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Replication in Eukaryotes

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

Bacterial RNA Polymerase

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

Bacterial RNA Polymerase

Bacterial RNA Polymerase

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

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Related Experiment Video

Updated: Jul 6, 2026

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Evolution of DNA polymerase iota structure and function in eukaryotes.

A V Makarova¹, V Z Tarantul, L V Gening

¹Institute of Molecular Genetics, Russian Academy of Sciences, Moscow, Russia. amakarova-img@yandex.ru

Biochemistry. Biokhimiia

|April 9, 2008

Summary

DNA polymerase iota (Pol iota) exhibits error-prone activity exclusively in mammals, absent in less complex organisms. This suggests structural changes in the active center may explain its evolution and function in higher eukaryotes.

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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method

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Published on: May 2, 2025

Area of Science:

Molecular Biology
Evolutionary Biology
Genetics

Background:

DNA polymerase iota (Pol iota) is a key enzyme in DNA replication and repair.
Its activity varies across eukaryotic species, with significant differences observed between mammals and other organisms.
Understanding these variations provides insights into evolutionary adaptations of DNA replication fidelity.

Purpose of the Study:

To investigate the presence and characteristics of DNA polymerase iota (Pol iota) enzymic activity in diverse eukaryotic classes.
To determine the evolutionary emergence of error-prone Pol iota activity.
To explore the potential functions of error-prone Pol iota in higher eukaryotes.

Main Methods:

Comparative analysis of DNA polymerase iota (Pol iota) enzymic activity across various eukaryotic taxa.
Biochemical assays to characterize the error-prone nature of Pol iota.
Structural analysis of the Pol iota active center (hypothetical).

Main Results:

Error-prone DNA polymerase iota (Pol iota) activity was detected exclusively in mammals.
This error-prone activity was found to be completely absent in organisms at lower evolutionary stages.
The study posits that structural alterations in the active center are responsible for the emergence of error-prone Pol iota in mammals.

Conclusions:

The evolution of error-prone DNA polymerase iota (Pol iota) activity is a mammalian-specific trait.
Structural modifications of the enzyme's active center are hypothesized as the cause for this specialization.
The specialized function of error-prone Pol iota in higher eukaryotes warrants further investigation.