硒蛋白单核苷酸多态性与幽门螺旋杆菌感染的关联性

目的 探讨硒蛋白S（selenoprotein S,SelS）rs34713741位点、硒蛋白P（selenoprotein P,Sepp1）rs7579位点单核苷酸多态性（single nucleotide polymorphisms,SNPs）与幽门螺旋杆菌（Helicobacter pylori,Hp）感染的关联性。方法 采用等位基因特异性PCR（allele - specific PCR,AS - PCR）技术检测195例Hp感染者和200例对照者SelS（rs34713741）、Sepp1（rs7579）SNPs,统计分析其与Hp感染的关系。结果 rs34713741位点SelS基因SNP与Hp感染存在关联（P＜0.05)。与C等位基因携带者相比,携带T等位基因者感染Hp风险增高1.578倍（OR = 1.578,95%CI:1.191～2.091）;与CC基因型者相比,CT和TT基因型者感染Hp风险均增高（OR = 1.890,95%CI:1.134～3.148;OR = 1.807,95%CI:1.140～2.864）;rs7579位点Sepp1基因SNP与Hp感染无关联（P＞0.05)。结论 SelS基因rs34713741位点T等位基因提高了Hp感染风险,是Hp感染遗传易感基因。     

DNA analysis for the Dombrock polymorphism

BACKGROUND: RBC typing for Do(a) and Do(b) is notoriously difficult, and inaccurate typing can predispose patients to hemolytic transfusion reactions. The DO1/DO2 polymorphism is associated with three nucleotide changes: 378 C>T, 624 T>C and 793 A>G. While the 378 C>T- and 624 T>C-containing codons are silent mutations, the 793 A>G polymorphism in codon 265 encodes asparagine for Do(a) and aspartic acid for Do(b). STUDY DESIGN AND METHODS: Described here are two PCR-RFLP assays, one using the Mnl I site associated with 624C (DO2) and the other altering two nucleotides within the sense primer, which allows recognition of 793G by the Eam 1105 I. RESULTS: The assays have been performed on over 100 samples for which the RBC typing of one or both antigens was known. Eight samples had been historically mistyped by hemagglutination. CONCLUSION: This RFLP assay provides a practical method for typing donor blood for Dombrock alleles.     

硒蛋白S基因多态性与布鲁氏菌病遗传易感性的关联性

目的 检测内蒙古包头地区布鲁氏菌病患者硒蛋白S（selenoprotein S,SelS）基因rs28665122、rs34713741位点基因型和等位基因分布频率,探讨SelS基因多态性与本地区布鲁氏菌病患者遗传易感性的关联性。方法 采用一种快速点突变检测技术-等位基因特异性PCR（allele - specific PCR,AS - PCR）技术检测32例慢性期布鲁氏菌病患者和30例健康对照者SelS基因（rs28665122、rs34713741）基因型和等位基因分布频率。结果 布鲁氏菌病患者组与对照组SelS基因rs28665122位点GG、GA、AA基因型及G、A等位基因频率比较无统计学差异（χ2分别为0.203,0.852,均P＞0.05 ）;rs34713741位点CT、CC、TT基因型和C、T等位基因分布频率比较存在统计学差异（χ2分别为9.209,6.580,均P＜0.05）,与C等位基因相比,携带T等位基因者感染布鲁氏菌风险增高3.194倍（OR = 3.194,95%CI:1.489～6.847）,与CC基因型相比,CT和TT基因型者感染布鲁氏菌风险均增高（OR = 3.273,95%CI:0.876～12.223;OR = 4.364,95%CI:1.217～15.641）。结论 本地区布鲁氏菌病与SelS基因rs34713741位点基因多态性有关联,T等位基因可能是其风险易感基因。     

大肠癌中DCC基因201密码子点突变的研究

目的：探寻结直肠癌缺陷基因（ＤＣＣ基因）２０１密码子在大肠癌中的突变规律。方法：采用等位基因特异性ＰＣＲＡＳ－ＰＧＲ结合ＳａｌⅠ酶切方法检测３５例大肠癌组织及配对的癌旁粘膜ＤＣＣ基因２０１密友子突变情况。结果：ＤＣＣ基因２０１密码子纯合突变率大肠癌（４０％）显高于癌旁粘膜（２．８％）,（Ｐ〈０．０５）。且与肿瘤侵袭深度、Ｄｕｋｅｓ分期相关,至少有１７例（４９％）大肠癌与相应癌旁粘膜相比增获一个密     

Detection of MYD88 L265P mutations in formalin-fixed and decalcified BM biopsies from patients with lymphoplasmacytic lymphoma

The diagnosis of bone marrow (BM) infiltration by Waldenström macroglobulinemia (WM)/lymphoplasmacytic lymphoma (LPL) poses a diagnostic challenge in hematopathology. No definitive morphology or immunophenotype is able to distinguish between infiltration of paraffin-embedded BM sections by WM/LPL and other indolent lymphomas, in particular those of the splenic marginal zone (SMZL) which may also show plasmacytic maturation. An oncogenic gain-of-function mutation (L265P) in the human MYD88 gene has been found to be present in most cases of WM/LPL, yet is absent in most other cases of B-cell chronic lymphoproliferative disorders (LPD), including SMZL. Here, we compare two newly developed diagnostic protocols for detection of this mutation in paraffin-embedded archival tissues which are particularly applicable to decalcified BM biopsies. Sanger sequencing can easily detect levels of BM infiltration above 15% by WM lymphoplasmacytic cells, while the allele-specific PCR can detect the L265P mutation in BM infiltrations below 1% of lymphoma cells. We show that these methods are easily applicable to archival BM specimens and markedly improve diagnostic accuracy of BM infiltrations by indolent B-cell lymphomas.     

一成人型多囊肾家系的遗传检测及产前诊断

目的 对一常染色体显性遗传性多囊肾病(ADPKD)家系进行致病基因突变鉴定,并对先证者妻子首次妊娠进行产前诊断.方法 用聚合酶链式反应,通过微卫星标记进行基因定位、DNA序列测定,确定基因突变;用AS-PCR对家系其他患者成员进行突变点检测和筛查;联合应用突变检测和连锁分析进行产前诊断.结果 该家系中多囊肾疾病的致病基因为PKD2,突变为外显子5中c.1249C>T(p.R417X);胎儿产前诊断结果显示未获得致病突变.结论 该家系的致病突变为c-12A9C>>(p.R417X),成功进行了产前诊断.     

CYP1A1和CYP1B1基因多态性与RPL易感性

目的 探讨CYP1A1、CYP1B1基因多态性与复发性流产(RPL)遗传易感性关系,为预防和治疗该病提供新靶点。方法 本研究采用等位基因特异性PCR(As-PCR)和聚合酶链反应-限制性片断长度多态性(PCR-RFLP)方法,针对CYP1A1基因MspΙ酶切位点和CYP1B1 L432V多态位点,检测81例患有原因不明RPL病例组和98名有生育史健康女性对照组之间差异。结果 RPL组和对照组CYP1A1 MspΙ位点3种基因型m1/m1、m1/m2、m2/m2分布频率差异无统计学意义(χ²=0.335,P>0.05);CYP1B1 L432V多态位点3种基因型C/C、C/G、G/G在病例组和对照组分布差异有统计学意义(χ²=7.467,P<0.05);2组间C、G等位基因分布差异有统计学意义(χ²=9.129,P=0.003);G/G、C/G基因型与C/C基因型比较,RPL危险度分别提高2.620、1.954倍;等位基因G使RPL危险性增加2.038倍。结论 CYP1B1 L432V突变基因型增加RPL发病风险,尚不能认为CYP1A1基因MspI位点多态性与RPL易感性有关。     

结合多重链置换扩增和等位基因特异性PCR从单细胞中扩增脊髓性肌萎缩症运动神经元生存基因

目的:建立结合多重链置换扩增(multiple displacement amplification,MDA)全基因组扩增法和等位基因特异性PCR(allele-specific PCR,AS-PCR)对单细胞进行脊髓性肌萎缩(spinal muscular atrophy,SMA)诊断的方法。方法:对脊髓性肌萎缩症运动神经元生存基因(survival motor neuron gene1,smn1)7号外显子纯合缺失皮肤成纤维细胞及正常的皮肤成纤维细胞使用MDA法进行全基因组扩增,使用AS-PCR检测扩增产物的smn1和smn2基因,同时扩增D5S435、D5S351这2个微卫星位点,评估扩增效率、等位基因脱扣(allele dropout,ADO)率及污染检测。结果:对18个SMA细胞和21个smn1基因正常的细胞进行扩增。smn1和smn2基因扩增成功率分别为90.4%(19/21)和94.8%(37/39)。2个微卫星的扩增成功率为82.1%(32/39)和88.9%(16/18),ADO率分别为16.22%(6/37)和12.5%(2/16)。总扩增成功率为88.89%(104/117),总ADO率为15.09%(8/53)。结论:建立了结合MDA和等位基因特异性PCR对单个细胞进行smn1、smn2基因的扩增方法,为SMA单细胞植入前诊断奠定了基础。     

Salt-wasting 21-hydroxylase deficiency congenital adrenal hyperplasia and pyloric stenosis in two Hispanic brothers

The differential diagnosis of vomiting and dehydration in the first month of life includes congenital adrenal hyperplasia (CAH) and pyloric stenosis (PS). Each diagnosis may mask the presence of the other, requiring careful evaluation and follow-up. We document the occurrence of CAH and PS in two Hispanic siblings.