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Background   Psoroptes ovis  var.  cuniculi  is a common ectoparasite of wild and domestic rabbits worldwide that causes economically devastating losses in commercial rabbit husbandry and significantly affects the overall health of rabbits. Serine proteinase inhibitor (serpin) is present in almost all organisms that are involved in host–pathogen interactions, inflammatory responses, and reproductive development, among others. However, very little research has been carried out on  P. ovis  var.  cuniculi  serpins.    Methods  Two serpin genes of  P. ovis  var.  cuniculi  (Pso c 27 and PsoSP2 cDNAs) were cloned and molecularly characterized. The transcriptional profiles and tissue localization of these two serpins in  P. ovis  var.  cuniculi  were investigated by quantitative real-time PCR and immunohistochemistry, respectively. The potential function of recombinant Pso c 27 and PsoSP2 (rPso c 27 and rPsoSP2) in the serodiagnosis of  P. ovis  var.  cuniculi  infestation in rabbits was evaluated using a newly devleoped indirect enzyme-linked immunosorbent assay.    Results  Both the 523-residue Pso c 27 and the 240-residue PsoSP2 proteins contained typical serpin domains and signatures. Both Pso c 27and PsoSP2 cDNAs were expressed throughout the life-cycle; specifically, the cDNAs showed significantly higher expression in female mites than in larva, nymph, and male mites (Pso c 27:  F  (3, 8)  = 1935.953,  P  < 0.0001; PsoSP2:  F  (3, 8)  = 660.669,  P  < 0.0001). The native Pso c 27 and PsoSP2 proteins localized in the ovary and mouthparts of adult female mites, respectively. Compared to rPsoSP2, rPso c 27 showed better diagnostic efficiency, with higher values of sensitivity, specificity, and area under the receiver operating characteristic curve (rPso c 27  vs  rPsoSP2: 96.0  vs  90.0%; 90.91  vs  78.18%; 0.988  vs  0.964, respectively). Moreover, rPso c 27 showed seropositivity in 80% of the rabbits as early as the 2 weeks post-infestation, prior to visible clinical signs and microscopy-positive of skin scrapings.    Conclusions  These results suggest that these two serpins may play essential roles in reproductive development, serum-feeding, and pathogenicity of  P. ovis  var.  cuniculi . Compared to PsoSP2, Pso c 27 appears to be a potential antigen for serodiagnosis of  P. ovis  var.  cuniculi  infestation in rabbits, especially at the early stage of infestation.

Molecular characterization and serodiagnostic potential of two serpin proteins in Psoroptes ovis var. cuniculi