Résumé
Objective To select 15 short tandem repeat(STR) loci that are highly and steadily polymorphic,and study the genetic relationships between Luoba ethnic group,Tibetan living in Lassa and Changdu area,and other Asian populations by using 15 STR polymorphism.Methods The blood samples of unrelated individuals from Luoba ethnic group,Lassa Tibetan and Changdu Tibetan were collected.DNA templates were screened using AmpF/ STR Identifiler kit and ABI3100Avant DNA analyzer with Genescan and Genotype software.The STR data of Luoba,Lassa Tibetan,Changdu Tibetan,other 21 Chinese ethnic groups and six Asian populations were compared;phylogenesis tree was constructed;the genetic relationships among ethnic groups living in Tibet and other Asian populations were analysed.Results Eight Hans clustered,and five ethnic groups of Guangxi clustered firstly;then the two clustered with Luoba,and two groups of Tibetan secondly;and then clustered with other Chinese populations,and then the Chinese groups clustered with other six Asian populations and Chinese Uygur lastly.Conclusion The results of this study are basically consistent with geographic distribution,and histories of these ethnic groups.They can provide the genetic proofs for the origin,migration,formation and development of ethnic groups living in Tibet.