Phase and antigenic variation in bacteria

被引:526
作者
van der Woude, MW
Bäumler, AJ
机构
[1] Univ Penn, Sch Med, Dept Microbiol, Philadelphia, PA 19104 USA
[2] Texas A&M Univ, Coll Med, Syst Hlth Sci Ctr, Dept Med Microbiol & Immunol, College Stn, TX 77843 USA
关键词
D O I
10.1128/CMR.17.3.581-611.2004
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Phase and antigenic variation result in a heterogenic phenotype of a clonal bacterial population, in which individual cells either express the phase-variable protein(s) or not, or express one of multiple antigenic forms of the protein, respectively. This form of regulation has been identified mainly, but by no means exclusively, for a wide variety of surface structures in animal pathogens and is implicated as a virulence strategy. This review provides an overview of the many bacterial proteins and structures that are under the control of phase or antigenic variation. The context is mainly within the role of the proteins and variation for pathogenesis, which reflects the main body of literature. The occurrence of phase variation in expression of genes not readily recognizable as virulence factors is highlighted as well, to illustrate that our current knowledge is incomplete. From recent genome sequence analysis, it has become clear that phase variation may be more widespread than is currently recognized, and a brief discussion is included to show how genome sequence analysis can provide novel information, as well as its limitations. The current state of knowledge of the molecular mechanisms leading to phase variation and antigenic variation are reviewed, and the way in which these mechanisms form part of the general regulatory network of the cell is addressed. Arguments both for and against a role of phase and antigenic variation in immune evasion are presented and put into new perspective by distinguishing between a role in bacterial persistence in a host and a role in facilitating evasion of cross-immunity. Finally, examples are presented to illustrate that phase-variable gene expression should be taken into account in the development of diagnostic assays and in the interpretation of experimental results and epidemiological studies.
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页码:581 / +
页数:32
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