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Molecular switches — the ON and OFF of bacterial phase variation
Author(s) -
Henderson Ian R.,
Owen Peter,
Nataro James P.
Publication year - 1999
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1046/j.1365-2958.1999.01555.x
Subject(s) - phase variation , biology , variation (astronomy) , phenotype , gene , bacterial transcription , genetics , transcription factor , bacteria , gene expression , mechanism (biology) , transcription (linguistics) , computational biology , promoter , philosophy , physics , linguistics , epistemology , astrophysics
The expression of most bacterial genes is controlled at the level of transcription via promoter control mechanisms that permit a graded response. However, an increasing number of bacterial genes are found to exhibit an ‘all‐or‐none’ control mechanism that adapts the bacterium to more than one environment. One such mechanism is phase variation, traditionally defined as the high‐frequency ON↔OFF switching of phenotype expression. Phase variation events are usually random, but may be modulated by environmental conditions. The mechanisms of phase variation events and their significance within the microbial community are discussed here.