Clostridium difficile (bacteria)

Clostridium difficile
C. difficile colonies on a blood agar plate
Micrograph of Clostridium difficile
Scientific classification
Kingdom:	Bacteria
Phylum:	Firmicutes
Class:	Clostridia
Order:	Clostridiales
Family:	Clostridiaceae
Genus:	Clostridium pdf
Species:	C. difficile
Binomial name
Clostridium difficile Hall & O'Toole, 1935

Clostridium difficile (etymology and pronunciation), also known as C. difficile, C. diff (/siː/ /dɪf/), or sometimes CDF/cdf, is a species of Gram-positive spore-forming bacteria.^[1]

Clostridia (members of the genus Clostridium) are anaerobic, motile bacteria, ubiquitous in nature, and especially prevalent in soil. Under the microscope, they appear as long, irregular (often drumstick- or spindle-shaped) cells with a bulge at their terminal ends. Under Gram staining, C. difficile cells are Gram-positive and show optimum growth on blood agar at human body temperatures in the absence of oxygen. When stressed, the bacteria produce spores that are able to tolerate extreme conditions that the active bacteria cannot tolerate.^[2]

C. difficile may become established in the human colon; it is present in 2–5% of the adult population.^[2] Sometimes antibiotic therapy for various infections has the adverse effect of disrupting the normal balance of the gut flora, in which case C. difficile may opportunistically dominate, causing Clostridium difficile colitis.

Human pathogen

Pathogenic C. difficile strains produce multiple toxins. The most well-characterized are enterotoxin (Clostridium difficile toxin A) and cytotoxin (Clostridium difficile toxin B), both of which may produce diarrhea and inflammation in infected patients (Clostridium difficile colitis), although their relative contributions have been debated.^[2] Toxins A and B are glucosyltransferases that target and inactivate the Rho family of GTPases. Toxin B (cytotoxin) induces actin depolymerization by a mechanism correlated with a decrease in the ADP-ribosylation of the low molecular mass GTP-binding Rho proteins.^[3] Another toxin, binary toxin, also has been described, but its role in disease is not fully understood.^[4]

Antibiotic treatment of C. diff infections may be difficult, due both to antibiotic resistance and physiological factors of the bacteria (spore formation, protective effects of the pseudomembrane).^[2] The emergence of a new, highly toxic strain of C. difficile, resistant to fluoroquinolone antibiotics, such as ciprofloxacin and levofloxacin, said to be causing geographically dispersed outbreaks in North America, was reported in 2005.^[5] The U.S. Centers for Disease Control (CDC) in Atlanta warned of the emergence of an epidemic strain with increased virulence, antibiotic resistance, or both.^[6]

C. difficile is transmitted from person to person by the fecal-oral route. However, the organism forms heat-resistant spores that are not killed by alcohol-based hand cleansers or routine surface cleaning. Thus, these spores survive in clinical environments for long periods. Because of this, the bacteria may be cultured from almost any surface. Once spores are ingested, their acid-resistance allows them to pass through the stomach unscathed. They germinate and multiply into vegetative cells in the colon upon exposure to bile acids.

A 2015 CDC study estimated that C. diff afflicted almost half a million Americans and caused 29,000 deaths in 2011. The study estimated that 40 percent of cases began in nursing homes or community health care settings, while 24 percent occurred in hospitals.^[7]

Strains

In 2005, molecular analysis led to the identification of the C. difficile strain type characterized as group BI by restriction endonuclease analysis, as North American pulse-field-type NAP1 by pulsed-field gel electrophoresis and as ribotype 027; the differing terminology reflects the predominant techniques used for epidemiological typing. This strain is referred to as C. difficile BI/NAP1/027.^[8]

Genome

Genomic information

NCBI genome ID	535?
Ploidy	haploid
Genome size	4.3 Mb
Number of chromosomes	1
Year of completion	2005

The first complete genome sequence of a C. difficile strain was first published in 2005 by Sanger Institute in the UK. This was of the strain 630, a virulent and multiple drug-resistant strain isolated in Switzerland in 1982. Scientists at Sanger Institute have sequenced genomes of about 30 C. difficile isolates using next-generation sequencing technologies from 454 Life Sciences and Illumina.^[9]

Researchers at McGill University in Montreal sequenced the genome of the highly virulent Quebec strain of C. difficile in 2005 using ultra-high-throughput sequencing technology. The tests involved doing 400,000 DNA parallel-sequencing reactions of the bacterium's genome, which had been fragmented for sequencing. These sequences were assembled computationally to form a complete genome sequence.^[5][10]

In 2012, scientists at University of Oxford sequenced C. difficile genomes from 486 cases arising over four years in Oxfordshire using next-generation sequencing technologies from Illumina.^[11]

Bacteriophage

At least eight mainly temperate bacteriophages have been isolated from C. difficile, ranging in genome size from about 30 to about 60 kb.^[12] Both environmentally and clinically derived C. difficile strains carry a diverse and prevalent set of prophages.^[12]

Etymology and pronunciation

The species name is New Latin, from the Greek kloster (κλωστήρ), "spindle",^[13] and Latin difficile, "difficult, obstinate".^[14] It is pronounced /klɔːˈstrɪdiəm/ /dᵻˈfɪsᵻli/ in medical English^[15] (compare classical Latin /difˈfi.ki.leː/), although spelling pronunciations such as /ˈdɪfᵻsil/ and /dᵻfᵻsˈiːl/ are commonly heard. The latter two are approximately comparable to the pronunciations of the obsolete English adjective difficile and the French adjective difficile.

References

1. Moreno MA, Furtner F, Rivara FP; Furtner; Rivara (June 2013). "Clostridium difficile: A Cause of Diarrhea in Children". JAMA Pediatrics 167 (6): 592. doi:10.1001/jamapediatrics.2013.2551. PMID 23733223.
2. Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 322–4. ISBN 0-8385-8529-9.
3. Just I, Selzer J, von Eichel-Streiber C, Aktories K; Selzer; von Eichel-Streiber; Aktories (1995). "The low molecular mass GTP-binding protein Rh is affected by toxin a from Clostridium difficile". The Journal of Clinical Investigation 95 (3): 1026–31. doi:10.1172/JCI117747. PMC 441436. PMID 7883950.
4. Barth H, Aktories K, Popoff MR, Stiles BG; Aktories; Popoff; Stiles (2004). "Binary Bacterial Toxins: Biochemistry, Biology, and Applications of Common Clostridium and Bacillus Proteins". Microbiology and Molecular Biology Reviews : MMBR 68 (3): 373–402, table of contents. doi:10.1128/MMBR.68.3.373-402.2004. PMC 515256. PMID 15353562.
5. Loo VG, Poirier L, Miller MA, Oughton M, Libman MD, Michaud S, Bourgault AM, Nguyen T, Frenette C, Kelly M, Vibien A, Brassard P, Fenn S, Dewar K, Hudson TJ, Horn R, René P, Monczak Y, Dascal A; Poirier; Miller; Oughton; Libman; Michaud; Bourgault; Nguyen; Frenette; Kelly; Vibien; Brassard; Fenn; Dewar; Hudson; Horn; René; Monczak; Dascal (December 2005). "A predominantly clonal multi-institutional outbreak of Clostridium difficile-associated diarrhea with high morbidity and mortality". The New England Journal of Medicine 353 (23): 2442–9. doi:10.1056/NEJMoa051639. PMID 16322602.
6. McDonald LC (August 2005). "Clostridium difficile: responding to a new threat from an old enemy" (PDF). Infection Control and Hospital Epidemiology : The Official Journal of the Society of Hospital Epidemiologists of America 26 (8): 672–5. doi:10.1086/502600. PMID 16156321.
7. Belluck, Pam (February 25, 2015). "Death Toll From C. Difficile Is Raised". The New York Times. Retrieved February 2015.
8. Rupnik M, Wilcox MH, Gerding DN; Wilcox; Gerding (July 2009). "Clostridium difficile infection: New developments in epidemiology and pathogenesis". Nature Reviews. Microbiology 7 (7): 526–36. doi:10.1038/nrmicro2164. PMID 19528959.
9. He M, Sebaihia M, Lawley TD, Stabler RA, Dawson LF, Martin MJ, Holt KE, Seth-Smith HM, Quail MA, Rance R, Brooks K, Churcher C, Harris D, Bentley SD, Burrows C, Clark L, Corton C, Murray V, Rose G, Thurston S, van Tonder A, Walker D, Wren BW, Dougan G, Parkhill J; Sebaihia; Lawley; Stabler; Dawson; Martin; Holt; Seth-Smith; Quail; Rance; Brooks; Churcher; Harris; Bentley; Burrows; Clark; Corton; Murray; Rose; Thurston; Van Tonder; Walker; Wren; Dougan; Parkhill (April 2010). "Evolutionary dynamics of Clostridium difficile over short and long time scales" (PDF). Proceedings of the National Academy of Sciences of the United States of America 107 (16): 7527–32. Bibcode:2010PNAS..107.7527H. doi:10.1073/pnas.0914322107. PMC 2867753. PMID 20368420.
10. Scientists map C. difficile strain - Institute of Public Affairs, Montreal
11. Didelot X, Eyre DW, Cule M, Ip CL, Ansari MA, Griffiths D, Vaughan A, O'Connor L, Golubchik T, Batty EM, Piazza P, Wilson DJ, Bowden R, Donnelly PJ, Dingle KE, Wilcox M, Walker AS, Crook DW, A Peto TE, Harding RM; Eyre; Cule; Ip; Ansari; Griffiths; Vaughan; O'Connor; Golubchik; Batty; Piazza; Wilson; Bowden; Donnelly; Dingle; Wilcox; Walker; Crook; Peto; Harding (December 2012). "Microevolutionary analysis of Clostridium difficile genomes to investigate transmission" (PDF). Genome Biology 13 (12): R118. doi:10.1186/gb-2012-13-12-r118. PMC 4056369. PMID 23259504.
12. Hargreaves KR, Clokie MR; Clokie (2014). "Clostridium difficile phages: Still difficult?". Frontiers in Microbiology 5: 184. doi:10.3389/fmicb.2014.00184. PMC 4009436. PMID 24808893.
13. Liddell-Scott. "κλωστήρ". Greek-English Lexicon (Oxford){{inconsistent citations}}
14. Cawley, Kevin. "Difficilis". Latin Dictionary and Grammar Aid (University of Notre Dame). Retrieved 2013-03-16{{inconsistent citations}}
15. Wolters Kluwer, Stedman's Medical Dictionary, Wolters Kluwer.