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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...

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...

Binary Fission

Binary Fission

Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.

Binary Fission

Binary Fission

Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...

Replication in Prokaryotes

Replication in Prokaryotes

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...

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Updated: May 7, 2026

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Published on: October 9, 2009

Statistical physics of self-replication.

Jeremy L England¹

¹Department of Physics, Massachusetts Institute of Technology, Building 6C, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

The Journal of Chemical Physics

|October 5, 2013

Summary

This summary is machine-generated.

All living things self-replicate, a process requiring energy production and entropy. This study quantifies the minimum heat produced during self-replication, linking it to growth rate and replicator durability.

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Last Updated: May 7, 2026

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

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Published on: October 9, 2009

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Area of Science:

Thermodynamics
Biophysics
Origin of Life Research

Background:

Self-replication is fundamental to all life.
Physical intuition suggests self-replication generates entropy.
A quantitative understanding of this process is lacking.

Purpose of the Study:

To rigorously derive a lower bound for heat production during self-replication.
To establish a quantitative link between replication parameters and energy dissipation.
To explore implications for biological and pre-biotic systems.

Main Methods:

Theoretical derivation of a lower bound for heat production.
Analysis of a self-replicating system coupled to a thermal bath.
Mathematical modeling of entropy production.

Main Results:

A minimum physically allowed rate of heat production was derived.
Heat production is determined by growth rate, internal entropy, and replicator durability.
The findings provide a quantitative constraint on self-replication.

Conclusions:

The study provides a rigorous thermodynamic framework for self-replication.
Implications are discussed for bacterial cell division and the emergence of early life.
This work bridges thermodynamics and the study of life's fundamental processes.