Bacteroides dorei

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Classification

Higher order taxa:

Bacteria; Bacteroidetes; Bacteroidetes; Bacteroidales; Bacteroidaceae; Bacteroides


Species

Genus species: B. acidifaciens, B. distasonis, B. gracilis, B. fragilis, B. oris, B. ovatus, B. putredinis, B. pyogenes, B. stercoris, B. suis, B. tectus, B. thetaiotaomicron, B. vulgatus

Description and significance

Bacteroides dorei are Gram-negative bacteria that are anaerobic rods. Cells size was 1.6 to 4.2 micrometers by 0.8 to 1.2 micrometers. The strains of this particular bacteria were found to thrive most at an optimum temperature of 37 degrees Celsius. They are non-motile and also do not form spores. The DNA G and C contents were found to be 43 mol%. Bacteroides dorei plays an important role in the normal function of the intestinal system of both human and animal species. Along with many beneficial functions, it come with a few pathogenic functions that could take place as well. It was originally names after Joel Dore in recognition of the large role he played in the understand of the intestines.

Ecology

Bacteroides dorei is found in the gastrointestinal tract of both humans and animals. Here they play a large role in contributing to normal intestinal functioning. There is a relationship between the bile in the intestinal tract for the allowance of the bacterial growth in return for regulation of normal intestinal physiology. This plays a role in the health of the human and/or animals health. There was a research study where Bacteroides dorei was found in chinchilla feces. The linkage between the fecal bacteria of humans and animals allows researchers to make more connections between the two.

Pathology

Bacteroides species are known for being opportunist pathogenic bacteria found in anaerobic infections. This means the bacteria that is normally not seen as pathogenic can take advantage of certain situations, such as a weakened immune system as a chance to infect the human and/or animal. When there is a disruption in a mucosal barrier Bacteroides bacterium is able to enter and create a pathogen. Recent studies viewed the effects of Bacteroides in association with Bifidobacterium and LAB populations. The research came to the conclusion that Bacteroides, Bifidobacterium and LAB populations that can be found in the small intestine can be related to Spanish children whom typically have coeliac disease. It is believed that Bacteroides contributes to this disease and the characteristics of the disease.


Metabolism

After a series of tests Bacteroides dorei tested negative for indole production, aesculin, D-Cellobiose, Salicin, and Trehalose. Bacteroides dorei also tested positive for L-Arabinose, L-Rhamnose, D-Sucrose, D-Xylose, and a-Fucosidase. Bacteroides dorei produced acid when there is interaction with glucose, sucrose, xylose, rhamnose, lactose, maltose, arabinose, mannose and raffinose. However, it does not proceed acid when in contact with cellobiose, salicin, treha- lose, mannitol, glycerol, melezitose and sorbitol. Researcher were able to determine that aesculin is not hydrolyzed and nitrate is not reduced within this strain of bacteria. There was also a lack of activity in the presence of urease and gelatin.

Current Research

The International Journal of Systematic and Evolutionary Microbiology are reviewing and isolating Bacteroides dorei to gain further knowledge on the stain 175 T.

The Department of Surgery at the Columbia-Presbyterian Medical Center continue there research as to understanding how to identify patients whom may be at higher risk for Bacteroides infections, as well as what preventable measure could being taking place.

References

1. Bakir, M. A., M. Sakamoto, M. Kitahara, M. Matsumoto, and Y. Benno. "Bacteroides Dorei Sp. Nov., Isolated from Human Faeces." International Journal Of Systematic And Evolutionary Microbiology 56.7 (2006): 1639-643. Print.

2. Bacteroidaceae. (2005). In Merriam-Webster's medical desk dictionary, revised edition. Retrieved from http://www.library.umaine.edu/auth/EZProxy/test/authej.asp?url=http%3A%2F%2Fsearch.credoreference.com.ursus-proxy-1.ursus.maine.edu%2Fcontent%2Fentry%2Fmwmedicaldesk%2Fbacteroidaceae%2F0

3. Lawrence, Peter F., George W. Tietjen, Susan Gingrich, and Thomas C. King. "Bacteroides Bacteremia." Annals of Surgery 186.5 (1977): 559-63. Print.

4. Sanchez, E., E. Donat, C. Ribes-Koninckx, M. Calabuig, and Y. Sanz. "Intestinal Bacteroides Species Associated with Coeliac Disease." Journal of Clinical Pathology 63.12 (2010): 1105-111. Print.

Edited by Kayleigh Beckwith, student of Rachel Larsen at the University of Southern Maine