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Evolución concertada de genes de ARNt: conversión intergénica entre tres genes de ARNt serina no vinculados en S.
Cell
|April 1, 1985
Resumen
La conversión intergénica, un proceso de conversión de genes, mantiene la identidad de secuencia entre los genes de ARN de transferencia disperso (ARNt) en la levadura de fisión Schizosaccharomyces pombe. Este mecanismo facilita la transferencia de segmentos de ADN entre los cromosomas, asegurando la cohesión de la familia de genes.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- Múltiples genes para un solo ARN de transferencia (ARNt) a menudo se extienden por todo el genoma.
- Estas familias de genes mantienen una similitud de secuencia a lo largo del tiempo evolutivo.
- La conversión intergenética es un mecanismo clave para esta evolución concertada.
Objetivo del estudio:
- Para investigar la conversión intergénica entre genes de ARNt relacionados en Schizosaccharomyces pombe.
- Para determinar las características y la frecuencia de la transferencia de secuencias entre genes de ARNt disperso.
Principales métodos:
- Análisis de secuencia de genes de ARNt convertidos.
- El análisis meiótico en Schizosaccharomyces pombe.
Principales resultados:
- Se observó una conversión intergénica entre tres genes de ARNt relacionados en diferentes cromosomas.
- Los segmentos de ADN transferidos oscilaron entre 18-33 bp y 190 bp.
- La frecuencia de estas transferencias durante la meiosis fue de aproximadamente 10^-5 por esporas de la progenie.
- La transferencia de información se produjo de forma bidireccional entre los miembros de la familia de genes.
Conclusiones:
- La conversión intergénica homogeneiza efectivamente las secuencias entre los genes de ARNt disperso en Schizosaccharomyces pombe.
- Este proceso juega un papel crucial en el mantenimiento de la integridad de las familias de genes de tRNA.
- El estudio proporciona datos cuantitativos sobre la frecuencia y la escala de la transferencia de ADN durante la meiosis.
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