Transcriptomics

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A metagenomic study revealing unexpectedly diverse functional groups in microbial communities of deep-ground oil


ABSTRACT: Samples of oil and production water were collected from five wells of the Qinghai Oilfield, China, and subjected to GeoChip hybridization experiments for microbial functional diversity profiling. Unexpectedly, a remarkable microbial diversity in oil samples, which was higher than that in the corresponding water samples, was observed, thus challenging previously believed assumptions about the microbial diversity in this ecosystem. Hierarchical clustering separated oil and water samples, thereby indicating distinct functional structures in the samples. Genes involved in the degradation of hydrocarbons, organic remediation, stress response, and carbon cycling were significantly abundant in crude oil, which is consistent with their important roles in residing in oil. Association analysis with environmental variables suggested that oil components comprising aromatic hydrocarbons, aliphatic hydrocarbons, and a polar fraction with nitrogen-, sulfur-, and oxygen-containing compounds were mainly influential on the structure of the microbial community. Furthermore, a comparison of microbial communities in oil samples indicated that the structures were depth/temperature-dependent. To our knowledge, this is the first thorough study to profile microbial functional diversity in crude oil samples. From the Qinghai Oilfield located in the Tibetan Plateau, northwest China, oil production mixtures were taken from four oil production wells (No. 813, 516, 48 and 27) and one injection well (No. 517) in the Yue-II block. The floating oil and water phases of the production mixtures were separated overnight by gravitational separation. Subsequently, the microbial community and the characteristics of the water solution (W813, W516, W48, and W27) and floating crude oil (O813, O516, O48, and O27) samples were analyzed. A similar analysis was performed with the injection water solution (W517).

ORGANISM(S): uncultured bacterium  

SUBMITTER: Ze-Shen Liu   Yue-Qin Tang  Xing-Biao Wang  Yong Nie  Man Cai  Yunfeng Yang  Xiao-Lei Wu  Chang-Qiao Chi  Jizhong Zhou  Yan Li 

PROVIDER: E-GEOD-55293 | ArrayExpress | 2016-04-01

SECONDARY ACCESSION(S): GSE55293PRJNA239233

REPOSITORIES: GEO, ArrayExpress

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