| Summary: | The interferon-related developmental regulator 1 (IFRD1) protein is expected to play a role in the regulation of inflammatory responses in adult mice, since it is known to repress transcription of NF-κB in myoblasts that regenerate skeletal muscle after traumatic injury Micheli et al., 2011. The IFRD2 gene is expressed in many tissues including skeletal muscle, kidney, heart, brain, lung, placenta and liver in adult humans and is highly expressed in adult human skeletal muscle and heart. In mice, interferon-related developmental regulator 2 (IFRD2) may be associated with early haematopoiesis after gastrulation and in the hepatic primordium Buanne et al., 1998. In this study, we analysed the molecular characteristics of the IFRD2 gene identified from Pagrus major (PmIFRD2) and performed multiple alignments and phylogenetic analyses of the protein sequence. In addition, we examined the expression pattern of IFRD2 in healthy red sea bream tissues and the temporal expression pattern after challenging with various pathogens [Edwardsiella piscicida (E. piscicida), Streptococcus iniae (S. iniae) and red sea bream iridovirus (RSIV)]. This study characterises the non-specific immune response of the red sea bream after viral and microbial infections. Keywords: Interferon-related developmental regulator 2 (IFRD2), Red sea bream, Edwardsiella piscicida, Streptococcus iniae, Red sea bream iridovirus (RSIV)
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