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ABSTRACT: Bioaugmentation performance of aerobic denitrifiers

PROVIDER: PRJNA689699 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13357307_1.fastq.gz	Fastqsanger.gz
	SRR13357307_2.fastq.gz	Fastqsanger.gz
	SRR13357308_1.fastq.gz	Fastqsanger.gz
	SRR13357308_2.fastq.gz	Fastqsanger.gz
	SRR13357309_1.fastq.gz	Fastqsanger.gz

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Acute Aerobic Exercise Alters PBMC microRNA Expression: Insights into Sport- and Sex-Specific Variations

Project description:Studying microRNAs in the immune cells of athletes offers a novel perspective on the molecular regulation of immune function and recovery, potentially uncovering strategies to enhance performance and resilience to physical stress. However, PBMC microRNA expression in endurance athletes, such as runners and cyclists, remains underexplored, especially with regard to sex differences. This study aimed to (i) assess sport- and sex-specific differences in PBMC microRNA expression induced by acute aerobic exercise in runners and cyclists, (ii) evaluate the impact of maximal (trial A) and sub-maximal (trial B) exercises, and (iii) examine correlations between PBMC microRNAs and exercise performance. Methods: A total of 58 participants were included: 22 runners (9 females), 18 cyclists (9 females), and 18 active controls (9 females). Participants underwent VO2max and time-to-exhaustion tests, with blood samples collected pre- and post-exercise to analyze PBMC microRNA levels. Results: Runners exhibited a stronger microRNA response than cyclists or controls, with significant sex-based differences. After maximal intensity exercise, 279 microRNAs (255 upregulated) were altered in runners, compared to only 7 microRNAs (none upregulated) in cyclists. Exercise intensity and duration had sport-specific effects on microRNA expression. Time-to-exhaustion in runners and weekly training volume in both groups were significantly associated with changes in PBMC microRNA profiles. Conclusion: This study reveals that PBMC microRNA expression in response to acute aerobic exercise is sport- and sex-specific, providing new insights into the molecular adaptations of endurance athletes and their relationship to athletic performance.

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Competition for electrons favors N2O reduction in denitrifying Bradyrhizobium isolates

Project description:Bradyrhizobia are common members of soil microbiomes and known as N2-fixing symbionts of economically important legumes. Many are also denitrifiers, which can act as sinks or sources for N2O. Inoculation with compatible rhizobia is often needed for optimal N2-fixation, but the choice of inoculant may have consequences for N2O emission. Here, we determined the phylogeny and denitrification capacity of Bradyrhizobium strains, most of them isolated from peanut-nodules. Analyses of genomes and denitrification end-points showed that all were denitrifiers, but only ~1/3 could reduce N2O. The N2O-reducing isolates had strong preference for N2O- over NO3--reduction. Such preference was also observed in a study of other bradyrhizobia and tentatively ascribed to competition between the electron pathways to Nap (periplasmic NO3- reductase) and Nos (N2O reductase). Another possible explanation is lower abundance of Nap than Nos. Here, proteomics revealed that Nap was instead more abundant than Nos, supporting the hypothesis that the electron pathway to Nos outcompetes that to Nap. In contrast, Paracoccus denitrificans, which has membrane-bond NO3- reductase (Nar), reduced N2O and NO3- simultaneously. We propose that the control at the metabolic level, favoring N2O reduction over NO3- reduction, applies also to other denitrifiers carrying Nos and Nap but lacking Nar.

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Project description:Bioaugmentation denitrification

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