Lack of expression of alpha or omega interferons by the horse conceptus.

The research investigates the expression of alpha or omega interferons in horse embryos, specifically revealing that these interferons do not accumulate in the horse conceptus.

Study Methodology

• Horse conceptuses, also known as embryos, were gathered at different stages; Days 13, 15, 20 and 25 post ovulation. Whole conceptuses were used for Days 13 and 15, while extra-embryonic membranes were used for Days 20 and 25.
• The acquired samples were crushed, and poly-adenylated RNA (poly A RNA), which is key in numerous biological processes, was isolated through binding to oligo (dT)-cellulose.
• Through a process known as northern blotting, the poly A RNA was then divided by size on a denaturing 1% agarose gel and transferred onto nitrocellulose filters. This technique is frequently employed for the detection of specific RNA sequences within a mixture of RNA.
• DNA probes were formed with the use of plasmids containing equine alpha 1, omega 1, and omega 2 interferons, and human beta actin. These probes facilitate in identifying the presence and quantity of RNA.

Evaluation and Results

• The process to detect the messenger RNA (mRNA), which translates genetic code from DNA into protein structures, implied specific hybridization (attachment) of radioactive 32P-cDNA probes tagged by random priming.
• Following the hybridization process at a specific temperature, the filters were cleansed and the heteroduplex bands of radioactive cDNA and mRNA were marked via autoradiography, a technique used to visualize radioactively labelled molecules.
• The existence of bands on the autoradiographs signified that the conditions and properties of the probes were suitable to support hybridization.
• The beta actin probe, utilized as a control, relatably bound to all mRNA tested on the northern blots, confirming the good quality of the mRNA. However, it is evident that the interferon probes (alpha and omega) did not attach to any mRNA. This signifies that no alpha or omega interferons were detected in the studied horse embryos or conceptuses.

Conclusion

• The research indicates that RNA similar to alpha or omega interferons does not accumulate or exist in significant amounts in horse conceptuses, giving insight into horse embryonic development and providing potential implications in equine reproductive science.