Genetic polymorphisms of eight STR loci in a Chinese Han population

Objective: To understand the allele structure and genetic polymorphism at eight STR loci in Chinese Han population and construct a preliminary database. Methods: EDTA-blood specimens were collected from the unrelated individuals in Chengdu, China. The DNA samples were extracted with Chelex method and were amplified by PCR technique. The PCR products were analyzed by the PAG horizontal electrophoresis with discontinuous buffer system and by the approach of the automated fluorescence detection. Results: Five STR loci consist of simple repeat motifs, while three STR loci contain complex repeat structures. The STR polymorphisms at all of the eight loci have been observed in Chinese Han population. According to the obtained data, the combined exclusion probability and the combined discrimination power for these STR markers in Chinese population are 0. 9978 and 0. 999 999 992, respectively. Conclusion: The obtained data are beneficial to understanding the population genetics of the eight STR loci in Chinese Han population. For forensic genetics, the obtained data can be used to calculate the probabilities dealing with the paternity test and the individual identification.