title: GATA3 mRNA in ginbuna crucian carp (Carassius auratus langsdorfii): cDNA cloning, splice variants and expression analysis.
abstract: GATA3, a transcriptional activator, plays a critical role in the development of T-cells and differentiation to T helper type 2 cells. To date, no information is available on the role of GATA3 in the teleost immune system. We identified full-length cDNA and alternatively spliced variants of ginbuna crucian carp GATA3 (gbGATA3). The gbGATA3 gene is transcribed into multiple splice variants lacking either one or both zinc finger domains, although the sequences of both domains are fully conserved between ginbuna and other vertebrates. We found that alternative splice site and stop codon in gbGATA3 intron 3, located between exons that separately encode the two zinc finger domains, are conserved among teleosts, suggesting that teleost GATA3 gene can be translated into multiple isoforms. RT-PCR analysis revealed that the gbGATA3 is strongly expressed in the brain, thymus and gill of unstimulated fish. Moreover, gbGATA3 expression was detected in surface-IgM-negative lymphocytes among kidney cells sorted by FACS. Real-time PCR demonstrated that expression levels of full-length gbGATA3 and the splice variants differed with tissue type, but full length was always the predominantly expressed form. These results suggest that gbGATA3, including its splice variants, is involved in teleost T-cell function.
authors.affiliation: Laboratory of Fish Pathology, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan.
authors.forename: Fumio
authors.initials: F
authors.lastname: Takizawa
authors.forename: Yuha
authors.initials: Y
authors.lastname: Mizunaga
authors.forename: Kyosuke
authors.initials: K
authors.lastname: Araki
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Moritomo
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Ototake
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Nakanishi
mesh_terms: D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D050990:GATA3 Transcription Factor / Q000235:genetics*; D006054:Goldfish / Q000276:immunology*; D007438:Introns; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis*; D016335:Zinc Fingers
chemical_list: D050990:GATA3 Transcription Factor; D012333:RNA, Messenger