Molecular isolation and characterization of a spätzle gene from Macrobrachium rosenbergii

In this study, a spätzle gene of freshwater prawn, Macrobrachium rosenbergii (MrSpz) was isolated and characterized. The open reading frame of MrSpz consisted of 747 nucleotides encoding 248 amino acid residues containing a signal peptide and C-terminal spätzle activated domain. MrSpz shared high similarity to spätzle of Fenneropenaeus chinensis (FcSpz) at 92% identity and Marsupenaeus japonicus (MjSpz) at 83% identity. Phylogenetic analysis was performed and the results revealed that MrSpz was a member of the clade containing LvSpz3 of Litopenaeus vannamei, FcSpz and Penaeus monodon spätzle protein. The expression distribution at transcriptional level in various tissues of normal prawn revealed that the MrSpz was detected in gills, heart and hepatopancreas while no expression was obse...

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