This secondary test provides higher specificity, distinguishing true positive results from potential cross-reactivity or false positives that might occur in the initial screening phase. This method leverages the power of gel electrophoresis to separate proteins by molecular weight, followed by their transfer to a solid membrane and detection using highly specific antibodies.
Western Blot Examples in Disease Research Applications
A common application involves verifying the successful knockdown of a target protein using siRNA or CRISPR-Cas9 gene editing. Analysis of Protein Isoforms and Size Variants The technique is also indispensable for analyzing protein isoforms or splice variants that differ in molecular weight.
Fundamental Principle and Workflow The core principle relies on the immobilization of proteins on a membrane, typically nitrocellulose or PVDF, where they retain their immunological properties. After separation via SDS-PAGE, the proteins are electrophoretically transferred to the membrane in a process known as electroblotting.
Western Blot Examples in Disease Research Applications
The membrane is then incubated with a primary antibody that specifically binds to the target protein, followed by a secondary antibody conjugated to an enzyme or fluorophore. A western blot example in this context involves using an antibody that recognizes a common epitope to resolve different bands on the membrane, allowing for the identification and quantification of specific isoforms within a tissue sample.
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