STR图谱用于生物制品生产用人源细胞鉴别的研究

目的 研究短串联重复序列(STR)图谱鉴别方法在生物制品生产用人源细胞质量控制中的应用.方法 采用PCR-毛细管电泳分析方法,分别建立检测9个和16个人STR位点的方法鉴别人源细胞,并对来自不同生物制品生产单位、不同传代水平的病毒性疫苗生产用人二倍体细胞株及基因治疗制品生产用的293细胞进行STR图谱的检测和比较.结果 建立人源细胞株的STR图谱分析方法.13个单位提供的病毒疫苗生产用21株人二倍体细胞中,除1株细胞并非MRC-5细胞外,其他细胞均可认定为本细胞,且未发现交叉污染现象.而8个单位提供的12株基因治疗用293细胞的STR图谱则存在明显差异,提示该类细胞可能存在来源、基因修饰改造背景不清及传代过程中遗传特性不稳定的因素.结论 STR图谱分析灵敏度高、特异性强,可用于生产用人源细胞株/系间的鉴别.

STR profiling on authentication of human cell lines for production

Objective To study the application of short tandem repeat (STR) profiling in quality control of human cell lines used for biological production. Methods The methods detecting 9 and 16 STR loci to identify human cell lines by PCR-capiilary electrophoresis were established respectively. Human cell lines, which were derived from many corporations and including diploid cell strains used for virus-vaccine production and 293 cell lines used for gene therapy products, were analyzed and compared by these two methods. Results The STR profiling methods used for authentication of human cell lines were established. Most of human diploid cell strains(20/21 ) used for virus-vaccine production from 13 corporations were iden-tiffed as the intended cells and no cross-contamination was found. However, one MRC-5 cells was identified as a false cell line and one MRC-5 had 3 alleles in D13S317 locus. For 12 strains of 293 cell lines, there were significant differences in STR profiling from different manufactures, which was likely be explained that the sources and gene modifications of these 293 cell lines are not well known and their genes are unstable during passage. Conclusion The STR profiling method has the advantages of high sensitivity and specifici-ty, and can be used for authentication of each of human cell lines for biological production.