Cited by 11Probiotics and Fermented FoodsAquaculture disease management and microbiotaGut microbiota and health

Whole genome analysis and in vivo safety assessment of probiotic candidate Lactobacillus acidophilus L177

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Liu, Yunjiang, Zheng, Haohong, Wang, Jiali, Xin, Jialiang, Wu, Ruihu, Zhang, Jingyi, Zhong, Zhijun, Liu, Haifeng +4 more·2025·BMC Microbiology

Abstract

Probiotics, particularly strains of lactic acid bacteria (LAB), are recognized for their beneficial effects on gut health. Lactobacillus acidophilus L177, a promising probiotic strain isolated from canine feces, was evaluated for safety and probiotic properties through whole genome sequencing and a 28-day subacute oral toxicity study in C57BL/6 mice. The toxicity study involved daily administration of L177 at doses of 108, 109, and 1010 CFU/mL, with continuous monitoring of general health, behavioral changes, and physiological parameters. Body weight, food and water intake, hematological and biochemical indices, organ weights, and histopathology were assessed. No significant adverse effects were observed, and proinflammatory cytokines (TNF-α, IL-6, IL-1β) remained undetectable in serum, indicating an absence of inflammatory response. Statistical analysis confirmed no significant differences in key health markers between treated and control groups (p > 0.05). Whole genome sequencing revealed a single chromosome of approximately 1,972,211 base pairs (GC content: 35.02%) with 1 CRISPR sequence and 1,955 genes. Functional annotation highlighted genes associated with metabolism, information processing, and cellular functions. Antibiotic Resistance Gene analysis identified one AMR gene (lnu(C)), but phenotypic tests confirmed L177 is sensitive to clindamycin and lincomycin. Sixty-seven virulence-associated genes were detected, mainly related to structure, metabolism, and regulation. These findings support the safety and probiotic potential of L. acidophilus L177 for potential applications in both animal and human health.

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  • Whole-genome sequencing-based genomic screening allows in silico detection of antibiotic resistance genes, virulence-associated factors, and mobile genetic elements, providing a basis for modern probiotic safety evaluation.

    “Whole-genome sequencing-based genomic screening allows for the in silico detection of antibiotic resistance genes, virulence-associated factors, and mobile genetic elements, thus providing a basis for modern probiotic safety evaluation [20,133,155,156].”

    From Current Concepts in Probiotic Safety and Efficacy (2026) · cites this paper as [155]

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Authors
Liu, Y., Zheng, H., Wang, J., Xin, J., Wu, R., Zhang, J., Zhong, Z., Liu, H., Huang, Y., Fu, H., Zhou, Z., & Peng, G.
Affiliations
Sichuan Agricultural University (CN)
Corresponding author
Peng, Guangneng
Venue
BMC Microbiology
Published
2025-07-02
Volume
25
Issue
1
Pages
398-398
ISSN
1471-2180 (ISSN-L)
OpenAlex
W4411923497
Cited by
9
References
34
Citations by year
2026: 9
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • BMC Microbiology (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
Keywords
probiotic safety, whole genome sequencing, subacute oral toxicity, lactic acid bacteria, inflammatory cytokines, virulence genes, antibiotic resistance genes, gut health
MeSH terms
Whole Genome Sequencing, Animals, Feces, Female, Lactobacillus acidophilus, Male, Mice, Inbred C57BL, Cytokines, Genome, Bacterial, Probiotics, Mice

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