目的研究山东地区汉族人群15个X-STR基因座的遗传多态性,建立法医学应用数据库。方法采用Primer Premier 5.0软件设计多重PCR引物,用4色荧光(FAM、VIC、NED、TET)进行标记,建立多重PCR体系,对山东地区无关汉族人群481例个体(女性295例,男性186例)的15个X染色体上筛选的STR基因座(DXS10011、DXS101、GATA165B12、DXS6795、DXS6800、DXS6801、DXS6803、DXS7132、DXS7133、DXS7423、DXS7424、DXS8377、DXS8378、DXS9898和HPRTB)进行检测。结果所检测的15个X-STR基因座中,GATA165B12、DXS6800、DXS6803、DXS7133与DXS7423在中国山东汉族人群中具有中度多态性,其余10个基因座都具有高度多态性(PIC>0.5,H>0.5)。群体中男性样本之间没有检测到共享单倍型。结论构建的荧光标记复合扩增体系为建立中国山东汉族人群X-STR基因座群体遗传学数据库及其法医学应用提供了有效的手段。
Teeth are one of the most important materials for anthropological studies because they are likely to be preserved in ancient remains.While the frequencies of dental characteristics can provide clues to the phylogeny of populations,genetic studies at the individual level can further reveal the biological mechanisms and evolutionary context of dental characteristics.In this study,by analyzing 38 dental characteristics of 242 Xinjiang Uyghur individuals,we found that(i)the dental characteristics of the Uyghurs showed evidence of admixture between European and East Asian populations.The admixture proportions were in line with those previously reported in population genetic studies;(ii)the Xinjiang Uyghur dental characteristics formed three clusters in pairwise correlation analysis.One of the main clusters consisted of characteristics including incisor shoveling,double shoveling and mesial ridge;and(iii)all the characteristics in this cluster were significantly correlated with the genetic variant EDARV370A.The extracted composite phenotypic factor was also significantly associated with EDARV370A,which explained 18%of the total phenotypic variance.This indicated a pleiotropic effect,i.e.,the same genetic factor affects a number of dental characteristics at the same time.Our results confirmed that EDARV370A,a genetic variant that first originated in East Asia about 30000 years ago,played an important role in incisor shoveling in East Asia.This finding suggested that incisor shoveling in modern humans in East Asia is likely to have appeared after the late Pleistocene.
TAN JingZePENG QianQianLI JinXiGUAN YaQunZHANG LiPingJIAO YiYANG YaJunWANG SiJiaJIN Li
