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Characterization of the ScghC1q-1 gene in Sinonovacula constricta and its role in innate immune responses

Li, Yan, Niu, Donghong, Bai, Yuqi, Lan, Tianyi, Peng, Maoxiao, Dong, Zhiguo, Li, Jiale
Developmental and comparative immunology 2019 v.94 pp. 16-21
Gram-negative bacteria, Staphylococcus aureus, Veneroida, Vibrio anguillarum, amino acids, complement, gene expression regulation, genes, hemolymph, immune response, innate immunity, messenger RNA, open reading frames, tissues
C1q is an important immune gene that can mediate a variety of immune regulatory functions, and is involved in complement pathway activation. In the present study, a ghC1q gene from the razor clam Sinonovacula constricta was identified and named ScghC1q-1. The complete ScghC1q-1 gene is 692 bp in length, with an open reading frame (ORF) of 489 bp encoding a protein of 162 amino acids. ScghC1q-1 mRNA was widely expressed in various tissues, and transcript levels in the hemolymph were significantly up-regulated following Staphylococcus aureus or Vibrio anguillarum challenge. Recombinant ScghC1q-1 protein was found to agglutinate both Gram-positive and Gram-negative bacteria. These results indicate that ScghC1q-1 plays an essential role in the immune defense of S. constricta.