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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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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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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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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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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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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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Updated: Jun 14, 2025

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El aprendizaje profundo se encuentra con las histonas en la bifurcación de la replicación

Hiten D Madhani1

  • 1Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.

Cell
|September 6, 2024
PubMed
Resumen
Este resumen es generado por máquina.

La transferencia de histonas parentales durante la replicación del ADN es crucial para la herencia epigenética. Un componente del replicoma, Mrc1/CLASPIN, actúa como un chaperón de histona, facilitando esta transferencia esencial de histona parental a las cadenas de ADN hijas.

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Área de la Ciencia:

  • Biología molecular
  • La epigenética
  • Biología de la cromatina

Sus antecedentes:

  • La herencia epigenética se basa en el paso de los estados de cromatina a través de las divisiones celulares.
  • Las proteínas histónicas parentales (tetrámeros H3-H4) deben distribuirse a las dos nuevas hebras de ADN durante la replicación.
  • Los mecanismos precisos que aseguran una distribución equitativa de las histonas siguen siendo incompletamente entendidos.

Objetivo del estudio:

  • Identificar los factores que median la transferencia de los tetrámeros H3-H4 de los padres a los dúplex de ADN de las hijas.
  • Aclarar el papel de los componentes de la maquinaria de replicación en la herencia epigenética.

Principales métodos:

  • Utilizó la genética de la levadura y ensayos de herencia para estudiar la segregación de histonas.
  • Empleado AlphaFold2-multimer predicciones para conocimientos estructurales.
  • Enfoques bioquímicos integrados para validar las funciones de las proteínas.

Principales resultados:

  • Identificó a Mrc1 (también conocido como CLASPIN) como un componente crítico del replicoma de ADN.
  • Se ha demostrado que Mrc1 funciona como acompañante de los tetrámeros H3-H4.
  • Mostró el papel esencial de Mrc1 en la transferencia de tetrámeros H3-H4 parentales a ambas hebras de ADN hija durante la replicación.

Conclusiones:

  • Mrc1/ CLASPIN es una histona chaperona clave involucrada en la herencia epigenética.
  • La maquinaria de replicación del ADN participa directamente en garantizar la transmisión fiel de la información epigenética.
  • Este hallazgo proporciona un vínculo mecánico entre la replicación del ADN y el mantenimiento de los estados de la cromatina.