title: Molluskan fasciclin-1 domain-containing protein: molecular characterizationand gene expression analysis of fasciclin 1-like protein from disk abalone (Haliotis discus discus).
abstract: Cell-to-cell contacts play a key role in multicellular systems and organisms. Fasciclin-1 (FAS-1) is a lipid-linked membrane associated glycoprotein that is a member of a newly recognized family of cell adhesion molecules sharing features with the immunoglobulins, cadherins, integrins, and selectins. Here, we report the identification and molecular characterization of a novel FAS-1 domain-containing cDNA from disk abalone (Haliotis discus discus), including its gene expression profile and immune response to bacterial stimuli and tissue injuries. Designated as Abfac1, the 909bp open reading frame (ORF) encodes 303 amino acid (aa) residues with a predicted molecular mass of 33kDa and isoelectric (pI) value of 4.9. The aa sequence contains two FAS-1 domains and three conserved regions, FRa motif, H-box, and FRb motif. Phylogenetic analysis showed the closest relation to Jellyfish cell adhesion protein. In healthy abalone, Abfac1 expression is highest in hepatopancreas followed by mantle and lowest in digestive gland. In immune-stimulated abalones, relative Abfac1 mRNA expression was increased in hemocytes by ~11-fold at 48h after the Vibrio parahaemolyticus infection, by 3.1-fold at 6h after the Listeria monocytogenes infection and by ~9-fold at 6h after the LPS injection. Similarly, tissue injuries caused significant increase of relative mRNA expression by 3.5-fold in hemocytes and by ~10-fold in mantle at 12h post-injury. These results suggest that the novel member of the FAS-1 domain-containing protein family, Abfac1, may be involved in immune response and cell adhesion in disk abalone.
authors.affiliation: Department of Marine Life Sciences, School of Marine Biomedical Science, Jeju National University, Jeju Special Self-Governing Province 690-756, Republic of Korea.
authors.forename: H K A
authors.initials: HK
authors.lastname: Premachandra
authors.forename: Mahanama
authors.initials: M
authors.lastname: De Zoysa
authors.forename: Chamilani
authors.initials: C
authors.lastname: Nikapitiya
authors.forename: Youngdeuk
authors.initials: Y
authors.lastname: Lee
authors.forename: W D N
authors.initials: WD
authors.lastname: Wickramaarachchi
authors.forename: Ilson
authors.initials: I
authors.lastname: Whang
authors.forename: Jehee
authors.initials: J
authors.lastname: Lee
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002448:Cell Adhesion; D015816:Cell Adhesion Molecules, Neuronal / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D049851:Gastropoda / Q000235:genetics* / Q000276:immunology / Q000378:metabolism / Q000382:microbiology; D015870:Gene Expression; D006434:Hemocytes / Q000378:metabolism; D008089:Listeria monocytogenes; D008969:Molecular Sequence Data; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D014736:Vibrio parahaemolyticus / Q000502:physiology
chemical_list: D015816:Cell Adhesion Molecules, Neuronal; D012333:RNA, Messenger; C051641:fasciclin I