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Genetic analysis of Y-chromosomes in five ethnic groups from Northwest China

YANG Ya-jun AN Li-zhe XIE Xiao-dong XU Jiu-jin(1.Department of Biology,Tianshui Normal College,Tianshui 741000,Gansu,China;2.School of Life Sciences,Fudan University,Shanghai 200433,China;3.School of Life Sciences,Lanzhou University,Lanzhou 730000,China;4.Institude of Genetics,Chinese Academy of Science,Beijing 100101,China)  
Variations of seventeen Y-chromosomal DNA polymorphisms,one microsatellite (DYS19), and sixteen biallelic markers were studied in 403 males from Northwest China.133 individuals from Dongxiang,56 males from Yugu and 78 individuals from Bao'an were selected to evaluate the degree of differentiation in this region,and males from neighboring areas such as the Hui (66 males) and Han (70 males) populations were also typed.For single nucleotide polymorphism (SNP) analysis,a method using the RFLP technology was applied.In addition to these 15 SNPs,the Y-chromosomal biallelic Alu repeat insertion DYS287 (YAP) was tested by agarose gel electrophoresis.The result shows that,among the 16 biallelic SNP/Alu systems,only seven markers,including M9,92R7,SRY1532,RPS4Y,12F2,L1Y and DYS287 (YAP) were found to be polymorphic in the five population samples except tat,LLY22g,M20, SRY~465,Apt,SRY8299,SY81,47z,and SRY2627,for their diversities were absent in the five popula- tions.A total number of nine different haplogroups (1,2,3,4,9,10,13,16 and 26) for Y-chromosomal biallelic polymorphisms were identified among the five populations studied.Of these,nine haplogroups were present in Hui's,eight in Dongxiangs and Han respectively,seven in Bao'ans and Yugus respectively.
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