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DNA Isolation

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DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

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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...

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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...

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Related Experiment Video

Updated: Jul 5, 2026

Large Insert Environmental Genomic Library Production

Large Insert Environmental Genomic Library Production

Published on: September 23, 2009

Construction of small-insert libraries from genomic DNA.

¹Whitehead Institute, Cambridge, Massachusetts, USA.

Current Protocols in Human Genetics

|April 23, 2008

Summary

This study details constructing small-insert genomic libraries by ligating size-selected DNA fragments to vector DNA. Methods include restriction digestion, sonication, size selection, and ligation with T4 DNA ligase for transformation into Escherichia coli.

Area of Science:

Molecular Biology
Genomics
Biotechnology

Background:

Genomic library construction is crucial for genetic research and analysis.
Efficient methods are needed to generate libraries with specific insert sizes.

Purpose of the Study:

To describe a detailed protocol for creating small-insert genomic libraries.
To outline the key steps and reagents involved in library construction.

Main Methods:

Vector DNA preparation via restriction digestion and dephosphorylation.
Insert DNA generation through restriction digestion or sonication, followed by size selection on agarose gel.
Ligation of insert and vector DNA using T4 DNA ligase and transformation into competent Escherichia coli cells.

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Main Results:

Successful generation of small-insert genomic libraries.
Demonstration of a reliable method for DNA fragment size selection and ligation.

Conclusions:

The described method provides a robust approach for constructing small-insert genomic libraries.
This protocol is valuable for various downstream genomic applications.