Conservation and diversity of sap homologues and their organization among Campylobacter fetus isolates.

Abstract:

:Campylobacter fetus surface layer proteins (SLPs), encoded by sapA homologues, are important in virulence. In wild-type C. fetus strain 23D, all eight sapA homologues are located in the 54-kb sap island, and SLP expression reflects the position of a unique sapA promoter in relation to the sapA homologues. The extensive homologies in the sap island include both direct and inverted repeats, which allow DNA rearrangements, deletion, or duplication; these elements confer substantial potential for genomic plasticity. To better understand C. fetus sap island diversity and variation mechanisms, we investigated the organization and distribution of sapA homologues among 18 C. fetus strains of different subspecies, serotypes, and origins. For all type A strains, the boundaries of the sap island were relatively consistent. A 187-bp noncoding DNA insertion near the upstream boundary of the sap island was found in two of three reptile strains studied. The sapA homologue profiles were strain specific, and six new sapA homologues were recognized. Several homologues from reptile strains are remarkably conserved in relation to their corresponding mammalian homologues. In total, the observed differences suggest that the sap island has evolved differing genotypes that are plastic, perhaps enabling colonization of varied niches, in addition to antigenic variation.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Tu ZC,Hui J,Blaser MJ

doi

10.1128/iai.72.3.1715-1724.2004

keywords:

subject

Has Abstract

pub_date

2004-03-01 00:00:00

pages

1715-24

issue

3

eissn

0019-9567

issn

1098-5522

journal_volume

72

pub_type

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