排序方式： 共有14条查询结果，搜索用时 15 毫秒
1.
Objective Fowl adenoviruses (FAdVs) cause inclusion body hepatitis (IBH) in chickens. In this study, clinical cases of IBH from Australian broiler flocks were screened for the presence and genotype of FAdVs. Methods Twenty‐six IBH cases from commercial poultry farms were screened. Polymerase chain reaction (PCR) coupled with high‐resolution melt (HRM) curve analysis (PCR/HRM genotyping) was used to determine the presence and genotype of FAdVs. For comparison, field isolates were also assessed by virus microneutralisation and nucleotide sequence analysis of the hexon loop 1 (Hex L1) gene. PCR detection of chicken anaemia virus (CAV) and infectious bursal disease virus (IBDV) was also employed. Results FAdV‐8b and FAdV‐11 were identified in 13 cases each. In one case, FAdV‐1 was also identified. Cross‐neutralisation was observed between the FAdV‐11 field strain and the reference FAdV‐2 and 11 antisera, a result also seen with the type 2 and 11 reference FAdVs. Field strains 1 and 8b were neutralised only by their respective type antisera. The FAdV‐8b field strain was identical to the Australian FAdV vaccine strain (type 8b) in the Hex L1 region. The Hex L1 sequence of the FAdV‐11 field strain had the highest identity to FAdV‐11 (93.2%) and FAdV‐2 (92.7%) reference strains. In the five cases tested for CAV and IBDV, neither virus was detected. The evidence suggested the presence of sufficient antibodies against CAV and IBD in the parent flocks and there was no indication of immunosuppression caused by these viruses. Conclusion These results indicate that PCR/HRM genotyping is a reliable diagnostic method for FAdV identification and is more rapid than virus neutralisation and direct sequence analysis. Furthermore, they suggest that IBH in Australian broiler flocks is a primary disease resulting from two alternative FAdV strains from different species. 相似文献
2.
减蛋综合征病毒六邻体蛋白基因的克隆与真核表达载体的构建 总被引：2，自引：0，他引：2
应用降落PCR技术扩增出减蛋综合征病毒六邻体蛋白基因并将其克隆至pMDT-18载体上,酶切、PCR及测序结果表明插入的片段为目的基因.切下该目的基因定向克隆至pcDNA 3质粒构建六邻体蛋白基因真核表达载体pcDNA 3-hexon,经各种酶切、PCR鉴定及进一步测序鉴定,证明六邻体蛋白基因片段所插入的位置、大小、核苷酸序列和阅读框架正确无误,从而为下一步的转染、表达及进一步阐明EDSV六邻体基因结构与功能的关系和减蛋综合征基因工程苗的研究奠定了良好的基础. 相似文献
3.
4.
设计了1对特异性引物,应用降落PCR法对减蛋综合症病毒(EDSV)六邻体蛋白基因进行了扩增。将扩增产物克隆至pMD18-T载体中,经酶切和PCR鉴定后,初步证明了目的片段的正确性。进一步经核苷酸序列测定表明,所扩增的基因片段长度为2.74kb,共编码910个氨基酸,与由EDSV弱毒株(AA-2)全基因组的Hind酶切片段测序所得到的六邻体结构基因推测的氨基酸序列相比,有11处氨基酸发生了变异。 相似文献
5.
According to the sequence of hexon gene of fowl adenovirus groupⅠ(FAVⅠ) strain published in GenBank,two pairs of primers were designed and synthesized.The outer primers amplified a fragment of 475 bp in length, and the inner primers amplification fragment was 237 bp in length. A nested PCR assay for rapid detection of FAVⅠ was established.A specific 237 bp fragment was amplified from DNA templates of FAVⅠstrain,but no bands were amplified with templates extracted respectively from avian influenza virus (AIV) subtype H9,Newcastle disease virus (NDV), infectious bursal disease virus (IBDV),duck plague virus (DPV), reticuloendotheliosis (REV), avian reovirus (ARV), Marek's disease virus (MDV). Sensitivity of the 1st and 2nd amplifications by the nested PCR assay were 100 pg and 1 fg,respectively.The sensitivite of the 2nd amplifications increased by 105 times.The results showed that the nested PCR was specific,sensitive,rapid,accurate,and could be used as a routine assay for the detection of FAVⅠ.This method had good reproducibility, specificity and sensitivity, and might detect low content FAVⅠ accurately and rapidly. This method could be used as a method for the diagnosis and detection of clinical cases,and molecular epidemiological investigation of FAVⅠ. 相似文献
6.
利用3对引物（A、B、C）分别进行I群禽腺病毒的12个血清型毒株的Hexon全基因序列PCR扩增,并进行序列测定和PCR—RFLP分析,通过DNAStar软件和MEGA软件进行序列分析并绘制遗传发育进化树。结果显示,Hexon基因全长为2800左右个核苷酸,编码约940个氨基酸,不同血清型之间的同源性为75．2％～99．5％,变异范围是0．0％～24．3％。推导的氨基酸同源性为20．7％～98．8％,差异性为0．0％～24．2％。12个血清型之间Hexon全基因序列信息用来评价I群禽腺病毒家族的种系发育关系,构建的进化树显示出5个主要的分支。选用限制性内切酶HaeⅡ,利用存在差异的Hexon序列片段D特异性可以有效区分大部分血清型。结果表明,获得了I群禽腺病毒12个血清型不同毒株的Hexon全基因序列并进行了分子进化分析,同时结合12个血清型PCR—RFLP分析,为进一步分析鉴别I群禽腺病毒不同血清型提供依据。 相似文献
7.
[目的]对六安、郭河、宣城、肥西某养殖户送检的疑似腺病毒的病料进行分离鉴定,为进一步鉴别、预防和控制疾病提供科学的理论依据。[方法]首先采集病例中鸡的肝脏,提取病毒DNA,根据Genbank已登录腺病毒的hexon基因设计引物,通过PCR检测病料中腺病毒,对扩增的序列进行连接转化和阳性克隆子筛选,并对扩增到的序列进行测序鉴定,最后将获得的基因序列构建进化树分析确定安徽省部分地区禽腺病毒血清型。[结果]临床中疑似腺病毒感染的主要症状为心包积液和肝脏肿大,用设计的引物均检测出大小为599 bp的目的基因条带,序列比对结果发现,此次检测的腺病毒均为4型腺病毒。[结论]试验建立了快速检测禽腺病毒的方法,为安徽省地区禽腺病毒防控提供了理论依据。 相似文献
8.
目的验证购自中国兽医微生物菌种保藏管理中心（China Veterinary Culture Collection Center,CVCC）的4株禽腺病毒（FAdV-1 AV208、FAdV-4 AV211、FAdV-8 AV215、FAdV-11 AV218）的血清型。方法采用PCR的方法对4株FAdV hexon基因片段进行特异性扩增、克隆与测序,并与GenBank上公布的FAdV各血清型进行亲缘性分析。结果hexon基因片段核苷酸及其编码Hexon蛋白氨基酸亲源性分析结果表明,FAdV-1 AV208为禽腺病毒A血清1型;FAdV-4 AV211为禽腺病毒C中的血清4型;FAdV-8 AV215为禽腺病毒E中的血清8b型;FAdV-11 AV218为禽腺病毒C中的血清10型。结论FAdV-1 AV208、FAdV-4 AV211的血清型与CVCC标注一致;FAdV-8 AV215为FAdV-8b,相比CVCC该研究进一步细化了其血清型;而FAdV-11 AV218为FAdV-10,与CVCC标注的血清型不一致。该研究为今后正确使用CVCC标准毒株FAdV-8 AV215、FAdV-11 AV218提供了参考。 相似文献
9.
2株Ⅰ群禽腺病毒的分离鉴定及致病性分析 总被引：1，自引：1，他引：0
为了解山东省禽腺病毒（fowl adenovirus,FAdV）毒株的基因遗传演化情况及致病性,本试验对山东省两家疑似暴发鸡包涵体肝炎和心包积液综合征鸡场采集的病料（肝脏、脾脏）进行PCR鉴定,并将鉴定为FAdV的2份阳性病料提取病毒液,接种鸡肝癌细胞（LMH）进行毒株传代培养和细胞病变（CPE）观察、PCR检测、TCID50测定、鸡胚致病性试验、SPF鸡回归试验、病毒hexon部分基因扩增及序列分析。结果显示,试验成功分离到2株FAdV,2株分离株细胞传第1代即可观察到CPE,PCR均可扩增出大小为500 bp的片段,且2株分离株细胞F5代TCID50分别为10-7.75/0.1 mL和10-7.60/0.1 mL,均对7日龄SPF鸡胚有强致病性;第1分离株和第2分离株对21日龄SPF鸡攻毒死亡率分别为80%和15%。hexon基因核苷酸同源性分析结果显示,第1分离株与FAdV-4株同源性最高（99.57%）,第2分离株与FAdV-8b株同源性最高（99.18%）。这2株FAdV分离株均与Ⅰ群禽腺病毒同源,与火鸡出血性肠炎病毒（HEV）所在的血清Ⅱ群及减蛋综合征病毒（EDSV）所在的血清Ⅲ群禽腺病毒位于不同分支。第1分离株基因型为C型,血清型为4型,命名为FAdV-SDC4株;第2分离株基因型为E型,血清型为8b型,命名为FAdV-SDE8b株。综上所述,FAdV-SDC4和FAdV-SDE8b株属于近几年国内流行毒株。本研究结果可为鸡包涵体肝炎、心包积液综合征的防控工作和疫苗株的选择提供科学依据。 相似文献
10.
运用PCR技术从表现产蛋异常的种番鸭分离鉴定的减蛋综合征病毒(EDSV)E05株中分段扩增六邻体蛋白基因,分别与克隆载体pMD18-T连接后,转化感受态细胞,对经PCR鉴定和酶切鉴定均为阳性的克隆进行测序.结果表明,E05株六邻体蛋白基因长度为2733 bp,共编码910个氨基酸.序列分析表明,该株病毒与鸡源EDSV 127株和鹌鹑源EDSV QU株六邻体蛋白基因的核苷酸同源性分别为99.6%和96.0%,氨基酸同源性分别为99.9%和99.3%. 相似文献