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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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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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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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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Transferencia de histona parental capturada en el tenedor de replicación

Ningning Li1, Yuan Gao2, Yujie Zhang3

  • 1State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, School of Life Sciences, Peking University, Beijing, China.

Nature
|March 6, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores visualizan cómo el complejo FACT y las histonas expulsadas interactúan con los replicosomas de la levadura. Esto revela conocimientos estructurales sobre el reciclaje de histonas acopladas a la replicación, crucial para mantener la herencia epigenética durante la replicación del ADN.

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Área de la Ciencia:

  • Biología molecular
  • La epigenética
  • Biología estructural

Sus antecedentes:

  • El ADN eucariótico se compacta en cromatina a través de los nucleosomas.
  • La replicación del genoma requiere una transmisión coordinada del epigenoma.
  • Comprender la dinámica de las histonas durante la replicación es clave para la herencia epigenética.

Objetivo del estudio:

  • Determinar el mecanismo estructural de la gestión de histonas por el complejo FACT durante la replicación del ADN.
  • Para aclarar cómo las histonas desalojadas son procesadas y recicladas por el replicoma.

Principales métodos:

  • Microscopía cryoelectrónica (cryo-EM) de los replicomas de la levadura.
  • Análisis estructural de las interacciones del complejo FACT (Spt16, Pob3) con las histonas expulsadas.
  • Visualización de las interacciones del dominio de unión de la histona Mcm2.

Principales resultados:

  • El complejo FACT captura las histonas desalojadas en el frente del replicoma.
  • Mcm2 se une al tetramero H3-H4, ocupando un sitio vacante H2A-H2B.
  • Las histonas se reposicionan para transferirse al ADN recién sintetizado, facilitando el reciclaje de histonas.

Conclusiones:

  • Proporciona información estructural crucial sobre el reciclaje de histonas acopladas a la replicación.
  • Demuestra un mecanismo para mantener la información epigenética durante la replicación del ADN.
  • Destaca el papel de FACT y Mcm2 en el manejo de histonas durante la replicación.