广西黑衣壮族高胆红素血症新生儿UGT1A1基因突变分析

目的 探讨广西黑衣壮族高胆红素血症新生儿尿苷二磷酸葡萄糖醛酸转移酶1A1（UGT1A1）基因的突变分布特点及其与高胆红素血症的关系。方法 提取黑衣壮族高胆红素血症新生儿（病例组）及对照组新生儿血液基因组DNA各100例,对UGT1A1 启动子TATA盒及所有外显子进行PCR扩增及直接测序。结果 检测到UGT1A1 启动子TATA盒（TA）7插入突变、第1外显子G71R错义突变及第5外显子中4个SNP位点（rs199539868、rs114982090、rs1042640、rs8330）。病例组的G71R等位基因频率显著高于对照组（PP>0.05）。Logistic回归分析显示UGT1A1 TATA盒、G71R、rs1042640及rs8330对新生儿高胆红素血症发生的OR值（95%CI）分别为0.846（0.440,1629）、3.932（1.745,8.858）、0.899（0.364,2.222）。结论 UGT1A1基因（TA）7插入突变与G71R错义突变是广西黑衣壮族高胆红素血症新生儿的常见突变类型,4个SNP 位点（rs199539868、rs114982090、rs1042640、rs8330）为国内首次报道。UGT1A1 G71R错义突变是广西黑衣壮族新生儿高胆红素血症的危险因素。     

UGT1A1基因多态性分析与新生儿高胆红素血症的关系

目的探讨尿苷二磷酸葡萄糖醛酸转移酶1A1(UGT1A1)基因Gly71Arg突变与新生儿高胆红素血症的关系。方法选择2009年6月至2011年4月深圳市第五人民医院出生的新生儿,分为高胆红素血症组(观察组)和对照组。采用突变特异性扩增系统法检测UGT1A1基因Gly71Arg突变。结果观察组168例,对照组157例,UGT1A1基因Gly71Arg突变中A等位基因频率分别为0.27和0.12,差异有统计学意义(χ2=22.58,P<0.05)。与携带G/G基因型新生儿相比,Gly71Arg突变(A/A+G/A)可增加新生儿高胆红素血症的发病风险(OR=2.71,95%CI1.68～4.38)。结论 UGT1A1基因Gly71Arg突变与新生儿高胆红素血症发生相关。     

UGT1A1基因G71R突变与新生儿不明原因严重高胆红素血症相关

目的探讨尿苷二磷酸葡萄糖醛酸转移酶1A1(UGT1A1)基因G71R突变与新生儿严重高胆红素血症的相关性。方法采用病例对照研究的方法,病例组为复旦大学附属儿科医院(我院)收治的不明原因严重高胆红素血症(血清总胆红素水平≥342μmol·L-1)新生儿,采用PCR对外周血UGT1A1基因进行检测。对照组为我院新生儿出生缺陷生物样本数据库中血清总胆红素水平221μmol·L-1病例。病例组及对照组新生儿均要求胎龄≥35周,出生体重≥2 500 g。结果病例组和对照组各65例。UGT1A1 G71R是病例组中最常见的突变类型(73.8%,48/65)。对照组UGT1A1 G71R突变位点与既往Meta分析中提取的中国健康新生儿对比,在基因型分布及等位基因频率上差异均无统计学意义(P0.05)。病例组和对照组UGT1A1基因G71R突变中A等位基因频率分别为0.5和0.15,差异有统计学意义(P0.001),把握度为0.993。与携带G/G基因型新生儿相比,UGT1A1 G71R突变(A/A+G/A基因)可增加新生儿严重高胆红素血症的发病风险(OR=7.373,95%CI:3.395~16.008),把握度为1.0。结论 UGT1A1基因G71R突变与新生儿不明原因严重高胆红素血症相关。     

UGT1A1基因c.1091C>T突变与新生儿不明原因高胆红素血症的相关性研究

目的探讨胆红素-尿苷二磷酸葡萄糖醛酸酰转移酶(UGT1A1)基因c.1091C>T突变与新生儿高胆红素血症的相关性。方法选取湖南省儿童医院普通足月新生儿病房收治的不明原因高未结合胆红素血症新生儿142例作为观察组,随机选取同期无高胆红素血症新生儿71例作为对照组。收集静脉血,提取基因组DNA,PCR扩增UGT1A1基因启动子、外显子及其附近区域并测序。比较两组患儿及正常人群中c.1091C>T突变的等位基因频率,并根据基因测序结果将观察组进行分组,分析c.1091C>T突变与胆红素水平的关系。结果观察组UGT1A1基因c.1091C>T杂合突变15例,纯合突变2例,等位基因频率为0.0669,对照组未检测到c.1091C>T突变,两组间比较差异有统计学意义(P<0.01)。千人基因组计划数据库中东亚人群该位点的基因携带率为0.0109,与观察组比较差异有统计学意义(P<0.01)。观察组中,c.1091C>T突变组总胆红素峰值与野生型组比较,差异有统计学意义(P<0.05)。结论UGT1A1基因c.1091C>T突变在足月新生儿不明原因高胆红素血症中较为常见,该位点突变与新生儿不明原因高胆红素血症的发生相关。     

北方地区新生儿高胆红素血症患儿UGT1A1和OATP2基因突变的研究

目的了解我国北方地区新生儿高胆红素血症的形成与尿苷二磷酸葡萄糖醛酸转移酶1A1(UGT1A1)和有机阴离子转运载体2(OATP2)基因突变的关系。方法应用聚合酶链反应-限制性片段长度多态性方法测定新生儿重症高胆红素血症、高胆红素血症及非高胆红素血症患儿的UGT1A1基因211位点(Gly71Arg)突变及OATP2基因388位点(Asn130Asp)突变,并检验各组基因型分布及等位基因频率差异。应用Logistic回归模型,分析两种基因突变对高胆红素血症的影响。结果重症高胆红素血症组68例,高胆红素血症组95例,对照组63例。重症高胆红素血症组和高胆红素血症组UGT1A1基因211位点突变率和OATP2基因388位点突变率均高于对照组(36.8%、26.8%比14.3%,25.7%、25.8%比9.5%,P均<0.05);重症高胆红素血症组和高胆红素血症组差异无统计学意义(P>0.05)。Logistic回归分析显示,UGT1A1基因211位点突变和OATP2基因388位点突变是新生儿重症高胆红素血症的危险因素,OR值(95%CI)分别为5.052(2.383～10.713)和2.692(1.236～5.862)(P=0.001和0.013)。结论携带UGT1A1基因211位点突变及OATP2基因388位点突变与新生儿高胆红素血症的形成有一定关系。     

胆红素-尿苷二磷酸葡萄糖醛酸基转移酶G71R基因型对广西地区新生儿黄疸程度的影响

目的 探讨胆红素-尿苷二磷酸葡萄糖醛酸基转移酶1A1(UGT 1A1)基因突变对广西新生儿黄疸的影响.方法 收集73例高胆红素血症新生儿及31例健康新生儿外周血,应用突变特异性扩增系统(amplification refractory mutation system,ARMS)法及直接测序法对所有新生儿行UGT1A1基因G71R突变检测,分析胆红素脑病发生率,胆红素峰值及总胆红素(total serum bilirubin,TSB)>20 mg/dl的机会比.结果 (1)本研究人群G71R等位基因频率为0.1915,病例组为0.2329,健康对照组为0.097,病例组的G71R等位基因频率显著高于健康对照组(P<0.05).(2)G71R纯合子的胆红素脑病发病率及72 h的TSB浓度(28.57%,23.12±4.58 mg/dl)均高于野生型组(0%,17.68±2.69 mg/dl),差异有统计学意义(P<0.001).(3)G71R纯合子组中5例的TSB>20 mg/dl,G71R纯合子TSB>20 mg/dl的机会比(odds ratio,OR)为7.955,总体机会比95%可信区间(confidence interval,CI)为(1.349,46.899).结论 G71R突变与本地新生儿黄疸的发病存在相关性.G71R纯合子的胆红素脑病发病率及生后72 h的TSB较对照组及野生型增高.G71R纯合子发生TSB>20 mg/dl的危险性是野生型的7.955倍.     

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目的探讨葡萄糖醛酸转移酶1A1(UGT1A1)基因G71R突变、葡萄糖-6-磷酸脱氢酶(G6PD)缺陷对新生儿生后前3d胆红素浓度的影响.方法测定81例新生儿脐血的G6PD活性及G71R基因型,分组比较生后前3d光疗前胆红素值的组间差异.用等位基因特异性寡核苷酸探针点杂交法(ASO)确定G71R基因型.结果在G71R野生型新生儿中,G6PD缺乏组与G6PD正常组相比,生后前3d胆红素值间无统计学差异.G6PD正常新生儿中,G71R突变纯合子或杂合子的新生儿生后前3d胆红素浓度与G71R正常野生型新生儿相比无统计学差异.G6PD缺陷新生儿中,同时合并有G71R突变纯合子或杂合子的新生儿组生后第2天、第3天胆红素浓度高于G71R正常野生型新生儿组.结论G6PD缺乏与G71R基因突变并存加重新生儿黄疸程度.     

新生儿高未结合胆红素血症遗传因素的研究

目的：探讨尿苷二磷酸葡萄糖醛酸转移酶1A1（UGT1A1）Gly71Arg、TATA盒基因突变和葡萄糖-6-磷酸脱氢酶（G6PD）基因突变与新生儿高未结合胆红素血症的关系。方法：UGT1A1 TATA盒、外显子1、外显子5和G6PD基因外显子12经PCR扩增和测序,构建突变样本的克隆,对其进行验证。分析病例组及对照组UGT1A1 Gly71Arg和TATA盒基因多态性频率的差异,应用logistic回归分析基因突变对新生儿高未结合胆红素血症发生的影响。结果：病例组UGT1A1 Gly71Arg基因多态性的基因型分布与对照组比较差异有统计学意义（P0.05）。Logistic回归分析显示UGT1A1 Gly71Arg、TATA盒基因和G6PD基因突变对新生儿高未结合胆红素血症发生的OR值（95％CI）分别为5.468（2.274,12.818）、0.688（0.266,1.778）和5.081（1.070,24.133）。结论：UGT1A1 Gly71Arg和G6PD基因突变可能是新生儿高未结合胆红素血症发生的原因。     

UGT1A1 G71R 基因多态性对母乳性黄疸程度的影响

目的探讨葡萄糖醛酸转移酶UGT1A1 G71R基因突变对晚发型母乳性黄疸患儿黄疸程度的影响。方法收集晚发型母乳性黄疸患儿56例,用套式PCR后限制性片段长度多态性分析(RFLP)确定UGT1A1 G71R基因型,通过全自动生化分析仪测定胆红素水平。结果UGT1A1 G71R突变纯合子5例,杂合子24例,野生型27例。UGT1A1 G71R等位基因频率为30.36%。UGT1A1 G71R纯合子或杂合子组(n=29)与UGT1A1G71R野生组(n=27)的胆红素水平分别为(237.85±31.92)μmol/L、(214.49±32.48)μmol/L,前者明显高于后者(t=2.7141,P=0.0089)。结论晚发型母乳性黄疸患儿如存在UGT1A1 G71R基因突变,临床上黄疸程度较重。     

遗传因素在广西新生儿高胆红素血症中的作用

目的探讨UGT1A1 G71R突变、OATP2A388G突变和G-6-PD缺乏对在广西新生儿高胆红素血症发病的作用。方法用四氮唑蓝定量法（NBT法）测定G-6-PD酶活性。聚合酶链反应-等位基因特异性寡核苷酸探针点杂交（PCR-ASO）法确定G71R基因型。限制性片段长度多态性分析（RFLP）检测A388G基因型。测定109例新生儿脐血的G-6-PD活性及G71R基因型,其中101例同时检测了A388G基因型。据G-6-PD活性及G71R或A388G基因型分组,分析UGT1A1G71R突变、OATP2A388G突变和G-6-PD缺乏与足月新生儿高胆红素血症之间关系。结果G71R等位基因频率在G-6-PD缺乏组为22．03％,在G-6-PD正常组为28．00％。G-6-PD缺乏共存有G71R突变纯合子或杂合子的新生儿高胆红素血症发生率（95．50％）高于G-6-PD正常且G71R为野生型的新生儿（53．90％）,x^2=10．45,P=0．0012,前者发生高胆红素血症的机会比（95％可信区间）[OR（95％CI）]为18．00（2．12,152．9）。A388G等位基因频率在G-6-PD缺乏组为20．O％,在G-6-PD正常组为18．5％。G-6-PD缺乏共存有A388G突变新生儿的高胆红素血症发生率（90．0％）高于G-6-PD正常且A388G为野生型的新生）L（44．80％）,X2=10．39,P=0．0013,前者发生高胆红素血症的伽（95％CT）为11．08（2．15,56．48）。结论G71R突变与G-6-PD缺乏共存或A388G突变与G-6-PD缺乏共存对广西足月新生儿高胆红素血症的发生有协同作用。     

Neonatal hyperbilirubinemia and the bilirubin uridine diphosphate-glucuronosyltransferase gene: The common −3263T > G mutation of phenobarbital response enhancer module is not associated with the neonatal hyperbilirubinemia in Japanese

BACKGROUND: Neonatal hyperbilirubinemia is frequent and severe in Japanese newborns. Previously, it has been reported that half of the Japanese neonates with severe hyperbilirubinemia carried the 211G > A (p.G71R) mutation of the bilirubin uridine diphosphate-glucuronosyltransferase (UGT1A1) gene causing Gilbert syndrome. Recently, it was reported that the -3263T > G mutation in the phenobarbital response enhancer module in UGT1A1 was associated with the majority of cases of Gilbert syndrome. The gene frequency of the -3263T > G mutation was determined and the relation with neonatal hyperbilirubinemia in Japanese was studied. METHODS: UGT1A1 in 119 neonates born at Yamagata University Hospital, Yamagata, Japan, and 26 subjects who had undergone phototherapy due to severe hyperbilirubinemia at four other hospitals were studied. The gene frequency of -3263T > G mutation in Japanese, Korean, Chinese and German healthy adult controls was also determined. Hyperbilirubinemia was assessed with a Jaundice Meter and UGT1A1 was analyzed by sequence determination or restriction enzyme method. RESULTS: The gene frequency of the -3263T > G mutation was 0.26 in Japanese subjects and was similar to the prevalence in Korean, Chinese and German populations. However, there was no significant increase in the gene frequency of the mutation in the neonates who required phototherapy for hyperbilirubinemia compared to that in the neonates without severe hyperbilirubinemia. In addition, neonates with or without the mutation did not show a significant change in the level of bilirubin and the mutation also did not show a synergic effect with the 211G > A mutation on the level of bilirubin. CONCLUSION: The -3263T > G mutation is not likely to be associated with the neonatal hyperbilirubinemia in Japanese.     

Frequencies of A(TA)7TAA, G71R, and G493R mutations of the UGT1A1 gene in the Malaysian population

BACKGROUND: Gilbert syndrome is caused by defects in the uridine diphosphate glucuronosyltransferase 1A1 (UGT1A1) gene. These mutations differ among different populations and many of them have been found to be genetic risk factors for the development of neonatal jaundice. OBJECTIVES: The objective was to determine the frequencies of the following mutations in the UGT1A1 gene: A(TA)7TAA (the most common cause of Gilbert syndrome in Caucasians), G71R (more common in the Japanese and Taiwanese population), and G493R (described in a homozygous Malay woman with Crigler-Najjar syndrome type 2) in a group of Malaysian babies with hyperbilirubinemia and a group of normal controls. METHODS: The GeneScan fragment analysis was used to detect the A(TA)7TAA variant. Mutation screening of both G71R and G493R was performed using denaturing high performance liquid chromatography. RESULTS: Fourteen out of fifty-five neonates with hyperbilirubinemia (25%) carried the A(TA)7TAA mutation (10 heterozygous, 4 homozygous). Seven out of fifty controls (14%) carried this mutation (6 heterozygous, 1 homozygous). The allelic frequencies for hyperbilirubinemia and control patients were 16 and 8%, respectively (p=0.20). Heterozygosity for the G71R mutation was almost equal among both groups (5.5% for hyperbilirubinemia patients and 6.0% for controls; p=0.61). One subject (1.8%) in the hyperbilirubinemia group and none of the controls were heterozygous for the G493R mutation (p=0.476). CONCLUSIONS: The A(TA)7TAA seems more common than the G71R and G493R mutations in the Malaysian population.     

Cord blood bilirubin level in relation to bilirubin UDP-glucuronosyltransferase gene missense allele in Chinese neonates

AIM: To investigate bilirubin UDP-glucuronosyltransferase (UGT1A1) gene allele in healthy Chinese neonates, their cord bilirubin level and the subsequent hyperbilirubinemia to determine relationships among them. METHODS: Cord blood of 48 neonates was obtained to determine the exon 1 of UGT1A1 gene, total serum bilirubin, albumin, glutamic-pyruvic transaminase (GPT), glutamic-oxalacetic transaminase (GOT) and haemoglobin (Hb) concentration. Neonatal jaundice was assessed by measurement of transcutaneous bilirubin (TCB) and serum bilirubin. Neonates were divided into two groups according to mutant or normal allele to compare the variables. RESULTS: Nineteen infants had the nucleotide 211 G-->A allele, 3 had the heterozygous variation (686C-->A, 845 A-->T, 231G-->A). In the 211 A allele group, cord bilirubin was significantly higher than in the 211 G allele group (p = 0.034), but there were no differences in albumin (p = 0.678), GPT (p = 0.460), GOT (p = 0.440) and Hb (p = 0.886). The TCB (at 48, 96 h), the frequency of the hyperbilirubinemia and prolonged jaundice were also significantly higher in the 211 A allele group. CONCLUSIONS: The UGT1A1 gene codon G71R allele is a risk factor for neonatal hyperbilirubinemia in the Chinese population. Its effect on bilirubin metabolism may present early on, as well as late in foetal life.     

Relationship between bilirubin UDP-glucuronosyl transferase 1A1 gene and neonatal hyperbilirubinemia

The variation rate within the coding region of UDP-glucuronosyl transferase 1A1 (UGT1A1) gene in Taiwan Chinese was found to be 29.3%. This study sought to determine whether that high variation rate of UGT1A1 gene is a risk factor for neonatal hyperbilirubinemia. The study subjects consisted of 123 newborn infants suffering from unconjugated hyperbilirubinemia who had no known risk factors for hyperbilirubinemia and 218 healthy control neonates. The promoter area, exons 1 to 4, coding region of exon 5, and the flanking intronic regions in UGT1A1 gene were determined by the PCR in all subjects. Wild UGT1A1 gene, variation in the promoter, variation at nucleotide 211, variation at nucleotide 1091, and compound heterozygous variation of UGT1A1 gene were found. The percentage of neonates with wild UGT1A1 gene and the percentage of neonates with variation at nucleotide 211 were significantly different between the study subjects and controls. The percentages with bilirubin >or=342 micro M (20.0 mg/dL) and with persistent hyperbilirubinemia in the subjects carrying homozygous variation at nucleotide 211 (Gly71Arg) were significantly higher than the neonates carrying wild type or other genotypes. In conclusion, this study has demonstrated that variation at nucleotide 211 of the UGT1A1 gene is a risk factor for the development of neonatal hyperbilirubinemia. Pediatricians should closely follow hyperbilirubinemic newborn infants who carry homozygous 211 G to A variation in UGT1A1 gene.