AI MICROBIAL GENOMICS LABORATORY

AI Microbial Genomics Laboratory

Department of Biotechnology · Graduate School of Life Sciences, CHA University

We protect human health through microbes. From health across the lifespan to what an ageing society will face — microbial genomics and AI, used together on problems that have stayed unsolved.

Research introduction · From lifting microbes out of a river, to reading them in genome data, and on to human health.

ABOUT THE LAB
Protecting human health through microbes

For many years this laboratory has done the work of finding new microbes in nature and giving them names, isolating bacteria never previously described from rivers, soil, algae, salt lakes and even air conditioning systems.

Alongside that came the study of how microbes signal to one another and live in communities, and of the power microbes have to restore contaminated land.

Artificial intelligence now builds on that foundation. The work of lifting a sample from a riverbank becomes the work of finding it first inside public genome data.

Where it leads is human health. A growing body, a working life and old age each need different things. Addressing the health problems particular to each stage of life through microbes — and preparing answers for what the fastest-ageing society in the world will face — is the direction this laboratory is taking.

Goals
01

Secure safe microbial resources

Find strains that can make what we need without relying on pathogens. The starting point is microbes that people have been consuming safely for centuries.

02

Address the health problems particular to each stage of life

Gout in men in their twenties to forties, bone and vessels after menopause and in later life, muscle loss and resilience in old age — problems that change with the stage of life, each taken on its own terms.

03

Prepare answers for an ageing society

Korea is ageing faster than any country in the world. What is needed now is not treatment after illness arrives but ways of staying well for longer. Microbes may be the key.

04

Change how the search itself is done

Reverse the order: find candidates in public data first, and use the bench to confirm rather than to hunt. Then write the procedure down so that others can use it too.

Strategy
🔎

Data-first discovery

Before any experiment begins, we search the public genomes and the patents. Instead of testing a hundred strains blindly, we obtain five or ten with reasons behind them. The difference in cost and time is an order of magnitude.

🛡️

Safety first

However well a strain performs, it will not reach industry if its safety is hard to prove. So we start from organisms with a record of being eaten, and build regulatory approval and real-world application into the design from the outset.

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Mechanism first

Rather than averaging outcomes, we trace why something happens. Collecting results alone leaves you stuck when reports contradict; understanding the mechanism shows you what to change.

Roadmap
Phase 1Build the search capabilitywithin a year
  • Establish the genome-mining procedure as a pipeline — seeds, search, gene neighbourhood, candidate list
  • Map the prior art and patent landscape for each topic
  • Publish methods and materials as open documents that accumulate as laboratory assets
Phase 2Demonstrateone to two years
  • Obtain candidate strains, including proper positive controls
  • Complete the verification ladder — enzyme-specific digestion through to structural analysis
  • Confirm productivity and safety together in small-scale culture
Phase 3Scale and transfertwo to three years
  • Optimise process conditions and assess scale-up
  • Secure routes to real application through industrial and clinical collaboration
  • Extend the established method to further topics
Expected outcomes
📄

Academic

Papers on the distribution and origin of the genomic island, and a methods paper on the search procedure itself. Correcting the annotation errors in the public databases is a contribution in its own right.

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Resources

Candidate production strains that do not depend on pathogens, together with their characterisation. Strains obtained are deposited so that others can use them.

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Industry

A safe organism means lower verification costs and an opening into food applications. It is the basis for making domestically what is currently imported.

🎓

Training

Students are trained to handle data and the bench together — reading a genome, growing the organism, and confirming it by structure, all within one laboratory.

RESEARCH TOPICS
Six open problems
🔒

The research topics are not public

Six topics are under way. They are still at the stage of shaping ideas and gathering evidence, and stay within the laboratory until that work is done.

PUBLICATIONS
Publications

Grouped by research area. Click any paper to open its topic, methodology and results, each shown with the journal it appeared in.

🔬Discovery of new microbial speciesBacteria isolated from nature and described to science for the first time.10

Amnimonas fluminis sp. nov.Current Microbiology, 76, 2019
TopicA bacterium from a freshwater river matched no existing genus, so we asked whether it warranted a new genus and species.
MethodologyPolyphasic taxonomy — 16S rRNA phylogeny combined with chemotaxonomic and physiological characterisation.
ResultsClearly distinct from known taxa; established as a new species and formally named.
Zavarzinia aquatilis sp. nov.Int. J. Systematic and Evolutionary Microbiology, 69, 2019
TopicWhether a freshwater isolate represented a new species within the genus Zavarzinia.
MethodologyPhylogenetic analysis alongside fatty acid and quinone profiling and physiological comparison.
ResultsDistinguishing characteristics confirmed against close relatives; reported as a new species.
Kaistia algarum sp. nov.Int. J. Systematic and Evolutionary Microbiology, 68, 2018
TopicIdentifying a bacterium living in association with the freshwater alga Paulinella chromatophora.
MethodologyPure isolation from algal culture followed by polyphasic identification.
ResultsConfirmed as a new alga-associated species — material for studying algal–bacterial symbiosis.
Solimonas fluminis sp. nov. · Solitalea longa sp. nov.Int. J. Systematic and Evolutionary Microbiology, 68, 2018
TopicTwo new species from separate lineages, both isolated from the same river sample.
MethodologyPolyphasic identification of each, together with an emended description of the genus Solitalea.
ResultsBoth established as new species, with the genus-level description revised.
Flavobacterium alvei sp. nov. · Siphonobacter curvatus sp. nov.Int. J. Systematic and Evolutionary Microbiology, 68, 2018
TopicSurveying undescribed bacterial diversity in a river environment.
MethodologyCombined morphological, physiological, chemotaxonomic and phylogenetic analysis.
ResultsTwo new species from different phyla reported together.
Paraburkholderia aromaticivorans sp. nov., an aromatic hydrocarbon-degrading bacteriumInt. J. Systematic and Evolutionary Microbiology, 68, 2018
TopicA bacterium able to degrade aromatic hydrocarbons, isolated from gasoline-contaminated soil.
MethodologyEnrichment isolation from contaminated soil, with taxonomic identification and degradation testing in parallel.
ResultsEstablished as a new species and later became the key strain (BN5) for our bioremediation work.
Halomonas tabrizica sp. nov., a moderately halophilic bacterium from Urmia LakeAntonie van Leeuwenhoek, 111, 2018
TopicA bacterium from the hypersaline waters of Lake Urmia in Iran.
MethodologyInternational collaboration applying polyphasic taxonomy with salinity-dependent growth profiling.
ResultsDescribed as a new moderately halophilic species — a case of securing extremophile resources.
Methylobacterium frigidaeris sp. nov. · Roseomonas aeriglobus sp. nov., from an air conditioning systemInt. J. Systematic and Evolutionary Microbiology, 68, 2018
TopicWhether undescribed bacteria live inside the air conditioning systems people use every day.
MethodologyIsolation from air conditioning system samples with polyphasic identification.
ResultsTwo new species reported, showing that everyday indoor spaces hold unexplored microbial resources.
Sphingobium paulinellae sp. nov. · Sphingobium algicola sp. nov.Int. J. Systematic and Evolutionary Microbiology, 67, 2017
TopicDiversity of Sphingobium species living in association with green algae.
MethodologyPhylogenetic and chemotaxonomic comparison of isolates from algal cultures.
ResultsTwo new species identified from a single algal host.
Cohnella algarum sp. nov. · Sphingomonas frigidaeris sp. nov.Int. J. Systematic and Evolutionary Microbiology, 67, 2017
TopicNew species isolated from two very different environments — algae and air conditioning systems.
MethodologyCultivation and isolation from each environment, followed by polyphasic identification.
ResultsTwo new species reported, widening the range of sources surveyed.

🍶Fermentation microbes and healthReading the microbes of long-eaten fermented foods at genome level.1

Phenotypic and Whole-Genome Characterization of Enterococcus Isolates from Korean Doenjang and Meju: E. durans Edu-1 as a Food-Grade Probiotic Candidate with Epithelial Wound-Healing ActivityNEWKang J, Kim H-H, Yoon HM, Choi Y, Heo J, Woo Y, Yu S, Lee K-H, Lee YProbiotics and Antimicrobial Proteins, 2026
TopicWhether Enterococcus isolated from traditional doenjang and meju is safe to eat, examined all the way to the genome.
MethodologyIsolation and phenotypic characterisation, with whole-genome sequencing to screen antibiotic resistance genes and virulence factors alongside.
ResultsThe strain E. durans Edu-1 emerged as a food-grade probiotic candidate, and additionally showed epithelial wound-healing activity.

🧬Bacterial virulence and signallingHow microbes signal to one another, and how they attack a host.6

Pleiotropic effects of N-acylhomoserine lactone synthase ExpI on virulence, competition and transmission in Pectobacterium carotovorumPest Management Science, 80, 2024
TopicWhat else the quorum-sensing system controls, beyond virulence, in a soft-rot plant pathogen.
MethodologyAn expI deletion mutant compared against wild type for virulence, competitive fitness and transmission.
ResultsA single gene governs virulence, competition and transmission together — strengthening its value as a control target.
Disruption of the metC gene affects methionine biosynthesis in Pectobacterium carotovorum and reduces soft-rot diseaseThe Plant Pathology Journal, 39, 2023
TopicHow much a plant pathogen depends on making its own amino acids in order to cause disease.
MethodologyA metC knockout in the methionine biosynthesis pathway, compared for growth and disease severity.
ResultsBlocking methionine synthesis sharply reduced soft rot, suggesting metabolic pathways as control targets.
Pyocyanin and 1-hydroxyphenazine promote anaerobic killing of Pseudomonas aeruginosa via single-electron transfer with ferrous ironMicrobiology Spectrum, 10, 2022
TopicWhether a pigment a bacterium makes itself can, without oxygen, turn against it.
MethodologyTracking the reaction between the pigment and ferrous iron under anaerobic conditions while measuring survival.
ResultsSingle-electron transfer between pigment and iron killed the bacterium itself — a lead for new antibacterial strategies.
Substrate binding protein DppA1 increases biofilm formation in Pseudomonas aeruginosa by inhibiting Pf5 prophage lysisFrontiers in Microbiology, 9, 2018
TopicWhether a virus hidden inside the bacterium takes part in how the cells form a biofilm.
MethodologyModulating DppA1 expression while observing prophage lysis and biofilm formation together.
ResultsIdentified a route by which the protein suppresses prophage lysis and thereby increases biofilm.
Tolerance to oxidative stress is required for maximal xylem colonization by Xylella fastidiosaMolecular Plant Pathology, 18, 2017
TopicHow a pathogen withstands the oxidative stress a plant releases to stop it.
MethodologyMutants altered in oxidative stress tolerance, compared for the extent of xylem colonisation.
ResultsTolerance proved to be a prerequisite for colonisation.
ATP-dependent RecG helicase is required for OxyR function in Pseudomonas speciesJournal of Biological Chemistry, 287, 2012
TopicHow a DNA-handling enzyme connects to the switch that answers oxidative stress.
MethodologyGene deletion combined with protein interaction analysis.
ResultsRecG helicase shown to be indispensable for OxyR function.

🌊Microbial communities and ecologyHow microbial communities reshape an environment and sustain one another.4

Soil pH and rice chlorophyll content as indicators of grain productivity and microbial communityNEWBull. Environmental Contamination and Toxicology, 114, 2025
TopicWhether soil acidity governs both rice productivity and the microbial community in the soil.
MethodologyMeasuring paddy soil pH and rice chlorophyll content alongside analysis of community structure.
ResultsTwo simple indicators proved sufficient to gauge productivity and community together.
The self-bleaching process of Microcystis aeruginosa is delayed by a symbiotic bacterium and promoted by methionine deficiencyMicrobiology Spectrum, 10, 2022
TopicWhether a companion bacterium slows the collapse of the cyanobacterium that causes algal blooms.
MethodologyTracking bleaching under combinations of bacterial presence and methionine deficiency.
ResultsThe bacterium delayed collapse while methionine deficiency accelerated it — a new lever for bloom control.
Linkage between bacterial community-mediated hydrogen peroxide detoxification and the growth of Microcystis aeruginosaWater Research, 207, 2021
TopicWhether a bloom-forming cyanobacterium survives hydrogen peroxide by itself or through neighbouring bacteria.
MethodologyManipulating the bacterial community while measuring peroxide breakdown and cyanobacterial growth.
ResultsDetoxification by neighbours underpinned growth — the reason bloom control must consider the whole community.
Metabolic and stress responses of Acinetobacter oleivorans DR1 during long-chain alkane degradationMicrobial Biotechnology, 10, 2017
TopicWhat metabolic and stress burden an oil-degrading bacterium carries while doing the work.
MethodologyTracking metabolic shifts and stress responses under long-chain alkane degradation.
ResultsDegradation capacity and stress handling proved intertwined — a lead for improving remediation efficiency.

🌱Bioremediation and biodegradationUsing the power of microbes to restore contaminated soil and water.3

Biodegradation of naphthalene, BTEX and aliphatic hydrocarbons by Paraburkholderia aromaticivorans BN5Scientific Reports, 9, 2019
TopicHow far the new species we had isolated could actually degrade real pollutants.
MethodologyTesting naphthalene, BTEX and aliphatic hydrocarbons as substrates, with pathway analysis.
ResultsBroad degradation across several classes of petroleum pollutant, indicating field potential.
Construction and evaluation of a Korean native microbial consortium for bioremediation of diesel-contaminated soilFrontiers in Microbiology, 9, 2018
TopicWhether diesel contamination could be cleaned using only microbes native to Korean soil.
MethodologyBuilding a consortium from domestic isolates and evaluating its efficiency in contaminated soil.
ResultsEffective remediation using native microbes alone, avoiding concerns about introducing foreign organisms.
Effects of non-ionic solute stresses on biofilm formation and lipopolysaccharide production in Escherichia coli O157:H7Research in Microbiology, 163, 2012
TopicHow a foodborne pathogen shifts its survival strategy in response to osmotic stress.
MethodologyApplying non-ionic solute stress and measuring biofilm formation and lipopolysaccharide production.
ResultsStress altered both biofilm and surface structure — directly relevant to food hygiene control.
TEAM
The team

Microbiology and artificial intelligence, used together for human health.

Principal Investigator
Prof. Yunho Lee
Food Microbiology and Bacterial Genetics · CHA University
yunho.lee@cha.ac.kr
Master’s student · 1
Undergraduate researcher · 2
In collaboration with AIForA Lab (Department of AI Healthcare Convergence, Prof. Daekeun Park) — AI methodology
GUIDES
Guides

Reference documents for getting started. Each one can be read directly in the browser, and is also available to download as a PDF file.

GUIDE 01
NCBI account and API key
What you need before using the genetic databases, from creating an account through to keeping your key safe.
Read the guide →
GUIDE 02
Genome mining with GenBank
A step-by-step procedure for finding bacteria that carry the gene you are looking for, using public genome data.
Read the guide →
GUIDE 03
Building a research portal
How to publish your own pages in the laboratory web space, from uploading files through to using the database.
Read the guide →
GUIDE 04
Maintaining this portal
How the team edits and extends this portal. It is built so that the Korean and English sites always change together.
Read the guide →
RESEARCH TOOLS
Research tools

Tools running on the laboratory server, ready to use. All four are reached with the same account.

💬ChatLaboratory AI assistant · sign in with your email address📓JupyterPython analysis notebooks, with GPU available📊RStudioR environment for statistical analysis🗄️MySQLDatabase, with a dedicated schema for each account