![]() ![]() It has been a widely used technique for over three decades. Southern blot is a method commonly used in molecular biology. Image 6: Southern blotting is a procedure used in a forensic setting such as in the case of rape and other types of crimes that may require identification of DNA samples. How is Southern blotting used in forensics?įorensic laboratories used southern blotting method to detect the smallest quantity of DNA, especially in the case of rape, thieves, or identification of parenthood. It helps detect cancer and genetic diseases like sickle cell mutation and monoclonal leukemia.It has the ability to identify a single gene in a pool of DNA fragments.It helps in restricting fragment length polymorphism.It is helpful in identifying infectious agents.It is used to diagnose a particular disease caused by genetic defects.It helps identify gene rearrangement or mutation in a particular sequence of DNA/gene mapping.In forensics, southern blotting is one of the commonly used procedures, especially in:.It is useful in isolating and identifying the gene of interest.It is used in detecting the DNA in a given sample such as DNA fingerprinting in forensics.Southern blotting is important as it is useful in the various field of interest such as: Image 5: A southern blot is one of the procedures used in paternity testing. Autoradiogram visualization provides a pattern of bands. (3, 7, and 10)Īn autoradiogram is used to visualize the membrane bound DNA that is labeled with a probe. ![]() The probe will bind with the complementary DNA on the membrane. It has complementary sequences to the gene being studied on. What these chemicals do is they saturate the membrane’s binding site.Ī labeled probe is used to treat the membrane-bound DNA. Casein or Bovine serum albumin is used to treat the membrane. The DNA is based on autoclave and fix in the membrane. The DNA’s separated strands are transferred to a positively charged nylon membrane through the process of blotting.īlotting process is done so as to determine the nature of DNA This is where the actual bloating takes place. After denaturation, the strands of DNA will separate. The purpose is to denature the fragments of double-stranded DNA. Once electrophoresis is done, the SDS gel is soaked in either acid like HCl or alkali like NaOH. Picture Source: Īn SDS gel is needed in this step. There are a series of steps that need to be strictly followed when performing Southern blotting. (5, 6, and 7) What are the steps in Southern blotting? The DNA fragments are identified using a labeled probe hybridization. Basically, Southern blotting separates DNA fragments by gel electrophoresis. It is a hybridization method for identifying the size of DNA from a mixture of other similar molecules. Southern blotting is a restriction fragment length polymorphism. What is the principle of Southern blotting? The amount of DNA needed varies depending on the size and specific activity of the probe. How much DNA is needed for Southern blotting? They will be transferred to a membrane, hybridize, washed, and lastly, detecting the labeled DNA band. The Southern blotting method is a classic technique that separates DNA fragments according to their size through electrophoresis. Picture Source: What does Southern blotting reveal?Ī southern blot analysis reveals the following: Image 1: The Southern blot procedure as shown in the image above. ![]()
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