[CRISPR/Cas as the intelligent immune system of bacteria and archea].

The invention of CRISPR is considered to be one of the most breakthrough discoveries in recent years in the history of biology, biotechnology, medicine, as well as the pharmaceutical and agricultural industries. The methods developed using CRISPR create new, previously unattainable possibilities that can significantly improve the quality of life. From the invention of this intelligent immune system to the present day, much research has been done using the CRISPR/Cas systems. The result of these studies was the development of a modern tool for genetic manipulation, which allows for the introduction of many modifications within the DNA, which may contribute to the silencing of the expression of given genes or their overexpression through e.g. mutations or deletions. The paper describes the application of the method for genetic manipulation with the use of the second class system – CRISPR/Cas9 and the advantages of this method and its advantage over the previously used genetic engineering tools, as well as its limitations and disadvantages, which significantly limit the possibility of its application. The potential use of the method was also presented as well as the research carried out with the use of CRSPR/Cas9.