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The DNA Replication Fork

The DNA Replication Fork

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 forks, one in...

The DNA Replication Fork

The DNA Replication Fork

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 forks, one in...

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...

Proofreading

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme

Proofreading

Proofreading

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Related Experiment Video

Updated: May 23, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

Published on: July 26, 2018

Optimal control of gene mutation in DNA replication.

Juanyi Yu¹, Jr-Shin Li, Tzyh-Jong Tarn

¹Department of Electrical and Systems Engineering, Washington University in St. Louis, Green Hall, Campus Box 1042, One Brookings Drive, St. Louis, MO 63130, USA. juanyi.yu@wustl.edu

Journal of Biomedicine & Biotechnology

|March 29, 2012

Summary

We present a novel control system framework for understanding gene mutations during DNA replication. This approach allows for optimal control of mutations, achieving desired outcomes within a finite number of steps.

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Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis

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Area of Science:

Molecular Biology
Systems Biology
Control Theory

Background:

Gene mutations are crucial in DNA replication and disease.
Current models often lack a precise, molecular-level control perspective.
Understanding mutation dynamics is key to developing targeted therapies.

Purpose of the Study:

To propose a molecular-level control system framework for gene mutations in DNA replication.
To model DNA sequences, mutagens, and cell cycles using systems theory.
To solve optimal control problems for deterministic and stochastic mutation processes.

Main Methods:

Modeling DNA sequences as state variables and mutagens as control inputs.
Deriving deterministic and stochastic discrete-time, finite-state system equations.
Applying dynamic programming to solve optimal control problems with defined cost functions.

Main Results:

Developed system equations for DNA replication mutation dynamics.
Solved optimal control problems for both deterministic and stochastic mutation processes.
Demonstrated that global optimums for mutations are achievable in finite steps.

Conclusions:

A finite-field control system view provides a powerful framework for analyzing gene mutations.
Optimal control strategies can be devised to manage DNA replication mutation.
This approach offers new avenues for research in genetic stability and disease intervention.