NR ATLB
AU Saunders,G.C.; Horigan,V.; Tout,A.C.; Windl,O.
TI Identification of a proteinase K resistant protein for use as an internal positive control marker in PrP Western blotting
QU International Conference - Prion 2005: Between fundamentals and society's needs - 19.10.-21.10.2005, Congress Center Düsseldorf - Poster Session: Diagnosis DIA-39
PT Konferenz-Poster
AB
The routine use of an internal positive control (IPC) marker could prove useful in the diagnosis of transmissible spongiform encephalopathy (TSE) diseases, particularly in surveillance programmes where large numbers of negative results are reported. Detection of an endogenous IPC protein in a negative sample adds confidence that samples have been processed correctly throughout the analytical process and could avoid the reporting of false negative diagnoses. Proteinase K (PK) resistance is one of the key diagnostic determinants of the pathogenic form of PrP (PrPsc), the only disease-specific macromolecule currently associated with TSE disease. Additional PK resistant proteins, endogenous to TSE-suspect diagnostic tissue samples, were therefore assessed for use as IPC markers in the Western blot diagnosis of BSE and scrapie. Results indicated that, whilst essentially maintaining a standard PrP extraction and detection protocol, a ferritin heavy chain sub-unit of approximately 22 kDa, was consistently detected in all PK treated TSE positive and negative tissue samples tested. Its presence in a range of sample types, any of which could be submitted under BSE and scrapie surveillance programmes, confirmed it as a suitable protein for an IPC marker in PrPsc Western blotting.
Funding: Defra, UK
AD Ginny C. Saunders, Verity Horigan, Anna C. Tout, Otto Windl, VLA Weybridge, UK
SP englisch
PO Deutschland