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Se requiere un locus genético complejo, poliomeótico, para la especificación segmentaria y el desarrollo epidérmico
J M Dura1, N B Randsholt, J Deatrick
1Centre de Génétique Moleculaire, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France.
Cell
|December 4, 1987
Resumen
El gen poliomeótico (ph) requiere dos mutaciones para el efecto nulo, lo que indica complejidad. El análisis del ADN reveló secuencias duplicadas críticas para la función del gen ph, lo que sugiere un nuevo mecanismo genético.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Genética La genética.
- Biología molecular La biología molecular.
Sus antecedentes:
- El gen poliomeótico (ph) es crucial para el desarrollo embrionario.
- Las mutaciones nulas en el ph conducen a la letalidad embrionaria y a la pérdida de derivados epidérmicos específicos.
- Las mutaciones de un solo evento exhiben fenotipos dominantes de ganancia de función, similares a los genes de desarrollo conocidos.
Objetivo del estudio:
- Para investigar la complejidad genética del locus poliomeótico (ph).
- Para entender la base molecular de la función del gen ph y sus requisitos de mutación inusuales.
- Proponer un modelo para la organización funcional del ph locus.
Principales métodos:
- La clonación posicional a través de la caminata cromosómica para localizar el gen ph.
- Análisis de las mutaciones de ph resultantes de los reordenamientos del ADN.
- Estudios de hibridación para identificar elementos repetitivos del ADN en la región ph.
Principales resultados:
- El gen ph fue localizado utilizando deficiencias y mutaciones inducidas por reordenamiento.
- Se identificaron dos grandes secuencias de ADN duplicadas dentro del locus ph.
- Las lesiones en cualquiera de las secuencias duplicadas interrumpen la función del gen ph, lo que confirma su importancia.
Conclusiones:
- El locus poliomeótico (ph) es genéticamente complejo, requiriendo dos eventos mutagénicos para un fenotipo nulo.
- La presencia de secuencias duplicadas es esencial para la función normal del gen ph.
- Se propone un modelo para explicar la inusual organización funcional y los requisitos genéticos del ph locus.
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