Genomics analysis of Lactobacillus paracasei SLP16

Area of Science:

• Microbiology
• Genomics
• Probiotics

Background:

• Lactic acid bacteria (LAB) are crucial in food and health.
• Understanding probiotic strain safety and functionality is essential for application.
• Lactobacillus paracasei SLP 16 was isolated from a unique source, liquor cellar mud.

Purpose of the Study:

• To perform whole genome sequencing of Lactobacillus paracasei SLP 16.
• To analyze the genetic basis for acid and bile salt tolerance.
• To evaluate the safety of L. paracasei SLP 16 as a probiotic.

Main Methods:

• Genome sequencing using the Illumina Hiseqq platform.
• Bioinformatic analysis including ExPasy and VFDB (Virulence Factor Database).
• Antibiotic sensitivity testing.

Main Results:

• The genome size of L. paracasei SLP 16 is 2.65 Mbp with 46.9% GC content, containing 3131 genes.
• Genes related to acid tolerance (F0F1-ATPase, Na+/H+ antiporter) and bile salt tolerance (F0F1-ATPase, Na+/H+ antiporter) were identified.
• No virulence factor genes associated with toxins were detected; the strain showed resistance to specific antibiotics.

Conclusions:

• L. paracasei SLP 16 possesses genetic determinants for acid and bile salt tolerance.
• The absence of toxin-related virulence genes supports its safety profile.
• L. paracasei SLP 16 is a safe probiotic candidate for various applications.