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DNA Damage can Stall the Cell Cycle

DNA Damage can Stall the Cell Cycle

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...

DNA Damage Can Stall the Cell Cycle

DNA Damage Can Stall the Cell Cycle

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...

Restarting Stalled Replication Forks

Restarting Stalled Replication Forks

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, a...

Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

Mismatch Repair

Mismatch Repair

Mismatch Repair

Mismatch Repair

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Related Experiment Video

Updated: Jul 5, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

Expanded roles for Chk1 in genome maintenance.

Greg H Enders¹

¹Department of Medicine, Fox Chase Cancer Center, Philadelphia, PA 19111, USA. Greg.Enders@fccc.edu

The Journal of Biological Chemistry

|April 22, 2008

Summary

Checkpoint kinase 1 (Chk1) delays cell cycles when DNA replication is blocked. New findings reveal Chk1

Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Checkpoint kinase 1 (Chk1) is a key regulator of the DNA damage response.
Chk1 activity is crucial for maintaining genomic stability during cell division.

Purpose of the Study:

To elucidate the multifaceted roles of Chk1 in DNA replication and genomic integrity.
To explore the implications of Chk1 function in early embryonic development and cancer therapy.

Main Methods:

Review of recent experimental findings on Chk1.
Analysis of Chk1's effects on DNA replication origins and fork progression.
Examination of Chk1's involvement in Fanconi anemia pathway, mitotic spindle, and gene transcription.

Main Results:

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Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System

Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System

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Last Updated: Jul 5, 2026

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

Examination of Proteins Bound to Nascent DNA in Mammalian Cells Using BrdU-ChIP-Slot-Western Technique

Examination of Proteins Bound to Nascent DNA in Mammalian Cells Using BrdU-ChIP-Slot-Western Technique

Published on: January 14, 2016

Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System

Genetic Studies of Human DNA Repair Proteins Using Yeast as a Model System

Published on: March 18, 2010

Chk1 influences mammalian DNA replication origins and replication fork progression.
Chk1 contributes to genomic integrity by affecting Fanconi anemia proteins, the mitotic spindle, and cell cycle gene transcription.
Chk1 is essential for proliferating cells in early embryos.

Conclusions:

Chk1 plays diverse roles beyond cell cycle delay, impacting DNA replication and genomic stability.
Understanding Chk1's functions provides insights into early development and potential cancer therapeutic strategies involving Chk1 inhibition.