Bacterial Populations Active in Metabolism of C sub(1) Compounds in the Sediment of Lake Washington, a Freshwater Lake
Active members of the bacterial community in the sediment of Lake Washington, with special emphasis on C sub(1) utilizers, were identified by employing two complementary culture-independent approaches: reverse transcription of environmental mRNA and 16S rRNA combined with PCR (RT-PCR) and stable-iso...
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Published in | Applied and environmental microbiology Vol. 71; no. 11; pp. 6885 - 6899 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.11.2005
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Subjects | |
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Abstract | Active members of the bacterial community in the sediment of Lake Washington, with special emphasis on C sub(1) utilizers, were identified by employing two complementary culture-independent approaches: reverse transcription of environmental mRNA and 16S rRNA combined with PCR (RT-PCR) and stable-isotope probing (SIP) of DNA with the super(13)C-labeled C sub(1) substrates methanol, methylamine, formaldehyde, and formate. Analysis of RT-PCR-amplified fragments of 16S rRNA-encoding genes revealed that gammaproteobacterial methanotrophs belonging to Methylobacter and Methylomonas dominate the active methylotroph population, while only one other known methylotrophic lineage, Methylophilaceae, was detected via this approach. Analysis of RT-PCR-amplified functional genes, pmoA and fae, allowed detection of alphaproteobacterial (Methylosinus) and gammaproteobacterial (Methylobacter, Methylomonas, and Methylomicrobium) methanotrophs, methylotrophs of the genus Methylobacterium, and yet-unidentified proteobacteria. SIP experiments allowed detection of a broad variety of groups actively metabolizing C sub(1) compounds. Comparisons between 16S rRNA gene pools amplified from [ super(13)C]DNA and from [ super(12)C]DNA revealed that the proportion of Methylophilus-related sequences increased in the presence of [ super(13)C]methanol, [ super(13)C]methylamine, and [ super(13)C]formaldehyde; Novosphingobium-related sequences were enriched in the presence of [ super(13)C]methanol; Gemmatimonadaceae-related sequences were enriched in the presence of [ super(13)C]formaldehyde and [ super(13)C]formate; and Xanthomonadaceae-related sequences were enriched in the presence of [ super(13)C]formate. Analysis of fae genes amplified from [ super(13)C]DNAs isolated from different microcosms revealed specific shifts in populations in response to a specific C sub(1) compound: Methylosinus sequences dominated the [ super(13)C]methanol microcosm pool, and beta- and gammaproteobacterial sequences dominated the [ super(13)C]methylamine microcosm pool. The [ super(13)C]formaldehyde microcosm was dominated by betaproteobacterial sequences and by sequences of a nonaffiliated group, while the [ super(13)C]formate microcosm was dominated by alpha- and betaproteobacterial sequences. Overall, these data point toward the presence of a diverse population of active methylotrophs in Lake Washington sediments and toward the existence of yet-uncultivated organisms. |
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AbstractList | Active members of the bacterial community in the sediment of Lake Washington, with special emphasis on C sub(1) utilizers, were identified by employing two complementary culture-independent approaches: reverse transcription of environmental mRNA and 16S rRNA combined with PCR (RT-PCR) and stable-isotope probing (SIP) of DNA with the super(13)C-labeled C sub(1) substrates methanol, methylamine, formaldehyde, and formate. Analysis of RT-PCR-amplified fragments of 16S rRNA-encoding genes revealed that gammaproteobacterial methanotrophs belonging to Methylobacter and Methylomonas dominate the active methylotroph population, while only one other known methylotrophic lineage, Methylophilaceae, was detected via this approach. Analysis of RT-PCR-amplified functional genes, pmoA and fae, allowed detection of alphaproteobacterial (Methylosinus) and gammaproteobacterial (Methylobacter, Methylomonas, and Methylomicrobium) methanotrophs, methylotrophs of the genus Methylobacterium, and yet-unidentified proteobacteria. SIP experiments allowed detection of a broad variety of groups actively metabolizing C sub(1) compounds. Comparisons between 16S rRNA gene pools amplified from [ super(13)C]DNA and from [ super(12)C]DNA revealed that the proportion of Methylophilus-related sequences increased in the presence of [ super(13)C]methanol, [ super(13)C]methylamine, and [ super(13)C]formaldehyde; Novosphingobium-related sequences were enriched in the presence of [ super(13)C]methanol; Gemmatimonadaceae-related sequences were enriched in the presence of [ super(13)C]formaldehyde and [ super(13)C]formate; and Xanthomonadaceae-related sequences were enriched in the presence of [ super(13)C]formate. Analysis of fae genes amplified from [ super(13)C]DNAs isolated from different microcosms revealed specific shifts in populations in response to a specific C sub(1) compound: Methylosinus sequences dominated the [ super(13)C]methanol microcosm pool, and beta- and gammaproteobacterial sequences dominated the [ super(13)C]methylamine microcosm pool. The [ super(13)C]formaldehyde microcosm was dominated by betaproteobacterial sequences and by sequences of a nonaffiliated group, while the [ super(13)C]formate microcosm was dominated by alpha- and betaproteobacterial sequences. Overall, these data point toward the presence of a diverse population of active methylotrophs in Lake Washington sediments and toward the existence of yet-uncultivated organisms. |
Author | Chistoserdova, Ludmila Lidstrom, Mary E Nercessian, Olivier Noyes, Emma Kalyuzhnaya, Marina G |
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Title | Bacterial Populations Active in Metabolism of C sub(1) Compounds in the Sediment of Lake Washington, a Freshwater Lake |
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