Complete sequencing and diversity analysis of the enterotoxin-encoding plasmids in Clostridium perfringens type A non-food-borne human gastrointestinal disease isolates.

Abstract

Enterotoxin-producing Clostridium perfringens type A isolates are an important cause of food poisoning and non-food-borne human gastrointestinal diseases, e.g., sporadic diarrhea (SPOR) and antibiotic-associated diarrhea (AAD). The enterotoxin gene (cpe) is usually chromosomal in food poisoning isolates but plasmid-borne in AAD/SPOR isolates. Previous studies determined that type A SPOR isolate F5603 has a plasmid (pCPF5603) carrying cpe, IS1151, and the beta2 toxin gene (cpb2), while type A SPOR isolate F4969 has a plasmid (pCPF4969) lacking cpb2 and IS1151 but carrying cpe and IS1470-like sequences. By completely sequencing these two cpe plasmids, the current study identified pCPF5603 as a 75.3-kb plasmid carrying 73 open reading frames (ORFs) and pCPF4969 as a 70.5-kb plasmid carrying 62 ORFs. These plasmids share an approximately 35-kb conserved region that potentially encodes virulence factors and carries ORFs found on the conjugative transposon Tn916. The 34.5-kb pCPF4969 variable region contains ORFs that putatively encode two bacteriocins and a two-component regulator similar to VirR/VirS, while the approximately 43.6-kb pCPF5603 variable region contains a functional cpb2 gene and several metabolic genes. Diversity studies indicated that other type A plasmid cpe+/IS1151 SPOR/AAD isolates carry a pCPF5603-like plasmid, while other type A plasmid cpe+/IS1470-like SPOR/AAD isolates carry a pCPF4969-like plasmid. Tn916-related ORFs similar to those in pCPF4969 (known to transfer conjugatively) were detected in the cpe plasmids of other type A SPOR/AAD isolates, as well as in representative C. perfringens type B to D isolates carrying other virulence plasmids, possibly suggesting that most or all C. perfringens virulence plasmids transfer conjugatively.

• Authors: Kazuaki Miyamoto, Derek J Fisher, Jihong Li, Sameera Sayeed, Shigeru Akimoto, Bruce A McClane
• Journal: Journal of bacteriology (J Bacteriol) Vol. 188 Issue 4 Pg. 1585-98 (Feb 2006) ISSN: 0021-9193 [Print] United States
• PMID: 16452442 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)

Chemical References

• Enterotoxins

Topics

• Clostridium Infections (microbiology)
• Clostridium perfringens (genetics, metabolism)
• Enterotoxins (metabolism)
• Gastrointestinal Diseases (microbiology)
• Genetic Variation
• Humans
• Molecular Sequence Data
• Plasmids (genetics)