• 제목/요약/키워드: Nucleic acid vaccine

검색결과 7건 처리시간 0.023초

Infectious bursal disease virus 국내분리주 및 백신주의 VP2 gene의 비교분석 (Sequence analysis of VP2 gene of infectious bursal disease virus field isolate and vaccine strains)

  • 김길동;강정무;김선중;권혁무;한태욱
    • 대한수의학회지
    • /
    • 제46권3호
    • /
    • pp.235-248
    • /
    • 2006
  • The VP2 full gene of Korean infectious bursal disease virus(IBDV) strain, SH/92, three attenuated vaccine strains, Bur706, Bursine-2 and CEV/AC strains, were amplified by reverse transcriptase-polymerase chain reaction and sequenced and compared with published VP2 gene sequences of IBDVs. The VP2 nucleotide sequence similarity between SH/92 and three vaccine stains was 95.6~96.5% whereas the nucleic acid similarity among three vaccine strains was 97.5~98.5%. The amino acid sequence similarity of VP2 of SH/92 compared with three vaccine strains was between 94.4 and 97.6% while the amino acid similarity among three vaccine strains was between 97.4 and 98.4%. The amino acid similarity between SH/92 and classical virulent strain, 52/70 and STC strain was 96.4 and 96.5%, respectively. The serine-rich heptapeptide was conserved in CEVAC and Bursine-2 as well as SH/92 but not in Bur706. The phylogenetic tree developed from amino acid sequences showed that SH/92 was categorized with vv IBDVs(HK46, OKYM, KKI, UPM94/273, SH95) in one branch while three vaccine strains were catagorized with STC strain in the other branch.

Microbe-derived extracellular vesicles as a smart drug delivery system

  • Yang, Jinho;Kim, Eun Kyoung;McDowell, Andrea;Kim, Yoon-Keun
    • Translational and Clinical Pharmacology
    • /
    • 제26권3호
    • /
    • pp.103-110
    • /
    • 2018
  • The human microbiome is known to play an essential role in influencing host health. Extracellular vesicles (EVs) have also been reported to act on a variety of signaling pathways, distally transport cellular components such as proteins, lipids, and nucleic acid, and have immunomodulatory effects. Here we shall review the current understanding of the intersectionality of the human microbiome and EVs in the emerging field of microbiota-derived EVs and their pharmacological potential. Microbes secrete several classes of EVs: outer membrane vesicles (OMVs), membrane vesicles (MVs), and apoptotic bodies. EV biogenesis is unique to each cell and regulated by sophisticated signaling pathways. EVs are primarily composed of lipids, proteins, nucleic acids, and recent evidence suggests they may also carry metabolites. These components interact with host cells and control various cellular processes by transferring their constituents. The pharmacological potential of microbiome-derived EVs as vaccine candidates, biomarkers, and a smart drug delivery system is a promising area of future research. Therefore, it is necessary to elucidate in detail the mechanisms of microbiome-derived EV action in host health in a multi-disciplinary manner.

차세대 감염병 백신 (Next-generation Vaccines for Infectious Viral Diseases)

  • 윤선우
    • 생명과학회지
    • /
    • 제33권9호
    • /
    • pp.746-753
    • /
    • 2023
  • 바이러스성 전염병은 전 세계 공중 보건에 가장 큰 위협 중 하나로 간주된다. 최근 중증급성호흡기증후군 코로나바이러스-2(SARS-CoV-2)로 인한 COVID-19 대유행은 신종 바이러스 감염의 위협을 극명하게 상기시켜 주었다. 효율적인 백신과 치료제 개발 및 생산은 팬데믹을 퇴치할 수 있는 유일한 대안일 것이며 COVID-19 대유행은 새로운 바이러스성 질병을 통제하고 예방하기 위한 새로운 백신 플랫폼의 필요성을 보여주었다. 기존의 백신 플랫폼인 약독화 생백신, 불활성화 백신은 백신 개발 속도, 제조 등이 광범위한 백신 적용을 위한 긴급 사용에 한계가 있다. 흥미롭게도, COVID-19 예방을 위한 SARS-CoV-2 mRNA-지질나노입자(LNP) 플랫폼은 기존 백신 플랫폼 한계에 대한 효과적인 대안임이 확인되었다. 또한 COVID-19 mRNA 핵산 백신과 나노입자 기반 플랫폼은 SARS-CoV-2 및 변종 SARS-CoV-2 모두에 효과적인 백신임이 확인되었다. 이 논문에서는 mRNA 백신, 디지털 백신 및 나노입자백신 등의 차세대 백신 플랫폼을 중점으로 백신 기술 및 플랫폼의 장단점에 대해 기술하였다.

개선된 플라스미드 DNA 전달 효율을 위한 히알루론 아민 코팅 폴리에틸렌이민 기반 전달 시스템 (Polyethyleneimine based Delivery System Coated with Hyaluronate Amine for Improved pDNA Transfection Efficiency)

  • 오경연;장용호;이은비;김태호;김현철
    • 공업화학
    • /
    • 제33권1호
    • /
    • pp.83-89
    • /
    • 2022
  • 현재 진행 중인 코로나19의 세계적 유행을 기점으로 유전자 전달을 통한 면역 형성에 대한 연구가 활발히 진행되고 있다. 특히 바이러스를 통한 유전자 전달이 부작용이 다수 발견됨에 따라 비바이러스성 유전자 전달체에 대한 요구가 크게 증가하였다. 본 연구에서는 생체적합물질인 히알루론 아민으로 코팅한 폴리에틸렌이민-플라스미드 DNA 복합체를 통한 효율적인 유전자 전달 시스템을 제안했다. 다양한 조성에서 생성된 폴리에틸렌이민-플라스미드 DNA 복합체(polyplex)와 히알루론 아민으로 코팅한 폴리에틸렌이민-플라스미드 DNA 복합체(polyplex-HA)의 크기 및 플라스미드 DNA 발현 정도를 비교해 각 물질의 최적 비율을 찾아냈고 복합체의 크기 및 제타 전위, 에너지 필터링 투과 전자현미경(EF-TEM) 이미지를 통해 입자의 특성을 평가했다. 세포 내 전달 및 발현 효율을 형광현미경과 유세포분석기를 통해 상용화 되어있는 유전자 전달체인 lipofectamine과 비교 분석했다. 본 연구에서 제안된 polyplex-HA는 pDNA 뿐만 아니라 다양한 유전물질을 전달할 수 있으며, 전달체에 대한 면역반응이 적어 다회성 투여에 유리하여 미래의 백신 플랫폼의 기반이 될 수 있을 것으로 기대할 수 있다.

Sequence analysis of the fusion protein gene of Newcastle disease virus isolated from breeder ducks in Korea

  • Han, Mi Na;Byeon, Hyeon Seop;Lee, Cho Yeon;Jo, Nam Sin;Lee, Jong Hwa;Jang, Rae Hoon;Kim, Chang Seop;Na, Ki Jeong
    • 한국동물위생학회지
    • /
    • 제42권4호
    • /
    • pp.245-250
    • /
    • 2019
  • Newcastle disease (ND) is an infectious poultry disease that caused high mortality and reduced egg production. NDVs are regularly present in the domestic duck population. And ducks play a possible role in the maintenance and transmission of NDVs. While we were monitoring the Avian Influenza, NDVs were isolated from field samples by accident. So we analysed the biological and genetic characteristics of these viruses. Lentogenic NDVs were isolated from two farms among twenty breeder duck farms. The ages of ducks were 39 weeks old in the 'A' farm and 3~72 weeks old in the 'B' farm. And they were not inoculated with the NDVs vaccine. In the biological characteristics, the both viruses which separated from the farm 'A' and 'B' were thermostable. The amino acid sequence of a site from 112 to 119 in the fusion (F) protein was 'GKQGRLIG' which has monobasic motif in the samples of both farms. And this means the separated NDVs are lentogenic. Phylogenetic analysis was performed by entire nucleotide sequence of F protein. The virus strains from the A farm (MN095239) and the B farm (MN095240) belonged to class II genotype I. Using the analysis of whole F protein nucleic acid sequence, the MN095239 (GenBank) had homology with Ulster strain about 99.95% and the MN095239 (GenBank) had homology with KR/CK/KU_LBM255/09 strain about 99.89%. NDV surveillance is needed to investigate epidemiological relationship of domestic breeder duck isolates in Korea.

삼출성 중이염 소아의 중이액에서 폐구균의 분자적 진단 (Molecular Diagnosis of Streptococcus pneumoniae in Middle Ear Fluids from Children with Otitis Media with Effusion)

  • 변성완;김한울;윤서희;박인호;김경효
    • Pediatric Infection and Vaccine
    • /
    • 제22권2호
    • /
    • pp.106-112
    • /
    • 2015
  • 목적: 장기간의 항생제 치료는 중이염 어린이 환자의 중이액으로부터 원인균이 배양되는 것을 방해한다. 본 연구는 배양 음성 중이액으로부터 분자적 진단에 의한 신속한 균 검출 가능성 여부를 확인하고자 하였다. 방법: 폐구균 lytA 유전자를 표적으로 하는 PCR과 LAMP로 민감도와 특이도를 비교 결정하고, 임상중이액에서의 폐구균 검출에 적용하였다. 결과: PCR 기법에 의한 폐구균 검출 최소한계는 약 $10^4$ 집락형성단위(CFU)이고, LAMP의 검출 최소한계는 10 CFU에서 결정되었다. 한편 두 가지 검사법 모두 Haemophilus influenzae 와 Moraxella catarrhalis 에 대해 $10^6$ CFU 이상에서도 DNA를 증폭하지 않았다. 22개의 배양음성 중이액 중에서 12개 검체가 LAMP-양성(54.5%, 12/22)으로 확인되었고, 이들 12개 LAMP-양성 검체 중, 3개의 검체만이 PCR-양성으로 확인되었다(25%, 3/12). 본 연구의 결과는 LAMP 기법의 폐구균 검출 해상력이 PCR 기법에 비교하여 4배 이상 높음을 보여준다(P<0.01). 결론: lytA -특이 LAMP 기법은, 중이액 내의 타 병원균과는 교차반응 없이 10 CFU 폐구균의 DNA를 검출할 수 있는 고해상 기술로서, 중이액 폐구균 검출 및 폐구균 백신의 보급에 따른 백신 효과 평가에 적용이 기대된다.

Differential Gene Expression in the Pathogenic Strains of Actinobacillus pleuropneumoniae Serotypes 1 and 3

  • Xie, Fang;Zhang, Mingjun;Li, Shuqing;Du, Chongtao;Sun, Changjiang;Han, Wenyu;Zhou, Liang;Lei, Liancheng
    • Journal of Microbiology and Biotechnology
    • /
    • 제20권4호
    • /
    • pp.789-797
    • /
    • 2010
  • The limited information on differential gene expression in the different serotypes of Actinobacillus pleuropneumoniae has significantly hampered the research on the pathogenic mechanisms of this organism and the development of multivalent vaccines against A. pleuropneumoniae infection. To compare the gene expressions in the A. pleuropneumoniae strains CVCC259 (serotype 1) and CVCC261 (serotype 3), we screened the differentially expressed genes in the two strains by performing representational difference analysis (RDA). Northern blot analyses were used to confirm the results of RDA. We identified 22 differentially expressed genes in the CVCC259 strain and 20 differentially expressed genes in the CVCC261 strain, and these genes were classified into 11 groups: (1) genes encoding APX toxins; (2) genes encoding transferrin-binding protein; (3) genes involved in lipopolysaccharide (LPS) biosynthesis; (4) genes encoding autotransporter adhesin; (5) genes involved in metabolism; (6) genes involved in the ATP-binding cassette (ABC) transporter system; (7) genes encoding molecular chaperones; (8) genes involved in bacterial transcription and nucleic acid metabolism; (9) a gene encoding protease; (10) genes encoding lipoprotein/membrane protein; and (11) genes encoding various hypothetical proteins. This is the first report on the systematic application of RDA for the analysis of differential gene expression in A. pleuropneumoniae serotypes 1 and 3. The determination of these differentially expressed genes will serve as an indicator for future research on the pathogenic mechanisms of A. pleuropneumoniae and the development of a multivalent vaccine against A. pleuropneumoniae infection.