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Replication in Eukaryotes01:29

Replication in Eukaryotes

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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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Eukaryotic replication follows many of the same...
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Overview of DNA Repair02:25

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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Related Experiment Video

Updated: Jun 25, 2025

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

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Recent Advances in Genome Maintenance Processes.

Ingrid Tessmer1

  • 1Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg, 97080 Würzburg, Germany.

International Journal of Molecular Sciences
|May 25, 2024
PubMed
Summary
This summary is machine-generated.

Genome maintenance is crucial for life. Research focuses on molecular mechanisms for genome protection and repair of genetic material damage.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Life depends on maintaining the integrity of the genome.
  • Understanding genome maintenance is a key research area.
  • Molecular processes for genome protection and repair are under investigation.

Discussion:

  • The study investigates the molecular mechanisms underlying genome maintenance.
  • It highlights the importance of protecting genetic material from damage.
  • The research addresses the repair of introduced alterations in DNA.

Key Insights:

  • Genome maintenance is fundamental to all living organisms.
  • Molecular processes are key to protecting and repairing genetic material.
  • Research in this area is vital for understanding life itself.

Outlook:

  • Future research will likely focus on the detailed molecular pathways involved.
  • Potential applications in medicine and biotechnology may emerge.
  • Continued investigation is needed to fully elucidate these complex processes.