Parts Collection

Introduction

The need for point-of-care sepsis diagnostics is critical, as early detection and intervention are essential for improving patient outcomes and reducing mortality. Traditional diagnostics often rely on centralized laboratories and lengthy processes, delaying crucial treatment decisions. DNA computing, when interfaced with CasX, offers a powerful solution by enabling rapid, programmable detection of pathogens and antimicrobial resistance directly at the point of care. This approach combines the precision of CRISPR technology with the flexibility of DNA-based logic gates, making it ideal for fast, accurate diagnostics. The modular design of our parts collection is essential to meet the growing demand for customizable, reprogrammable diagnostics that can be easily adapted to various pathogens, including resistant bacteria and viruses. This system empowers healthcare providers with the tools needed for timely, effective sepsis management.


Our synthetic biology parts collection is built on the principle of modularity, allowing for easy reengineering using a Python script and a dry lab DNA computing compiler tool. It includes reengineered tracrRNAs, CasX enzyme sequences, engineered dsDNA target strands for CasX, analog-to-digital converter components, helper and docker strands, and reporter gates—independently designed by McGill iGEM. Additionally, positive controls and measurement materials are included for calibration tests of these diagnostic devices.


See the Parts Registry pages for documentation and deeper explanations of components. For more explanation of the modularity of our system and re-engineering, see our Modularity page.


General Parts

Reporter Gates: These are dsDNA fragments with toeholds and fluorophores attached, allowing them to report rates of DNA strand displacement for all the reactions carried out in DNA computing and amplification assays.

NumberTypeName
BBa_K5099000BasicRep[1]
BBa_K5099012BasicRep[2]
BBa_K5099011BasicRep[3]
BBa_K5099013BasicRep[4]

CasX system

CasX Amplification System

Protein: DpbCas12e was used for expression for in vitro reactions. The fusion protein construct used consists of two Histags, an MBP, and the DpbCas12e nuclease.

NumberTypeName
BBa_K5099000CompositeCasX In Vitro Construct
BBa_K5099022BasicDpbCas12e Protein

tracrRNAs: Engineered activators of DpbCas12e protein.

NumberTypeName
BBa_K5099014Basictracr wt
BBa_K5099015Basictracr tetX spacer
BBa_K5099001Basictracr kpc2r
BBa_K5099016Basictracr tetX
BBa_K5099017Basictracr vana/b
BBa_K5099018BasictracrAAN
BBa_K5099019Basictracr TTT
BBa_K5099020Basictracr ANA

dsDNA Target Strands: Engineered ligands of the CasX system, made for DNA computing.

NumberTypeName
BBa_K5099023BasicdsDNA cleavage target wt spacer
BBa_K5099024BasicdsDNA cleavage target kpc2
BBa_K5099025BasicdsDNA cleavage target tetX
BBa_K5099026BasicdsDNA cleavage target vana/b

Complete detection devices:

NumberTypeName
BBa_K5099027CompositeCasX_AMR_Device