Abstract
High mobility group box 1 (HMGB1) and high mobility group box 2 (HMGB2) were highly conserved nonhistone chromosomal proteins involved in DNA damage repair, innate immune and inflammatory response. In this study, Acipenser baerii HMGB1 (AbHMGB1) and HMGB 2 (AbHMGB2) were identified. The open reading frame (ORF) of AbHMGB1 was 621 bp which encoded 206 amino acids, and the ORF of AbHMGB2 was 630 bp encoded 209 amino acids. AbHMGB1 and AbHMGB2 were conserved compared with bony fish by phylogenetic analyzing. qRT-PCR showed that AbHMGB1 and AbHMGB2 were expressed in all examined tissues, AbHMGB1 was expressed abundantly in muscle, followed by head kidney and brain, and AbHMGB2 was highest expressed in gill, followed by brain and muscle. After Streptococcus iniae infection and PAMPs treatment, AbHMGB1 and AbHMGB2 were induced significantly. This study indicated that AbHMGB1 and AbHMGB2 are involved in the process of pathogenic infection and provided a basis for exploring the mechanism of Acipenser baerii enteritis induced by Streptococcus iniae.
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