Synthetic Biology

Overview

Engineering Biology through Design, Assembly, and Cellular Control

Synthetic biology applies engineering principles to design, construct, and reprogram biological parts, genetic circuits, and cellular systems. By combining molecular biology with quantitative modeling, it enables the creation of novel biological functions for medicine, sustainable biomanufacturing, and environmental sensing.

In this program, students navigate the complete Design-Build-Test-Learn (DBTL) cycle using modular cloning techniques, genetic circuit modeling, and bio-characterization. Through hands-on experimentation and quantitative analysis, participants build practical expertise in synthetic gene regulation, metabolic engineering, and translational biotechnology R&D.

Selected Topics

Modular DNA Assembly & Standardization

Explores standardized cloning strategies, including Gibson Assembly and Golden Gate MoClo, to seamlessly construct multi-gene synthetic constructs.

Genetic Logic Gates & Circuit Architecture

Investigates the design of transcriptional AND/OR/NOT logic gates, repressilators, and inducible switch systems to program complex cellular behaviors.

CRISPR-based Transcriptional Control (CRISPRi/a)

Uses dCas9-based systems, with guide RNA targeting and optional transcriptional effector domains, for targeted and multiplexed activation or repression of gene expression.

Cell-Free Protein Synthesis (TX-TL) Systems

Utilizes in vitro cell-free transcription-translation reaction mixtures for rapid, cell-free prototyping and characterization of genetic circuits.

Metabolic Pathway Engineering & Cell Factories

Programs heterologous biosynthetic pathways in microbial host chassis to optimize precursor flux and biomanufacture high-value chemicals.

Engineered Biosensors & Cellular Actuators

Constructs riboswitches and allosteric transcription factor biosensors capable of detecting environmental signals or intracellular metabolites.

Sample Project Design

Design, Construction, and Characterization of Synthetic Gene Circuits

In this project, students design, assemble, and characterize a bistable genetic toggle switch in E. coli, implementing modular cloning protocols and quantitative fluorescence analysis.

Research Question

How can synthetic transcriptional feedback loops be engineered to achieve switchable, memory-capable cellular state transitions?

Synthetic Gene Circuit Design Experiment

Laboratory & Engineering Activities

Students execute hands-on molecular assembly and characterization protocols, including:

Designing genetic circuit architecture and promoter-repressor parts using bio-CAD software.
Assembling promoter, RBS, repressor, and fluorescent reporter modules via Golden Gate cloning.
Transforming assembled plasmid constructs into competent bacterial host chassis.
Inducing circuit state switching using specific chemical inputs (e.g., IPTG and aTc).
Measuring dynamic GFP and mCherry reporter expression via plate reader fluorometry and flow cytometry.
Quantifying circuit bistability, hysteresis curves, and switching kinetics across inducer concentrations.

Data Analysis & Evaluation

Transforming experimental measurements into quantitative engineering insights:

Quantitative Response Fitting Students fit fluorescence response curves to Hill equations to estimate half-maximal response parameters and apparent Hill coefficients.

Bistability & Memory Verification Participants evaluate single-cell fluorescence distributions and state persistence following inducer removal to assess memory retention across cellular generations.

Circuit Debugging & Load Assessment Students analyze promoter leakiness and evaluate host cell metabolic burden caused by synthetic gene expression.

Industry Context & Translational Research

Engineered gene circuits and synthetic genetic switches form the foundational technology for next-generation smart therapeutics, cell therapies, and biomanufacturing biofoundries.

Smart Therapeutics Engineering living cell therapies that sense disease microenvironments and deliver targeted therapeutic responses.

Biomanufacturing Cell Factories Programming microbial strains for high-yield biosynthesis of green chemicals, enzymes, and biopharmaceuticals.

Environmental Biosensing Deploying biocontained cell-based or cell-free sensors to detect environmental toxins and heavy metals.

Agricultural Biotechnology Engineering nitrogen-fixing microbes and synthetic traits to enhance crop resilience against climate stress.

Possible Project Outputs

Depending on individual progress, deliverables may include:

Verified plasmid constructs and annotated GenBank file maps
Quantitative fluorescence switching and hysteresis datasets
Comprehensive experimental laboratory notebook and protocol documentation
Formal technical manuscript formatted for synthetic biology journals
Academic research poster detailing circuit architecture and performance

Experimental Translation

Synthetic biology builds actionable bioproducts. Through mentor discussions, participants examine:

How DBTL (Design-Build-Test-Learn) workflows accelerate product development in bio-startups.
How biosafety controls, genetic kill-switches, and biosecurity regulations safeguard engineered strains.
How automated biofoundries and AI-driven sequence generators reshape biological engineering.

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Antibody Engineering Computational Biology Bioinformatics Immunology Protein Engineering Genetic Engineering Foundational Biology Glycobiology Chemical Engineering Aging Biology