Project Title Genetic Design of a Silk-Inspired Protein Module for Future Rehabilitation Biomaterials
SECTION 1: ABSTRACT This project addresses a key challenge in wearable rehabilitation and soft robotics: many assistive devices still rely on rigid or non-biological materials that can limit comfort, adaptability, and integration with the body. Soft robotic systems offer a promising alternative, but there is still a gap in how biological material principles can be translated into programmable and manufacturable biomaterials for future wearable actuation. The overall objective of this project is to design and assemble a DNA construct encoding a protein-inspired material building block based on motifs from Bombyx mori silk fibroin and elastic protein domains, as a first step toward engineered biomaterials for soft rehabilitation devices.
Genetic Design of a Silk-Inspired Protein Module for Future Rehabilitation Biomaterials
SECTION 1: ABSTRACT
This project addresses a key challenge in wearable rehabilitation and soft robotics: many assistive devices still rely on rigid or non-biological materials that can limit comfort, adaptability, and integration with the body. Soft robotic systems offer a promising alternative, but there is still a gap in how biological material principles can be translated into programmable and manufacturable biomaterials for future wearable actuation. The overall objective of this project is to design and assemble a DNA construct encoding a protein-inspired material building block based on motifs from Bombyx mori silk fibroin and elastic protein domains, as a first step toward engineered biomaterials for soft rehabilitation devices.
The central hypothesis is that a genetically encoded silk-inspired or silk-elastin-like protein sequence can serve as a rational platform for future bio-derived films, fibers, or coatings with useful mechanical properties such as flexibility, resilience, and hierarchical assembly. To test this idea, the project will complete sequence design, codon optimization, plasmid planning, overlap design, Gibson Assembly, bacterial transformation, and clone validation. Methods include Benchling-based DNA design, PCR amplification, Gibson Assembly, E. coli transformation, colony screening, and sequence verification.
The expected outcome is a validated recombinant DNA construct that demonstrates the feasibility of integrating synthetic biology and protein design into a material-centered design workflow for future soft robotic textile applications. This project therefore functions as an enabling step between biomolecular design and the long-term development of adaptive rehabilitation wearables.
SECTION 2: PROJECT AIMS
Aim 1: Experimental Aim
The first aim of my final project is to design, assemble, and validate a recombinant DNA construct encoding a silk-inspired or silk-elastin-like protein module by utilizing Benchling for sequence design, codon optimization, PCR, Gibson Assembly, bacterial transformation, and colony validation workflows. This aim focuses on creating a feasible genetic starting point for future biomaterial development and demonstrates how DNA design can be incorporated into a design research process for rehabilitation-oriented material systems.
Aim 2: Development Aim
The second aim of the project is to express and characterize the engineered protein material after successful plasmid validation, including small-scale protein production, purification, and exploratory material formation into films, coatings, or fibers. A successful Aim 1 would enable the next stage of testing whether the designed sequence shows desirable material behaviors such as film formation, flexibility, and compatibility with textile substrates.
Aim 3: Visionary Aim
The third aim of the project is to contribute to a long-term vision in which genetically designed protein materials become programmable components of wearable soft robotic systems for rehabilitation. If fully realized, this concept could support a new class of biomaterial-based soft actuators or structural interfaces that are lighter, more adaptive, and more biologically integrated than many current rehabilitation devices.
SECTION 3: BACKGROUND
Background and Literature Context
Soft robotics for rehabilitation is a rapidly growing field because soft devices can better conform to the body and reduce joint misalignment compared with rigid systems. Textile-based and soft actuator approaches are especially promising because they offer comfort, safety, and better integration into everyday life. However, important material challenges remain, including durability, controllability, biocompatibility, and the ability to closely adapt to the body while maintaining function.
At the same time, silk fibroin is highly relevant for biomaterial design because it combines strength, flexibility, hierarchical organization, and biocompatibility. Silk-inspired materials have strong potential for biomedical engineering and wearable systems. Synthetic biology methods such as Gibson Assembly also provide a practical way to construct recombinant sequences that encode designed protein materials. Despite progress in soft robotics and silk-based biomaterials, the integration of DNA-level protein design into rehabilitation-oriented material design is still underexplored. This project addresses that gap by positioning genetic design as the starting point of a future material system for wearable rehabilitation.
Two Peer-Reviewed Research Citations Relevant to the Project
Citation 1: Sanchez, V., Walsh, C. J., and Wood, R. J. Textile Technology for Soft Robotic and Autonomous Garments (2021).
This paper reviews how textile structures can function as robotic substrates rather than passive coverings. It shows that knitting, weaving, multilayer structures, and fiber orientation can contribute directly to sensing, actuation, and body-conforming performance in soft robotic garments. For this project, the paper is important because it supports the idea that future rehabilitation systems can benefit from material architectures inspired by biological systems, especially when movement and compliance are designed into the textile itself. It also helps justify why a biomaterial building-block approach could eventually feed into wearable actuator design rather than remaining purely molecular.
Citation 2: Recent review literature on silk fibroin-derived biomaterials for biomedical applications.
This body of research explains that silk fibroin-derived materials are highly versatile for regenerative and biomedical uses because they offer favorable mechanical properties, processability, and biocompatibility. The literature also highlights future directions involving intelligent biomaterials, sensors, and wearable health applications. For my project, this supports the use of Bombyx mori silk fibroin as a model for designing recombinant or inspired protein materials that may later be translated into films, fibers, or interfaces for soft systems. It therefore provides a bridge between molecular material design and rehabilitation-oriented device thinking.
Novelty and Innovation
This project is innovative because it does not begin with the actuator as the primary design object. Instead, it begins with the genetic design of a material building block that could later support soft robotic and textile applications. Rather than only using existing elastomers or fabrics, it explores whether protein-inspired sequence design can become part of a material-centered workflow for rehabilitation technology. The work is also novel because it connects synthetic biology tools such as Gibson Assembly with a design research question rooted in biomaterials, soft robotics, and future wearable rehabilitation systems.
Why This Project Matters and What Impact It Could Have
This project matters because rehabilitation devices are often limited by discomfort, poor adaptability, and a mismatch between rigid engineered materials and the soft, dynamic nature of the human body. Soft robotics has improved this situation, but there is still a major barrier in developing materials that combine compliance, structure, biocompatibility, and designability in one platform. By exploring recombinant protein design inspired by silk fibroin and elastic domains, this project proposes an upstream strategy for creating future materials that are programmable at the sequence level.
If successful, this work could contribute to new scientific and technical capabilities in the design of biologically inspired fibers, coatings, or composite interfaces for rehabilitation systems. Beyond the immediate project, the approach could help expand synthetic biology into design-led biomaterial development, opening possibilities in wearable health, biomedical manufacturing, and adaptive assistive technologies. At a field level, achieving these aims could shift part of soft robotics research from selecting existing materials toward encoding material function directly into designed biological sequences.
Ethical Implications
This project raises ethical questions related to responsibility, beneficence, and care. Because it uses genetic design and cloning methods, even at a small and non-pathogenic laboratory scale, it must be conducted with care regarding biosafety, containment, and responsible communication. Another ethical issue is translational overclaim: it would be inappropriate to suggest that an early-stage recombinant material construct is already a safe rehabilitation technology for patients. There are also broader concerns about access and fairness. If protein-designed biomaterials eventually enable advanced rehabilitation devices, those technologies should not become available only to well-funded laboratories or privileged health systems.
To ensure the project is ethical, the experimental scope should be limited to standard non-pathogenic laboratory strains, non-harmful recombinant sequences, and institutionally approved cloning practices. The project should clearly state that this work is a foundational material-design study, not a clinical intervention. Potential unintended consequences include failed assumptions about expression, folding, or material behavior, as well as overestimating the translational relevance of silk-inspired sequences. Alternatives include using non-recombinant silk fibroin, commercially available biomaterials, or simulation-based design approaches if biological uncertainty becomes too high. Ethical conduct in this project therefore requires transparent reporting of uncertainties, proportional claims, and attention to long-term access, sustainability, and safety in future applications.
SECTION 4: EXPERIMENTAL DESIGN, TECHNIQUES, TOOLS, AND TECHNOLOGY
Experimental Hypothesis
A recombinant DNA construct encoding a silk-inspired or silk-elastin-like protein module can be rationally designed and assembled using Gibson Assembly, creating a validated genetic platform for future biomaterial development relevant to rehabilitation-oriented soft systems.
Detailed Experimental Plan
Define the design target and functional logic In the first half day, I will define the biological rationale for the construct: a short recombinant protein containing a silk fibroin-inspired repetitive domain and, optionally, an elastic motif to introduce flexibility. Expected result: a clear design brief linking sequence motifs to desired material behavior.
Select protein motif sources from literature Over half a day to one day, I will review silk fibroin sequence features from Bombyx mori and identify a simplified motif suitable for classroom-scale DNA design. If appropriate, I will compare this with elastin-like motifs such as VPGXG repeats as a complementary domain. Expected result: a shortlist of feasible amino acid motifs for construct design.
Draft the protein architecture Over half a day, I will choose a modular protein layout such as His-tag + linker + silk-inspired repeat block + optional elastin-like block + stop codon. Expected result: a protein design schematic with module order and approximate length.
Codon-optimize the DNA sequence for E. coli In half a day, I will use Benchling or a similar design platform to codon-optimize the sequence for bacterial expression while minimizing problematic repeats or secondary structures when possible. Expected result: a codon-optimized DNA sequence ready for synthesis or PCR-based assembly.
Choose an expression plasmid backbone In half a day, I will select an appropriate plasmid backbone already available in class or lab, ideally one with a bacterial promoter, antibiotic resistance marker, and affinity-tag compatibility. Expected result: a plasmid map and insertion strategy.
Design Gibson overlaps In half a day, I will design 20–40 bp overlapping homology regions between insert and vector so the construct can be assembled by Gibson Assembly. Expected result: finalized primer or fragment overlap plan.
Plan fragment generation strategy In half a day, I will decide whether the insert will be obtained by gene synthesis, ordered fragment, or PCR amplification from designed oligos or templates, depending on course resources. Expected result: a practical build strategy and reagent list.
Prepare DNA fragments by PCR Over one day, I will amplify the vector backbone and/or insert fragments using a high-fidelity polymerase such as Phusion in order to reduce sequence errors. Expected result: visible DNA bands of expected size after gel verification.
Purify amplified DNA fragments In half a day, PCR products will be cleaned using spin-column purification or gel extraction if nonspecific bands are present. Expected result: purified DNA fragments suitable for assembly.
Perform Gibson Assembly reaction In half a day, purified overlapping fragments will be combined in the Gibson Assembly reaction according to the recommended molar ratios. Expected result: assembled plasmid molecules containing the designed insert.
Transform assembled plasmid into competent E. coli In half a day plus overnight incubation, I will transform the assembly product into competent E. coli and plate the cells on selective agar. Expected result: antibiotic-resistant colonies indicating successful uptake of plasmid DNA.
Screen colonies by colony PCR Over half a day to one day, several colonies will be screened using primers flanking the insertion site to identify clones with the expected insert size. Expected result: one or more positive colonies with the correct amplicon length.
Miniprep positive clones In half a day, promising colonies will be grown in liquid culture and plasmid DNA will be isolated using a miniprep protocol. Expected result: purified plasmid DNA from candidate correct clones.
Sequence-verify the construct Over two to four days depending on turnaround time, I will submit the plasmid for Sanger sequencing to verify insert identity and reading-frame integrity. Expected result: confirmed plasmid sequence matching the designed construct.
Analyze construct quality and feasibility In half a day, I will compare the sequencing result against the original design and note any mutations, assembly issues, or repeat instability. Expected result: a validated final plasmid map and a build assessment.
Optional expression test If time allows, over one to two days I will run a small exploratory expression test in E. coli and evaluate crude lysate or SDS-PAGE evidence of a protein band at the expected size. Expected result: preliminary indication of whether the construct is compatible with bacterial expression.
Interpretation for biomaterial relevance In half a day, I will relate the verified construct back to the larger design question: how sequence-defined biological materials could eventually support films, fibers, coatings, or reinforcement elements for wearable soft systems. Expected result: a design-oriented conclusion rather than only a cloning result.
Document the workflow visually In half a day, I will prepare a figure showing sequence design, plasmid assembly, clone validation, and future material translation. Expected result: a clear workflow figure for the report and presentation.
Approximate Timeline
Design and literature selection: 5 days
Sequence planning, codon optimization, and overlap design: 5 days
PCR, cleanup, and Gibson Assembly: 10 days
Transformation and colony growth: 1 day theory
Colony PCR and miniprep: 1 day theory
Sanger confirmation: 2–4 days theory
Optional expression test and interpretation: 1–2 days theory
Specific Methods, Tools, Technologies, and Concepts
Benchling for DNA and plasmid design
Codon optimization for bacterial expression
High-fidelity PCR
Gibson Assembly
E. coli transformation
Colony PCR
Miniprep and Sanger sequencing
Protein-inspired biomaterial design
Silk fibroin motif abstraction from Bombyx mori
Optional modular design using silk-elastin-like protein logic
Expected Overall Results
The most realistic expected result for this course is a bioispired outputverified recombinant plasmid encoding a protein-inspired biomaterial module. A strong outcome would be a sequence-confirmed construct with correct assembly and a clear rationale for future expression and material testing. If expression screening is possible, an additional expected result would be preliminary evidence that the construct is compatible with bacterial production, although this would be considered a stretch goal rather than a requirement.