Video Experimental Relacionado
Updated: Jan 17, 2026
01:32
Assembly of Complex Microtubule Structures
2.4K
Una iniciación traslacional no-AUG en el exón c-myc 1 genera una proteína N-terminalmente distinta cuya síntesis se
S R Hann1, M W King, D L Bentley
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104.
Cell
|January 29, 1988
Resumen
Dos proteínas c-myc distintas se originan en sitios de inicio de traducción alternativos dentro del gen c-myc. Las mutaciones que afectan al exón 1 en los linfomas de Burkitt pueden influir en la oncogénesis al alterar la síntesis de proteínas.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Oncología Oncología.
Sus antecedentes:
- El gen c-myc codifica proteínas cruciales para el crecimiento y la diferenciación celular.
- Las observaciones anteriores indicaron la existencia de dos proteínas c-myc relacionadas, cuyo origen no está claro.
Objetivo del estudio:
- Para dilucidar los mecanismos moleculares que generan las dos proteínas c-myc distintas.
- Investigar el papel de la iniciación alternativa de la traducción en la producción de proteínas c-myc.
Principales métodos:
- Mapeo de las proteínas c-myc utilizando técnicas avanzadas.
- Análisis de la capacidad de codificación de proteínas in vitro de los ADN complementarios c-myc (ADNc).
Principales resultados:
- Se identificaron dos sitios alternativos de iniciación de la traducción: un codón AUG en el exón 2 y un codón no AUG en el exón 1.
- Se demostró que estos sitios producen proteínas c-myc con diferentes N-terminales.
- Se observó que las alteraciones del exón 1 en los linfomas de Burkitt se correlacionan con la reducción de la síntesis de la mayor proteína c-myc.
Conclusiones:
- Las dos proteínas c-myc surgen de eventos alternativos de iniciación traslacional.
- El papel del exón 1 en la regulación de la síntesis de proteínas c-myc es significativo, impactando potencialmente la oncogénesis en cánceres específicos como el linfoma de Burkitt.
Videos de Conceptos Relacionados
Assembly of Complex Microtubule Structures
2.4K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
2.4K
Spindle Assembly
4.2K
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
4.2K
Centrioles and Centrosomes
5.4K
Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
Near the end of the prophase, also called late prophase or...
5.4K
Microtubule Formation
7.4K
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
7.4K
Microtubules in Cell Motility
4.5K
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...
4.5K
Microtubule Associated Motor Proteins
10.3K
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
10.3K