Clases de cICLO CELULAR i
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Ciclo Celular
2012
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Proliferación
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Dos fases
Fase M o mitosis Intrefase
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Ciclo Celular
Proceso ordenado
Celulas Proliferantes
G0 estado no proliferativo
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Marcando con timidina tritiada es posible seguir la síntesis del DNA durante el ciclo celular
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MPF
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El ovulo fecundado tiene algo que induce a la
mitosis
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Se requiere del Núcleo
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Actividad MPF se asocia a ciclina
Figure 17-19. Rise and fall in levels of MPF and cyclin during the early embryonic cell cycle. The cyclin measurementshave been made chiefly in the eggs of marine invertebrates, where cyclin accounts for 5% of the protein synthesized during a brief pulse with radioactive amino acids. The gels below the graph show the amounts of labeled cyclin of two varieties, A and B, at different stages of the cycle of a clam egg. The bottom line in the gel shows the synthesis of a house-keeping enzyme that serves as a standard of comparison. (Adapted from T. Hunt, F.C. Luca, and J.V. Ruderman, J. Cell Biol. 116:707-724, 1992.)
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El modelo de regulacion del ciclo celular
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El motor del ciclo es la dupla ciclina – quinasa
dependiente de ciclina (cdk)
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El ciclo celular es regulado por complejos ciclina-quinasa
dependiente de ciclina
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Modelo levadura
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Mutante petite
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Diploide
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Mutantes de levadura
= cdc25= wee1
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Figure 17-30. The Cdc2 cycle in yeast. Cdc2 is permanently present, but its state of association with cyclins changes, definingthe division-cycle phase of the cell.
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Especificidad
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Vertebrados múltiples Cdk
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