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La evolución convergente de un ciclo sexual fusionado promueve el estilo de vida haploide
Racquel Kim Sherwood1, Christine M Scaduto1, Sandra E Torres1
1Department of Microbiology and Immunology, Brown University, 171 Meeting St, Providence, RI, 02912.
Nature
|January 7, 2014
Resumen
Candida lusitaniae exhibe un ciclo sexual integrado donde el apareamiento y la meiosis están co-regulados, a diferencia de Saccharomyces cerevisiae. Este programa sexual conservado sugiere que el acoplamiento regulador evolucionó varias veces en la levadura.
Área de la Ciencia:
- Microbiología Microbiología.
- Genética La genética.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- La reproducción sexual en los eucariotas implica la fusión de gametos y la meiosis.
- Saccharomyces cerevisiae muestra una regulación separada del apareamiento y la meiosis.
- Comprender los mecanismos de reproducción sexual de las levaduras proporciona información sobre la evolución de los eucariotas.
Objetivo del estudio:
- Para investigar el mecanismo de la reproducción sexual en Candida lusitaniae.
- Para comparar el control regulatorio del apareamiento y la meiosis en C. lusitaniae versus S. cerevisiae.
- Para explorar el recableado evolutivo de la reproducción sexual en levaduras hemiascomicetas.
Principales métodos:
- Perfiles de expresión génica durante el ciclo sexual de C. lusitaniae.
- Análisis genético de los genes reguladores clave (ortólogos IME2, STE12).
- Análisis comparativo con el Saccharomyces cerevisiae y el Schizosaccharomyces pombe.
Principales resultados:
- C. lusitaniae exhibe un programa sexual fusionado e integrado, a diferencia de los controles separados de S. cerevisiae.
- Los patrones de expresión génica para el apareamiento y la meiosis se superponen, lo que indica la corregulación.
- Los genes clave (ortólogos IME2, STE12) son esenciales tanto para el apareamiento como para la meiosis en C. lusitaniae.
Conclusiones:
- Las vías reguladoras de la reproducción sexual se han vuelto a conectar significativamente entre S. cerevisiae y C. lusitaniae.
- C. lusitaniae emplea un ciclo sexual concertado, más similar a las levaduras lejanamente relacionadas.
- El acoplamiento regulador del apareamiento y la meiosis probablemente evolucionó varias veces como una adaptación al estilo de vida haploide.
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