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DNA Isolation01:34

DNA Isolation

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DNA from cells is required for many biotechnology and research applications, such as molecular cloning. To remove and purify DNA from cells, researchers use various methods of DNA extraction. While the specifics of different protocols may vary, some general concepts underlie the process of DNA extraction.
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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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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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Isolation of Genomic DNA from Mouse Tails
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Isolation and Quantification of DNA.

Michael R Green, Joseph Sambrook

    Cold Spring Harbor Protocols
    |June 3, 2018
    PubMed
    Summary

    High-purity DNA isolation is crucial for efficient molecular biology techniques. This overview explores historical and modern methods for DNA purification and quantification from diverse sources.

    Area of Science:

    • Molecular Biology
    • Biochemistry

    Background:

    • DNA purification is essential for downstream enzymatic reactions.
    • Early methods for DNA isolation emerged in the mid-20th century.
    • Numerous protocols exist for DNA purification from various biological materials.

    Purpose of the Study:

    • To provide an overview of DNA isolation and quantification methods.
    • To highlight the importance of DNA purity in molecular biology.

    Main Methods:

    • Literature review of historical and contemporary DNA purification techniques.
    • Discussion of methods for releasing DNA from cells.
    • Examination of strategies to remove inhibitory substances.

    Main Results:

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  • The efficiency of enzymatic reactions is directly proportional to DNA purity.
  • A wide array of DNA purification protocols have been developed.
  • Methods address diverse biological sample types.

    • Conclusions:

    • Effective DNA purification is fundamental for successful molecular cloning and enzymatic applications.
    • Understanding various isolation and quantification techniques is key for researchers.