淡水渔业
淡水漁業
담수어업
FRESHWATER FISHERIES
2014年
1期
20-25,58
,共7页
李春涛%蒋自立%曾伯平%张其中
李春濤%蔣自立%曾伯平%張其中
리춘도%장자립%증백평%장기중
大鳍鳠( Mystus macropterus)%IgL2基因cDNA%克隆%实时荧光定量PCR%表达
大鰭鳠( Mystus macropterus)%IgL2基因cDNA%剋隆%實時熒光定量PCR%錶達
대기화( Mystus macropterus)%IgL2기인cDNA%극륭%실시형광정량PCR%표체
My stus macropterus%IgL2 gene cDNA%clone%real-time PCR%expression
应用RT和RACE-PCR方法获得大鳍鳠(Mystus macrpoterus Bleeker)免疫球蛋白轻链(IgL)2型基因cDNA序列,分析了该基因在组织中的表达。该基因cDNA全长为929 bp,包含5'非编码区43 bp,3'非编码区159 bp,开放阅读框720 bp,编码239个氨基酸。编码的氨基酸序列分为可变区( VL)和恒定区( CL)。系统进化树分析显示,大鳍鳠IgL蛋白质序列与斑点叉尾 IgL 2型( G型)合为一支,与其它硬骨鱼类IgL2型聚为一簇。组织分布研究表明,大鳍鳠IgL2基因表达量在脾脏最高,其次是鳃和头肾,这明显与大鳍鳠IgL3型基因表达方式不同。注射嗜水气单胞菌后,大鳍鳠IgL2基因转录表达量在脾脏、鳃和头肾都随时间发生变化。 IgL2基因转录表达量在脾脏4 d就到达高峰,在鳃1 d就达到峰值。这些应答规律与IgL3基因差异显著,推测, IgL2的表达主要参与鳃、肠和皮肤主导的粘膜免疫。
應用RT和RACE-PCR方法穫得大鰭鳠(Mystus macrpoterus Bleeker)免疫毬蛋白輕鏈(IgL)2型基因cDNA序列,分析瞭該基因在組織中的錶達。該基因cDNA全長為929 bp,包含5'非編碼區43 bp,3'非編碼區159 bp,開放閱讀框720 bp,編碼239箇氨基痠。編碼的氨基痠序列分為可變區( VL)和恆定區( CL)。繫統進化樹分析顯示,大鰭鳠IgL蛋白質序列與斑點扠尾 IgL 2型( G型)閤為一支,與其它硬骨魚類IgL2型聚為一簇。組織分佈研究錶明,大鰭鳠IgL2基因錶達量在脾髒最高,其次是鰓和頭腎,這明顯與大鰭鳠IgL3型基因錶達方式不同。註射嗜水氣單胞菌後,大鰭鳠IgL2基因轉錄錶達量在脾髒、鰓和頭腎都隨時間髮生變化。 IgL2基因轉錄錶達量在脾髒4 d就到達高峰,在鰓1 d就達到峰值。這些應答規律與IgL3基因差異顯著,推測, IgL2的錶達主要參與鰓、腸和皮膚主導的粘膜免疫。
응용RT화RACE-PCR방법획득대기화(Mystus macrpoterus Bleeker)면역구단백경련(IgL)2형기인cDNA서렬,분석료해기인재조직중적표체。해기인cDNA전장위929 bp,포함5'비편마구43 bp,3'비편마구159 bp,개방열독광720 bp,편마239개안기산。편마적안기산서렬분위가변구( VL)화항정구( CL)。계통진화수분석현시,대기화IgL단백질서렬여반점차미 IgL 2형( G형)합위일지,여기타경골어류IgL2형취위일족。조직분포연구표명,대기화IgL2기인표체량재비장최고,기차시새화두신,저명현여대기화IgL3형기인표체방식불동。주사기수기단포균후,대기화IgL2기인전록표체량재비장、새화두신도수시간발생변화。 IgL2기인전록표체량재비장4 d취도체고봉,재새1 d취체도봉치。저사응답규률여IgL3기인차이현저,추측, IgL2적표체주요삼여새、장화피부주도적점막면역。
RT-PCR and Rapid Amplification of cDNA Ends ( RACE) PCR was used to amplify cDNA of immunoglobulin light chain 2 isotype (IgL2) gene from catfish.IgL2 in Myts us macropterus had 929 nucleotides, including 5′-UTR of 43 nucleotides, 3′-UTR of 159 nucleotides and an open reading frame with 720 nucleotides encoding a peptide of 239 amino acids.The deduced amino acid sequence consisted of an constant region ( CL) and a variable domain ( VL).Phylogenetic tree based on some fish IgL amino acids showed that IgL 2 in M.macropterus was clustered closely with that ( G ) of I.Punctatus.The study on tissue distribution showed that IgL 2 mRNA expression of M.macropterus was mainly detected in spleen,gill and head kidney and increased significantly in these tissues after injection of Aeromonas hydrophila.IgL2 tran-scription level peaked on the4 th day in spleen and on the ist day in gill after bacterin immunization , which was different from that of IgL3 in M.macropterus.The result indicated that IgL2 played a critical role in immunity interaction of mucosa-associated lymphoid tissue ( MALT) in M.macropterus.