Iterative Strain Enhancement

Strain Directed Evolution Service

Break the performance ceiling of a proven producer — evolve enzymes, pathways, and whole genomes through iterative cycles of diversification, selection, and recombination. Part of our Microbial Strain Engineering & Fermentation Optimization Platform.

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10+ rounds

iterative evolution

4 modules

protein · pathway · genome · ultra-HT

10⁹ variants/day

genome-scale throughput

Schematic of the Strain Directed Evolution workflow spanning protein/gene, pathway/regulatory, genome-scale, and ultra-high-throughput enzyme evolution converging into an improved production strain.

Protein → Genome

one evolution engine

Diversify, select, recombine — repeated until the trait is reached

Resolution matched to goal from a single active site to the genome

Screening-ready for direct handoff

Overview

Evolve Performance Into The Strain

Every industrial strain eventually hits a ceiling. Directed evolution is how you push past it — without needing a full mechanistic model first.

Industrial strain development rarely ends at the first improvement. Creative BioMart Microbe delivers a Strain Directed Evolution service that repeatedly cycles through diversification, screening, and recombination to push a proven producer past its natural limits — improving enzymes, pathways, and whole genomes on a compressed laboratory timescale.

We operate across four resolution tiers. Protein/gene directed evolution reshapes individual enzymes through error-prone PCR, DNA shuffling, and iterative saturation mutagenesis. Pathway & regulatory evolution optimizes flux and control using biosensor-coupled evolution, CRISPR-assisted pathway evolution, and riboswitch engineering. Genome-scale strain evolution rewires entire chromosomes via genome shuffling, global transcription machinery engineering, multiplex automated genome engineering, and base/prime editing. Ultra-high-throughput enzyme evolution couples droplet microfluidics with genetically encoded biosensors and structure-guided design for accelerated, multi-round improvement.

Evolved strains are formatted for immediate handoff to our High-Throughput Screening Service and downstream Adaptive Laboratory Evolution, so iterative in-lab evolution and continuous culture evolution can be combined into one development path.

Our integrated pipeline spans gene to genome, preserving the selected phenotype from the first round of diversification through scale-up fermentation and release.

Services

A Six-Step Path From Inquiry To Evolved Strain

Each project follows a six-step workflow from initial consultation to documented delivery, with the evolution tier and selection pressure selected to match your objective.

Project Consultation

Trait & selection review

Construct & Diversify

Mutagenesis / recombination

Screen & Select

Assay / biosensor

Isolate & Sequence

Validate the hit

Iterative Rounds

Recombine & repeat

Delivery

Stocks + QC report

Service Modules

Each module trades mechanism-free breadth for targeted precision — many programs chain protein evolution into pathway and genome-scale refinement. Pick the resolution that matches your starting point and goal.

Illustration of protein and gene directed evolution with error-prone PCR and DNA shuffling reshaping an enzyme.

Protein / Gene Directed Evolution

We evolve individual enzymes and genes through error-prone PCR, DNA shuffling and family shuffling, site saturation and combinatorial mutagenesis, and iterative saturation mutagenesis recombined with DNA reassembly. Best for: enzyme activity, thermostability, and substrate specificity.

Illustration of pathway and regulatory evolution using biosensors and CRISPR-assisted engineering of a metabolic pathway.

Pathway & Regulatory Evolution

We optimize metabolic flux and control through biosensor-coupled evolution, CRISPR-assisted pathway engineering, riboswitch and aptamer tuning, and genetically encoded reporter readouts for activity and transcription. Best for: pathway balancing and regulatory tuning.

Genome-Scale Strain Evolution

We rewire entire chromosomes using genome shuffling, global transcription machinery engineering, multiplex automated genome engineering, and CRISPR base editing. Genome-wide screening and droplet-based selection are available for compatible hosts. Best for: complex polygenic traits and robustness.

Ultra-High-Throughput Enzyme Evolution

We accelerate enzyme optimization with droplet microfluidics-based biosensor-assisted evolution, multi-round iterative droplet sorting guided by next-generation sequencing, and structure-guided rational design combined with directed evolution. Best for: rapid enzyme improvement at million-clone scale.

Technique Coverage Matrix

Module	Technique	Representative Hosts / Target	Deliverable
Protein / Gene	Error-prone PCR, DNA shuffling / family shuffling, site saturation, combinatorial, iterative saturation + DNA reassembly	Bacteria, yeast, fungi (plasmid / gene)	Evolved enzyme / variant library
Pathway / Regulatory	Biosensor-coupled evolution, CRISPR-assisted pathway engineering, riboswitch / aptamer tuning, genetically encoded reporter readouts	Bacteria, yeast	Optimized pathway / regulatory strain
Genome-Scale	Genome shuffling, gTME, MAGE, CRISPR base editing; optional genome-wide screening	Bacteria, yeast	Evolved whole-cell strain
Ultra-HT Enzyme	Droplet microfluidics biosensor-assisted evolution, multi-round sorting + NGS, structure-guided design + directed evolution	Bacteria, yeast, cell-free	Evolved enzyme (high throughput)

Service Specifications & QC Standards

01 · Instrumentation & Capability

Error-prone PCR, DNA shuffling, and saturation / combinatorial mutagenesis platforms.
Genome-scale toolkits: genome shuffling, gTME, MAGE, and base / prime editing.
Biosensor, FRET, and molecular-beacon readouts for in vivo activity monitoring.
Droplet microfluidics and fluorescence-activated sorting for million-clone selection.
Compatibility with bacteria, yeast, and fungi across common production hosts.
Optional whole-genome or amplicon sequencing of selected clones.
Direct handoff formatting for high-throughput screening and adaptive evolution.

02 · Typical Data Range

Iterative cycles / project	3–10 rounds
Enzyme improvement (directional)	Activity, stability, or specificity gains (project-dependent)
Genome-scale diversity	High-combinatorial libraries via MAGE, gTME, or shuffling
Host coverage	Bacteria, yeast, fungi
Selection modality	Biosensor / FRET / droplet / plate

03 · Deliverables

Evolved strain	Glycerol stocks / plasmid / clone
QC report	Phenotype, stability, sequence
Sequence data	Optional WGS of clones; NGS of pools
Documentation	Method, rounds, construct lists

Sample Requirements

What To Send Us

To initiate a Strain Directed Evolution project, please provide the following information about your starting material, target trait, and selection strategy.

Required	Optional	Not Accepted
Pure, axenic starting culture, plasmid, or validated gene Strain name and taxonomic identification (or sequence for targeted work) Biosafety classification (e.g., BSL-1) and known sensitivities Target trait and selection direction (activity, titer, tolerance) Available assay or biosensor for the screening readout	Prior evolution or screening history Desired improvement and number of rounds Preferred preservation format Structural model or target residue list (enzyme work) Known off-target or fitness constraints	Contaminated or mixed cultures Uncharacterized pathogens (BSL-2 or above without clearance) Strains under material transfer or export restrictions Non-viable or heavily lysed samples

Recommended Starting Material By Scope

Single enzyme / gene	Plasmid or purified gene + sequence file
Pathway strain	Plasmid set / genomic DNA / target locus
Genome-scale	Agar slant or glycerol vial plus backup
Multi-round program	2–3 glycerol vials with documented history

Storage & Shipping: Ship cultures on dry ice for glycerol stocks or as stabilized agar slants at ambient temperature with cushioning. Avoid temperature excursions and do not ship under conditions that cause complete lysis. For gene and plasmid work, ship dry DNA with a documented sequence file. Contact our team via the contact form before dispatch for biosafety clearance.

Advantages

Why Teams Evolve Strains With Us

Resolution Matched To Goal

Confine diversity to a single active site when the target is known, or scale to the entire genome for complex, polygenic traits.

Mechanism-Free Improvement

Evolution finds solutions that rational design cannot — no structural model or mechanistic hypothesis is required to begin.

Multi-Scale Coverage

One platform spans protein, pathway, and genome-scale evolution, so a program can move from enzyme to strain without changing vendors.

Biosensor & Droplet Acceleration

Genetically encoded biosensors and droplet microfluidics compress each screening round from weeks to days at million-clone scale.

Recombination Escapes Local Optima

DNA shuffling, genome shuffling, and MAGE recombine beneficial mutations from multiple parents, moving past fitness valleys.

Seamless Screening & ALE Handoff

Evolved strains are formatted for direct handoff to our high-throughput screening and adaptive laboratory evolution services.

Customer Reviews

Trusted by Research Teams Worldwide

"The iterative saturation mutagenesis campaign improved our enzyme's catalytic efficiency by more than an order of magnitude, and the sequence-validation report made the downstream cloning completely straightforward."

Dr. K. A.

Enzymologist

USA

"Genome shuffling took our low-yielding producer to nearly four times the original titer. The recombinant strain was genetically stable across scale-up, which gave our fermentation team immediate confidence."

Dr. M. T.

Metabolic Engineer

USA

"Coupling biosensor readouts with droplet sorting let us run multiple evolution rounds in the time a single plate screen used to take. We reached the target specificity far faster than expected."

Dr. L. F.

Synthetic Biologist

USA

"We started with a single enzyme and extended the program to pathway and genome-scale evolution without switching providers. The documentation traveled cleanly between every phase."

Dr. R. O.

Research Director

USA

"The MAGE-based genome engineering delivered the combinatorial diversity we needed for a complex trait, and the optional whole-genome sequencing clarified exactly which edits had accumulated."

Dr. S. M.

Systems Biologist

Germany

"Handoff from directed evolution into adaptive laboratory evolution was seamless. The evolved clone entered continuous culture already formatted for our stress-gradient selection."

Dr. P. R.

Biotechnology Consultant

Germany

Applications

Where Directed Evolution Creates Value

Illustration representing industrial enzyme evolution.

Industrial Enzymes

Activity, thermostability, pH

Illustration representing biochemical and metabolite production.

Biochemicals & Metabolites

Titer, yield, precursor use

Illustration representing biofuel production.

Biofuels

Substrate tolerance, yield

Illustration representing pharmaceutical protein production.

Pharmaceutical Proteins

Expression, folding

Probiotics

Stability, digestive enzymes

Illustration representing stress-tolerant production strains.

Stress-Tolerant Strains

Heat, osmotic, solvent

Case Study

Proven Across Protein And Genome Scales

Protein / Gene Directed Evolution: A Thermostable PET Hydrolase Engineered for Industrial Depolymerization

A thermostable PET hydrolase, TurboPETase, was engineered from the bacterium HR29 BhrPETase through a hybrid computational strategy. A Transformer language model predicted beneficial mutations at the PET-binding groove, while the GRAPE strategy introduced compensatory stabilizing mutations to buffer destabilizing active-site substitutions. The final variant carried eight mutations and exhibited a 3.4-fold improvement in PET-specific activity with a melting temperature of 84°C. At an industrially relevant solids loading of 200 g kg−1 and 65°C, TurboPETase accomplished nearly complete depolymerization of postconsumer PET bottles within 8 h, achieving a maximum production rate of 61.3 g hydrolyzed PET L−1 h−1. The performance was further validated in a 7.5 L bioreactor, demonstrating the industrial scalability of the evolved enzyme.

Depolymerization of pretreated postconsumer PET with TurboPETase and LCCICCG in bioreactors at industrially relevant high-solids loading. — Figure 1. Depolymerization of pretreated postconsumer PET (PcPET) with TurboPETase and LCC^ICCG in bioreactors. (Cui, *et al.*, 2024)

Genome-Scale Strain Evolution: Whole-Genome SCRaMbLE Of Saccharomyces cerevisiae For Stress Tolerance

A yeast strain with 83 loxPsym sites distributed across all 16 chromosomes was constructed using CRISPR/Cas9. Upon Cre recombinase induction, SCRaMbLE produced versatile genome-wide rearrangements dominated by inter-chromosomal events. Screening under nocodazole stress identified a tolerant clone carrying a chrIV/chrXIV translocation and a 484 kb duplication on chrIV. Whole-genome Nanopore sequencing, Hi-C, and RNA-seq analysis revealed that these large-scale rearrangements perturbed the 3D genome structure and transcriptome, with 197 differentially expressed genes clustered around rearrangement sites. A split-URA3 reconstruction strategy directly validated that the chrIV/chrXIV translocation alone conferred nocodazole tolerance. When combined with a synthetic chromosome in heterozygous diploids, three rounds of SCRaMbLE-selection evolution rapidly enhanced acetic acid tolerance beyond wild-type levels.

Figure 2. Genome-wide rearrangements confer resistance to various stresses. (Cheng, *et al*., 2024)

Pair With High-Throughput Screening

Evolved strains are immediately compatible with our screening service for rapid hit identification, with optional micro-droplet single-cell resolution.

Explore Screening →

FAQs

Common Questions

Q: What is the difference between directed evolution and adaptive laboratory evolution?

Directed evolution acts in the laboratory through deliberate diversification and screening of genes, pathways, or genomes — often in discrete rounds. Adaptive laboratory evolution applies continuous selection pressure in culture over many generations. The two are complementary: evolved clones from directed evolution can be handed off to adaptive evolution for further robustness.

Q: Which evolution tier should I choose for my project?

Choose protein/gene evolution for a single enzyme with a defined activity, pathway/regulatory evolution for flux or control, genome-scale evolution for complex polygenic traits such as tolerance or yield, and ultra-high-throughput enzyme evolution when millions of variants must be screened per round. Many programs chain tiers.

Q: Do I need a structural model or known mechanism to start?

No. A central advantage of directed evolution is that it improves function without requiring a structural or mechanistic hypothesis. If you do have a model or residue list, we can focus diversity with saturation or combinatorial mutagenesis to accelerate the campaign.

Q: How many evolution rounds are typical, and how long does a project take?

Programs commonly run 3–10 rounds. Biosensor and droplet-microfluidics readouts compress each round from weeks to days, while genome-scale recombination can reach large combinatorial diversity within a few cycles. Timeline is confirmed during consultation based on the selection strategy.

Q: What organisms are compatible with genome-scale methods such as MAGE and genome shuffling?

Genome shuffling is applied across bacteria and yeast via recursive protoplast fusion or mating, while MAGE and base/prime editing are best established in bacteria and yeast. Host suitability and the best recombination route are confirmed during consultation.

Q: Do you provide sequencing to characterize the evolved changes?

Optional whole-genome sequencing of selected clones and amplicon or pooled-next-generation sequencing of libraries are offered to identify accumulated mutations, confirm stability, and support follow-on engineering or fermentation.

Q: Can the evolved strain be paired with your screening or adaptive evolution services?

Yes. Evolved strains are formatted for direct handoff to our High-Throughput Screening Service and Adaptive Laboratory Evolution service, enabling continuous improvement from single-round evolution into culture-scale robustness.

Ready To Evolve Your Strain?

Tell us your starting material and target trait—our team will select the evolution tier and design the screening handoff.

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Explore The Strain Engineering Platform

Mutant Library Construction

Diversity generation

High-Throughput Screening

Million-scale discovery

Strain Directed Evolution

Iterative enhancement

Adaptive Laboratory Evolution

Industrial robustness

View the full platform →

References:

Cui, Y., et al. (2024). Computational redesign of a hydrolase for nearly complete PET depolymerization at industrially relevant high-solids loading. Nature Communications, 15, 1417.
Cheng, L., et al. (2024). Large-scale genomic rearrangements boost SCRaMbLE in Saccharomyces cerevisiae. Nature Communications, 15, 770.

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