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1.
《中国兽医学报》2015,(8)
18头肥育猪按饲粮均分为2组,添加红花籽油组和不添加油脂组(对照组)。试验期60d结束,全部屠宰,分别采集肝脏组织样品,进行高通量转录组测序,找出2处理组间的差异表达基因和差异代谢通路。利用Illumina HiSeqTM2500高通量RNA-seq测序技术对2组肥育猪肝脏RNA测序,使用TopHat2软件将测序得到的reads序列与猪(Sscrofa10.2)参考基因组序列比对,找出差异表达基因,在Nr、GO和KEGG数据库中进行功能注释、富集分析和聚类分析。结果显示,红花籽油组和对照组肝脏中差异表达基因共有1 114个,与对照组相比,红花籽油组表达上调的基因有579个,下调的基因有535个。GO功能分类注释到细胞组成、生物学过程和分子功能数据库中的差异表达基因分别有902,903,857个。注释到KEGG通路中差异表达基因414个,显著富集通路4个(P0.05)。 相似文献
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为探究高低海拔斑头雁肺脏差异表达基因和差异代谢通路的变化,基于Illumina NovaSeq 6000测序平台对斑头雁肺脏组织进行转录组测序,分析差异表达基因,利用荧光定量PCR对部分差异表达基因进行验证,进一步对差异表达基因进行GO功能富集分析和KEGG信号通路富集分析。结果:与高海拔组斑头雁肺脏相比,筛选出差异表达基因84个,其中上调差异表达基因51个,下调差异表达基因33个。经GO功能注释后富集到21个显著性GO功能,"生物过程"显著富集到11个条目,涉及代谢过程以及内源性刺激的应答等。"细胞组成"显著富集到1个条目,涉及到细胞外区域。"分子功能"显著富集到9个条目,涉及到酶活性、激素、转录因子、钠离子跨膜转运等。注释到KEGG的显著性富集通路有3条,涉及到糖胺聚糖降解通路、丝裂原活化蛋白激酶信号通路以及丙氨酸、天冬氨酸和谷氨酸代谢通路。本研究结果丰富了斑头雁的基因资源,为该物种海拔适应相关基因的功能研究奠定了基础。 相似文献
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牛源大肠杆菌O157：H7的分离及毒力基因鉴定 总被引：1，自引：0，他引：1
从2个牛场采集新鲜粪便,增菌后,免疫磁珠富集,涂布筛选性培养基,挑取可疑菌落用rfbE/fliC二重PCR和血清学方法鉴定。设计毒力基因stx1、stx2、eae、hlyA和tccp相应引物,针对O157：H7对分离株进行PCR鉴定。口服攻毒链霉素处理的BALB/c小鼠明确分离株致病性。结果显示,成功分离到7株出血性大肠杆菌O157：H7,并且有1株迟缓性发酵山梨醇麦康凯培养基。毒力基因检测显示,其中6株毒力因子表型为stx1-stx2＋eae＋hlyA＋tccp＋,另有1株表现型为stx1＋stx2＋eae＋hlyA＋tccp＋,各分离株tccp基因均为阳性,但携带的重复片段数量有差异。所采集样品中肠出血性大肠杆菌O157：H7的检出率高达12%。1×1010 CFU同剂量口服接种经PBS洗涤的5株O157：H7分离株全菌,小鼠存活率有差异分别为40%,50%,60%,20%,50%,各分离株在小鼠体内排菌时间也有差异分别为攻毒后7,9,13,13,15d。 相似文献
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《中国畜牧杂志》2016,(5)
试验设计了椰子油组和对照组2个处理。采集育成猪肝脏组织,进行转录组高通量测序,找出2种处理间的差异表达基因及差异代谢通路。利用Illumina Hi SeqTM2 500高通量RNA-seq测序技术测序,使用Top Hat2软件将测序得到的reads序列与猪参考基因组(Sscrofa10.2)序列比对,找出差异表达基因,并在Nr、GO和KEGG数据库中进行功能注释、富集分析和聚类分析。结果表明:椰子油组和对照组肝脏中差异表达基因共有487个,与对照组相比,椰子油组表达上调的基因有222个,下调的基因有265个。在差异表达上/下调前15位基因中,有多个基因是参考基因组中没有的新基因和功能未知基因。GO功能分类注释到细胞组成、分子功能和生物学过程数据库中的差异表达基因数分别有398、368个和398个;注释到KEGG通路中差异表达基因数188个。 相似文献
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为了解连城白鸭与沔阳麻鸭肉质的差异,本研究选择300日龄连城白鸭与沔阳麻鸭各3只母鸭,测定胸肌粗脂肪、肌苷酸含量,同时对胸肌组织进行转录组高通量测序筛选品种间的差异表达基因,并对其功能进行注释、KEGG通路分析,挑选部分基因进行荧光定量PCR验证。结果显示:2个品种胸肌转录组测序得到40.6 Gb Clean Data,各样品的Clean reads与北京鸭参考基因组的比对效率在68.65%~72.17%。共筛选2333个差异表达基因,其中连城白鸭显著高表达1060个,沔阳麻鸭显著高表达1273个。差异表达基因共富集到280条信号通路中,67条通路显著富集,其中多条通路和肌肉脂肪沉积、能量代谢以及各类物质代谢相关。ACDC、FABP4、AMPD1、MITF、MAOA和CSAD等差异表达基因可能对不同品种鸭特异的肉质风味形成产生影响。经qRT-PCR验证,测序结果可靠。连城白鸭与沔阳麻鸭胸肌转录组比较显示不同地方鸭品种肉质存在一定差异。 相似文献
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肠出血性大肠杆菌O157 ler基因缺失突变株的构建及其特性 总被引：1，自引：1，他引：0
以肠出血性大肠杆菌O157∶H786～24为始发菌株,利用自杀性载体pCVD442,根据同源重组的原理敲除了染色体上的ler基因,构建了O157∶H7 ler基因缺失突变菌株,并对其生物学特性进行了初步研究。荧光定量PCR试验结果表明,始发菌株对HEp-2细胞的平均黏附数量是突变菌株的17倍。试验也证实了ler基因对LEE致病岛毒力基因的正调控作用,这为O157∶H7基因缺失突变弱毒疫苗株的建立奠定了基础。 相似文献
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旨在基于RNA-Seq技术对塔里木马鹿毛色相关基因进行筛选及分析。采用Illumina Hi Seq TM2000测序平台对塔里木马鹿和天山马鹿的皮肤组织进行转录组测序,所得序列经质控、组装后比对到NR、Swiss-Prot、COG、KOG、KEGG、GO和Pfam数据库中注释,并对差异表达基因进行筛选、功能注释和富集分析。结果表明,测序获得25 038个有注释信息的Unigenes,比对分析显示,塔里木马鹿与天山马鹿有922个差异表达基因,其中上调表达基因495个,下调表达基因427个;GO功能富集分析结果显示,568个差异表达基因富集到61个GO条目上,分别参与了生物学过程、细胞组分及分子功能;KEGG代谢通路富集分析发现,在差异表达基因中富集最显著的代谢通路是ECM-受体相互作用。利用实时荧光定量PCR（qRT-PCR）方法分析与塔里木马鹿毛色相关的7个候选基因的转录水平变化来验证转录组测序结果的准确性和可靠性,这些基因的表达趋势与转录组测序结果相一致。ECM-受体相互作用、蛋白质消化与吸收、PI3K-Akt信号通路及与黑色素合成相关的酪氨酸等通路可能与塔里木马鹿的毛色有关;候选基因MITF、Ggt1、VDR、PTPRF、CⅡTA、ARPC5L、POMC等可能在塔里木马鹿毛色形成过程中发挥重要作用。本研究结果为今后塔里木马鹿毛色相关基因的分子调控机制方面及挖掘潜在的新基因提供了丰富的试验数据。 相似文献
8.
《中国预防兽医学报》2016,(8)
为探索大肠杆菌O157∶H7对粪肠球菌N9分离株生长特性的影响及15种毒力基因在不同生长时期的应答情况,本研究将粪肠球菌N9、大肠杆菌O157∶H7单独培养和混合培养后分别计数菌株菌落总数,绘制生长曲线,根据生长曲线4个特定的时间点,分别提取其mRNA,反转录后利用荧光定量PCR方法检测15种毒力基因的转录水平。结果显示:混合培养与单独培养相比,粪肠球菌最高菌体浓度增加4 200多倍;两菌混合培养时,大肠杆菌整体促进了粪肠球菌15种毒力基因的转录,仅psr和atn在4个生长期中一直比单独培养时高,ebpA、ebpB、ebpR、rnjB、frsA、frsB除在稳定前期较单独培养时表达量低,其余3个时期均较高;而GelE和SprE除在对数中期和稳定期,其他时期均较单独培养时表达量低。稳定期ebpB和frsA表达量分别较单独培养高154.56倍和144.37倍,其次是对数后期ebpC,其表达量较单独培养时高110.35倍。实验结果表明:共培养时大肠杆菌能明显促进肠球菌的生长及其相关毒力基因的转录。 相似文献
9.
为证明免疫磁珠吸附技术对牛源大肠杆菌 O157∶H7分离效率的影响,从新疆五家渠市、伊宁县、昌吉市3个牛场的采集18份粪样、162份肛拭子、10份饲料样、17份水样和36份胴体表面棉拭子样本,经EC肉汤增菌后,分别采用免疫磁珠富集后和直接进行SMAC和MUG试验进行选择性培养,然后对菌体rfbE基因和鞭毛fliC基因进行PCR检测,最后对疑似大肠杆菌 O157∶H7菌用生化试验进行符合性检测。结果2种方法分别从243份样品中分离到8株和4株大肠杆菌 O157∶H7,统计学分析该差异不显著。本试验结果表明,在实践中免疫磁珠吸附技术和普通方法相比虽然在统计学上差异不显著,但确实能够增加大肠杆菌O157∶H7的分离数量,这与以前的相关研究结果基本一致。 相似文献
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The relationship of the urease operon in the highly virulent O149 porcine enterotoxigenic Escherichia coli (ETEC) strain Ro8 to a genomic island (GI) homologous to O island (OI) 48 of O157 enterohemorrhagic E. coli (EHEC) strain EDL933 was investigated. Eighty-four of 84 O149:H10 strains were urease positive whereas 44 of 44 O149:H43 porcine ETEC strains were urease-negative. Seventeen of 17 O149:H10 strains that were tested possessed the OI-48 homolog whereas 24 of 24 O149:H43 strains lacked this OI. Transposon insertions in lipB or guaA genes in strain Ro8 eliminated urease activity while insertions in the caiF gene increased urease activity. When the O149 ure operon was cloned on a high copy number plasmid, urease expression was increased approximately 11-fold in Ro8 and 83-fold in O157 strain EDL933 compared with that in the wild type Ro8. The O149 urease activity was expressed despite the presence of the same premature stop codon in ureD that is present in ure+ O157:H7 strains that are urease-negative. The ure operon in Ro8 consists of 4 893 nucleotides with 99% identity with the ure operons in EHEC O157:H7 strains EDL933 and Sakai, and is part of a GI similar to GI-48 of strain EDL933. This OI, designated OI-48149 , is inserted in the serX tRNA gene in strain Ro8 and contains genes for urease, tellurite resistance, iha and an AIDA-I-like adhesin. The presence of a homolog of the O157:H7 OI-48 in highly virulent O149 porcine ETEC suggests that this OI may contribute to establishment of the bacteria in the intestine. 相似文献
13.
SU Zhanqiang WANG Dong ZHANG Jinyu ZHANG Yi LIU Yingyu MA Kaiqi GAO Jiaojiao SUN Xue YAO Gang 《中国畜牧兽医》2018,45(1):212-218
To study the impact of season to the distribution of bovine E.coli O157:H7,samples of anus swabs (399),feces (68),water (29) and feed (43) were collected in the spring, summer,autumn and winter from A,B and C farms of Xinjiang. After enrichment by EC broth, SMAC and MUG selective culture were then performed. Finally,PCR was used for identification and virulence gene detection of isolated strains. A total of 5 E.coli O157:H7 strains were isolated from 539 samples from three farms (0.93%,5/539), 2 of them were from spring (1.44%,2/139),1 from autumn(0.56%,1/180),2 from winter (1.38%,2/145) and no strains were isolated from summer samples. One strain were isolated from anus swab samples in farm B (0.69%,1/145) and one were isolated from anus swabs (0.66%,1/152) and three strains were isolated from feed samples in farm C (20.00%,3/15),and no target strains were isolated from water samples. The distribution of bovine E. coli O157:H7 had obvious seasonal characteristics.One E.coli O157:H7 strain of farm B was isolated from autumn and four of farm C were from isolated spring (2 strain) and winter (2 strain),and the isolation rate of E. coli O157:H7 in spring and winter were higher than that in summer and autumn. In conclusion,under the special climate characteristics and feeding mode in Xinjiang,to prevent and control the spreading of E. coli O157:H7 of cattle,we must pay great attention on hygiene management of pens at cold season, specially avoiding the feed contaminated by feces. 相似文献
14.
García-Sánchez A Sánchez S Rubio R Pereira G Alonso JM Hermoso de Mendoza J Rey J 《Veterinary microbiology》2007,121(3-4):373-377
This study was carried out to evaluate the role of wild artiodactyls as reservoirs of Escherichia coli O157:H7 for livestock and humans. Retroanal mucosal swabs samples from 206 red deer (Cervus elaphus), 20 roe deer (Capreolus capreolus), 6 fallow deer (Dama dama) and 11 mouflon (Ovis musimon), collected during the hunting season (autumn-winter) in South-western Spain, were screened. Samples were pre-enriched in modified buffered peptone water, concentrated by an immunomagnetic separation technique and cultured onto selective cefixime tellurite sorbitol MacConkey agar. Polymerase chain reaction (PCR) was used to detect the presence of genes coding O157 and H7 antigens and the virulence factors verocytotoxin, intimin and enterohaemolysin. Three E. coli O157:H7 isolates were obtained from red deer (1.5%). Two of them showed inability to ferment sorbitol and lack of beta-d-glucuronidase (GUD) activity, however, the other strain investigated was an atypical sorbitol-fermenting E. coli O157:H7 with GUD(+) activity. This is the first report pointing to red deer as a reservoir of E. coli O157:H7 in Spain. 相似文献
15.
Chinen I Otero JL Miliwebsky ES Roldán ML Baschkier A Chillemi GM Nóboli C Frizzo L Rivas M 《Research in veterinary science》2003,74(3):283-286
Four hundred and twenty-two calves were examined for intestinal carriage of Shiga toxin-producing Escherichia coli O157:H7 using conventional plating. Two (0.5%) E. coli O157 were recovered. They were compared with 96 Argentine strains of different origin by pulsed-field gel electrophoresis, phage typing and PCR-RFLP of stx2 genes. One strain isolated from a calf, was closely related with 18 strains of clinical origin. 相似文献
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Lukásová J Abraham B Cupáková S 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2004,51(2):77-81
The study was carried out to investigate the incidence of Escherichia coli O157 in raw materials, foodstuffs and the agricultural environment. Of a total of 987 samples examined, 22 strains (2.2%) were identified as E. coli O157 and 10 of them as E. coli O157:H7. Cefixime-Tellurite MacConkey sorbitol agar (CT-SMAC) agar and Biosynth culture medium (BCM) E. coli O157:7 medium were used for the isolation. The virulence factors (stx1, stx2, eae, and ehxA genes) were identified by polymerase chain reaction (PCR). Most strains were isolated from the mechanically deboned poultry meat (nine), minced meat (six) and raw milk (four). One strain was isolated from beef carcass and two strains from waste water. No strains were were found in mass for sausages, refreshment salads, swabs of pork and poultry carcasses and faeces of cattle and pigs. Ten strains from the 22 identified proved to be positive for all factors of virulence. They were isolated from minced meat (four), raw milk (four), waste water (one) and swab from beef carcass (one). Sensitivity to the antimicrobial drugs ampicillin (AMS), ampicillin-sublactam (SAM), tetracycline (TET), ofloxacine (OFL), cefuroxime (CRX), chloramphenicol (CPM), gentamicine (GEN), colistin (COL), cephalozine (CLZ), cefoxitin (CXT), aztreonam (AZT), and sulphamethoxazole + trimethoprim (COT) was tested using the standard dilution technique and disc diffusion test. Minimum inhibitory concentrations (MIC) characteristics (MIC(50), MIC(90), MIC range) and inhibitory zone diameter were determined for each strain. As determined by MICs, the resistance to tested antibiotics in E. coli O157 isolates was found to AMS (90.9%), CLZ (81.8%), CRX (63.6%), CXT (72.7%), CPM (72.7%), TET (81.8%), SAM (59.1%), COT (9.1%), COL (63.61%), AZT (9%) and GEN (4.5%). The similar results were obtained using the disc diffusion method. The differences were found relating to SAM, CXT, CMO and TET. Resistance against one or more antibiotics was found in 95.4% of E. coli O157. Only one strain was susceptible to all tested antibiotics. Most of the strains were resistant to ampicillin and cephalozine. Eight different resistance phenotypes were demonstrated in E. coli O157. 相似文献
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Recently, virulence patterns of Stx2e-producing Escherichia coli from pigs with edema disease and from humans were compared and strains from diseased pigs were reported to be unlikely human pathogens [Sonntag, A.K., Bielaszewska, M., Mellmann, A., Dierksen, N., Schierack, P., Wieler, L.H., Schmidt, M.A., Karch, H., 2005. Shiga toxin 2e-producing Escherichia coli isolates from humans and pigs differ in their virulence profiles and interactions with intestinal epithelial cells. Appl. Environ. Microbiol. 71, 8855-8863]. In the present study, 31 Shiga toxin-producing E. coli (STEC) strains harboring stx2e, which were previously isolated out of fecal samples from healthy pigs at slaughter [Kaufmann, M., Zweifel, C., Blanco, M., Blanco, J.E., Blanco, J., Beutin, L., Stephan, R., 2006. Escherichia coli O157 and non-O157 Shiga toxin-producing Escherichia coli in fecal samples of finished pigs at slaughter in Switzerland. J. Food Prot. 69, 260-266], were characterized by phenotypic and genotypic traits. Nine of the thirty-one sorbitol-positive non-O157 STEC (stx2e) isolated from healthy pigs belonged to serotypes found in STEC isolated from humans, including two serotypes (O9:H-, O26:H-) reported in association with hemolytic-uremic syndrome. Otherwise, the serotypes were different from those isolated from cases of edema disease in pigs. The eae (intimin) gene, which is strongly correlated with severe human disease, was not detected. Moreover, all strains were lacking the genes for enterohemolysin (ehxA), porcine A/E associated protein (paa), STEC autoagglutinating adhesin (saa) and the serin protease EspI (espI). Nine strains tested positive for astA (EAST1), one O141:H17 strain for fedA (F18 fimbrial adhesin) and one O159:H- strain for terF (tellurite resistance). Similar to the Stx2e-producing E. coli isolated from humans, which are mainly lacking further virulence factors, genes of an iron uptake system on the high-pathogenicity island (irp2, fyuA) were detected in three ONT:H10 and ONT:H19 strains from healthy pigs. Consequently, although the isolated strains are unlikely to be associated with severe human diseases, healthy pigs cannot be excluded as a potential source of human infection with Stx2e-producing STEC. 相似文献
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Wagner M Allerberger F Manafi M Lindner G Friedrich AW Sonntag AK Foissy H 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2004,51(6):288-292
One hundred and ten clinical Escherichia coli isolates of serovar O157 (n = 102) and O26 (n = 8) were characterized for the presence of putative virulence genes by PCR. All but one of these isolates contained the eae gene. The EHEC-hly gene could be detected in all E. coli O157 and in 50% of E. coli O26 isolates. Forty-five (40.9%) of the 110 E. coli were positive for both stx(1) and stx(2) genes, 2 (1.8%) isolates were positive for stx(1) and 57 isolates (51.8%) were positive for stx(2) only. Among the 102 stx(2) positive isolates, 14 (13.7%) E. coli O157 contained also the stx(2c) variant gene. No other stx(2) variant was identified. Six clinical isolates (five E. coli O157:H7 and one E. coli O26) did not contain stx genes. Ten non-pathogenic E. coli isolates which were amplified as controls didn't contain any stx and eae gene but two of the ten strains contained the EHEC-hly gene. By their growth on chromogenic media, all but two of 50 E. coli O157 could be differentiated from eight E. coli O26 and 10 non-pathogenic E. coli. Sixty-one of the O157:H7 isolates were further subjected to pulsed-field gel electrophoresis (PFGE) which identified 49 distinguishable patterns. In five cases where contact infection among family members was suspected, indistinguishable PFGE patterns confirmed the epidemiological relatedness of the isolates. Moreover, two PFGE clusters were identified which comprised five and three strains, respectively. These findings indicate the occurrence of both family and diffuse outbreaks of E. coli O157 infections in Austria during recent years and demonstrate the need for molecular subtyping of these pathogens. 相似文献
19.
XUE Tao LI Li GAO Qing-qing CHEN Xian-liang LI Tian-tian QU Xin-qin GAO Song 《中国畜牧兽医》2017,44(10):2878-2885
This study was aimed to understand the relationship of virulence gene distribution and genetic evolution between cattle originated Shiga toxin-producing Escherichia coli (STEC) and human originated enterohaemorrhagic Escherichia coli (EHEC) O157. This experiment collected 18 strains STEC in a dairy farm from Jiangsu province and 9 STEC reference strains (human, sheep, swine and avian), according to the method of U.S. Centers for Disease Prevention and Control Center (PulseNet), using the XbaⅠ enzyme digestion and pulsed field gel electrophoresis (PFGE) analysis, virulence genes were detected in some STEC isolates. The virulence gene distribution of O157 from different origin was remarkably different. The cattle originated STEC O157 and the human originated EHEC O157:H7 (EDL933W) had the most similar virulence gene distribution. In contrast, virulence genes were lack in cattle STEC O18 and O26, even though the cattle STEC O18 and O26 had the similar genotype as human EHEC O157:H7 (EDL933W). PFGE of Xba Ⅰ digested chromosomal DNA from 27 isolates of STEC exhibited 22 profiles. In general,the Dice coefficients of different originated STEC ranged from 72% to 100%.Cattle STEC O157 had a high similarity with two strains of human originated EHEC O157, while a low similarity was demonstrated between cattle STEC O157 and STEC O157 of swine and avian. The Dice coefficients of the cattle STEC O157 and the two strains of human EHEC O157 ranged from 83% to 95%. The Dice coefficients of cattle STEC O26 (Ⅶ,Ⅷ) and the two strains of human EHEC O157 were more than 82%. Therefore, it was concluded that the cattle STEC O157 and human EHEC O157 had a closer relationship in terms of virulence gene distribution and in genetic evolution. 相似文献