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Caracterización molecular de Ph1 como un importante locus de apareamiento cromosómico en el trigo poliploide
Simon Griffiths1, Rebecca Sharp, Tracie N Foote
1John Innes Centre, Colney, Norwich NR4 7UH, UK.
Nature
|February 10, 2006
Resumen
El locus Ph1, crucial para la fertilidad del trigo, ha sido localizado en una región específica del cromosoma 5B. Esta región contiene una estructura única que involucra a los genes heterocromatina y cdc2, probablemente responsables de su control de emparejamiento meiotico.
Área de la Ciencia:
- Genética La genética.
- Biología Vegetal Biología Vegetal
- Biología Molecular Biología Molecular
Sus antecedentes:
- La alta fertilidad del trigo de pan se basa en un genoma poliploide estable.
- Las especies de trigo (hexaploides y tetraploides) exhiben un comportamiento diploide durante la meiosis, controlado por el locus Ph1.
- El locus Ph1 evita el emparejamiento entre cromosomas relacionados en híbridos de trigo.
Objetivo del estudio:
- Para localizar el locus Ph1.
- Comprender la base estructural de la actividad Ph1 y su papel en la meiosis del trigo.
Principales métodos:
- Mapeo genético para identificar el locus Ph1.
- Análisis de la estructura del cromosoma 5B del trigo.
- Genómica comparativa en especies de trigo relacionadas.
Principales resultados:
- El locus Ph1 se localizó en una región intersticial de 2.5 megabases en el cromosoma 5B del trigo.
- Esta región contiene una estructura con heterocromatina subtelomérica insertada en genes relacionados con cdc2.
- La presencia de esta estructura se correlaciona con la actividad Ph1 en especies relacionadas.
Conclusiones:
- La estructura identificada es un fuerte candidato para el locus Ph1.
- Esta estructura probablemente surgió durante la poliploidización y es esencial para la estabilidad meiotica en el trigo.
- Comprender la estructura de Ph1 proporciona información sobre la evolución del genoma del trigo y la fertilidad.
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