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Custom & Predesigned esiRNA

All ordering and quotation options are in the esiRNA Specifications table.

MISSION® esiRNA—powered by Eupheria Biotech--provide RNAi researchers with a proven, cost-effective, and simple way to perform post-transcriptional silencing of protein-coding genes and lncRNA (long non-coding RNA). Biologically-prepared, esiRNA are comprised of a heterogeneous pool of siRNA (natural RNA, no modifications) that all target the same mRNA sequence. These multiple silencing triggers lead to highly specific and effective gene knockdowns with lower off-target effects than single, chemically-synthesized siRNA (Figure 1).

 

                                                       A. siRNA                                                        B. esiRNA

 Knockdown of target mRNA can be accomplished by chemically-synthesized siRNA or enzymatically-prepared siRNA (esiRNA)>

Figure 1. Knockdown of target mRNA can be accomplished by chemically-synthesized siRNA or enzymatically-prepared siRNA (esiRNA). A) Chemically-synthesized siRNA consists of a single silencing trigger of 21 bp that is complementary to the target mRNA. The high concentration of the siRNA in the transfection reaction leads to pronounced off-target effects. B) In contrast, esiRNA consists of a pool of hundreds of siRNA (21 bp) that cover a region of 300 – 600 bp of the target mRNA. Each individual siRNA has a lower concentration in the pool, leading to lower off-target effects, while producing an efficient knockdown.


 Product Benefits

Evaluation of gene knockdown in HeLa cells transfected with esiRNA directed against Renilla Luciferase (negative control) and different expressed targets at mRNA and protein levels>

Figure 2. Evaluation of gene knockdown in HeLa cells transfected with esiRNA directed against Renilla Luciferase (negative control) and different expressed targets at mRNA and protein levels. A) qPCR data validate knockdowns 24 hours post-transfection. The mRNA abundance was reduced by >90% in all transfections. B) Quantitative Western Blot data validate efficient knockdown 72 hours post-transfection. Protein levels were reduced 45 to 90%.


 Product Features

The following apply to all product options presented in the esiRNA specifications table:

For anything marked as ‘Inquire’ below or If you have needs that are different from the other general specifications presented, please send a request to sirnarequest@sial.com.

Browse the complete list of predesigned esiRNA.
 

esiRNA Product Options & Specifications
Individual esiRNA
  • Definition: Individual, predesigned esiRNA for single protein-coding genes & lncRNA (search lncRNA by Accession No.). All esiRNA are designed based on annotations from the ENSEMBL database.
  • Species: Human & Mouse
  • Quantities: 20 & 50 µg
  • Format: In nuclease-free TE buffer in tubes (standard) & 96 / 384-well plates (inquire) at a concentration of 200 ng µL-1
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esiLibrary

  • Definition: Predesigned esiRNA libraries for the whole genome & lncRNA transcriptome. All esiRNA are designed based on annotations from the ENSEMBL database.
  • Species: Human & Mouse
  • Quantities: 1, 2.5 & 5 µg
  • Format: In nuclease-free TE buffer in 96 & 384-well plates at a concentration of 50 ng µL-1

       

esiFLEX

  • Definition: Custom arrays chosen from the whole genome & lncRNA transcriptome collections. All esiRNA are designed based on annotations from the ENSEMBL database.
  • Species: Human & Mouse
  • Quantities: 1, 2.5 & 5 µg
  • Format: In nuclease-free TE buffer in 96 & 384-well plates at a concentration of 50 ng µL-1
  • Minimum array size: 24 targets
       

esiOPEN

  • Definition: Custom esiRNA for single protein-coding genes & lncRNA. Provide a 500 bp target sequence and esiRNA will be designed using DEQOR*.
  • Species: Any
  • Quantities: 20 & 50 µg
  • Format: In nuclease-free TE buffer in tubes at a concentration of 200 ng µL-1
       

esiSEC

  • Definition: Individual, secondary & independent esiRNA for validation of primary esiRNA targeting single protein-coding genes & lncRNA. All esiRNA are designed based on annotations from the ENSEMBL database.
  • Species: Human & Mouse
  • Quantities: 20 & 50 µg
  • Format: In nuclease-free TE buffer in tubes at a concentration of 200 ng µL-1

       

*DEQOR is the design algorithm for esiRNA. Details are described in: Henschel A, Bucholz F & Habermann B (2004). DEQOR: a web-based tool for the design and quality control of siRNAs. Nucleic Acids Res, 32, W113-120.

Control esiRNA

A variety of positive and negative controls are available (Figure 3):

Phenotypic analysis of HeLa cells transfected with esiRNA against A) RLUC (negative control) and B) Eg5/KIF11 (positive control)>

Figure 3. Phenotypic analysis of HeLa cells transfected with esiRNA against A) RLUC (negative control) and B) Eg5/KIF11 (positive control). RLUC does not induce any phenotypic changes, while Eg5/KIF11 induces mitotic arrest, shown by rounded cells.

Validated esiRNA

Many common gene targets have been validated for ≥70% mRNA knockdown (qPCR and Western Blot validation data). See the table for a list of commonly-ordered, validated esiRNA by gene symbol. Validated esiRNA are suitable for transfection optimization and as positive controls.
 

Validated Human esiRNA by Gene Symbol
ANAPC1 DCTN2 PLK4
ANAPC10 CETN3 RAD21
ANAPC5 H3F3A EDC4
AURKB INCENP SEC13L1
PPP2R3C KIF11 SEH1L
CENPA KIF23 SUV39H2
CEP192 LMNA TACC3
CETN2 MAD2L1 TUBG1
CKAP5 NEK2 TUBGCP3
CLASP1 NUMA1 TPX2
CCP110 NUP37  


 lncRNA esiRNA

Transcriptome analyses reveal that up to 90% of the genome is transcribed into non-coding RNA, which among other types, includes lncRNA. The lncRNA are associated with different functions, including chromatin modification, co-activation of transcription factors, transcription, interaction with RNA-binding proteins, and repression of promoters. In addition, lncRNA have been implicated in diseases such as cancer. The details of how lncRNA work must be further elucidated. The esiRNA are an effective screening tool to study lncRNA function (Figure 4).

qPCR data validating knockdown of lncRNA in HeLa cells 24 hours post-transfection with corresponding esiRNA>

Figure 4. qPCR data validating knockdown of lncRNA in HeLa cells 24 hours post-transfection with corresponding esiRNA. Controls were transfected with esiRNA against RLUC and used for normalization.


 Product Manufacturing

Biologically-prepared (Figure 5), esiRNA is manufactured by cleaving long dsRNA (double-stranded RNA) with the endoribonuclease, E. coli RNase III.

Manufacturing overview of esiRNA for single genes

Figure 5. Manufacturing overview of esiRNA for single genes. A) DEQOR is used to select the mRNA target region that will produce the largest number of highly-effective siRNA, cover all known transcript variants, and minimize off-target effects. B) The target region is extracted from the cDNA clone and amplified via PCR (both primers are used to introduce T7 promoters. C) The PCR product is transcribed in vitro utilizing RNA polymerases. D) The annealed and long, double-stranded RNA (dsRNA) is digested with RNase III, and purification removes the DNA template, residual NTPs, and incompletely digested dsRNA. Finally, esiRNA is ready as a pool of hundreds of siRNA with an average duplex length of 21 bp.


 Video Tutorial

To learn about screening in Mammalian cells with esiRNA, see this video on YouTube.


 Frequently Asked Questions

To learn more about esiRNA, visit our Frequently Asked Questions section.


 Select Citations

Single-Gene esiRNA

Whole Genome & Sub-Library Screens

lncRNA esiRNA

If additional help is needed, please consult our technical services group at oligotechserv@sial.com.

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