摘要
目的研究中国2006年流行的麻疹野病毒代表株血溶素蛋白(Fusion Protein,F)基因的分子特征,与其他年份毒株相比分析F基因的变异规律。方法从2006年各省(自治区、直辖市)送检的麻疹野病毒中选取9株代表株,使用逆转录-聚合酶链反应扩增病毒的F基因全长,并进行核苷酸序列测定,同时与中国疫苗株及其他年份毒株进行序列比对及基因亲缘性关系分析。结果2006年9株中国流行麻疹野病毒代表株,其核苷酸同源性为98.5%～99.8%,氨基酸同源性为99%～100%;与中国疫苗株沪191相比,其核苷酸同源性为95.4%～96.2%,氨基酸同源性为96.7%～97.2%;与1999～2003年代表株相比,其核苷酸同源性为97.9%～99.7%,氨基酸同源性为98.1%～100%。F基因3个糖基化位点(第32、64、70位氨基酸)、对病毒整合功能起着重要作用的第112位精氨酸(Arg)、第195位亮氨酸(Leu)未发生改变。结论中国2006年流行的麻疹病毒F基因变异不大,与其他年份毒株相比变异也不明显。F蛋白的重要功能位点未发生变异,F蛋白的变异与2006年麻疹流行无相关性。但由于F蛋白对病毒感染细胞和促使机体产生抗体具有重要意义,对F蛋白变异规律进行常规监测,对了解麻疹病毒变异规律和评价疫苗的保护效果具有重要意义。
Objective To study genetic characteristic of fusion gene （F gene ） of wild type measles virus circulated in 2006, analysis the variation regular of F gene through comparing with measles virus of 1999-2003. Method 9 representative strains, which isolated from 8 provinces in 2006, were selected. The whole F gene were amplified by reverse transcript-polymerase chain reaction and were sequenced, then they were compared with the nucleotide acid sequences of Chinese measles vaccine strains and the representative strains of 1999-2003, finally the phylogenetic analysis were conducted. Results Among 9 representative strains circulated in China in 2006, the homology of nucleotide acid and amino acid were 98.5%-99.8% and 99%-100% respectively, and they were 95.4%-96.2% and 96.7%-97.2% respectively compared with Chinese Vaccine strains, the homology of nucleotide acid and amino acid were 97.9%-99.7% and 98.1% -100% respectively compared with strains of 1999-2003, In F gene, the 3 glycosylation site （aa32, aa64 and aa70）, aall2 and aa195, which played the important role to viral fusion, that have no changes. Conclusion The F genes of measles virus of china in 2006 had no significant variation, the genetic diversity was not predominance comparing with strains of 1999-2003, and important functional sites in Fusion protein didn＇t change, the measles epidemic was not correlate with the F gene variation. Because F protein play an important role in Measles viruses, it needs to perform the routine monitoring of F gene, which benefit for understanding of epidemic features and genetic variation pattern of wild type Measles viruses.
出处
《中国疫苗和免疫》
CAS
2009年第3期211-214,共4页
Chinese Journal of Vaccines and Immunization
基金
卫生部疾病控制专项
世界卫生组织西太平洋区麻疹参比实验室专项
关键词
麻疹病毒
血溶素蛋白
基因特征
Measles virus
Fusion protein
Genetic characteristic
