Staphylococcus aureus

Genome Editing Service for Staphylococcus aureus

1. Research Background

Staphylococcus aureus is a common and clinically significant pathogen. Research into its drug resistance (e.g., MRSA) and pathogenicity mechanisms constitutes a central challenge in the fields of microbiology and infectious diseases. Precise and efficient gene-editing technology provides a crucial tool for in-depth investigation of its functional genomics and for developing novel therapeutic targets and control strategies. In this context, GeneRulor offers microbial genome modification services using the CRISPR/Cas9 method, enabling customized gene knockout, large-fragment deletion, point mutation, and gene knock-in (overexpression) in various bacterial types, delivering positive mutant strains. We are committed to providing professional and reliable customized Staphylococcus aureus genome editing solutions for global research and industrial clients.

2. Strain Characteristics and Biological Background

(1) Gram-staining property: Staphylococcus aureus is a Gram-positive bacterium. Its most notable physical characteristic is a thick peptidoglycan cell wall (approximately 20-80nm) and the absence of the outer membrane structure found in Gram-negative bacteria.

(2) Clinical significance: It is a common human pathogen capable of causing diseases ranging from skin infections to severe conditions like sepsis and pneumonia. The emergence of methicillin-resistant Staphylococcus aureus (MRSA), in particular, has made the study of its resistance mechanisms a core challenge.

(3) Metabolism and applications: It exhibits strong environmental adaptability and serves as an ideal model for studying biofilm formation, toxin secretion, and host-pathogen interactions.

Figure 1. Growth of S. aureus USA300 on TSB Agar Plates

3. Gene-Editing Strategies Reported in the Literature

To address the transformation challenges posed by the thick cell wall of S. aureus, mainstream editing strategies employed in current literature and research practice include:

3.1 CRISPR/Cas9 System (Primary Solution):

(1) Principle: Utilizes the Cas9 protein (containing RuvC and HNH nuclease domains) to conduct site-specific cleavage of target genomic DNA under the guidance of an sgRNA.

(2) Advantage: Induces repair via double-strand breaks (DSBs), enabling highly efficient gene knockout, large-fragment deletion, or gene knock-in (overexpression).

3.2 Homologous Recombination:

Often employed using suicide plasmids or shuttle plasmids, achieving precise base substitution or seamless editing through upstream and downstream homologous arms.

3.3 Site-Specific Recombination:

Utilizes recombinase systems for gene insertion or deletion at specific sites, suitable for modifying complex strains.

3.4 Transformation Efficiency Optimization:

For clinical isolates (e.g., the USA300 lineage), it is often necessary to optimize electroporation conditions or use recipient strains deficient in restriction-modification systems to overcome the transformation barrier caused by the thick cell wall.

4. Core Application Areas

(1) Functional Genomics: Precise deletion of target genes (knockout) to study their functions in metabolism or pathogenesis.

(2) Drug Resistance Mechanism Analysis: Introduction of point mutations to mimic natural variants, analyzing the evolutionary patterns of antibiotic resistance.

(3) Synthetic Biology Engineering: Insertion of reporter genes (e.g., fluorescent proteins) into the genome for real-time monitoring of strain dynamics within hosts or the environment.

(4) Engineered Strain Construction: Sequential editing of multiple genes for the development of attenuated vaccine strains or industrial production strains.

5. Project Workflow and Validation

We provide a one-stop service from design to delivery, ensuring the accuracy of editing outcomes:

(1) Design and Vector Construction: Designing knockout vectors for the target sites.

(2) Bacterial Transformation and Screening: Overcoming transformation challenges for positive clones.

(3) Comprehensive Validation: Ensuring positive mutations via PCR identification and Sanger sequencing.

Figure 2. Schematic Diagram of Project Workflow

6. Genome Editing Project Introduction

6.1 Core services include:

(1) Gene Knockout/Inactivation: Precise deletion or disruption of target genes for studying gene function, constructing mutant strains, or attenuated strains.

(2) Gene Knock-in/Overexpression: Insertion of reporter genes (e.g., fluorescent proteins, enzymatic tags) or exogenous genes at specific genomic loci, or construction of overexpression strains.

(3) Point Mutation/Modification: Introduction of specific point mutations into the genome to mimic natural variation, study resistance mechanisms, or investigate protein function.

(4) Multi-gene Editing: Achieving sequential or simultaneous editing of multiple genes for constructing complex engineered strains.

6.2 Technical Advantages:

(1) High Success Rate: Optimized protocols for the transformation and editing of various strains, including clinical isolates.

(2) Customized Design: Designing the optimal editing strategy based on your research objectives (e.g., studying biofilm formation, toxin expression, antibiotic resistance).

(3) End-to-End Validation: Providing a one-stop service encompassing editing strategy design, vector construction, bacterial transformation, screening, and final genotype verification.

7. Case Studies

We have successfully provided services for numerous top universities, research institutes, and biotech companies both domestically and internationally. Below is an example:

Case Study: Research on Virulence Factors in a Clinical MRSA Strain

Project Description: Successfully knocked out a key virulence gene in a methicillin-resistant Staphylococcus aureus (MRSA) clinical isolate.

Figure 3. Monoclonal Colony Screening and Identification of Target Gene Knockout in S. aureus USA300

Figure 4. Sequencing Results Confirming Successful Target Gene Knockout

8. Reference

[1] Tong, S. Y., et al. (2015). Staphylococcus aureus infections: Epidemiology, pathophysiology, clinical manifestations, and management. Clinical Microbiology Reviews.

[2] Bruckner, R. (1997). Gene replacement in Staphylococcus aureus via homologous recombination. Methods in Molecular Biology.

[3] Jiang, W., et al. (2013). RNA-guided editing of bacterial genomes using CRISPR-Cas systems. Nature Biotechnology.

[4] Luo, M. L., et al. (2016). The CRISPR/Cas9 system as a tool for editing the genomes of Staphylococcus aureus. Applied and Environmental Microbiology.

Cooperate with Us

By choosing us, you will gain an experienced and technically proficient partner in genome editing. We commit to accelerating your research or projects with professional technologies, rigorous processes， and efficient communication.

Consult us now to obtain your customized editing scheme and quotation!