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菲律宾蛤仔(Venerupis philippinarum)在苯并(a)芘胁迫下差异基因的筛选与分子生物标志物的研究
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摘要
本文根据目前我国近海多环芳烃污染现状,以近海养殖重要经济贝类菲律宾蛤仔(Venerupis philippinarum)为研究对象,克隆了菲律宾蛤仔芳烃受体介导的解毒代谢途径几种关键基因,包括芳烃受体蛋白(AhR)、芳烃受体核转位因子(ARNT)、热休克蛋白90(HSP90)。研究了毒性最强的多环芳烃(PAHs)——苯并(a)芘(BaP)对菲律宾蛤仔组织解毒代谢相关基因的表达调控规律,通过对在BaP胁迫下菲律宾蛤仔解毒代谢相关基因的克隆及基因表达分析,探究双壳贝类PAHs解毒代谢机制;构建了菲律宾蛤仔PAHs消减cDNA文库,筛选、鉴定了差异表达基因,结合室内实验和海区现场验证,初步建立了基于菲律宾蛤仔的PAHs分子生物标志物监测技术,为海洋环境污染监测和水产品安全评价提供基础数据和技术支持。
     1菲律宾蛤仔芳烃受体(AhR)介导的关键基因克隆与表达分析
     菲律宾蛤仔芳烃受体蛋白(VpAhR)的cDNA全序列长2870bp,开放阅读框(ORF)长为2391bp,共编码796个氨基酸残基,不具备信号肽,属于胞内蛋白,含有2个核定位序列(NLS):K45RRRR49和P67SKRHRE73。BLAST分析表明VpAhR与其它物种AhR基因具有较高的同源性。VpAhR含有1个碱性螺旋-环-螺旋结构(bHLH domain)和2个配体结合区(PAS domain),属于bHLH-PAS转录因子家族。序列分析显示,VpAhR的配体结合区(a.a.220–383)与砂海螂(M. arenaria)和斑马纹贻贝(D. polymorpha)AhR的配体结合区相似性很高。实时定量PCR分析表明VpAhR在菲律宾蛤仔的鳃、消化盲囊、外套膜和闭壳肌中均有表达,鳃组织中表达量最高。
     菲律宾蛤仔ARNT片段长485bp,编码161个氨基酸残基,该序列含一个由44个氨基酸构成的PAS结构域(a.a.7-50),该区域与其他物种ARNT的PAS结构域相似性较高;VpARNT在菲律宾蛤仔消化盲囊中表达最高,在鳃、外套膜和闭壳肌中也均有分布。HSP90是分子伴侣家族的重要一员,菲律宾蛤仔的HSP90基因片段cDNA长687bp,编码299个氨基酸,具有HSP90家族保守信号区(GVVDSEDLPLNISRE),与其他物种HSP90氨基酸序列具有很高相似性,与栉孔扇贝(C. farreri)和海湾扇贝(A. irradians)的相似性均为99%,菲律宾蛤仔HSP90在鳃组织中表达量最高;不同浓度BaP(0.01、0.2μg/L)染毒处理3d、10d,菲律宾蛤仔鳃组织中AhR、ARNT、HSP90和谷胱甘肽硫转移酶(GSTpi)的基因表达水平随染毒浓度增大和处理时间延长而逐渐升高;除10d时0.2μg/L组细胞色素P4504(CYP4)基因表达被极显著(P<0.01)上调外,其余处理组CYP4mRNA表达水平在染毒期间与对照组差异不显著(P>0.05)。实验结果表明,BaP与AhR介导的菲律宾蛤仔解毒代谢相关基因AhR、ARNT、HSP90和GSTpi的mRNA表达具有明显的剂量—效应关系,符合生物标志物筛选原则,适于进行进一步的分析和现场验证。
     2菲律宾蛤仔在苯并(a)芘胁迫下cDNA消减文库的构建与分析
     利用抑制性消减杂交技术(SSH)构建了BaP(1μg/L)胁迫下菲律宾蛤仔正、反向cDNA消减文库,分别获得194个和93个重组克隆,测序分析显示,正、反向文库分别得到168个和83个EST序列,经同源序列相似性比对,正向cDNA文库中有31种基因与已知功能基因具有较高同源性,12种为假定蛋白,2种为未知蛋白;反向文库中已知功能基因10种,假定蛋白4种。所有ESTs序列信息均已提交Genbank数据库,cDNA消减文库编号为LIBEST_027169。进一步序列比对、功能注释及分类显示,通过SSH筛选到的菲律宾蛤仔差异表达基因主要为药物代谢、杂环化合物代谢、细胞分解代谢、抗生素响应等代谢过程相关基因。
     3菲律宾蛤仔在苯并(a)芘胁迫下分子生物标志物的筛选与验证
     设置一系列BaP染毒浓度(0.25、1和4μg/L),利用实时定量PCR检测染毒处理10d时菲律宾蛤仔解毒代谢相关基因、SSH-selected差异表达基因及几种其他功能基因的mRNA表达。结果显示,测定的28种基因中Defensin、Serine protease、Thioesterprotein、GST C、Mn-SOD、ARNT等12种基因被BaP诱导表达上调,且与染毒浓度呈线性正相关关系,因此适于作为潜在的分子生物标志物进行进一步研究与验证。
     在胶州湾和胶南附近海域各选择一个实验站点(S1和S2),于2011年12月采集各站点表层海水及菲律宾蛤仔样品。高效液相色谱法(HPLC)测定海水中PAHs含量和菲律宾蛤仔软体部中PAHs的累积量。结果显示,S1站点海水和菲律宾蛤仔组织中的总PAHs和BaP含量均高于S2站点;实时定量PCR分析表明,除HSP90和AhR外,PAHs含量较高的S1站点的其余10种分子生物标志物基因表达水平明显高于S2站点,表现出一定的剂量—效应关系。由此表明,菲律宾蛤仔12种基因基本符合生物标志物筛选原则,适于作为分子生物标志物用于海洋环境PAHs污染监测及毒性效应评估。
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental contaminantsand the environmental PAHs concentrations have been increasing particularly in aquaticenvironment. In present study, the toxic effect of benzo(a)pyrene (BaP) on clam Venerupisphilippinarum was studied and the molecular biomarkers were selected for PAHs pollutionassessment. The key genes of aryl hydrocarbon receptor (AhR)-mediated detoxificationmechanism, including AhR, aryl hydrocarbon receptor nuclear translocator (ARNT) and heatshock protein90(HSP90) were cloned and the effects of BaP on gene expression was studied inorder to explore the mechanism of detoxification of the clam. A subtracted cDNA library ofVenerupis philippinarum exposed to BaP was constructed by suppression subtractivehybridisation (SSH) for identification of differential expression genes. The molecular biomarkersof clam were selected and confirmed by analysis of gene expression. The resulting data mayprovide basic genomic information of the bivalve and the useful technology of biomonitoring ofPAHs by bivalves was supplied for PAHs pollution in aquatic environment.
     1Cloning and expression of the key genes of aryl hydrocarbon receptor (AhR)-mediateddetoxication mechanism of Venerupis philippinarum exposed to benzo(a)pyrene
     The full-length VpAhR cDNA is2870bp, containing an open reading frame (ORF) of2391bp which encoded a polypeptide of796amino acids. The predicted amino acidsequences contain regions characteristic of AhRs from other species including basichelix-loop-helix (bHLH) and Per-ARNT-Sim (PAS) domains. Two nuclear translocationsequences can be identifed in the VpAhR sequence. Blast analysis showed that the deducedamino acid sequence of VpAhR shared high identity with other AhRs. The clam AhR mRNAexpression was detected in all the adult tissues tested (gill, digestive gland, adductor muscle andmantle) and highest transcription level was observed in gill compared to other tissues.
     The partial length VpARNT cDNA is485bp, containing an ORF of2391bp. The ORF encode a peptide of161amino acids. The predicted amino acid sequences contain a PAS domainwhich has a high identity with other species’ PAS domains. VpARNT mRNA expression wasdetected in all the adult tissues and the highest transcription level was observed in digestive gland.HSP90was an important member of molecular chaperone family. The cDNA partial length ofVpHSP90is687bp which is coding a peptide of299amino acids. An HSP90family conservedsignal region (GVVDSEDLPLNISRE) was detected in VpHSP90and it has a high identity withother species’ HSP90, such as C. farreri and A. irradians. The highest mRNA expression ofVpHSP90was detected in gill.
     Clams were exposed to different concentrations of BaP (0.01and0.2μg/L) for10d. Thegene expression of AhR, ARNT, HSP90and GST were increased with the enhancement ofBaP concentration and prolong of the experimental period, while there was no significantdifference of CYP4gene expression between control and BaP treatments. The potentialmolecular biomarkers were selected for further study.
     2Construction and analysis of subtractive cDNA library of Venerupis philippinarumexposed to benzo(a)pyrene
     Forward and reverse subtracted cDNA library of Venerupis philippinarum exposed to BaPwere constructed. One hundred and ninety-four and ninety-three recombinants were collectedseparately from forward and reverse subtracted cDNA library. Thirty-one unigenes and twelvehypothetical proteins were identified from forward cDNA library and there were ten unigenesand four hypothetical proteins in reverse cDNA library. The cDNA library accession number ofthe clam is LIBEST_027169. Analysis of multiple alignment and annotation showed that most ofthe SSH-selected genes were related to drug metabolic process, heterocycle metabolic process,cellular catabolic process, amine metabolic process, cellular nitrogen compound metabolicprocess and response to antibiotic.
     3Screening and confirmation of molecular biomarkers of Venerupis philippinarumexposed to benzo(a)pyrene
     A BaP (0.025,1and4μg/L) exposure for10d was conducted and the gene expression ofAhR related genes, SSH-selected genes and some functional genes of clam were tested by realtime quantitative PCR. Results showed that mRNA expression of twelve genes includingDefensin、Serine protease、Thioester protein、GST C、Mn-SOD、ARNT et al., wereup-regulated by BaP exposure and there was a significant linear relationship between BaP concentration and the gene expression, which indicated that these genes were suitablemolecular biomarkers of clam for PAHs assessment.
     Two sampling sites were selected according to the different PAHs pollution situation of thesea areas in Jiaozhou Bay and Dragon Bay. The PAHs contents of surface seawater and tissue ofclam and gene expression of biomarkers of clam sampled from different sites were analyzed.Results showed that the contents of total PAHs and BaP were higher in S1than S2. The geneexpression level of clams collected from S1was higher than S2which is similar to the results oflaboratory expreiment. It is indicated that the twelve genes were suitable molecular biomarkersfor PAHs pollution assessment.
引文
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