甲3型流感病毒流行株金刚烷胺耐药性的初步研究

Resistance to amantadine of epidemic strain of H3 subtype influenza virus:a primary study

目的调查流感病毒流行株对金刚烷胺的耐药情况。方法2003至2005年北京地区流感流行季节分离的流行株经提取RNA,RT-PCR一步法扩增流感病毒的M2基因片断,用凝胶电泳、核酸测序以及生物信息软件分析法对耐药性有关的氨基酸位点确定。结果41株流行株中30株对金刚烷胺类药耐药,其比例为75%(30/40)。耐药株变异表现为31位氨基酸被天冬酰胺置换。结论此变异现象值得我们高度关注,应在我国开展抗流感病毒耐药性的监测,进一步确定我国流感病毒耐药株的发生频率,为我国制定应对流感大流行措施提供参考。

Objective To study the resistance to amantadine of epidemic strain of H3 subtype influenza virus. Methods Forty-one strains of influenza virus were isolated from pediatric patients with influenza in Beijing 2004-2005 and were identified as H3 subtype. RNA was extracted. Thirty of the 40 strains were resistant to amantadine with a resistance rate of 75%. The M2 gene ion channel fragments were amplified by one-step RT-PCR, sequenced, and then underwent systemic tree analysis. Results M2 ion channel associated gene fragment with a molecular size of 153 bp was obtained. The amino acid at the site 31 changed from serine into asparagines, a mutation identical to that of the reference strain A/PR8/34 resistant to amantadine. Conclusion The resistance rate to amantadine is high among the epidemic strains of H3 subtype influenza virus in China. The associated mutation occurs at the site 31 of M2 protein.