ArticleVeterinary research communications2024
Biological characterization of lipoic acid- and heme-dependent Escherichia coli small colony variants isolated from sheep in Xinjiang, China.
Article in Veterinary research communications, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- D-amino acids inhibit biofilm formation in Escherichia coli and increase antibiotic susceptibility in multidrug-resistant bacteria.Folia microbiologica · 2026Article
- Study on drug resistance, biofilm formation, phylogenetic and virulence gene analysis of Escherichia coli from diarrheic lambs.BMC veterinary research · 2026Article
- Cysteine enhances oxidative stress of heme-dependent Escherichia coli small colony variants in dairy cows with mastitis.Veterinary research communications · 2025Article
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Authors and funding
3 authors.
Funding
Abstract
Escherichia coli (E. coli) small colony variants (SCVs) have garnered attention due to their heightened antibiotic resistance and enhanced cell retention, posing significant risks to public health and food safety. However, understanding of SCVs derived from sheep remains limited. This study aimed to detect the biological characterization of sheep-derived E. coli SCVs and investigate the factors contributing to SCV development with preliminary genomic data. In this study, a lipoic acid-dependent SCV (LA-SCV) and a wild-type (WT) strain were isolated from sheep bile. Then, a heme-dependent SCV (HD-SCV) was induced from WT using amikacin. Initially, we examined factors contributing to SCV formation via comparative genomics. Subsequent comparisons between WT and two SCV strains encompassed antibiotic resistance, hemolytic activity, biofilm formation, motility, and metabolism. Genomic analyses identified a frameshift deletion mutation in the lipA gene in LA-SCV and a stopgain mutation in the hemG gene in HD-SCV, hypothesized as potential triggers for lipoic acid- and heme-dependent SCV development, respectively. Physiological, biochemical, and cultural traits exhibited notable differences between WT and SCVs, including increased antibiotic resistance, hemolytic activity, and biofilm formation, but alongside non-fermentative acetate utilization, slow growth, reduced intracellular ATP, and decreased motility (P < 0.01). The energy and amino acid metabolism were suppressed during the logarithmic phase in LA-SCV, while both logarithmic and stable phases in HD-SCV. These alterations in biological characteristics present significant challenges in managing E. coli pathogenicity and antibiotic resistance.
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