The effect of fucoidan and inulin on the expression of Lactobacillus plantarum metabolism genes

The most stable reference gene in Lactobacillus plantarum was identified. It was found that the expression of the rpoD gene was most stable with the addition of fucoidan and inulin. The level of expression of the usp gene in L. plantarum bacteria increased by 4 times when fucoidan was added compared to the control sample, but when inulin was added to the culture medium, the expression of this gene decreased by 12 times compared to the control sample. The expression of the opuA gene with the addition of fucoidan increased by 6 times compared to the control sample, and with the addition of inulin decreased by 3 times compared to the control sample. The level of expression of the ATP gene in L. plantarum bacteria with the addition of fucoidan increased by 9 times in comparison with control sample. The expression of the lactate dehydrogenase (ldh) gene with the addition of fucoidan increased by 2 times compared with the control sample, whereas with the addition of inulin it decreased by 18 times compared to control sample. The expression level of the gacT gene with the addition of fucoidan decreased by more than 50 times compared to the control sample, and with the addition of inulin decreased by 12 times compared to the control sample. There were no significant changes in the expression of the GroEL and hsp1 genes. Thus, based on gene expression data, it can be assumed that when fucoidan is added to the culture medium, catabolic processes in L. plantarum bacteria are activated. It was found that the addition of inulin to the culture medium does not lead to an increase in the expression of catabolism genes in L. plantarum.