Gene expression profiling on sheep brain reveals differential transcripts in scrapie-affected/not-affected animals

Area of Science:

• Neuroscience
• Genetics
• Veterinary Medicine

Background:

• Scrapie is a fatal prion disease affecting sheep's central nervous system.
• Identifying specific biomarkers for early diagnosis of scrapie is crucial for disease management.

Purpose of the Study:

• To identify novel genes in the sheep central nervous system that indicate scrapie infection.
• To explore potential genetic markers for scrapie diagnosis.

Main Methods:

• Subtractive Suppressive Hybridization (SSH) technique was employed.
• Brain samples from healthy and scrapie-affected sheep were analyzed.
• Differential gene expression was identified through cloning and sequencing.

Main Results:

• Six genes were identified: COX1, CHN1, PPP2CA, LRFN5, CAMK2A, and RABEPK.
• CHN1 and RABEPK are located within a quantitative trait loci (QTL) region influencing prion disease incubation time.
• LRFN5 maps to a sheep-specific QTL region associated with scrapie.
• CHN1 and RABEPK exhibited previously unreported differential splicing patterns.

Conclusions:

• The identified genes, particularly CHN1, RABEPK, and LRFN5, show potential as biomarkers for scrapie infection in sheep.
• Differential splicing in CHN1 and RABEPK may play a role in scrapie pathogenesis.
• Further research into these genes could advance scrapie diagnostics and understanding of prion diseases.