2024, Number 3
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Investigación en Discapacidad 2024; 10 (3)
Exploration of some proteomic techniques: Western blot, Dot blot and two-dimensional electrophoresis, complemented by mass spectrometry
López-Macay A, Montes-Sánchez D, Narváez-Morales J, Salas-Paniagua M, Barrios-Aguilar S, Zamudio-Cuevas Y, Fernández-Torres J, Martínez K
Language: Spanish
References: 51
Page: 187-202
PDF size: 412.65 Kb.
ABSTRACT
The development of proteomics in biomedicine is crucial because proteins are key to cellular functions, making them essential molecules in research to understand their biological role. To do this, it is necessary to consider both their biochemical and electrophysical properties in order to achieve their separation and determination. To study the expression of proteins, techniques such as Western blot (WB), Dot blot (DB) and two-dimensional electrophoresis are used to identify their expression, intensity and important post-translational modifications during biological activity. WB is based on the separation of proteins according to their charge and molecular weight (MW) and their subsequent transfer to a solid membrane so that a specific antibody recognizes the protein of interest. DB does not require electrophoretic separation, but samples are applied directly to a membrane to provide a semiquantitative estimate of protein concentration. Finally, there is two-dimensional polyacrylamide gel electrophoresis (2D-PAGE), which can simultaneously separate more than 1,500 proteins from a single sample and can also be combined with different dyes and other techniques such as mass spectrometry (MS). It is important to note that these methods also require specific means of identifying the proteins of interest, such as a PM marker, stains or antibodies coupled to enzymes or fluorophores. The application of proteomic techniques ranges from basic research to the clinic, with the aim of discovering new biomarkers of biomedical interest. The aim of this review is to provide an overview of the rationale behind these techniques.
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