Colibactin: More Than a New Bacterial Toxin.

Area of Science:

• Microbiology
• Genetics
• Toxicology

Background:

• Colibactin is a cyclomodulin, a bacterial toxin affecting the eukaryotic cell cycle.
• The pks genomic island synthesizes colibactin, found in Enterobacteriaceae like E. coli and K. pneumoniae.
• Colibactin-producing bacteria are associated with various infections and human diseases.

Purpose of the Study:

• To review the biological effects of colibactin.
• To describe the distribution of the pks island.
• To summarize current knowledge on colibactin synthesis and structure.

Main Methods:

• Literature review of studies on colibactin and the pks island.
• Analysis of bacterial isolation data from various origins.
• Examination of experimental models investigating colibactin's effects.

Main Results:

• Colibactin induces chromosomal instability and DNA damage in eukaryotic cells.
• It leads to epithelial cell senescence and immune cell apoptosis.
• pks E. coli strains are prevalent in colorectal cancer biopsies and increase tumor development in mouse models.

Conclusions:

• Colibactin is a significant virulence factor with potential implications for human health, particularly in colorectal cancer.
• The pks island's distribution and colibactin's biological activities warrant further investigation.
• Understanding colibactin's structure and synthesis is crucial for developing targeted interventions.