DNA cloning as well as a Southern blot is a procedure utilized to make copies of the DNA sequence. It can be accomplished using different methods and the most commonly used is done using the PCR (polymerase chain reaction). Southern blots are an instrument used to identify particular DNA sequences within the sample. 



It involves segregating the DNA molecules within the sample by size before transferring them onto the membrane. It is re-hybridized using a probe specifically designed for the particular sequence in question. If the probe is able to bind DNA it will produce an identifiable signal. Southern Blots can be utilized to detect variations or to identify the gene’s sequence.

The Southern Blot is named for its inventor, British scientist Edwin Southern. The initial blot was a paper chromatography but it has since changed and is generally a specific type of electrophoresis. It can be accomplished using capillary electrophoresis or slab electrophoresis in a matrix gel.

Process

DNA cloning and Southern blot is a procedure that creates duplicates of DNA sequences that help scientists gain knowledge about the way cells work. The most commonly used method for DNA Cloning is via PCR (polymerase chain reaction). PCR produces multiple duplicates of the gene sequence. Afterwards, a variety of techniques can be employed to isolate the particular sequence for further research.

Southern blots are the method used to find particular DNA sequences within an item. It involves segregating the DNA molecules of the sample according to size, then transferring them to an nitrocellulose filter, then the addition of a DNA probe that will connect on the specific sequence. The DNA is then denatured before it is placed on the gel since single-stranded DNA does not transfer. The presence of radioactivity in specimens exposed to an X-ray film suggests the the DNA sequence that is of importance.

The DNA probe an element made of single-stranded DNA which can be labelled with an isotope radioactive, a fluorescent dye or even an enzyme. It helps to detect particular DNA sequences by the binding of them. The exposure of the probe to film using the right wavelength will reveal whether there are any complementary nucleotides in the sample being examined. Southern blot was initially invented in 1975 by Edwin Southern in 1975 as an improvement over the previous technique of blotting, which was called Northern Blot. The southern blot can be used to determine DNA sequences present in samples as opposed to the northern blot, which is used to identify the RNA sequences.

How is Southern Blot test?

Southern blot can be used to identify specific DNA sequences within the sample. It is employed to determine distinct strains of organisms or individuals which are genetically similar or to differentiate between mutations.

How do I perform the procedure for the Southern Blot test?

The steps below describe the way a Southern Blot test is performed: DNA molecules of this sample is separated according to size, then transferred to a nitrocellulose filter and then added a DNA probe that will bind with the sequence. The DNA is denatured prior to when it is loaded onto the gel, as single-stranded DNA cannot transfer. The presence of radioactivity in specimens exposed to an X-ray films indicates that the sequence of DNA is that is of importance.

An DNA probe an element of single-stranded DNA , also known as RNA which can be labelled with the radioactive isotope, fluorescent dye or even an enzyme. It helps to detect particular DNA sequences by adhering to these. The exposure of the probe to an X-rays with the right wavelength will reveal whether there are complementing nucleotides found in the sample under test.

What is the Southern Blot test serve to identify genetic mutations?

If a mutation is discovered, it could modify the DNA sequence DNA. The probe will attach to a different spot in the gene. This can be determined through exposure of the movie various wavelengths of X-rays but it’s not evident which strand of DNA has been altered.

What types of blotting methods are there?

There are various types of blotting techniques , which differ in their precision in terms of sensitivity, specificity, and application spectrum. These comprise:

  • The Northern Blot lets you find out if a specific sequence of interest is present inside an RNA sample.
  • The Western Blot lets you identify that there exists a certain protein in an analyzed sample.
  • The Southern blot can be used to determine DNA sequences within a sample.
  • The Eastern blot can be used to identify proteins within the membrane.
  • The dot blot can be used to determine a specific nucleotide or protein sequence in the sample.

The differences between Southern and Northern Blotting processes?

The primary difference between Southern and Northern methods of blotting is the Southern blot is able to detect DNA sequences within a sample and the Northern Blot is able to detect DNA sequences. The Southern Blot is also more sensitive to detect DNA sequences than the Northern Blot. In addition it is the Southern Blot is not as demanding of requirements than Northern blot, and therefore is better suited for tests in the forensic field.

What is the process of DNA Cloning?

The steps below explain how DNA cloning can be done:

  1. Large inserts and vector molecules are both cut using one restriction enzyme, resulting in mutually beneficial ends.
  2. The end of the cohesion on the insert and the vector are joined or annealed.
  3. DNA ligase is the enzyme used to join the insert with the vector.
  4. The plasmid containing the DNA molecule recombinant is converted into a host in which it can reproduce in the course of time.
  5. It is then isolated, and extracted from host cells.
  6. The clone is sequenced in order to identify the sequence of the insert.

The Southern Blot technique can be used to identify DNA mutations. If a mutation occurs it can modify the DNA sequence DNA. The probe will attach to a different spot within the gene. This can be determined through exposure of the movie different wavelengths of X-rays, however, it is not evident which strand of DNA has been altered.

The Northern Blot is a technique that is used to identify the RNA sequences present in a sample. It is less demanding than the Southern blot, and therefore is more appropriate for tests that are used in forensics. The primary difference between Northern as well as Southern blots are that Northern Blot is able to detect RNA sequences within the sample. In contrast, the Southern Blot is able to only identify DNA-based sequences. Furthermore the Northern Blot requires radioactive probes, whereas the Southern blot is able to use either enzyme-based or fluorescence-based probes.