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Gene Regulation

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Subject: 
Biology
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Tags: 
Biology
Gene expression
biochemistry
Promoter
Transcriptional regulation
Transcription
Enhancer
TATA box
RNA polymerase
Gene
TATA-binding protein
Regulation of gene expression
health

Gene Regulation in Eukaryotes The latest estimates are that a human cell, a eukaryotic cell, contains some 21,000 genes. Some of these are expressed in all cells all the time. These so-called housekeeping genes are responsible for the routine metabolic functions (e.g. respiration) common to all cells. Some are expressed as a cell enters a particular pathway of differentiation. Some are expressed all the time in only those cells that have differentiated in a particular way. For example, a plasma cell expresses continuously the genes for the antibody it synthesizes. Some are expressed only as conditions around and in the cell change. For example, the arrival of a hormone may turn on (or off) certain genes in that cell.

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