Video Experimental Relacionado
Updated: May 5, 2026
08:48
Targeted in Situ Mutagenesis of Histone Genes in Budding Yeast
Published on: January 26, 2017
15.5K
La represión de la histona H2B causa la detención específica del ciclo celular en la levadura: efectos sobre la
Cell
|February 27, 1987
Resumen
El bloqueo de la síntesis de ARNm histona H2B en levaduras detiene la división celular y altera la estructura de la cromatina. Sin embargo, la replicación y la transcripción del ADN continúan, revelando complejas dependencias celulares de las histonas.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Biología celular Biología celular.
- Genética La genética.
Sus antecedentes:
- Las histonas son cruciales para el empaquetado del ADN y la regulación de la expresión génica.
- Comprender la función de las histonas es clave para descifrar los procesos celulares.
Objetivo del estudio:
- Para investigar los procesos celulares dependientes de la histona H2B.
- Determinar el impacto de la inhibición de la síntesis de histona H2B en la división celular, la replicación del ADN y la transcripción.
Principales métodos:
- El gen de la histona H2B se fusionó con un promotor reprimible de GAL10 en la levadura.
- La síntesis de ARNm histona H2B fue reprimida en células de crecimiento asincrónico.
- Se examina la segregación cromosómica, la replicación y la transcripción.
Principales resultados:
- Células detenidas en la mitosis, exhibiendo un fenotipo del ciclo de división celular (cdc).
- La estructura de la cromatina y la segregación nuclear se vieron significativamente alteradas.
- La replicación del ADN completó una ronda completa, y la transcripción activa persistió a pesar de la represión H2B.
Conclusiones:
- La histona H2B es esencial para la mitosis adecuada y la segregación cromosómica.
- Los procesos celulares como la replicación y la transcripción del ADN muestran una independencia parcial de la histona H2B recién sintetizada a corto plazo.
Videos de Conceptos Relacionados
01:23Negative Regulator Molecules
32.1K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
32.1K
01:57Meiosis II
169.4K
Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
169.4K
02:36DNA Damage can Stall the Cell Cycle
8.5K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
8.5K
02:02Meiosis II
32.7K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
32.7K
02:36DNA Damage Can Stall the Cell Cycle
2.4K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
2.4K
01:28The 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