Sylvean Biotech
siRNA Synthesis

Custom siRNA Synthesis

Genepharma's custom siRNA service provides the superior quality siRNAs that you need for cutting-edge gene silencing research - all at unbeatable prices. Custom siRNAs are offered at various yields and with various different modifications, including fluorescent labels. To ensure that the siRNAs are of the highest quality, all siRNAs are HPLC-purified as standard. In addition, each siRNA strand can be up to 30nt in length, allowing research on short siRNAs, long siRNAs and even dicer-substrate RNA - all at the same price.

The siRNA is provided in a stable, dried form, annealed and ready to use. The siRNA is delivered with a Technical Data Sheet that includes the name, sequence, concentration, precise quantity in OD and nmols, Tm, MW, size, extinction coefficient and purification data. Delivery time is approximately eight to thirteen working days.

To order custom siRNA, please us the siRNA sequences together with details of any modifications or labeling. (Discounts will apply if more than one siRNA is ordered.) To help you find the perfect siRNA, Genepharma even offers a free siRNA design service - just send us the target gene ID or sequence, and we will provide you with possible siRNA sequences, selected according to the most advanced algorithms.

Standard siRNA synthesis

Standard siRNAs are unmodified and can be up to 30nt in length. The two siRNA strands are usually perfectly complementary, except for dTdT dinucleotide 3' overhangs on each strand. Other siRNA designs are, of course, also available.

Standard siRNA
Cat. No. Yield Price
A01005 5 OD, HPLC-purified 1250
A01010 10 OD, HPLC-purified 1800
A01025 25 OD, HPLC-purified 3050
A01050 50 OD, HPLC-purified 5150
A01100 100 OD, HPLC-purified 8550
A01250 250 OD, HPLC-purified 16450
  • 1 OD is equivalent to approximately 2.5 nmoles of HPLC-purified siRNA duplexes.

Enhance siRNA Stability with Chemical Modifications

Unmodified siRNAs are susceptible to degradation by nucleases. A convenient solution to this problem involves the use of modified RNA nucleotides that confer nuclease resistance while retaining hydrogen bonding properties. Genepharma offers 2'-O-methyl- as well as 2-fluoro-modified siRNAs.

Chemically modified siRNA
Cat. No. Yield Price
A02005 5 OD, HPLC-purified 1450
A02010 10 OD, HPLC-purified 2050
A02025 25 OD, HPLC-purified 3650
A02050 50 OD, HPLC-purified 5900
A02100 100 OD, HPLC-purified 10400
A02250 250 OD, HPLC-purified 20400


Visualize siRNA Uptake with Fluorescent Labels

Fluorescently labeled siRNAs are commonly used to monitor transfection efficiency during optimization of transfection conditions. Fluorescent labeling of siRNAs allows direct observation of their cellular uptake, distribution, and localization as early as 3-4 hours after transfection. In contrast, uptake of unlabeled siRNAs must be monitored by target gene knockdown. Fluorescently labeled siRNAs are also ideal for examining the correlation between transfection efficiency and gene knockdown.
Genepharma offers FAM- as well as TAMRA-labeled siRNA. The fluorescent labels are usually added to the 5' end of the sense strand, and do not affect the biological activity of the siRNA. Other labels such as DABCYL and Biotin are also available upon request.

Fluorescently labeled siRNA
Cat. No. Yield Price
A03005 5 OD, HPLC-purified 1600
A03010 10 OD, HPLC-purified 2400
A03025 25 OD, HPLC-purified 4200
A03050 50 OD, HPLC-purified 7250
A03100 100 OD, HPLC-purified 10100
A03250 250 OD, HPLC-purified 23000


siRNA experimental controls

In addition to the fluorescently labeled siRNA, Genepharma offers a variety of internal controls for development and optimization of siRNA experiments:

  • Negative control siRNAs are designed to have the same nucleotide composition as your siRNA, but without homology to the genome of the target organism.
  • A large range of positive control siRNAs are available, each with published and validated efficiency against the target gene.
  • In addition, to assess the extent to which the transfection procedure itself perturbs gene expression, mock transfection using only the transfection reagent is very useful.
Experimental controls
Cat. No. Yield Price
B01001 Negative control siRNA (1 OD, HPLC) 720
B02001 FAM-labeled negative control siRNA (1 OD, HPLC) 800
A03025 Positive control siRNA (1 OD, HPLC) 720
A03050 RNAi-mate transfection reagent 750


Frequently used positive control siRNA
Target gene name Target gene name
ß-actin GalTII (galactosyltransferase II)
gamma-actin GAS41 (1)
AIB1 (estrogen receptor coactivator) Hec-1
Apaf-1 HPV E6
ARC21 HPV E7
ATR interacting protein Tissue Factor (hTF)
Bcr-abl Vimentin
beta-tubulin- mouse neuronal HtrA2
Bruton's tyrosine kinase (Btk) keratin 18
Casein Kinase I epsilon and delta (CKI-epsilon and CKI-delta) Kinase interacting stathmin (hKIS)
Caspase 1 lamin A
Caspase 2 lamin A/C
hCdc2 lamin B1
Cdc14A lamin B2
cdk1 LAP2
CENP-E Mad1
CHO1 Mammalian septin (MSF)
corin, mouse Methyl-CpG-binding protein 2 (MeCP2)
Cyclin B1 Methyl-DpG binding domain protein 2 (MBD2)
Cyclin B2 MPS1 kinase (hMps1)
cytoplasmic dynein 1 heavy chain Nicastrin (Nct)
DIP13-alpha (DCC interacting protein) NuMA
Dishevelled (hDv-1 and hDv-3) Nup153
hDv-2 P160 ROCK
Eg5 Polo-like Kinase1 (hPlk1)
emerin Protein Kinase Receptor (PKR)
eve hRad9
hFbw7 (cyclin E ubiquitination) Rad17
Fortilin Myeloid cell leukemia protein 1 (MCL1)
GalTII (galactosyltransferase II)  


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