It is one of the cornerstone of molecular genetics. Bacterial transformation is a key step in molecular cloning, the goal of which is to produce multiple copies of a recombinant DNA molecule. What is transformation?• Genetic transformation is the incorporation of naked DNA from the extracellular environment.• It is one of three possible mechanisms of HGT (Horizontal gene transfer)• Cells that can be used for transformation are called competent. It is the transfer of naked DNA from donor cell to recipient cell.

The model of natural transformation for a gram-positive bacterium is as follows: 1. After transformation, the cells may express the acquired genetic information, which may serve as a source of genetic diversity and potentially provide … Prior steps for creating recombinant plasmids are described in traditional cloning basics and involve insertion of a DNA sequence of interest into a vector backbone. Bacteria that can take up free, extracellular genetic material are known as competent cells. According to Griffith, the DNA or gene transfer can occur either naturally or artificially from one type of bacterial cell to the other type of bacteria. The bacterium is exposed to competence factor. Transformation is a key process in molecular cloning, by which multiple copies of recombinant DNA molecules are produced. For example, Transformation of Non-virulent strain to a …

transformation: [ trans″for-ma´shun ] change of form or structure; conversion from one form to another.

Bacterial transformation is a natural process in which cells take up foreign DNA from the environment at a low frequency. In oncology, the change that a normal cell undergoes as it becomes malignant. These swollen bacteria are then known as competent bacteria.

Next, plasmid DNA (containing the foreign DNA) is mixed with the competent bacteria and the solution is heated.

Transformation occurs naturally in some species of bacteria, but it can also be effected by artificial means in other cells.


Bacterial transformation is a process of horizontal gene transfer by which some bacteria take up foreign genetic material (naked DNA) from the environment. The ability to take up free, extracellular genetic material is the prerequisite for bacterial competent cells to undergo transformation.

Transformation is the process of introduction of derived DNA fragments from a donor bacteria into a recipient bacteria. Before transformation, bacteria are treated with a chemical called calcium chloride, which causes water to enter into the cells and makes them swell. In gram-positive bacteria, soluble factor taken from the media of cells in the competent state and added to noncompetent bacteria can induce the competent state in the noncompetent bacteria.

TRANSFORMATION IN BACTERIA PRESENTED BY MONA ALBUREIKAN 2. For transformation to happen, bacteria must be in a state of competence, which might occur as a time-limited response to environmental conditions such as starvation and cell density.

3. Transformation in bacteria was first studied by a scientist Frederick Griffith in the year 1928.