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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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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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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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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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El tiempo de replicación y la inestabilidad genética

Marcel Méchali1

  • 1Institute of Human Genetics, CNRS-University of Montpellier, Montpellier, France.

Science (New York, N.Y.)
|September 15, 2022
PubMed
Resumen
Este resumen es generado por máquina.

La activación sincronizada de los orígenes de la replicación del ADN causa inestabilidad genética en el linfoma. Este hallazgo pone de relieve un mecanismo clave que contribuye al desarrollo y la progresión del cáncer.

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Área de la Ciencia:

  • La genética
  • Biología molecular
  • Investigación del cáncer

Sus antecedentes:

  • La inestabilidad genética es una característica del cáncer, incluyendo el linfoma.
  • La desregulación de la replicación del ADN está implicada en el desarrollo de varios tipos de cáncer.

Objetivo del estudio:

  • Investigar el papel de la activación del origen de la replicación sincronizada del ADN en el linfoma.
  • Comprender el vínculo entre el tiempo de replicación y la inestabilidad genética en las células de linfoma.

Principales métodos:

  • Técnicas utilizadas para monitorear el origen de la replicación del ADN en las líneas celulares del linfoma.
  • Las alteraciones genómicas analizadas asociadas con eventos de replicación sincronizada.

Principales resultados:

  • Se demostró que la activación sincronizada de los orígenes de la replicación del ADN conduce a un aumento de las rupturas del ADN.
  • Se observó una correlación entre disparos de origen aberrante y tipos específicos de inestabilidad genética en el linfoma.

Conclusiones:

  • La activación sincronizada del origen de la replicación del ADN es un factor importante de inestabilidad genética en el linfoma.
  • El tiempo de replicación objetivo puede ofrecer nuevas estrategias terapéuticas para el tratamiento del linfoma.