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Updated: Jun 28, 2025

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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El daño del ADN acelera el plegamiento G-cuadruplex en un contexto duplex-G-cuadruplex-duplex

Aaron M Fleming1, Brandon Leonel Guerra Castañaza Jenkins1, Bethany A Buck1

  • 1Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States.

Journal of the American Chemical Society
|April 11, 2024
PubMed
Resumen

El daño al ADN afecta significativamente el plegamiento de las potenciales secuencias G-cuadruplexas (PQS), afectando la regulación génica. Las rupturas de ADN aceleran el plegamiento de PQS, con implicaciones para procesos celulares como la replicación y la reparación.

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • La bioquímica

Sus antecedentes:

  • Las secuencias potenciales G-cuadruplex (PQS) forman estructuras de ADN no canónicas cruciales para la regulación génica.
  • La influencia del daño del ADN en la cinética de plegamiento del PQS sigue siendo poco conocida.
  • Las restricciones genómicas del ADN en el plegamiento de PQS son imitadas por andamios dúplex-G-cuadruplex-dúplex (DGD).

Objetivo del estudio:

  • Para investigar los efectos de los daños en las bases de ADN y las rupturas de las hebras en la cinética de plegado de PQS.
  • Para analizar el plegamiento de PQS dentro de un andamio DGD utilizando la secuencia promotora de VEGF.
  • Determinar el impacto del daño en el plegamiento del PQS relevante para las escalas de tiempo celulares.

Principales métodos:

  • Espectroscopia de dicroísmo circular (CD) para monitorear la cinética del plegado.
  • Resonancia magnética nuclear de protones 1D (1H NMR) para el análisis estructural.
  • Utilizando un andamio dúplex-G-cuadruplex-dúplex (DGD) para la secuencia promotora del VEGF.

Principales resultados:

  • Los tiempos de semidesintegración variaron de 2 segundos a 12 minutos según el tipo y la ubicación del daño en el ADN.
  • Una ruptura de una sola hebra cerca de las carreras G aceleró el plegamiento >150 veces.
  • Los iones Mg2+ y la proteína APE1 facilitaron el plegamiento del PQS.
  • CD y RMN confirmaron la formación de G4 y el plegamiento dependiente del daño.

Conclusiones:

  • Los daños en el ADN, particularmente las rupturas de hebras, alteran significativamente la cinética de plegamiento de PQS.
  • El pliegue PQS promotor del VEGF es sensible al tipo y la posición del daño en el ADN.
  • Las vidas medias de plegado son relevantes para los procesos de replicación, transcripción y reparación del ADN.