Detection of swine transmissible gastroenteritis coronavirus using loop-mediated isothermal amplification

Area of Science:

• Veterinary Virology
• Molecular Diagnostics
• Coronaviruses

Background:

• Swine Transmissible Gastroenteritis Coronavirus (TGEV) causes significant economic losses in the swine industry.
• Accurate and rapid diagnostic methods are crucial for controlling TGEV outbreaks.
• Existing diagnostic techniques may lack the required sensitivity or specificity.

Purpose of the Study:

• To develop a novel, highly sensitive, and specific diagnostic assay for TGEV detection.
• To establish a Loop-mediated isothermal amplification (LAMP) method for TGEV RNA quantification.
• To compare the sensitivity and specificity of the developed LAMP assay with conventional PCR methods.

Main Methods:

• Design of specific primers targeting a conserved region of the TGEV nucleocapsid gene.
• Optimization of Loop-mediated isothermal amplification (LAMP) conditions (60°C for 1 hour).
• Confirmation of amplification product specificity using HphI digestion and SYBR Green I for real-time detection and quantification.

Main Results:

• Successful development of a LAMP assay for TGEV detection.
• The assay demonstrated high specificity, with no cross-reactivity observed with other tested viruses.
• The detection limit of the LAMP assay was determined to be approximately 10 pg RNA, showing a 10-fold increase in sensitivity compared to PCR.
• Accurate standard curves for TGEV RNA quantification were established.

Conclusions:

• The developed LAMP assay is a highly specific and sensitive tool for TGEV detection and quantification.
• This method offers a significant improvement in sensitivity over traditional PCR, comparable to nested-PCR.
• The LAMP assay provides a rapid and reliable alternative for TGEV diagnosis in veterinary settings.