Gene knockdown

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Overview

A gene knockdown is either a genetically modified organism that carries one or more genes in its chromosomes that has been made less active or had its "expression" reduced or is the use of a reagent such as a short DNA or RNA (oligonucleotide) with sequence complementary to an active gene or its mRNA transcript. This oligonucleotide will bind to this active gene (or its transcripts) to decrease expression of a specific gene, copying the effects of such a genetic modification. So far such organisms have been engineered chiefly for research purposes. Also known as knockdown organisms or simply knockdowns, their most direct use is for learning about a gene that has been sequenced, but has an unknown or incompletely known function, an experimental approach known as reverse genetics. Researchers draw inferences from how the knockdown differs from individuals in which the gene of interest has not been made inoperative. Knockdown includes the processes of modifying an organism (as described above) or of using a reagent to suppress gene expression, as in "knocking down a gene."

Popular reagent-based methods of knocking down the expression of a gene include suppression of translation using small interfering RNA (siRNA) or Morpholino oligos.

See also

• gene knockoutde:Knockdown

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .