The polychaete Capitella capitata sp.I has a high capacity to metabolize polycyclic aromatic hydrocarbons (PAHs) which are
among the most hazardous environmental pollutants with significant biological effects. In the present study, two novel cytochrome
P450 (CYP) genes were identified in this species. One was named CYP331A1, the first member of a new family of CYP331, and the
other CYP4AT1 is the first member of a new subfamily CYP4AT. Both of these genes are constitutively expressed in the worms and
detectable by RT-PCR. The expression of CYP331A1 mRNA was observed to be more sensitive to PAH exposure than CYP4AT1,
which indicated that CYP331A1 should play a more important role than CYP4AT1 in PAH metabolism in this species. Considering
the importance of C. capitata sp.I in taking up PAH and other organic pollutants from contaminated marine sediments with the
potential for subsequent food-chain transfer, our results are important for understanding the molecular basis of biotransformation
and detoxification in this invertebrate, and also have evolutionary significance for understanding the diversity and history of the
CYP superfamily.
2004 Elsevier Inc. All rights reserved.
The polychaete Capitella capitata sp.I has a high capacity to metabolize polycyclic aromatic hydrocarbons (PAHs) which areamong the most hazardous environmental pollutants with significant biological effects. In the present study, two novel cytochromeP450 (CYP) genes were identified in this species. One was named CYP331A1, the first member of a new family of CYP331, and theother CYP4AT1 is the first member of a new subfamily CYP4AT. Both of these genes are constitutively expressed in the worms anddetectable by RT-PCR. The expression of CYP331A1 mRNA was observed to be more sensitive to PAH exposure than CYP4AT1,which indicated that CYP331A1 should play a more important role than CYP4AT1 in PAH metabolism in this species. Consideringthe importance of C. capitata sp.I in taking up PAH and other organic pollutants from contaminated marine sediments with thepotential for subsequent food-chain transfer, our results are important for understanding the molecular basis of biotransformationand detoxification in this invertebrate, and also have evolutionary significance for understanding the diversity and history of theCYP superfamily. 2004 Elsevier Inc. All rights reserved.
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