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El silenciamiento meiótico por el ADN no apareado
P K Shiu1, N B Raju, D Zickler
1Department of Biological Sciences, 385 Serra Mall, Stanford University, Stanford, CA 94305, USA. ktshiu@stanford.edu
Cell
|January 10, 2002
Resumen
El silenciamiento meiótico por ADN no apareado (MSUD) es un proceso recientemente descrito en el que el ADN no apareado durante la meiosis silencia el ADN homólogo. Un mutante de Neurospora, Sad-1, no puede realizar MSUD, ofreciendo información sobre la función del gen meiotic.
Área de la Ciencia:
- Genética La genética.
- Biología Molecular Biología Molecular
- La micología de la micología.
Sus antecedentes:
- Los mecanismos de silenciamiento de genes como la cosupresión (plantas) y la supresión (hongos) ocurren cuando los segmentos de ADN están en exceso.
- La meiosis es un proceso crítico de división celular para la reproducción sexual.
Objetivo del estudio:
- Para describir un nuevo proceso de silenciamiento de genes durante la meiosis, denominado silenciamiento meiotico por ADN no apareado (MSUD).
- Para investigar la base genética de MSUD utilizando un mutante de Neurospora, Sad-1.
- Explorar las implicaciones de MSUD para la comprensión de la función génica meiotica y el aislamiento reproductivo.
Principales métodos:
- Caracterización del silenciamiento meiotico por el fenómeno del ADN no apareado (MSUD).
- Análisis genético del mutante de Neurospora semidominante Sad-1, que afecta al MSUD.
- Análisis fenotípico de Sad-1 en relación con otros mutantes meioticos.
Principales resultados:
- MSUD silencia todo el ADN homólogo al ADN no emparejado durante la meiosis, incluidos los genes emparejados.
- El mutante Sad-1 es defectuoso en el MSUD y suprime los fenotipos sexuales de los mutantes dominantes del asco.
- El alelo de tipo salvaje, sad-1(+), codifica una presunta ARN dirigida por ARN polimerasa.
Conclusiones:
- MSUD es un mecanismo distinto de silenciamiento de genes que opera durante la meiosis.
- El gen Sad-1 es crucial para MSUD y probablemente juega un papel en la regulación de los procesos meióticos.
- MSUD puede ofrecer información sobre los genes meióticos esenciales y contribuir al aislamiento reproductivo en Neurospora.
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