Video Experimental Relacionado
Updated: May 5, 2026

07:14
Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
Published on: September 20, 2019
7.8K
La progresión del ciclo celular a través de la mitosis conduce al aborto de las transcripciones nacientes
1Department of Biochemistry & Biophysics, University of California, San Francisco 94143-0448.
Cell
|October 18, 1991
Resumen
La mitosis causa el aborto de las transcripciones nacientes para el gen Drosophila Ubx. Este aborto periódico puede regular la expresión de genes grandes durante el ciclo celular.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
Sus antecedentes:
- El gen Ubx en Drosophila es crucial para el desarrollo embrionario.
- Comprender la regulación génica durante el ciclo celular es esencial para los procesos de desarrollo.
Objetivo del estudio:
- Para investigar el destino de las transcripciones nacientes durante la mitosis en Drosophila.
- Explorar el papel de la progresión del ciclo celular en la regulación de la expresión génica.
Principales métodos:
- Se utilizó la hibridación in situ para detectar transcripciones nacientes del gen Ubx.
- Visualización de la progresión de la ARN polimerasa a través del gen a una velocidad de 1,4 kb/min.
- Análisis del comportamiento de transcripción en embriones de Drosophila mutantes de tipo salvaje y de ciclo celular detenido.
Principales resultados:
- Se detectaron transcripciones de Ubx nacientes y se visualizó su progresión.
- Las transcripciones desaparecieron al entrar en la mitosis.
- En una interfase de bloqueo mutante, las transcripciones se observaron continuamente.
- La reaparición de las transcripciones en el siguiente ciclo celular mostró un retraso temporal consistente con la velocidad de transcripción.
Conclusiones:
- La progresión mitótica conduce al aborto de las transcripciones nacientes.
- El aborto periódico de la transcripción puede ser un mecanismo regulador para los genes grandes.
- El control del ciclo celular influye en la expresión de genes clave del desarrollo como Ubx.
Videos de Conceptos Relacionados
Nonsense-mediated mRNA Decay
9.4K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
9.4K
The Cell Cycle Control System
12.0K
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...
12.0K
Replicative Cell Senescence
3.5K
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.5K
Separation of Sister Chromatids
3.6K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.6K
Meiosis vs. Mitosis
39.6K
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...
39.6K
The Cell Cycle Control System
5.1K
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...
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...
5.1K

