Functional Gene Expression in Shark Bay Hypersaline Microbial Mats: Adaptive Responses.

摘要: Microbial mat communities possess extensive taxonomic and functional diversity, which drive high metabolic rates rapid cycling of major elements. Modern microbial mats occurring in hypersaline environments are considered as analogs to extinct geobiological formations dating back ∼ 3.5 Gyr ago. Despite efforts understand the diversity potential Shark Bay, Western Australia, there has yet be molecular analyses at transcriptional level these communities. In this study, we generated metatranscriptomes for first time from actively growing comparing type mat, well influence diel seasonal cycles. We observed that overall gene transcription is strongly influenced by community structure seasonality. The most transcribed genes were associated with tackling low nutrient conditions uptake fatty acids, phosphorus, iron, nickel environment protective mechanisms against elevated salinity prevent build-up ammonium produced nitrate reducing microorganisms. A range pathways involved carbon, nitrogen, sulfur cycles identified metatranscriptomes, anoxygenic photosynthesis chemoautotrophy using Arnon-Buchanan cycle inferred carbon cycle. Furthermore, enrichment active anaerobic (e.g., sulfate reduction, methanogenesis, Wood-Ljungdahl) smooth corroborates previous metagenomic studies further advocates modern ancient microbialites.