title: Identification and characterization of an avian beta-defensin orthologue, avian beta-defensin 9, from quails.
abstract: In this study, a newly identified avian beta-defensin (AvBD) orthologue was isolated from Chinese painted quail (Coturnix chinensis) lung and bone marrow tissues. The complete nucleotide sequence of the gene contained a 204-bp open-reading frame encoding 67 amino acids. Homology, characterization, and comparison of the gene with AvBD from other avian species confirmed that it was quail AvBD9. To analyze and compare the expression pattern of AvBD9 in tissues from young and adult quails, layer hens, and broilers, reverse transcription polymerase chain reaction was performed using mRNA isolated from 21 different tissues. The AvBD9 expression pattern distribution was differed among quails of different ages, layer hens, and broilers. It was widely expressed in all the tissues except the trachea, liver, and kidney and was highly expressed in the lung and heart of young quails. Similarly, it was widely expressed in all the tissues of adult quails except for the liver, kidney, spleen, thymus, and Harderian gland. In layer hens, AvBD9 was widely expressed in all the tissues except the trachea, glandular stomach, and cecum. Similarly, it was widely expressed in all the tissues of broilers except for the trachea, glandular stomach, rectum, cecum, bone marrow, and cecal tonsil. Recombinant AvBD9 (rAvBD9) was produced and purified by expressing the gene in Escherichia coli. Additionally, peptide according to quail AvBD9 sequence was synthesized, named sAvBD9. As expected, both rAvBD9 and sAvBD9 exhibited strong bactericidal properties against 11 strains of bacteria, including Gram-positive and Gram-negative forms.
authors.affiliation: Institute of Animal Nutrition, Northeast Agricultural University, Harbin 150030, People's Republic of China.
authors.forename: Ruiqin
authors.initials: R
authors.lastname: Wang
authors.forename: Deying
authors.initials: D
authors.lastname: Ma
authors.forename: Lijuan
authors.initials: L
authors.lastname: Lin
authors.forename: Caiyuan
authors.initials: C
authors.lastname: Zhou
authors.forename: Zongxi
authors.initials: Z
authors.lastname: Han
authors.forename: Yuhao
authors.initials: Y
authors.lastname: Shao
authors.forename: Wenyan
authors.initials: W
authors.lastname: Liao
authors.forename: Shengwang
authors.initials: S
authors.lastname: Liu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D001717:Birds / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D003370:Coturnix; D005260:Female; D008297:Male; D008969:Molecular Sequence Data; D010802:Phylogeny; D011784:Quail / Q000235:genetics* / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D023083:beta-Defensins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D023083:beta-Defensins