Transcripción antisentido diferencial del locus del gen Dictyostelium EB4: implicaciones en la regulación mediada por antisentido de la estabilidad del ARNm
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Site-Directed Mutagenesis for In Vitro and In Vivo Experiments Exemplified with RNA Interactions in Escherichia Coli
Published on: February 5, 2019
1Max-Planck-Institut für Biochemie, Martinsried, Germany.
Cell
|April 3, 1992
Resumen
El ARN antisense regula la estabilidad del ARNm del gen prespore del Dictyostelium discoideum EB4-PSV. Su exceso de transcripción desestabiliza el ARNm, mientras que la inhibición de la síntesis de ARN impide esto, destacando un nuevo mecanismo de regulación génica.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- Regulación genética Reglamento genético.
- Biología Molecular Biología Molecular
Sus antecedentes:
- El gen Dictyostelium discoideum prespore EB4-PSV mRNA se transcribe constitutivamente pero se acumula durante la agregación.
- La agregación celular y la formación de patrones son cruciales para la expresión génica de las presporas.
- La interrupción mecánica de los patrones celulares conduce a una rápida pérdida de ARNm, lo que sugiere una regulación post-transcripcional.
Objetivo del estudio:
- Investigar el mecanismo que controla la estabilidad del ARNm EB4-PSV durante el desarrollo del Dictyostelium discoideum.
- Para identificar ARN reguladores involucrados en la estabilidad del ARNm.
- Para aclarar el papel de las transcripciones antisense en la regulación de la expresión génica.
Principales métodos:
- Análisis de la mancha del norte para detectar el ARNm y las transcripciones antisense.
- Análisis de las tasas de transcripción durante las diferentes etapas de desarrollo y después de la desagregación.
- Experimentos de inhibición de la síntesis de ARN.
Principales resultados:
- Se detecta una transcripción antisenso de 1,8 kb, originaria del mismo locus genético, cuando el ARNm EB4-PSV es inestable.
- La transcripción de ARN antisense está regulada por un promotor dentro de la región traducida del gen.
- El exceso de ARN antisentido se correlaciona con la inestabilidad del ARNm, e inhibir la síntesis de ARNm previene la desestabilización del ARNm después de la desagregación.
Conclusiones:
- El ARN antisense juega un papel crítico en la regulación de la estabilidad del ARNm EB4-PSV en Dictyostelium discoideum.
- Este mecanismo de regulación de la estabilidad del ARNm endógeno por transcripciones antisense es un hallazgo novedoso.
- Los hallazgos sugieren un mecanismo conservado para la regulación génica, similar a la pérdida de ARNm mediada por el constructo antisentido.
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