Analysis of gene polymorphisms and disease association is essential for assessing putative candidate genes affecting susceptibility or resistance to disease. In this paper, we report the results of an association analysis between single nucleotide polymorphisms (SNPs) in common carp (Cyprinus carpio) innate immune response genes and resistance to cyprinid herpesvirus. -3 (CyHV. -3) infection. Twenty. -three SNPs from 14 genes were genotyped in the progeny of a full. -sib family, which was subjected to a CyHV. -3 challenge. The challenge was carried out by cohabitation of naïve fish with CyHV. -3. -infected fish and the experimental fish subsequently were scored as susceptible or resistant. Fisher exact probability and chi. -square tests were used to assess the association of SNP genotypes or alleles with CyHV. -3 resistance. No association between SNPs in common carp immune response genes and resistance to CyHV. -3 was found, except for SNPs in IL-10a. For IL-10a, both heterozygous and homozygous fish carrying the GCG haplotype were more susceptible to CyHV. -3 infection (P<. 0.001). To identify the source of susceptible and resistant alleles, we genotyped fish from the parental common carp strains. We found that the susceptible allele was more common among fish from the wild CyHV. -3. -resistant strain (Sassan) whereas the resistant allele was found in all the fish sampled from the susceptible domesticated strain (Našice). The implications of our findings to the development of a domesticated CyHV. -3. -resistant stock through marker. -assisted selection or gene. -introgression, and the possible impact of the IL-10a polymorphisms we identified on susceptibility to CyHV. -3 infection in common carp are discussed.
Bibliographical noteFunding Information:
This study was supported by a grant from the US–Israel Binational Agricultural Research and Development Fund (BARD Project No. IS-3997-07 ). P.K. was also supported by a Royal Thai Government doctoral scholarship. E.H. is supported by Virginia Agricultural Experimental Station through the USDA-NIFA Hatch Program. We thank Kristy Shewbridge, Roseanna Long and Brian Smith for their technical assistance. We also thank Dr. Roger Vallejo and Dr. Gregory Wiens for their help and guidance with data analysis and protein modeling, and Dr. Maureen Purcell for reviewing the manuscript draft. The mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.
- Common carp, Cyprinus carpio
- Cyprinid herpesvirus-3
- Disease resistance
- Innate immune response
- Marker-assisted breeding
- Single nucleotide polymorphisms