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SignalSilence® HtrA2/Omi siRNA I

SignalSilence® HtrA2/Omi siRNA I #7574

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SignalSilence® HtrA2/Omi siRNA I: Image 1
Western blot analysis of extracts from 293T cells, transfected with 100 nM SignalSilence® Control siRNA (Unconjugated) #6568 (-) or SignalSilence® HtrA2/Omi siRNA I (+), using HtrA2/Omi (D20A5) Rabbit mAb #9745 (upper) or GAPDH (D16H11) XP® Rabbit mAb #5174 (lower). The HtrA2/Omi (D20A5) Rabbit mAb confirms silencing of HtrA2/Omi expression, while the GAPDH (D16H11) XP® Rabbit mAb is used as a loading control.

Supporting Data


Application Key:

  • WB-Western Blot
  • IP-Immunoprecipitation
  • IHC-Immunohistochemistry
  • ChIP-Chromatin Immunoprecipitation
  • C&T-CUT&Tag
  • DB-Dot Blot
  • IF-Immunofluorescence
  • F-Flow Cytometry

Species Cross-Reactivity Key:

  • H-Human
  • M-Mouse
  • R-Rat
  • Hm-Hamster
  • Mk-Monkey
  • Vir-Virus
  • Mi-Mink
  • C-Chicken
  • Dm-D. melanogaster
  • X-Xenopus
  • Z-Zebrafish
  • B-Bovine
  • Dg-Dog
  • Pg-Pig
  • Sc-S. cerevisiae
  • Ce-C. elegans
  • Hr-Horse
  • Rab-Rabbit
  • All-All Species Expected

Product Usage Information

CST recommends transfection with 100 nM SignalSilence® HtrA2/Omi siRNA I 48 to 72 hours prior to cell lysis. For transfection procedure, follow protocol provided by the transfection reagent manufacturer. Please feel free to contact CST with any questions on use.

Each vial contains the equivalent of 100 transfections, which corresponds to a final siRNA concentration of 100 nM per transfection in a 24-well plate with a total volume of 300 μl per well.


SignalSilence® siRNA is supplied in RNAse-free water. Aliquot and store at -20ºC.

Product Description

SignalSilence® HtrA2/Omi siRNA I from Cell Signaling Technology (CST) allows the researcher to specifically inhibit HtrA2/Omi expression using RNA interference, a method whereby gene expression can be selectively silenced through the delivery of double stranded RNA molecules into the cell. All SignalSilence® siRNA products from CST are rigorously tested in-house and have been shown to reduce target protein expression by western analysis.

Quality Control

Oligonucleotide synthesis is monitored base by base through trityl analysis to ensure appropriate coupling efficiency. The oligo is subsequently purified by affinity-solid phase extraction. The annealed RNA duplex is further analyzed by mass spectrometry to verify the exact composition of the duplex. Each lot is compared to the previous lot by mass spectrometry to ensure maximum lot-to-lot consistency.


High temperature requirement protein A2 (HtrA2)/Omi is a serine protease with homology to the E. coli HtrA protein (DegP) and is thought to be involved in apoptosis and stress-induced degradation of misfolded proteins (1). While HtrA2 was orignally identified to be present in either the nucleus (1) or endoplasmic reticulum (2), subsequent studies have shown that it localizes in mitochondria and is released during apoptosis (3-7). HtrA2 is produced as a 50 kDa zymogen that is cleaved to generate a 36 kDa mature protein that exposes an amino terminal motif (AVPS) resembling that of the IAP inhibitor Smac/Diablo (3-7). Like Smac, interaction between HtrA2 and IAP family members, such as XIAP, antagonizes their inhibition of caspase activity and protection from apoptosis (3-7). Interestingly, HtrA2 knock-out mice did not show signs of reduced apoptosis, but rather had a loss of neurons in the striatum and a Parkinson's-like phenotype, suggesting that HtrA2 might have a neuroprotective function (8-10). This activity is associated with the protease activity of HtrA2 (8). Furthermore, research studies have shown that loss of function mutations in the HtrA2 gene are associated with Parkinson's disease (11).
  1. Gray, C.W. et al. (2000) Eur. J. Biochem. 267, 5699-5710.
  2. Faccio, L. et al. (2000) J. Biol. Chem. 275, 2581-2588.
  3. Suzuki, Y. et al. (2001) Mol. Cell 8, 613-621.
  4. Hegde, R. et al. (2002) J. Biol. Chem. 277, 432-438.
  5. Martins, L.M. et al. (2002) J. Biol. Chem. 277, 439-444.
  6. van Loo, G. et al. (2002) Cell Death Differ. 9, 20-26.
  7. Verhagen, A.M. et al. (2002) J. Biol. Chem. 277, 445-454.
  8. Jones, J.M. et al. (2003) Nature 425, 721-727.
  9. Martins, L.M. et al. (2002) J. Biol. Chem. 277, 439-444.
  10. Vaux, D.L. and Silke, J. (2003) Cell 115, 251-253.
  11. Jones, J.M. et al. (2003) Nature 425, 721-727.
  12. Martins, L.M. et al. (2004) Mol. Cell Biol. 24, 9848-9862.
  13. Vaux, D.L. and Silke, J. (2003) Cell 115, 251-253.
  14. Strauss, K.M. et al. (2005) Hum. Mol. Genet. 14, 2099-2111.
  15. Martins, L.M. et al. (2004) Mol. Cell Biol. 24, 9848-9862.
  16. Strauss, K.M. et al. (2005) Hum. Mol. Genet. 14, 2099-2111.

Pathways & Proteins

Explore pathways + proteins related to this product.

Limited Uses

Except as otherwise expressly agreed in a writing signed by a legally authorized representative of CST, the following terms apply to Products provided by CST, its affiliates or its distributors. Any Customer's terms and conditions that are in addition to, or different from, those contained herein, unless separately accepted in writing by a legally authorized representative of CST, are rejected and are of no force or effect.

Products are labeled with For Research Use Only or a similar labeling statement and have not been approved, cleared, or licensed by the FDA or other regulatory foreign or domestic entity, for any purpose. Customer shall not use any Product for any diagnostic or therapeutic purpose, or otherwise in any manner that conflicts with its labeling statement. Products sold or licensed by CST are provided for Customer as the end-user and solely for research and development uses. Any use of Product for diagnostic, prophylactic or therapeutic purposes, or any purchase of Product for resale (alone or as a component) or other commercial purpose, requires a separate license from CST. Customer shall (a) not sell, license, loan, donate or otherwise transfer or make available any Product to any third party, whether alone or in combination with other materials, or use the Products to manufacture any commercial products, (b) not copy, modify, reverse engineer, decompile, disassemble or otherwise attempt to discover the underlying structure or technology of the Products, or use the Products for the purpose of developing any products or services that would compete with CST products or services, (c) not alter or remove from the Products any trademarks, trade names, logos, patent or copyright notices or markings, (d) use the Products solely in accordance with CST Product Terms of Sale and any applicable documentation, and (e) comply with any license, terms of service or similar agreement with respect to any third party products or services used by Customer in connection with the Products.

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
SignalSilence is a registered trademark of Cell Signaling Technology, Inc.
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To Purchase # 7574
Cat. # Size Qty. Price
300 µl  (3 nmol)
$ 289

Important Ordering Details

Custom Ordering Details: Product is assembled upon order. Please allow up to three business days for your product to be processed.