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El extensor de alcance media la actividad del potenciador de larga distancia.

Grace Bower1, Ethan W Hollingsworth1,2, Sandra H Jacinto1

  • 1Department of Developmental and Cell Biology, University of California Irvine, Irvine, CA, USA.

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Resumen
Este resumen es generado por máquina.

Los científicos descubrieron un nuevo elemento de ADN, el extensor de rango (REX), que permite a los potenciadores controlar los genes a través de distancias de megabases. Este hallazgo aclara cómo ocurre la regulación génica de largo alcance en los mamíferos, crucial para el desarrollo.

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Área de la Ciencia:

  • Biología del desarrollo
  • La genética
  • Biología molecular

Sus antecedentes:

  • Los potenciadores transcripcionales de mamíferos suelen regular los promotores de genes en decenas de kilobases.
  • Algunos potenciadores, sin embargo, funcionan a distancias de megabases, pero las características de la secuencia subyacente son desconocidas.

Objetivo del estudio:

  • Identificar las características de la secuencia que permiten las interacciones potenciador-promotor a larga distancia.
  • Investigar el mecanismo de la regulación génica de largo alcance en el desarrollo de los mamíferos.

Principales métodos:

  • Experimentos de reemplazo del potenciador in vivo en el locus Shh del ratón.
  • Identificación y caracterización del elemento extensor de rango (REX).
  • Análisis de mutación de los motivos conservados dentro del elemento REX y el potenciador ZRS.
  • Generación de ratones simulados para evaluar el desarrollo de las extremidades.

Principales resultados:

  • Los potenciadores de extremidades de corto y mediano alcance no pueden activar la expresión génica a largas distancias.
  • Un nuevo elemento de acción cis, REX, confiere actividad reguladora a larga distancia.
  • La adición de REX a otros potenciadores aumentó su rango de interacción hasta en un orden de magnitud.
  • Los motivos de homeodomain [C/T]AATTA conservados dentro de REX son críticos para su actividad y están enriquecidos con potenciadores de extremidades de largo alcance.
  • La mutación de estos motivos en el potenciador ZRS abolió la actividad de largo alcance, causando una reducción severa de las extremidades.

Conclusiones:

  • El elemento REX es necesario y suficiente para conferir activación a larga distancia mediante potenciadores remotos.
  • Una firma de secuencia específica, incluidos los motivos [C/T]AATTA, se asocia con las interacciones potenciador-promotor de largo alcance.
  • Este descubrimiento proporciona información crítica sobre los mecanismos de regulación génica de largo alcance durante el desarrollo de los mamíferos.