Pre_GI: SWBIT SVG BLASTN

Query: NC_017179:1133510 Clostridium difficile BI1, complete genome

Lineage: Peptoclostridium difficile; Peptoclostridium; Peptostreptococcaceae; Clostridiales; Firmicutes; Bacteria

General Information: Clostridium difficile BI1 is a human strain isolated in the United States in 1988. This species is now recognized as the major causative agent of pseudomembranous colitis (inflammation of the colon) and diarrhea that may occur following antibiotic treatment. C. difficile infection represents one of the most common nosocomial (originating in a hospital) infections. This bacterium causes a wide spectrum of disease, ranging from mild, self-limiting diarrhea to serious diarrhea and, in some cases, complications such as pseudomembrane formation, toxic megacolon (dilation of the colon) and peritonitis, which often lead to lethality among patients. The bacteria produce high molecular mass polypeptide cytotoxins, A and B. Some strains produce only one of the toxins, others produce both. Toxin A causes inflammatory reaction involving hypersecretion of fluid and hemorrhagic necrosis through triggering cytokine release by neutrophils. Cytotoxin B depolymerizes actin, the major protein of the cytoskeleton, and thus aids in destruction of tissues. The combined action of the toxins results in necrosis of superficial epithelium and edema (fluidic swelling) in affected areas of intestine. Proliferation of C. difficile is normally prevented by normal intestinal microflora, which is believed to inhibit attachment of the bacterium and its toxins to intestinal walls. Alteration of intestinal microbial balance with antibiotic therapy and increased exposure to the bacterium in a hospital setting allows C. difficile to colonize susceptible individuals. Moreover, it has been shown that subinhibitory concentrations of antibiotics promote increased toxin production by C. difficile.

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BLASTN Alignment.txt

Subject: NC_010382:1020516 Lysinibacillus sphaericus C3-41, complete genome

Lineage: Lysinibacillus sphaericus; Lysinibacillus; Bacillaceae; Bacillales; Firmicutes; Bacteria

General Information: Lysinibacillus sphaericus C3-41 was isolated from a mosquito breeding site in China. This organism is highly toxic to Culex species of mosquito. Lysinibacillus sphaericus, formerly Bacillus sphaericus, is a common environmental organism which produces an insecticidal toxin similar to that produced by Bacillus thuringiensis. Lysinibacillus sphaericus produces two proteins during sporulation which accumulate in parasporal crystalline inclusions. These proteins bind in the gastric cavitiy and midgut of the larvae causing disruption of feeding by the infected host and death.