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Related Concept Videos

Genome Copying Errors02:46

Genome Copying Errors

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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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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement

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Replication timing and genetic instability.

Marcel Méchali1

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

Science (New York, N.Y.)
|September 15, 2022
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Summary
This summary is machine-generated.

Synchronized activation of DNA replication origins causes genetic instability in lymphoma. This finding highlights a key mechanism contributing to cancer development and progression.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Genetic instability is a hallmark of cancer, including lymphoma.
  • Dysregulation of DNA replication is implicated in the development of various cancers.

Purpose of the Study:

  • To investigate the role of synchronized DNA replication origin activation in lymphoma.
  • To understand the link between replication timing and genetic instability in lymphoma cells.

Main Methods:

  • Utilized techniques to monitor DNA replication origin firing in lymphoma cell lines.
  • Analyzed genomic alterations associated with synchronized replication events.

Main Results:

  • Demonstrated that synchronized activation of DNA replication origins leads to increased DNA breaks.
  • Observed a correlation between aberrant origin firing and specific types of genetic instability in lymphoma.

Conclusions:

  • Synchronized DNA replication origin activation is a significant driver of genetic instability in lymphoma.
  • Targeting replication timing may offer novel therapeutic strategies for lymphoma treatment.