Video Experimental Relacionado
Updated: Jul 7, 2026
07:47
Microscopy of Fission Yeast Sexual Lifecycle
Published on: March 9, 2016
Conservación de los controles mitóticos en la fisión y las levaduras en ciernes
P Russell1, S Moreno, S I Reed
1Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.
Cell
|April 21, 1989
Resumen
El estudio encontró que la levadura de fisión
Área de la Ciencia:
- Biología celular Biología celular.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El inicio de la mitosis está regulado por inductores e inhibidores mitóticos opuestos.
- Comprender la conservación de esta red de control a través de los eucariotas es crucial.
Objetivo del estudio:
- Para investigar si una red de control mitótico similar opera en la levadura en ciernes (S. cerevisiae).
- Para determinar la conservación de la levadura de fisión (S. pombe) el sistema de control mitótico.
Principales métodos:
- Gen wee1+ de levadura de fisión expresado en S. cerevisiae.
- Identificó y caracterizó el gen MIH1 de S. cerevisiae, un homólogo de cdc25+.
- Estudió los efectos de la expresión de wee1+ en una cepa de mih1-S. cerevisiae.
Principales resultados:
- La wee1+ de la levadura de fisión retrasa el inicio de la mitosis cuando se expresa en S. cerevisiae.
- S. cerevisiae MIH1 contrarresta la actividad wee1+, actuando como un inductor mitótico.
- La expresión de wee1+ en una cepa mih1 previene el inicio de la mitosis en S. cerevisiae.
Conclusiones:
- Las características clave de la red de control mitótico cdc25+-wee1+ de S. pombe se conservan en S. cerevisiae.
- Esto sugiere la conservación general de los mecanismos de control mitótico de los eucariotas.
Videos de Conceptos Relacionados
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...
02:11The Cell Cycle Control System
The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
02:36Cells Coordinate Growth and Proliferation
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
02:57Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
02:57Meiosis vs. Mitosis
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
01:28The Cell Cycle Control System
The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...