Blotting/Hybridization techniques

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DNA probe joins together (hybridizes) with target DNA blotted on a membraneec

DNA probe joins together (hybridizes) with target DNA blotted on a membrane

Term: 2014
Published: February 26, 2014
Revised: March 31, 2014

What is hybridization / blotting?

Blotting of nucleic acid is the central technique for hybridization studies. Double stranded DNA will denature or separate at high temperatures into single strands. When the temperature is lowered, the two strands will anneal because of the base pairing interaction between the complementary strands. If nucleotide sequences are identical or similar, complementary strands from different sources will anneal. This is called hybridization to indicate that each strand of DNA came from a different source.

The single strands that hybridize to one another to form double stranded DNA are homologous (have similar or identical nucleotide sequences). This high specificity of base pairing interaction between complementary strands of DNA can be used to locate specific nucleotide sequences in a sample. The DNA from one source can be immobilized by attachment to a solid surface. Homologous DNA from another source will hybridize to the immobilized DNA.  Non-homologous DNA will not bind / attach. This is the basis of DNA probe techniques. A probe is a piece of DNA with a specific nucleic acid sequence that is labelled with a marker which allows identification and quantification.

About The Instructor

Dr Henriette van Heerden

Dr Henriette van Heerden

  • BSc (UOVS), BSc Hons Microbiology (UOVS), MSc Micobiology (UOVS),PhD
  • Senior Lecturer: Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, South Africa
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This Work, Blotting/Hybridization techniques, by Dr Henriette van Heerden is licensed under a Creative Commons Attribution license.