Angular limb deformity associated with TSPAN18, NRG3 and NOVA2 in Rambouillet rams

Area of Science:

• Genetics
• Animal Science
• Veterinary Medicine

Background:

• Angular limb deformity (ALD) is a prevalent condition in livestock and companion animals.
• The underlying mechanisms of ALD are not fully understood, but genetic factors are suspected.
• Rambouillet sheep are known to be predisposed to ALD development.

Purpose of the Study:

• To investigate the genetic basis of angular limb deformity (ALD) in Rambouillet sheep.
• To identify potential genetic risk factors associated with ALD and osteochondrosis.

Main Methods:

• A case-control genome-wide association study (GWAS) was performed using 40 ALD-affected and 302 unaffected Rambouillet rams.
• 40,945 single nucleotide polymorphisms (SNPs) were analyzed.
• Functional consequences of significant SNPs were evaluated using transcription factor binding site analysis.

Main Results:

• Significant SNPs were located within or near genes TSPAN18, NRG3, and NOVA2.
• These genes are implicated in angiogenesis and the proliferation/differentiation of bone and cartilage cells.
• Transcription factor binding site analysis predicted binding sites for key bone growth regulators (SOX6, SOX9, RUNX2).

Conclusions:

• Genes TSPAN18, NRG3, and NOVA2 are proposed as potential contributors to the pathogenesis of ALD and osteochondrosis in Rambouillet sheep.
• Identifying these genetic risk factors could aid in improving animal welfare and production.
• Further research into these genes is warranted to elucidate the etiology of ALD.