= The detectable effect of a gene in the phenotype All of our genes are in every cell of our body We can have so many different kinds of cells because not all genes are turned on and functioning all the time Only some are working at any one time in each cell Sometimes a gene turns on due to something in the enviorment and sometimes some internal process causes a gene to begin or stop functioning An example is the effect of the emphasema gene on people who smoke Those with that gene who smoke get emphysema 15 years younger than those who do not smoke Smoking (environment) alters when this gene is expressed (turned on) See Expressing a Gene
In general, the process by which proteins are made from the instructions encoded in DNA Specifically, the conversion of information from gene to protein via transcription (i e , generation of mRNA) and translation Transcription is the assembly of complementary single-stranded RNA from a DNA template Translation is the process of converting RNA to protein by the assembly of a polypeptide chain from an mRNA molecule at the ribosome In some instances, "gene expression" is used to refer to the presence, amount, and time-course of one or more gene products in a particular cell or tissue Expression studies are typically performed at the RNA (mRNA) or protein level in order to determine the number, type, and level of genes that may be up-regulated or down-regulated during a cellular process, in response to an external stimulus, or in sickness or disease Microarrays and proteomics now allow the study of expression profiles of sets of genes or even entire genomes
The conversion of DNA sequence information to a phenotype Gene expression involves activation of transcription, processing of the transcript, translation of structural genes, and assembly of the protein products
The process by which a gene's coded information is converted into proteins Expressed genes include those that are transcribed into messenger RNA and translated into proteins as well as those that are transcribed into RNA but not into proteins
-The process by which the information encoded in a gene is converted into protein or some form of RNA The DNA sequence is first transcribed into RNA and then usually translated into protein
The process by which genes are transcribed and translated into proteins Age-related changes in gene expression may account for some of the phenomena of aging
The process by which a gene's coded information 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) *