Definition: Gene expression is the process by which the coded information of a gene is converted into the structures present and operating in the cell.

Expressed genes include those that are transcribed into mRNA and then translated into protein and those that are transcribed into RNA but not translated into protein (e.g., transfer and ribosomal RNAs).

The degree of expression is called expressivity.

Gene expression databases

 MGED Society, Microarray Gene Expression Data Society
 BodyMap at University of Tokyo

In humans

 HuGEIndex.org

By organs

 Kidney development gene expression database ar UCSD, the University of California at San Diego

See also

 knock-down of proteic expression

References

 Kaern M, Elston TC, Blake WJ, Collins JJ. Stochasticity in gene expression: from theories to phenotypes. Nat Rev Genet. 2005 Jun;6(6):451-64. PMID: #15883588#

 Bartel DP, Chen CZ. Opinion: Micromanagers of gene expression: the potentially widespread influence of metazoan microRNAs. Nat Rev Genet. 2004 May;5(5):396-400. PMID: #15143321#