CAJ | 학술논문

目的分析2002-2010年浙江省急性出血性结膜炎(AHC)暴发疫情病原柯萨奇病毒A组24型变种(CA24v)流行株的全基因组序列与遗传特性.方法选取浙江省不同年份的CA24v流行株,采用RT-PCR扩增基因序列,并与国内外流行株进行全基因组及VP1、3C区序列比较分析.结果浙江省2002年和2010年CA24v全序列为7456～ 7458 bp,编码含2214个氨基酸残基的多聚蛋白,2010年的Zhejiang/08/10较2002年的毒株在5’端非编码区的第97、119位各存在一个T碱基插入,Zhejiang/08/10与2002年以来的分离株各区段氨基酸同源性为94.7％～ 100.0％,与近60年来CA24流行代表株全序列中各区段氨基酸的平均差异率以2A区与3A区最大,分别达8.4％和7.3％,3D区最小,仅为1.9％.1987年与2002年以来的CA24v毒株在全序列上共存在38个和20个氨基酸的稳定变异.2002-2010年CA24v的组间遗传距离分析表明,3C区较VP1区更为稳定,CA24v的早年流行株Jamaica/10628/87在3D区上可能存在重组,而在近年流行株中未发现该现象.结论 CA24v以时间序列为主逐年进化,地域间虽存在差异,但影响较小.自2002年起,由CA24v引起的AHC-直在浙江省本地散在流行.
목적 분석2002-2010년절강성급성출혈성결막염(AHC)폭발역정병원가살기병독A조24형변충(CA24v)류행주적전기인조서렬여유전특성.방법 선취절강성불동년빈적CA24v류행주,채용RT-PCR확증기인서렬,병여국내외류행주진행전기인조급VP1、3C구서렬비교분석.결과 절강성2002년화2010년CA24v전서렬위7456～ 7458 bp,편마함2214개안기산잔기적다취단백,2010년적Zhejiang/08/10교2002년적독주재5’단비편마구적제97、119위각존재일개T감기삽입,Zhejiang/08/10여2002년이래적분리주각구단안기산동원성위94.7％～ 100.0％,여근60년래CA24류행대표주전서렬중각구단안기산적평균차이솔이2A구여3A구최대,분별체8.4％화7.3％,3D구최소,부위1.9％.1987년여2002년이래적CA24v독주재전서렬상공존재38개화20개안기산적은정변이.2002-2010년CA24v적조간유전거리분석표명,3C구교VP1구경위은정,CA24v적조년류행주Jamaica/10628/87재3D구상가능존재중조,이재근년류행주중미발현해현상.결론 CA24v이시간서렬위주축년진화,지역간수존재차이,단영향교소.자2002년기,유CA24v인기적AHC-직재절강성본지산재류행.
Objective To analyze the genetic characteristics of the complete sequence of coxsackievirus A24 variant(CA24v) isolated from acute hemorrhagic conjunctivitis (AHC) outbreaks in Zhejiang province during 2002 to 2010.Methods Complete sequences of CA24v epidemic strains isolated in different years were amplified under the RT-PCR assay,while the sequences of whole genome,VP1,and 3C region of Zhejiang strains were compared with epidemic strains isolated in other areas of China and abroad.Results The whole genome of Zhejiang CA24v strains isolated in 2002 and 2010 was 7456-7458 bp in length,encoding a polyglutamine protein which containing 2214 amino acid residues.There was a insertion with T on site 97 and 119 within 5' non-coding region between epidemic strain Zhejiang/08/10 and strains isolated in 2002.The rates of amino acid homology among Zhejiang/08/10 and other strains isolated since 2002 were between 94.7％ and 100.0％.Compared with the representative strains circulated within the recent 60 years,the largest average amino acid variations had been occurred on region 2A and 3A,with the ratios as 8.4％ and 7.3％ respectively.The smallest variation happened in region 3D,with the ratio only as 1.9％.The rates of stable amino acid variation on the whole genome between strains isolated since 1987 and 2002 were 38 and 20.P-distance within groups appeared that region 3C was more stable than VP1 of strains isolated in 2002-2010,and the 3D of early strain Jamaica/10628/87 might have had a nature of recombination but not observed on those epidemic strains in recent years.Conclusion Within the evolution of CA24v strains,the time course was more significant than the geographical differences.There had been sporadic epidemics of AHC caused by CA24v in Zhejiang province since 2002.