The RNAi Core Facility supports Memorial Sloan-Kettering investigators with resources and tools related to RNA interference (RNAi) technologies, which can be used to study individual genes, dissect signaling pathways, and identify potential drug targets. We provide existing siRNA and shRNA libraries, customized shRNA reagents, and RNAi screening services.
RNAi Ordering Services
The RNAi core provides the following reagents:
- Stem-loop shRNA clones from The RNAi Consortium (TRC) libraries supplied by Sigma-Aldrich (TRC 1.0, 1.5 and 2.0). These include 100,000 clones against over 16,000 human and mouse genes, and appropriate lentivirus transduction controls supplied by Sigma-Aldrich.
- Pooled siRNAs from two human siRNA libraries supplied by Thermo Fisher Scientific, siGENOME, and ON-TARGETplus. These include 18,174 pooled siRNAs against 19040 genes.
Focused shRNA Pooled Libraries
Working in close collaboration with the laboratory of Scott W. Lowe, of the Sloan-Kettering Institute’s Cancer Biology and Genetics Program, we provide investigators with various focused mir30 shRNA pooled libraries that target specific gene groups such as kinome, epigenome, drugged genome, DNA-damage-repair-response genes, and many others.
Custom miR-30 shRNA and high-potency miR-E shRNA
Upon receiving a list of genes of interest to an investigator, the RNAi Core designs shRNAs against these genes using algorithms developed by Dr. Lowe’s lab. It then constructs off-the-chip libraries, and makes recommendations for experimental optimization.
The choice of vector backbone, lentivirus or retrovirus delivery system, fluorescent markers, promoters, and selection markers can be provided in either a constitutive or inducible format. We clone individual shRNA and pool libraries.
CRISPR-cas9 systems, individual and screening libraries
In addition to Genome-scale GeCKO library, we provide custom order individual CRISPR or screening libraries.
The RNAi Core conducts RNAi-based screening of pooled shRNA libraries, arrayed focused shRNA libraries (using one individual shRNA per well), and siRNA libraries (using pooled siRNA against one gene per well).
Our shRNA pools are offered for positive or negative selection screen, usually analyzed by cell sorting through fluorescence reporters, followed by deep sequencing. The screening readouts for arrayed libraries may be cell viability (such as luminescence-based ATP measurement or fluorescence-based redox activity measurement) via a plate reader, or high-content fluorescent image quantification with an automated fluorescence microscope.
The RNAi screening service covers development and optimization, screen execution, data analysis, and candidate gene nomination with follow-up confirmation studies such as secondary screens and reversal of gene silencing by expressing cDNA. The initial consultation to evaluate the technical feasibility of the assay is free.