RNA Interference Services

RNAi vectors are a core technology for studying loss-of-function, validating tumor targets, and dissecting signaling pathway dependencies. Alfa Cytology has extensive expertise in RNAi vector construction. Leveraging optimized shRNA design algorithms and a diverse vector system, we provide gene silencing vectors with high knockdown efficiency. Our senior scientists can tailor shRNA vector solutions based on your target gene information and experimental system, and ensure knockdown efficiency and specificity through a rigorous quality control system, supporting your complete workflow from loss-of-function studies to target validation and drug screening.

Introduction to RNA Interference Vector

RNA interference (RNAi) is a double-stranded RNA-mediated post-transcriptional gene silencing mechanism in which small hairpin RNA (shRNA) is processed into small interfering RNA (siRNA), which then guides the RNA-induced silencing complex (RISC) to recognize and degrade target mRNA, thereby achieving specific knockdown of the gene of interest. Compared with gene knockout, RNAi enables reversible downregulation of gene expression without altering the genomic sequence, making it particularly suitable for cancer essential gene studies, gene function validation, and anti-tumor drug target screening. In oncology research, RNAi has been widely applied in tumor suppressor gene functional validation, synthetic lethality screening, drug resistance mechanism elucidation, and anti-cancer drug target discovery. Cancer cells transduced with RNAi vectors can achieve stable gene knockdown, providing an ideal tool for long-term tumor functional studies. Depending on experimental objectives, RNAi can be implemented through two strategies: transient transfection (siRNA) or stable expression (shRNA vectors). Transient transfection enables rapid gene knockdown within 24–72 hours post-transfection, making it suitable for short-term tumor functional validation; stable expression, achieved through lentivirus-mediated shRNA integration or drug selection, establishes cancer cell lines with long-term stable knockdown, making it suitable for long-window tumor functional studies and in vivo transplantation experiments.

Fig. 1 RNAi vector construction. (Jazag A, et al.; 2025)

Our Services

At Alfa Cytology, our RNAi services are based on shRNA expression vectors, providing efficient, target-specific gene silencing solutions with multiple promoter, selection marker, and reporter gene options, flexibly accommodating diverse experimental designs. Our senior scientists are committed to delivering integrated services from target design and vector construction to knockdown efficiency validation, strongly supporting tumor gene function analysis, drug resistance mechanism studies, and anti-tumor drug target discovery.

Vector Design and Construction

Based on your research objectives, we design and construct interference vectors carrying shRNA sequences. Services include:

• shRNA target design based on advanced algorithms (3–5 targets per gene).
• Double-stranded shRNA annealing and vector ligation.
• Multiple promoter options: U6, H1, CMV (Pol II promoter, inducible expression available).
• Selection markers: Puromycin, Blasticidin, Neomycin, Hygromycin.
• Reporter genes: GFP, mCherry (optional).
• Full-length sequencing validation to ensure 100% insert accuracy.

Knockdown Efficiency Validation

All shRNA constructs undergo rigorous knockdown efficiency validation:

• qPCR detection of mRNA-level knockdown efficiency after transfection into target cells.
• Western blot detection of protein-level knockdown efficiency (if required).
• Multi-target comparison to recommend the optimal target.
• Provision of a complete knockdown efficiency validation report.

Available Vector Types

We also offer construction services for knockdown stable cell lines, including transfection/transduction, monoclonal selection, stable cell line establishment, and knockdown efficiency validation (qPCR, Western blot).

Specifications

Applications of RNA Interference Vector Services

Drug Target Discovery/Validation

Screen and validate the druggability of candidate targets through RNAi-mediated gene silencing, and assess the impact of target inhibition on tumor cell phenotypes, providing critical support for drug screening and development.

Synthetic Lethality Screening

Conduct large-scale synthetic lethality screening using RNAi libraries to systematically identify targets that form synthetic lethal relationships with specific tumor driver mutations, providing candidate directions for novel anti-cancer drug development.

Drug Resistance Mechanism Studies

Elucidate the molecular mechanisms underlying tumor cell resistance to chemotherapy, targeted therapy, and immunotherapy by knocking down drug resistance-related genes, providing a basis for overcoming drug resistance and designing combination therapeutic strategies.

Establishment of In Vivo Knockdown Models

Deliver shRNAs in vivo via lentiviral vectors to establish stable knockdown animal models, evaluate their potential as therapeutic targets, and provide reliable tools for in vivo functional studies and preclinical evaluation.

Workflow of RNA Interference Vector Services

Project Consultation and Strategy Design

Our scientific team communicates closely with you to understand your research objectives, gene information, cell type, and knockdown level requirements, and designs the optimal RNAi target and vector construction strategy.

Vector Design and Construction

Based on the approved plan, shRNA target design, double-stranded annealing, vector ligation, and transformation are performed, followed by full-length Sanger sequencing verification.

Knockdown Efficiency Validation

The constructed interference vector is transfected into target cells, and knockdown efficiency is assessed at the mRNA level by qPCR and at the protein level by Western blot (if required) to validate shRNA interference efficacy.

Delivery and Downstream Application Support

Interference plasmids, glycerol stocks, and complete validation reports are delivered. If stable knockdown cell line construction or in vivo functional studies are required, seamless integration with the corresponding service platforms can be provided.

Service Highlights

Whether you are validating a tumor target, conducting synthetic lethality screening, or dissecting drug resistance mechanisms, Alfa Cytology delivers shRNA vectors with high knockdown efficiency and specificity. From target design and vector construction to qPCR and Western blot validation, we provide the tools and support your loss-of-function research demands. Contact us today to discuss your RNAi project.

For research use only.