Project description:In recent years, the scale culture of Chinese soft-shelled turtle has developed rapidly. However, diseases in aquaculture are the main problems affecting the rapid and healthy cultivation. Strengthening the immunity of Chinese soft-shelled turtles is extremely important to control the infection of pathogenic bacteria. Bacillus has attracted attention as a probiotic supplement in aquatic feeds.In our previous studies, we found that the addition of Bacillus subtilis B10 to diets could increase survival rate, daily weight gain (DG) and feed conversion ratio (FCR) of Chinese soft-shelled turtles, improving the activities of digestive enzyme and optimizing the microbial communities of intestinal in Chinese soft-shelled turtle.However, the study on the mechanism of Bacillus subtilis B10 in Chinese soft-shelled turtle culture remains rare. Therefore, in this study, we used Bacillus subtilis B10 to feed the turtle, and used RNA-seq to explore its mechanism.
Project description:Bacillus subtilis strain R0179 is found in a number of commercially-available probiotic products. The mechanism(s) of action of B. subtilis in the host are poorly understood, but may involve the immune system response to switching between spore and vegetative forms. In order to help elucidate this mechanism, we challenged the immune response of a human colonic epithelial HT-29 cell model for 3 hours with the two forms of B. subtilis. The cellular response was evaluated using a custom-designed two-color expression microarray targeting 1354 genes of the human immune system. The data obtained in this study indicates that the vegetative cell form of the strain moderately induced TH1 pro-inflammatory response through IL-17C and TNF signaling pathway while down-regulating anti-inflammatory response genes IL-10 and TGFβ-2. The spore form had an opposite effect and acted primarily by down-regulating the Mitogen-Activated Protein Kinase pathway. The overall design consisted of 2 samples of HT-29 cells treated with Bacillus subtilis R0179 spores or vegetative states versus unchallenged HT-29 cells. A minimum of four dye-swap hybridizations (4 biological replicates) were performed for each of the 2 samples analyzed. Unchallenged HT-29 cells were controls and challenged HT-29 cells with Bacillus subtilis R0179 spores or vegetative were treated samples.
Project description:The aim of this study was to explore whether, and if so, how Bacillus subtilis KC1 can enhance the growth performance of broilers that have been adversely affected by Mycoplasma gallisepticum (MG) infection. A total of 96 1-day-old male broilers were randomly divided into 4 groups: the control group (basal diet), the MG group (basal diet + MG challenge), the Bacillus subtilis KC1 group (basal diet + Bacillus subtilis KC1 supplementation), the Bacillus subtilis KC1 + MG group (basal diet + Bacillus subtilis KC1 supplementation + MG challenge). The trial lasted 42 days, and the results showed that the MG group had significantly reduced body weight and average daily gain, as well as increased feed conversion ratio of broilers, compared to the control group. Dietary supplementation with Bacillus subtilis KC1 significantly improved the growth performance of MG-infected broilers. In addition, dietary supplementation with Bacillus subtilis KC1 significantly improved oxidative stress and inflammatory response markers, characterized by increased superoxide dismutase levels and reduced levels of malondialdehyde, interleukin-1β, and tumor necrosis factor-α. Furthermore, both metabolomics and transcriptomics analyses indicated that MG infection markedly disrupted amino acid metabolism in broilers, whereas Bacillus subtilis KC1 supplementation alleviated the abnormal amino acid metabolism caused by MG infection. These results suggested that Bacillus subtilis KC1 may alleviate the poor growth performance caused by MG infection in broilers by improving amino acid metabolism.
Project description:The transcriptome profiles of a riboflavin-producing recombinant Bacillus subtilis RH33 and wild type Bacillus subtilis 168 were compared using DNA microarrays to identify the target genes for further enhancing riboflavin production.
Project description:The gene expression of Bacillus subtilis 168 showed 3 major patterns including early expression, transition expression and late expression We monitored Bacillus subtilis gene expression by using microarray at differernt time points
Project description:Investigation of the kinetics of whole genome gene expression level changes in Bacillus subtilis NDmed strain during formation of submerged biofilm and pellicle. The Bacillus subtilis NDmed strain analyzed in this study is able to form thick and highly structured submerged biofilms as described in Bridier et al., (2011) The Spatial Architecture of Bacillus subtilis Biofilms Deciphered Using a Surface-Associated Model and In Situ Imaging. PLoS ONE 6(1):e16177.
