TY - JOUR
T1 - Transcriptional Response of Rhodococcus aetherivorans I24 to Polychlorinated Biphenyl-Contaminated Sediments
AU - Puglisi, Edoardo
AU - Cahill, Matt J.
AU - Lessard, Philip A.
AU - Capri, Ettore
AU - Sinskey, Anthony John
AU - Archer, John A.C.
AU - Boccazzi, Paolo
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by IRG Marie Curie Grant "COMEHERE," contract No. 21634, and by the Cambridge-MIT Institute.
PY - 2010/4/6
Y1 - 2010/4/6
N2 - We used a microarray targeting 3,524 genes to assess the transcriptional response of the actinomycete Rhodococcus aetherivorans I24 in minimal medium supplemented with various substrates (e. g., PCBs) and in both PCB-contaminated and non-contaminated sediment slurries. Relative to the reference condition (minimal medium supplemented with glucose), 408 genes were upregulated in the various treatments. In medium and in sediment, PCBs elicited the upregulation of a common set of 100 genes, including gene-encoding chaperones (groEL), a superoxide dismutase (sodA), alkyl hydroperoxide reductase protein C (ahpC), and a catalase/peroxidase (katG). Analysis of the R. aetherivorans I24 genome sequence identified orthologs of many of the genes in the canonical biphenyl pathway, but very few of these genes were upregulated in response to PCBs or biphenyl. This study is one of the first to use microarrays to assess the transcriptional response of a soil bacterium to a pollutant under conditions that more closely resemble the natural environment. Our results indicate that the transcriptional response of R. aetherivorans I24 to PCBs, in both medium and sediment, is primarily directed towards reducing oxidative stress, rather than catabolism. © 2010 Springer Science+Business Media, LLC.
AB - We used a microarray targeting 3,524 genes to assess the transcriptional response of the actinomycete Rhodococcus aetherivorans I24 in minimal medium supplemented with various substrates (e. g., PCBs) and in both PCB-contaminated and non-contaminated sediment slurries. Relative to the reference condition (minimal medium supplemented with glucose), 408 genes were upregulated in the various treatments. In medium and in sediment, PCBs elicited the upregulation of a common set of 100 genes, including gene-encoding chaperones (groEL), a superoxide dismutase (sodA), alkyl hydroperoxide reductase protein C (ahpC), and a catalase/peroxidase (katG). Analysis of the R. aetherivorans I24 genome sequence identified orthologs of many of the genes in the canonical biphenyl pathway, but very few of these genes were upregulated in response to PCBs or biphenyl. This study is one of the first to use microarrays to assess the transcriptional response of a soil bacterium to a pollutant under conditions that more closely resemble the natural environment. Our results indicate that the transcriptional response of R. aetherivorans I24 to PCBs, in both medium and sediment, is primarily directed towards reducing oxidative stress, rather than catabolism. © 2010 Springer Science+Business Media, LLC.
UR - http://hdl.handle.net/10754/561549
UR - http://link.springer.com/10.1007/s00248-010-9650-5
UR - http://www.scopus.com/inward/record.url?scp=77958048005&partnerID=8YFLogxK
U2 - 10.1007/s00248-010-9650-5
DO - 10.1007/s00248-010-9650-5
M3 - Article
C2 - 20369357
SN - 0095-3628
VL - 60
SP - 505
EP - 515
JO - Microbial Ecology
JF - Microbial Ecology
IS - 3
ER -