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Scientific classification
Domain: Bacteria
Phylum: Chloroflexi
Class: Dehalococcoidetes
Genus: Dehalococcoides
Maymo-Gatell et al. 1997

  • D. ethenogenes

Dehalococcoides is a genus of bacteria within class Dehalococcoidetes that obtain energy via the oxidation of hydrogen gas and subsequent reductive dehalogenation of halogenated organic compounds.[1]


Reductive dehalogination

Dehalococcoides ethenogenes strain 195 was first described in 1997, and is noted for its potential use in the bioremediation of tetrachloroethene (PCE) and trichloroethene (TCE) contaminated ground water sites.[2][3] High D. ethenogenes population numbers and electron substrate concentrations are necessary for effective bioremediation of dense non-aqueous phase liquids (DNAPL) contamination sites. Addition of either fermentable substrate to create hydrogen gas in situ, or inoculation of the site with mixed cultures containing Dehalococcoides are required for effective remediation.

Other dechlorinating microbes are also responsible for the PCE → TCE → 1,2-Dichloroethene (1,2-DCE) sequence of ethene dehalogenation,[2] but these organisms often fail to continue the degradation sequence from 1,2-DCE to vinyl chloride (VC), and finally, ethene (1,2-DCE → VC → ethene), which is environmentally benign. Dehalococcoides effectively converts 1,2-DCE to VC, and its presence in groundwater may be necessary for proper bioremediation of contaminated sites.

Mixed Dehalococcoides species can also bioremediate environmental sites contaminated with polychlorinated biphenyls (PCBs).[4]


  1. ^ See the NCBI webpage on Dehalococcoides. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.  
  2. ^ a b Maymo-Gatell X, Chien Y, Gossett JM, Zinder SH (1997). "Isolation of a bacterium that reductively dechlorinates tetrachloroethene to ethene". Science 276: 1568–1571. doi:10.1126/science.276.5318.1568. PMID 9171062.  
  3. ^ Steele, Bill (2007-06-14). "Computer modeling could help chlorine-hungry bacteria break down toxic waste". Chronicle Online. Cornell University. Retrieved 2007-11-24.  
  4. ^ Bedard, Donna L.; Kirsti M. Ritalahti and Frank E. Löffler (April 2007). "The Dehalococcoides Population in Sediment-Free Mixed Cultures Metabolically Dechlorinates the Commercial Polychlorinated Biphenyl Mixture Aroclor 1260". Applied and Environmental Microbiology 73 (8): p. 2513–2521. doi:10.1128/AEM.02909-06.  

See also

External links



Up to date as of January 23, 2010

From Wikispecies


Main Page
Superregnum: Bacteria
Regnum: Bacteria
Phylum: Chloroflexi
Class: Dehalococcoidetes
Genus: Dehalococcoides
Species: Dehalococcoides ethenogenes - Dehalococcoides sp. FL2 - environmental samples - Dehalococcoides sp. BHI80-15 - Dehalococcoides sp. BHI80-52 - Dehalococcoides sp. BAV1 - unclassified Dehalococcoides - Dehalococcoides sp. CBDB1 - Dehalococcoides sp. KB-1/PCE - Dehalococcoides sp. KB-1/VC - Dehalococcoides sp. Pinellas - Dehalococcoides sp. TM-EtOH - Dehalococcoides sp. WL - Dehalococcoides sp. VS - Dehalococcoides sp. H10 - Dehalococcoides sp. KM-2005 - Dehalococcoides sp. KB1 - Dehalococcoides sp. FMC-TCE - Dehalococcoides sp. SFR-cis-DCE - Dehalococcoides sp. SNR-PCE - Dehalococcoides sp. Owls-PCE - Dehalococcoides sp. LH-PCE - Dehalococcoides sp. CH-PCE - Dehalococcoides sp. BRS-PCE - Dehalococcoides sp. JN18_A30_B - Dehalococcoides sp. JN18_A96_B* - Dehalococcoides sp. JN18_V108_B - Dehalococcoides sp. JN18_V12_B - Dehalococcoides sp. JN18_V35_B - Dehalococcoides sp. JN18_V4_B - Dehalococcoides sp. MB - Dehalococcoides sp. GT -



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