Abstract: Using PCR-STR, the polymorphism distributions of nine STR loci were investigated in 183 unrelated Mulao individuals from Guangxi Province, and as part of this work the genetic database of Mulao population was established. There were 70 STR alleles and 207 genotypes were observed in the nine STR of the Mulao ethnic group with statistical frequencies ranging from 0.002 7~ 0.530 1 and 0.0055~ 0.3388 respectively. The average heterozygosity was 0.729 8; polymorphism information content was 0.701 6; accumulative discrimination power was 0.999 999999, and the probability of paternity exclusion was 0.999 098. The result of a comparison between the Mulao and other ethnic groups showed that there were statistically significant differences between the Mulao and Miao, Hui minorites of Guangxi and the minorities of Yunnan and North China, but with there was no difference between the Mulao and Guangxi Zhuang and Hunan Han minorities. The obtained data can be useful for its application to genetics, forensic science and anthropology.

Key words: Mulao minority; PCR-STR; Genetic polymorphisms