Identification and tissue expression analysis of C-type lectin and galectin in the Pacific oyster, Crassostrea gigas

Kunihiro Yamaura, Keisuke G. Takahashi, Toru Suzuki

Research output: Contribution to journalArticlepeer-review

91 Citations (Scopus)


As an initial step in the functional analysis of lectins in the Pacific oyster, Crassostrea gigas, we attempted to obtain the full coding sequences of C. gigas lectins and conduct tissue expression analyses. To obtain lectin genes quickly, we identified C. gigas expressed sequence tags that coded for lectins in GenBank, and selected three encoding partial sequences of C-type lectin 1 (CgCLec-1), galectin (CgGal) and fucolectin. We obtained full open reading frames of CgCLec-1 and CgGal cDNAs by RACE-PCR. CgCLec-1 is a typical C-type lectin with a signal peptide and C-type lectin domain. CgCLec-1 mRNA was expressed only in specialized basophilic cells involved with digestive enzyme secretion in the digestive gland, suggesting that CgCLec-1 is secreted into the lumen of the digestive diverticula. CgGal is a prototype galectin with a single galactose-binding domain that was expressed in all of the tissues examined. As suggested for vertebrate galectin-1 (prototype galectin), CgGal may function in general cell activities such as cell adhesion. Fucolectin in C. gigas was expressed specifically in the gonads, indicating a possible function in gonadal development. CgCLec-1 and CgGal expression in hemocytes was not upregulated after injecting Vibrio tubiashii into adductor muscle, suggesting that bacterial infection does not induce synthesis of these lectins. Of the three lectins examined, CgCLec-1 is an interesting target for future investigations of innate immunity in the digestive system of C. gigas.

Original languageEnglish
Pages (from-to)168-175
Number of pages8
JournalComparative Biochemistry and Physiology - B Biochemistry and Molecular Biology
Issue number1
Publication statusPublished - 2008 Jan


  • C-type lectin
  • Crassostrea gigas
  • Digestive gland
  • Galectin
  • In situ hybridization
  • Oyster

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology


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