Real-time quaking-induced conversion

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Real-time quaking-induced conversion (RT-QuIC) is a highly sensitive assay for prion detection. [1]

Contents

Technique

The "quaking" in the name of the technique refers to the fact that samples in the RT-QuIC assay are literally subjected to shaking. This action breaks apart aggregates of prion protein (PrP) that are then further incubated, amplifying the amount of misfolded PrP to detectable levels. [2] [3]

It is "an early, rapid and specific assay for prion diseases". It can sample multiple sample types, such as cerebrospinal fluid (CSF), brain, lymph nodes, blood, muscle, and skin, and so it is applicable to scrapie in sheep, chronic wasting disease (CWD) in cervids, bovine spongiform encephalopathy (BSE) in cows and sporadic Creutzfeldt–Jakob disease in humans, amongst others. [4]

The RT-QuIC assay uses in excess recombinantly produced normally folded prions, often a truncated Syrian Hamster protein, amino acids 90-231. Samples suspected of containing misfolded prions are added, leading to misfolding and aggregation of normally folded prions. These protein aggregates can be detected by thioflavin T visible spectrum fluorescence detection. [5] [6] [7] The Centers for Disease Control and Prevention includes a positive RT-QuIC result in its diagnostic criteria for the probable diagnosis of sCJD. [8]

RT-QuIC assays can also be used to test for scrapie, BSE, and CWD. Various procedures can improve sensitivity and specificity. Iron oxide metal extraction (IOME) uses the natural metal affinity of the prion protein; a sample is incubated with magnetic beads, which bind to the prion protein. The prion-rich bead fraction is subsequently harvested and tested. [9]

Commonly tested tissues are brain homogenates and lymph tissues; however, prions have also been detected in skin and blood samples. [10] [11] [12] Certain tissues can be difficult to test for prions. For example, blood samples tend to have low levels of circulating intracellular prions and have inhibitors of the assay. [13]

See also

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References

  1. ↑ Zerr, Inga; Cramm, Maria; da Silva Correia, Susana Margarida; Zafar, Saima; Villar-Piqué, Anna; Llorens, Franc; Schmitz, Matthias (2020-11-19). "Optimization of the Real-Time Quaking-Induced Conversion Assay for Prion Disease Diagnosis". Frontiers in Bioengineering and Biotechnology. 8: 586890. doi: 10.3389/fbioe.2020.586890 . ISSN   2296-4185. PMC   7710546 . PMID   33330419.
  2. ↑ Lewczuk, Piotr; Riederer, Peter; O’Bryant, Sid E.; Verbeek, Marcel M.; Dubois, Bruno; Visser, Pieter Jelle; Jellinger, Kurt A.; Engelborghs, Sebastiaan; Ramirez, Alfredo; Parnetti, Lucilla; Jack, Clifford R.; Teunissen, Charlotte E.; Hampel, Harald; Lleó, Alberto; Jessen, Frank; Glodzik, Lidia; de Leon, Mony J.; Fagan, Anne M.; Molinuevo, José Luis; Jansen, Willemijn J.; Winblad, Bengt; Shaw, Leslie M.; Andreasson, Ulf; Otto, Markus; Mollenhauer, Brit; Wiltfang, Jens; Turner, Martin R.; Zerr, Inga; Handels, Ron; Thompson, Alexander G.; Johansson, Gunilla; Ermann, Natalia; Trojanowski, John Q.; Karaca, Ilker; Wagner, Holger; Oeckl, Patrick; van Waalwijk van Doorn, Linda; Bjerke, Maria; Kapogiannis, Dimitrios; Kuiperij, H. Bea; Farotti, Lucia; Li, Yi; Gordon, Brian A.; Epelbaum, Stéphane; Vos, Stephanie J. B.; Klijn, Catharina J. M.; Van Nostrand, William E.; Minguillon, Carolina; Schmitz, Matthias; Gallo, Carla; Lopez Mato, Andrea; Thibaut, Florence; Lista, Simone; Alcolea, Daniel; Zetterberg, Henrik; Blennow, Kaj; Kornhuber, Johannes (27 October 2017). "Cerebrospinal fluid and blood biomarkers for neurodegenerative dementias: An update of the Consensus of the Task Force on Biological Markers in Psychiatry of the World Federation of Societies of Biological Psychiatry". The World Journal of Biological Psychiatry. 19 (4): 244–328. doi: 10.1080/15622975.2017.1375556 . PMC   5916324 . PMID   29076399.
  3. ↑ Cramm, Maria; Schmitz, Matthias; Karch, André; Mitrova, Eva; Kuhn, Franziska; Schroeder, Bjoern; Raeber, Alex; Varges, Daniela; Kim, Yong-Sun; Satoh, Katsuya; Collins, Steven; Zerr, Inga (1 April 2015). "Stability and Reproducibility Underscore Utility of RT-QuIC for Diagnosis of Creutzfeldt-Jakob Disease". Molecular Neurobiology. 53 (3): 1896–1904. doi: 10.1007/s12035-015-9133-2 . PMC   4789202 . PMID   25823511.
  4. ↑ Atarashi, R.; Sano, K.; Satoh, K.; Nishida, N. (2011). "Real-time quaking-induced conversion: A highly sensitive assay for prion detection". Prion. 5 (3): 150–3. doi:10.4161/pri.5.3.16893. PMC   3226039 . PMID   21778820.
  5. ↑ Haley NJ, Hoover EA (2015). "Chronic wasting disease of cervids: current knowledge and future perspectives". Annual Review of Animal Biosciences. 3: 305–25. doi:10.1146/annurev-animal-022114-111001. PMID   25387112.
  6. ↑ Atarashi R, Satoh K, Sano K, Fuse T, Yamaguchi N, Ishibashi D, Matsubara T, Nakagaki T, Yamanaka H, Shirabe S, Yamada M, Mizusawa H, Kitamoto T, Klug G, McGlade A, Collins SJ, Nishida N (February 2011). "Ultrasensitive human prion detection in cerebrospinal fluid by real-time quaking-induced conversion" (PDF). Nature Medicine. 17 (2): 175–78. doi:10.1038/nm.2294. hdl: 10069/25642 . PMID   21278748. S2CID   11381303.
  7. ↑ Orrú CD, Bongianni M, Tonoli G, Ferrari S, Hughson AG, Groveman BR, Fiorini M, Pocchiari M, Monaco S, Caughey B, Zanusso G (August 2014). "A test for Creutzfeldt–Jakob disease using nasal brushings". The New England Journal of Medicine. 371 (6): 519–29. doi:10.1056/NEJMoa1315200. PMC   4186748 . PMID   25099576.
  8. ↑ "CDC's Diagnostic Criteria for Creutzfeldt–Jakob Disease (CJD), 2018". Centers for Disease Control and Prevention. September 17, 2018. Retrieved November 22, 2018. Adapted from:
    a) Global surveillance, diagnosis, and therapy of human transmissible spongiform encephalopathies: Report of a WHO consultation, February 1998, Geneva, Switzerland;
    b) Zerr et al. 2009
    c) National CJD Research & Surveillance Unit. Protocol: Surveillance of CJD in the UK. Item c accessed 15 Aug 2018.
    Zerr I, Kallenberg K, Summers DM, Romero C, Taratuto A, Heinemann U, Breithaupt M, Varges D, Meissner B, Ladogana A, Schuur M, Haik S, Collins SJ, Jansen GH, Stokin GB, Pimentel J, Hewer E, Collie D, Smith P, Roberts H, Brandel JP, van Duijn C, Pocchiari M, Begue C, Cras P, Will RG, Sanchez-Juan P (October 2009). "Updated clinical diagnostic criteria for sporadic Creutzfeldt-Jakob disease". Brain. 132 (Pt 10): 2659–68. doi:10.1093/brain/awp191. PMC   2759336 . PMID   19773352.
  9. ↑ Denkers ND, Henderson DM, Mathiason CK, Hoover EA (August 2016). "Enhanced prion detection in biological samples by magnetic particle extraction and real-time quaking-induced conversion". J Gen Virol. 97 (8): 2023–2029. doi:10.1099/jgv.0.000515. PMC   5903251 . PMID   27233771.
  10. ↑ Mammana A, Baiardi S, Rossi M, Franceschini A, Donadio V, Capellari S, Caughey B, Parchi P (April 2020). "Detection of prions in skin punch biopsies of Creutzfeldt-Jakob disease patients". Ann Clin Transl Neurol. 7 (4): 559–564. doi:10.1002/acn3.51000. PMC   7187701 . PMID   32141717.
  11. ↑ Concha-Marambio L, Pritzkow S, Moda F, Tagliavini F, Ironside JW, Schulz PE, Soto C (December 2016). "Detection of prions in blood from patients with variant Creutzfeldt-Jakob disease". Sci Transl Med. 8 (370): 370ra183. doi:10.1126/scitranslmed.aaf6188. PMC   5538786 . PMID   28003548.
  12. ↑ Orrú CD, Yuan J, Appleby BS, Li B, Li Y, Winner D, Wang Z, Zhan YA, Rodgers M, Rarick J, Wyza RE, Joshi T, Wang GX, Cohen ML, Zhang S, Groveman BR, Petersen RB, Ironside JW, Quiñones-Mateu ME, Safar JG, Kong Q, Caughey B, Zou WQ (November 2017). "Prion seeding activity and infectivity in skin samples from patients with sporadic Creutzfeldt-Jakob disease". Sci Transl Med. 9 (417). doi:10.1126/scitranslmed.aam7785. PMC   5744860 . PMID   29167394.
  13. ↑ Orrú CD, Wilham JM, Raymond LD, Kuhn F, Schroeder B, Raeber AJ, Caughey B (2011). "Prion disease blood test using immunoprecipitation and improved quaking-induced conversion". mBio. 2 (3): e00078–11. doi:10.1128/mBio.00078-11. PMC   3101782 . PMID   21558432.
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