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The Replisome

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...

The Replisome

The Replisome

DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with the...

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...

DNA as a Genetic Template

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

DNA as a Genetic Template

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...

Replication in Prokaryotes

Replication in Prokaryotes

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Related Experiment Video

Updated: Jun 5, 2026

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Published on: October 9, 2009

Self-replication: spelling it out in a chemical background.

Wentao Ma¹, Chunwu Yu, Wentao Zhang

¹College of Life Sciences, Wuhan University, Wuhan 430072, People's Republic of China. mwt@whu.edu.cn

Theory in Biosciences = Theorie in Den Biowissenschaften

|December 22, 2010

Summary

This study clarifies the chemical mechanisms of self-replication, a key feature of life. It defines self-replication as an entity favoring its own production, primarily through catalysis, offering new insights into life's origins.

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Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

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Electrophoretic Analysis of Replication Through Structure-Prone DNA Repeats Within the SV40-Based Human Episome

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Area of Science:

Biochemistry
Origin of Life Research
Chemical Biology

Background:

The concept of self-replication, crucial for defining life, lacks a precise chemical mechanism.
Vague definitions hinder research into the essence and origin of life, leading to debates.

Purpose of the Study:

To provide a clearer conceptual analysis of self-replication.
To establish a fundamental and unambiguous interpretation of self-replication in a chemical context.

Main Methods:

Conceptual analysis of self-replication.
Examination of chemical mechanisms underlying self-replication, focusing on catalysis.
Classification of catalytic functions relevant to self-replication.

Main Results:

Self-replication is defined as an entity favoring the production of its own kind.
Catalysis is identified as the primary chemical mechanism, categorized into speed- and direction-favoring types.
Molecular self-replication can be based on autocatalysis or self-metabolism, requiring self-division for complex entities.

Conclusions:

Clarified the definition and chemical basis of self-replication.
The proposed framework aids in understanding the fundamental aspects of life and its origins.
Provides a clearer foundation for future research in abiogenesis and synthetic life.