Association between SNPs in interferon regulatory factor 2 (IRF-2) gene and resistance to Aeromonas hydrophila in freshwater mussel Hyriopsis cumingii

作者：Wang, Guiling; Li, Xilei; Li, Jiale^*

来源：Fish & Shellfish Immunology, 2013, 34(5): 1366-1371.

DOI：10.1016/j.fsi.2013.02.006

• Hyriopsis cumingii
• IRF-2 gene
• Polymorphism
• Susceptibility/resistance
• Aeromonas hydrophila

Interferon regulatory factor 2 (IRF-2) is a multi-functional transcription factor in the IRF family exhibiting both transcriptional activating and repressing activities. In this study, an IRF-2 gene (HcIRF-2) from Hyriopsis cumingii was identified and characterized. The cDNA sequence consisted of 2688 bp, encoding a 329 amino acid-protein. The amino acid sequence had a highly conserved N-terminal DBD structure, containing characteristic repeats of six tryptophan residues. The 5'-flanking region contained several transcription regulation elements such as API, CdxA, HSF, NIT2 and HNF-3b. Nine SNPs were obtained through direct sequencing of HcIRF-2 from resistant and susceptible stock. Only +2365T/C SNP was significantly associated with resistance/susceptibility of H. cumingii to Aeromonas hydrophila both in genotype (P = 0.021) and allele (P = 0.006) analysis. The SNPs +2248T/C and +2365T/C were in high linkage disequilibrium, and haplotype analysis revealed that haplotype IT frequency in the resistant group was significantly higher than in the susceptible group. The mortality in +2248CC genotype individuals was significantly higher than in CT and TT genotype individuals. These results indicated that haplotype TT and genotype +2248CT and +2248GT individuals were resistant to A. hydrophila, which could make them potential markers in selective breeding of H. cumingii.

• 出版日期2013-5
• 单位上海海洋大学; 上海大学