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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Replication Protein A1 es esencial para la reparación del daño del ADN durante la oogénesis de mamíferos†

Xiaosu Miao1, Rui Guo2,3, Andrea Williams1

  • 1Department of Veterinary and Animal Sciences, University of Massachusetts, Amherst, MA, USA.

Biology of reproduction
|February 27, 2026
PubMed
Resumen

La proteína A de replicación (RPA) es crucial para la reparación del ADN en ovocitos en desarrollo. Su ausencia causa daño del ADN, problemas cromosómicos e infertilidad en mamíferos hembras.

Palabras clave:
daño del ADNalineación de cromosomasfertilidad femeninafoliculogénesiseliminación condicional específica de ovocitos

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Área de la Ciencia:

  • Biología reproductiva
  • Genética molecular
  • Biología celular

Sus antecedentes:

  • El daño no reparado del ADN en los ovocitos puede provocar anomalías genéticas, abortos espontáneos e infertilidad.
  • La proteína A de replicación (RPA) es un complejo vital de unión al ADN de cadena simple involucrado en procesos del ADN.

Objetivo del estudio:

  • Investigar el papel novedoso de RPA en la reparación del daño del ADN durante el desarrollo posnatal de los ovocitos.
  • Comprender las consecuencias de la deficiencia de RPA en los ovocitos.

Principales métodos:

  • Inactivación de RPA1 (proteína A de replicación 1) en ovocitos utilizando controladores Cre específicos de la línea germinal (Ddx4-Cre y Zp3-Cre).
  • Se evaluó el desensamblaje del complejo RPA, el daño del ADN, la activación de la respuesta al daño del ADN, la alineación de los cromosomas y la foliculogénesis.
  • Se analizaron los niveles de transcripción de genes involucrados en la organización del citoesqueleto.

Principales resultados:

  • La depleción de RPA1 condujo al desensamblaje del complejo RPA y a un daño severo del ADN en ovocitos en etapa GV.
  • La deficiencia de RPA activó vías canónicas de respuesta al daño del ADN (ATM, ATR, DNA-PK, p53).
  • Se observó desalineación cromosómica y alteración de la foliculogénesis, lo que resultó en una reducción del número de ovocitos e infertilidad femenina.

Conclusiones:

  • RPA juega un papel crítico, previamente no reconocido, en la reparación del daño del ADN durante la oogénesis de mamíferos.
  • RPA es esencial para mantener la integridad genética del ovocito y la fertilidad femenina.