探讨载脂蛋白B（apolipoprotein B，apoB）基因单体型与维吾尔族自然长寿之间的关系．选择新疆和田地区191名年龄90岁以上的健康维吾尔族个体为研究对象，另选53名年龄65—70岁、民族、性别、地域相匹配的正常个体为对照．采用PCR—SSP（sequence specific primer），PCR—RFLP（restriction fragment length polymorphism）和PCR-直接测序（PCR—sequencing）等技术对apoB基因第1外显子5＇端信号肽插入／缺失（insertion／deletion，PD）、第26外显子Xba Ⅰ限制性片段长度多态性（restriction fragment length polymorphisms，Xba Ⅰ—RFLP）和第29外显子3＇端可变数目重复序列（vaffable number of tandemly repeat，VNTR）进行分型．经Logistic回归分析显示，长寿组apoB基因X^＋X^＋基因型频率显著高于对照组；M，L的等位基因频率和其组成的基因型频率显著增高；在单体型分析中，长寿组中由X^＋和M等位基因组成的单体型频率显著增高，而由X^-和S等位基因组成的单体型频率显著降低（均P〈0．05）．研究认为：等位基因M，L，基因型X^＋X^＋，MM，ML，LL和单体型I—X^＋-M，X^＋-M与自然长寿显著正相关，可能为长寿的保护因素，而等位基因S，基因型SS和单体型X^＋-S，D—S和D—X^＋-S则可能是影响长寿的不利因素．
Objective To clarify the role of sexual related Y (SRY) gene detection in the diagnosis of gonadal *** Sixteen cases of gonadal dysgenesis were included in this study: 5 with androgen insensitivity syndrome, 1 with ...
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Objective To clarify the role of sexual related Y (SRY) gene detection in the diagnosis of gonadal *** Sixteen cases of gonadal dysgenesis were included in this study: 5 with androgen insensitivity syndrome, 1 with 17-α-hydroxylase deficiency, 4 with true hermaphrodite, 2 with 45,X/46,XY gonadal dysgenesis, 1 with 45,X gonadal dysgenesis, 1 with XY pure gonadal dysgenesis, 1 with testicular regression, and 1 XY female who gave birth to a normal baby. SRY gene was detected by using polymerase chain reaction (PCR) in blood and gonad samples and by direct sequencing of the SRY *** Among the 16 cases, 15 were blood SRY positive, among which 13 (86.7%) showed the presence of testicular tissue, and 2 showed ovaries without testicular tissue. One SRY negative case showed the presence of testicular tissue. In 3 cases, SRY detection in gonadal tissue correlated with pathological findings but not with blood karyotype. The correlation between peripheral blood SRY and the pathology of the gonads was 81.25% and the correlation between the presence of peripheral blood Y chromosome and pathology of the gonads was 68.75%. Sequencing of the SRY motif in an XY female who gave birth to a normal baby showed no *** SRY detection is more sensitive and specific than blood karyotype in the prediction of the presence of testicular tissue. Peripheral blood karyotype does not necessarily reflect gonadal type. There may be testicular related factors other than the SRY gene.
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