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Genome Annotation and Assembly

Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.

Proofreading

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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...

Proofreading

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Related Experiment Video

Updated: Apr 17, 2026

Use of In Vivo Assembly for High-efficiency Plasmid Construction

Use of In Vivo Assembly for High-efficiency Plasmid Construction

Published on: February 7, 2025

Positive selection improves the efficiency of DNA assembly.

Chang-Ho Baek¹, Jonathan Chesnut¹, Federico Katzen¹

¹Thermo Fisher Scientific, Carlsbad, CA 92008, USA.

Analytical Biochemistry

|February 10, 2015

Summary

This summary is machine-generated.

This study introduces a new DNA cloning strategy using positive selection of truncated plasmid markers to reduce errors in synthetic biology. The method improves the accuracy of assembling large DNA constructs, simplifying clone screening.

Keywords:

Cloning DNA assembly Positive selection Synthetic biology

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Last Updated: Apr 17, 2026

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Area of Science:

Synthetic biology
Molecular biology
Biotechnology

Background:

Increasing demand for large synthetic DNA fragments in synthetic biology and cell engineering.
Existing multi-fragment cloning technologies face challenges with screening due to illegitimate assembly.
High incidence of missing or shuffled DNA elements complicates clone selection.

Purpose of the Study:

To develop a strategy that reduces fragment mis-assembly rates in DNA construct assembly.
To create a method compatible with various cloning methodologies, including homologous recombination and restriction endonuclease-based approaches.
To mitigate the tediousness of screening for correct clones by improving assembly accuracy.

Main Methods:

Utilized a positive selection strategy based on truncated plasmid markers.
Designed the system so that missing marker sequences are supplied during the DNA assembly process, activating the marker.
Validated the approach within complex in vivo and in vitro homologous recombination workflows.

Main Results:

Successfully reduced the rate of fragment mis-assembly during complex DNA construct generation.
Demonstrated compatibility with both in vivo and in vitro homologous recombination.
The positive selection method effectively enhances the accuracy of assembling large DNA fragments.

Conclusions:

The developed strategy offers a robust solution for accurate assembly of large DNA constructs.
The positive selection approach simplifies clone screening by minimizing illegitimate assemblies.
This method is adaptable to diverse cloning techniques, broadening its applicability in synthetic biology.