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Article Abstract
The highly polymorphic swine leukocyte antigen (SLA) genes have been repeatedly shown to influence swine immune traits, disease resistance, vaccine responsiveness and tumour penetrance. Analysis of the SLA diversity in as many pig breeds as possible is important to clarify the relationships between SLA genes and diseases or traits, and develop these pigs as valuable animal models for biomedical research. The Chinese Bama miniature pig breed is an economically significant breed that is available at several research institutions in China. In this study, we identified a total of 32 alleles at five polymorphic SLA loci (SLA-1, SLA-3, SLA-2, DRB1 and DQB1) representing nine class I and seven class II haplotypes using the reverse transcription polymerase chain reaction (RT-PCR) sequence-based typing (SBT) method. The possible functional sites of the SLA genes were predicted and analyzed by comparison with those of the human and mouse. Based on the sequence information, we subsequently developed a rapid PCR-based typing assay using sequence-specific primers (PCR-SSP) to efficiently follow the SLA types of the progeny. In the studied cohort (2n = 562), the most prevalent Haplotype Hp-35.6 (SLA-1(∗)1201, SLA-1(∗)1301-SLA-3(∗)0502-SLA-2(∗)1001-DRB1(∗)0501-DQB1(∗)0801) was identified in 182 Bama pigs with a frequency of 32.38%. The presence of the duplicated SLA-1 locus was confirmed in five of the class I haplotypes. Moreover, we identified two crossovers within the class I region and one between the class I and class II regions, which corresponded to recombination frequencies of 0.36% and 0.18%, respectively. The information of this study is essential for an understanding of the SLA allelic architecture and diversity, and it will be helpful for studying the adaptive immune response and further developing the more effective vaccines in the context of SLA specificities.
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