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Detection of feline immunodeficiency virus by a nested polymerase chain reaction
1Department of Microbiology and Immunology, Norwegian College of Veterinary Medicine, Oslo.
Abstract:
A specific and sensitive polymerase chain reaction (PCR) procedure for the detection of feline immunodeficiency virus (FIV) in peripheral blood mononuclear cells (PBMC) was developed. PBMC from both blood samples and cultures were digested by proteinase K in a lysis buffer, and after heat inactivation of the proteinase, the resultant material was used in a two step amplification protocol using nested sets of primers. Two independent amplifications, from the gag and pol genes respectively, were performed in each tube. The PCR was positive for six of 14 samples from FIV seropositive adult cats, while all 36 samples from seronegative cats were negative. In comparison with an antigen-capturing ELISA procedure, the PCR detected FIV infection in PBMC cultures on average two days earlier.
Insights
A new polymerase chain reaction (PCR) method accurately detects feline immunodeficiency virus (FIV) in cat blood cells. This sensitive FIV detection in peripheral blood mononuclear cells (PBMC) offers earlier diagnosis compared to ELISA.
Area of Science:
- Veterinary Virology
- Molecular Diagnostics
- Immunology
Background:
- Feline immunodeficiency virus (FIV) is an important pathogen affecting domestic cats worldwide.
- Accurate and early detection of FIV is crucial for disease management and prevention.
- Current diagnostic methods may have limitations in sensitivity or speed.
Purpose of the Study:
- To develop and validate a specific and sensitive polymerase chain reaction (PCR) assay for FIV detection.
- To evaluate the performance of the PCR assay in detecting FIV in peripheral blood mononuclear cells (PBMC).
- To compare the diagnostic capabilities of the developed PCR assay with existing methods, such as ELISA.
Main Methods:
- Peripheral blood mononuclear cells (PBMC) were isolated from feline blood samples and cultures.
- PBMC underwent proteinase K digestion and heat inactivation for nucleic acid release.
- A two-step, nested PCR protocol was employed, targeting both gag and pol genes of FIV in a single tube.
Main Results:
- The developed PCR assay demonstrated high specificity, correctly identifying FIV in 6 of 14 seropositive cats.
- All 36 samples from seronegative cats tested negative, confirming the assay's specificity.
- The PCR method detected FIV infection in PBMC cultures an average of two days earlier than the antigen-capturing ELISA.
Conclusions:
- The developed nested PCR assay is a specific and sensitive tool for detecting FIV in feline PBMC.
- This PCR method offers an advantage in early FIV diagnosis compared to ELISA.
- The assay's ability to detect FIV earlier in PBMC cultures has significant implications for clinical diagnostics and research.