Techniques in a Series

Published on: May 10, 2020

La evolución, la evolución de las cosas. Resurrección evolutiva de la motilidad flagelar a través de la reconexión

Tiffany B Taylor¹, Geraldine Mulley¹, Alexander H Dills²

¹School of Biological Sciences, University of Reading, Whiteknights, Reading RG6 6AJ, UK.

Science (New York, N.Y.)

|February 28, 2015

Resumen

Las bacterias desarrollaron rápidamente la motilidad mediante la reconfiguración de las redes reguladoras de genes. Las mutaciones en el gen regulador NtrC permitieron que los fluorescentes de Pseudomonas inmóviles recuperaran los flagelos a través de un proceso evolutivo de dos pasos.

Área de la Ciencia:

Biología evolutiva Biología evolutiva.
Genética microbiana genética de los microbios.
Biología molecular La biología molecular.

Sus antecedentes:

Las redes reguladoras de genes son fundamentales para la evolución.
Las cepas inmóviles de Pseudomonas fluorescens fueron diseñadas eliminando el gen fleQ.

Objetivo del estudio:

Para investigar la vía evolutiva para la recuperación de las flagelas en Pseudomonas fluorescens.
Comprender cómo la selección natural recablea las redes reguladoras de los genes.

Principales métodos:

Cepas bacterianas inmóviles diseñadas (Pseudomonas fluorescens sin fleQ).
Se aplicó una fuerte selección para la motilidad.
Analizó los pasos evolutivos y las mutaciones genéticas durante 96 horas.

Principales resultados:

Las bacterias recuperaron los flagelos en 96 horas a través de una vía evolutiva repetible de dos pasos.
Paso 1: Las mutaciones aumentaron el NtrC fosforilado, secuestrando el regulón fleQ e interrumpiendo el metabolismo del nitrógeno.
Paso 2: Una mutación de interruptor de función en NtrC lo redirigió a la regulación flagelar.

Conclusiones:

La selección natural puede recablear rápidamente las redes reguladoras de genes.
Las vías evolutivas pueden implicar un número mínimo de pasos mutacionales repetibles.
La duplicación de genes y el reclutamiento de redes reguladoras son procesos evolutivos clave.

Más Videos Relacionados

Biophysical Characterization of Flagellar Motor Functions

Biophysical Characterization of Flagellar Motor Functions

Published on: January 18, 2017

Reactivation of Demembranated Cell Models in Chlamydomonas reinhardtii

Reactivation of Demembranated Cell Models in Chlamydomonas reinhardtii

Published on: May 6, 2022

Videos de Conceptos Relacionados

Flagella and Motility in Bacteria

Flagella and Motility in Bacteria

Flagella are specialized, thread-like structures that extend from a bacteria's cell envelope. They play a crucial role in motility and chemotaxis. Their structural organization and functioning exemplify sophisticated biological engineering, enabling bacterial survival and adaptability in diverse environments.Structure of the FlagellumA bacterial flagellum consists of three key components: the filament, the hook, and basal body. The filament, a long, helical structure composed of repeating...

Evolution of New Traits in Microbes

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...

Microtubules in Cell Motility

Microtubules in Cell Motility

Microtubules are thick hollow cylindrical proteins that help form the cytoskeleton. Microtubules have varied roles in the cell. These filaments help form cellular appendages like cilia and flagella, which are responsible for locomotion. The cilia arise from basal bodies, separated from the main body by a membrane-like structure forming the transition zone. This zone is the gate for the entry of lipids and proteins, creating a unique composition of lipids and proteins in the ciliary membrane and...

Microtubules in Cell Motility

Microtubules in Cell Motility

Chemotaxis in E. coli

Chemotaxis in E. coli

Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...

Fimbriae, Pili, and Axial Filaments

Fimbriae, Pili, and Axial Filaments

Fimbriae and pili are specialized bacterial surface structures that play pivotal roles in adhesion, genetic exchange, and motility. Composed primarily of pilin protein, these hairlike appendages are crucial for bacterial survival and pathogenicity in various environments.Fimbriae: Adhesion and PathogenicityFimbriae are fine, filamentous structures measuring 2–10 nanometers in diameter and are densely distributed on the bacterial cell surface. They facilitate bacterial adhesion to abiotic...