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DNA Replication

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication uses a large number of...

Replication in Prokaryotes

Replication in Prokaryotes

DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
Many Proteins Work Together to Replicate the Chromosome
Replication is coordinated and carried out by a host of specialized...

Replication in Prokaryotes

Replication in Prokaryotes

Replication in Prokaryotes

Replication in Prokaryotes

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...

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Related Experiment Video

Updated: May 18, 2026

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

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

Published on: January 19, 2017

Mathematical modeling of genome replication.

Renata Retkute¹, Conrad A Nieduszynski, Alessandro de Moura

¹Centre for Genetics and Genomics, University of Nottingham, Nottingham NG7 2UH, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|October 4, 2012

Summary

This summary is machine-generated.

This study presents a mathematical model for DNA replication dynamics in eukaryotic cells. The model reveals how cell-to-cell variability in replication can be detected from population-averaged data.

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Area of Science:

Molecular Biology
Biophysics
Computational Biology

Background:

Eukaryotic DNA replication initiates at multiple chromosomal sites.
Global and local regulation of DNA replication remains poorly understood.
Population-averaged biological experiments can obscure cell-specific variations.

Purpose of the Study:

To develop a mathematical model for the spatial dynamics of DNA replication.
To gain insights into replication kinetics across diverse organisms.
To investigate how cell-to-cell variability in replication can be identified from averaged data.

Main Methods:

Formulation of a mathematical model for DNA replication dynamics.
Analysis of spatial and temporal aspects of replication kinetics.
Mathematical analysis to derive signatures of stochasticity from population averages.

Main Results:

The model provides insights into DNA replication kinetics in different organisms.
Demonstrates that cell-to-cell variability can be inferred from population-level data.
Generalizes previous findings to a wider range of parameter regimes.

Conclusions:

The developed mathematical model offers a novel approach to studying DNA replication.
Averaged quantities can indeed reflect underlying stochasticity in individual cell replication.
This work advances the understanding of replication regulation and variability.