Kimchi Probiotics Remodel Gene Expression to Adapt to Gut Environment

A study has found that kimchi’s lactic acid bacteria adapt within the gut by altering their gene expression. Provided by Getty Images Bank.

The mechanism by which kimchi aids gut health has been partially identified. South Korean researchers have released findings showing that lactic acid bacteria, after entering the gut, reconfigure themselves to suit the environment by altering their gene expression. 

The World Institute of Kimchi announced on the 6th that a team led by Dr. Won Tae-woong, Head of the Intelligent Fermentation Research Group, in collaboration with Professor Lee Do-yeop of Seoul National University, has uncovered the adaptation mechanism of kimchi’s lactic acid bacteria for the first time. The study’s results were published in the international academic journal ‘Food Research International’.

While it was known that kimchi’s lactic acid bacteria are beneficial to gut health, the specific mechanism of their adaptation within the gut had remained unknown. This research is notable for experimentally demonstrating that these bacteria do not simply migrate but systematically reprogram their entire gene expression patterns when their environment changes.

The research team created a ‘germ-free kimchi-germ-free mouse integrated model’ to eliminate external microbes and precisely compared the changes in gene expression of the same kimchi lactic acid bacteria when applied to both the kimchi and gut environments.
  
The analysis confirmed that kimchi’s lactic acid bacteria change their survival strategies and functions based on ‘transcriptional flexibility,’ selectively regulating necessary genes in response to environmental changes.

In the kimchi environment, to withstand acidic conditions and oxidative stress, metabolic pathways for producing vitamins and amino acids became more active to maintain fermentation functions. 

In contrast, inside the gut, the activity of genes related to sugar metabolism increased to efficiently use nutrients consumed by the host, and the expression of genes related to cell wall structure and adhesion was strengthened for stable attachment to the gut lining.

Dr. Won Tae-woong stated, “The fact that kimchi’s lactic acid bacteria reconfigure themselves to suit the gut environment is a key piece of scientific evidence supporting that kimchi is a ‘living, highly functional food.'” He added, “We will continue to enhance the precision of functional lactic acid bacteria development and further strengthen the scientific foundation of the kimchi industry.”

Dr. Won Tae-woong’s research team at the World Institute of Kimchi’s Intelligent Fermentation Research Group. Provided by the World Institute of Kimchi.

doi.org/10.1016/j.foodres.2026.119034