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Un homólogo de ciclina evolucionariamente conservado de Drosophila rescata la levadura deficiente en las ciclinas G1
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.
Cell
|September 20, 1991
Resumen
Los investigadores identificaron dos genes de Drosophila que pueden restaurar la función del ciclo celular en la levadura. Un gen es un homólogo del gen cdc2, y el otro es una nueva proteína ciclina C, que afecta el tamaño de las células de la levadura.
Área de la Ciencia:
- * Biología Molecular.
- * La genética.
- * Regulación del ciclo celular.
Sus antecedentes:
- * El ciclo celular es un proceso fundamental en las células eucariotas, regulado por ciclinas y cinasas dependientes de ciclinas (CDK).
- * Saccharomyces cerevisiae (levadura) sirve como un organismo modelo para estudiar el control del ciclo celular debido a sus vías genéticas conservadas.
- * Drosophila melanogaster (mosca de la fruta) comparte una homología genética significativa con la levadura, por lo que es una herramienta valiosa para estudios comparativos.
Objetivo del estudio:
- * Identificar y caracterizar los genes de Drosophila implicados en la regulación del ciclo celular.
- * Investigar la función de los nuevos miembros de la familia de la ciclina Drosophila.
- * Explorar las regiones evolutivamente conservadas dentro de las ciclinas y su potencial homología con otros oncogenes.
Principales métodos:
- * Aislamiento y caracterización de clones de ADNc de Drosophila.
- * Experimentos de rescate funcional en Saccharomyces cerevisiae con deficiencia en las funciones de CLN.
- * Análisis de homología de secuencias y comparación de regiones conservadas entre ciclinas.
Principales resultados:
- * Se aislaron dos clones de ADNc de Drosophila que rescataron levaduras deficientes en las funciones de CLN.
- * Un clon fue identificado como el homólogo de Drosophila del gen cdc2.
- * El segundo clon codificó una nueva proteína ciclina C, altamente homóloga a una contraparte humana, que indujo un tamaño inusualmente pequeño de las células de levadura cuando se sobreexpresó.
Conclusiones:
- * Drosophila posee homólogos de los reguladores clave del ciclo celular como cdc2.
- * Se identificó una nueva Drosophila cyclin C, conservada funcionalmente en la levadura e influyendo en el tamaño celular.
- * Las regiones conservadas en las ciclinas sugieren vínculos evolutivos y una potencial homología con el ras oncogene.
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