单位点DNA探针在早孕期亲子鉴定中的应用研究

本研究利用限制性片段长度多态性分析技术，从3O例早孕期绒毛组织及其父母血液中提取DNA，以两种单位点DNA探针PAC255及PAC256进行检测，根据所获等位基因的大小，查国人此二位点基因频率及每一家系三组合中该基因传递相对机会，计算出相应的亲子关系指数和亲子关系概率。结果．累积条子关系指数和累积亲子关系概率的范围分别是56．80～8333.50和98.27～99.99％、按照国际通用标准，这30个家系中，可以肯定亲手关系者20例（66.7％），极可能有亲子关系者8例（26.7％），非常可能有亲子关系者2例（6.7）。说明同时使用此二单位点探针，在早孕期亲子鉴定中有很高的应用价值。

APPLIED STUDY ON SINGLE LOCUS DNA PROBE FOR EARLY PREGNANCY PATERNITY TEST

30 chorinic villi in early pregnancy (8-10 weeks)and their parent blood samples were analysedusing the method of restriction fragment length polymorphisms with single locus DNA probes of PAC255 and PAC256. Based on the gene frequencies of these two loci in Chinese and the relativechance of obligatory gene in each triplet, the cumulative parternity index and cumulative relativechance of paternity were calculated. The range of the former is 56. 80- 8333. 50, and the later is 98.27 - 99. 99 %. According to the international standard of paternity test, in the 30 pedigrees, 20 cases(66. 7 % )were assured for their paternity. It is showed that the combination of PAC255 and PAC256single locus DNA probes for the paternity test of early pregnancy is very available.