XPC基因多态性与男性不育的相关性研究

目的:位于XPC基因外显子区域Ala499Val(C>T)和Lys939Gln(A>C)两个非同义突变的单核苷酸多态性位点在人群中研究广泛,具有潜在的功能性,其多态的变化影响到XPC基因的结构和功能,进而影响到DNA损伤修复率。本文探讨了这两个位点基因多态性在中国汉族人群中的分布及其与男性不育发病风险的关联。方法:采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法,分析318例男性不育患者和228例正常对照男性中XPC基因两个多态性位点的基因分型和等位基因频率,以及这两个位点单独和联合作用与男性不育的相关性。结果:在Ala499Val(C>T)多态性位点中,CC、CT、TT三种基因型频率在病例和对照组中的分布存在显著性差异(P=0.020)。携带TT基因型的个体罹患男性不育的风险是CC基因型个体的0.49倍(95%CI=0.23～0.88),是(CC+CT)基因型个体的0.39倍(95%CI=0.22～0.71)。Lys939Gln(A>C)多态性位点与男性不育的患病风险无显著性关联。联合两个位点分析,个体携带1～4个危险位点患男性不育的风险是携带零个的2.75倍(95%CI=1.50～5.04)。结论:XPC基因Ala499Val(C>T)基因多态性与男性不育的发病风险存在关联,可能是我国汉族人群男性不育的遗传易感因素之一。     

鱼精蛋白基因多态性与男性不育相关性研究进展

鱼精蛋白(PRM)是精子中含量最丰富的富含精氨酸核蛋白,在精子生成过程中发挥重要作用。在精子发生过程后期PRM取代组蛋白,促使精子中的核基质与核蛋白之间的结合更紧密,从而使核内染色质高度富集、浓缩,防止精子基因组因内部或外部因素而诱发突变。随着DNA测序技术的发展,研究PRM基因多态性与男性生育关系成为一大热点。许多研究表明,PRM1基因rs2301365位点是男性不育的危险因素,会使男性罹患不育的风险增加27%~66%;PRM1基因rs737008位点和PRM2基因rs1646022位点在亚洲人中是男性罹患不育的保护因素;PRM1/PRM2比值也与男性不育存在强相关性。本文综述了PRM基因多态性与男性不育的研究进展。     

常染色体DAZL基因单核苷酸多态性与男性不育相关性研究

目的:探讨常染色体DAZL基因单核苷酸多态性(SNP)与男性不育的关系。方法:收集东北地区男性不育症患者(不育组,n=144)和健康并已育有一子女的男性(生育组,n=53)精液标本,不育组按照WHO(1999)少、弱和畸形精子分类标准分成少弱畸形精子症组(n=17)、少弱精子症组(n=33)、弱畸形精子症组(n=13)、弱精子症组(n=54)和非少弱畸形精子不育症组(n=27),应用聚合酶链反应-限制性片段长度多态性分析(PCR-RFLP)筛选SNP260多态性,应用聚合酶链反应-单链构象多态性分析(PCR-SSCP)筛选SNP386多态性,并测序验证和进行统计学分析。结果:不育组及生育组中均检测到SNP260A→G多态性,统计学分析差异无显著性(P>0.05),但在少弱畸形精子症组SNP260AG基因型比例大于其他各组;各研究组均未发现SNP386多态性。结论:SNP260和SNP386多态性与中国东北地区男性不育无相关性。前者AG基因型与少弱畸形精子的关系尚需进一步证实;后者多态性可能仅分布在台湾的一些狭小地区,两者均不能作为东北地区男性不育基因诊断的分子标志。     

精子特异性表达基因的遗传多态性与男性不育

精子发生需要精子特异基因的表达,这些特异表达基因的遗传多态性可能影响精子的发生,导致男性不育。国内外学者已对精子发生特异表达的一些候选基因进行多态性研究,分析其多态性与不育的相关性及其可能的致病机制,进一步从基因角度阐明不育的病因。本文对于精子发生相关的基因多态性研究进展做一综述。     

DNA损伤修复基因多态性与男性不育的研究进展

DNA修复机制的缺陷能引起生殖细胞DNA损伤的增加,从而导致精子产生过程出现异常和男性不育.高保真DNA修复对维持生殖细胞基因组的完整性和质量至关重要.因此,正常的精子生成过程中DNA损伤修复系统是一个关键因素,参与生殖细胞DNA损伤修复基因功能的异常会造成精子数量减少以及精子异常.本文主要从DNA损伤修复基因XRCC...     

谷胱甘肽S-转移酶基因多态性与男性不育

男性不育的发生是遗传因素与环境因素相互作用的过程,机体对内外源性化学物质的代谢和解毒能力影响个体对男性不育的易感性。谷胱甘肽S-转移酶(GSTs)属于机体Ⅱ相解毒酶系统,其参与细胞对外源性化学物质和人工合成有机物质解毒的各个生理阶段。研究发现,GSTs基因多态性与男性不育有一定的相关性。在同一地区人群中,GSTs基因多态性对男性不育的易感性具有相似性,也存在不一致性;在不同地区人群中,GSTs基因多态性对男性不育的易感性不一致,也存在相似性。因此,GSTs基因多态性对男性不育患者的易感性在不同人群中存在差异。     

男性不育患者精子DNA中8—羟基脱氧鸟苷水平及与精液参数的相关性

本文应用高压液相 电化学 (HPLC EC)技术对 5 2名男性不育患者精子DNA中 8 羟基脱氧鸟苷 (8 OHdG)进行测定 ,同时检测精液量、精子密度、精子活率、正常形态精子率 ,及头部精子畸形等精液参数 ,并进行相关性分析。结果显示 ,当精子DNA中 8 OHdG超过 10 .5 0时 ,其头部畸形率明显增加。精子DNA中 8 OHdG与精液量 (r =- 0 .4 7,P <0 .0 0 1)、正常形态精子率 (r=- 0 .36 ,P <0 .0 1)成一定的负相关 ,且与头部畸形精子率成正相关 (r =0 .6 9,P <0 .0 0 1)。结果提示 ,精子DNA中 8 OHdG与精液质量存在一定的相关性 ,表明精液质量的下降与精子DNA的损伤存在一定联系 ,而内源及外源性活性氧是可能的原因之一 ,其可能的机制尚需进一步研究。     

TP53基因rs1042522单核苷酸多态性与男性不育相关性研究

目的:探讨肿瘤蛋白p53(TP53)基因rs1042522位点单核苷酸多态性与男性不育的关系。方法:采用病例-对照研究,收集南京地区特发性男性不育患者380例(病例组),有生育史的健康男性398例(对照组);并将病例组分为无精子症组(n=140)和少精子症组(n=240)。用Sequence Mass Array技术检测TP53基因rs1042522位点的基因型,通过Logistic回归分析该位点多态性与男性不育的相关性。结果:病例组与对照组前向运动精子百分率[(10.38±5.57)%vs(42.55±9.57)%]、精子浓度[(13.13±24.96)×106/ml vs(77.34±49.24)×106/ml]、T[(14.07±5.36)nmol/L vs(11.89±4.50)nmol/L]、FSH[(16.80±18.20)U/L vs(4.55±7.17)U/L]存在显著性差异(P0.05)。经Logistic回归分析,未发现各基因型与男性不育有统计学意义的相关性,亚组分析也未发现相关性。结论:TP53基因rs1042522位点的单核苷酸多态性与男性不育无显著相关性。     

乙酰基转移酶2基因单核苷酸多态性与男性不育发病风险的相关性研究

目的:探讨乙酰基转移酶2基因(NAT2)的rs1799930和rs1799931单核苷酸多态性与南京地区男性不育发病风险的相关性。方法:采用病例-对照研究,选取636例特发性男性不育患者作为病例组,年龄20~44(28.45±4.38)岁;442例有生育史的健康男性作为对照组,年龄21~35(28.30±3.46)岁。取外周静脉血,用Sequenom Mass Array技术检测这2个位点的基因型,Logistic回归模型分析不同基因型与男性不育的相关性,单倍型分析2个位点连锁效应和4种基因型组合与男性不育的关系。结果:病例组和对照组精子浓度[(32.32±45.49)×10~6/ml vs(72.77±45.21)10~6/ml]、前向运动精子百分率[(15.29±5.06)%vs(42.02±9.04)%]、卵泡刺激素水平[(14.69±12.37)U/L vs(4.72±2.51)U/L]差异有统计学意义(P均0.01),其他参数病例组与对照组无统计学意义的差异。2个位点各基因型频率和等位基因频率在各种模型中均与男性不育无统计学意义的相关性;单倍型分析表明,rs1799930和rs1799931存在连锁效应(D'=0.998,r_2=0.05),但4种基因型组合与男性不育也无明显相关性。结论:NAT2基因的rs1799930和rs1799931位点的单核苷酸多态性与特发性男性不育的发病风险无相关性。该位点与男性不育具体关系有待更大样本量加以证实。     

KITLG基因rs995030和rs4474514位点单核苷酸多态性与男性不育相关性研究

目的:探讨酪氨酸激酶受体的特异性配体(KITLG)基因rs995030和rs4474514位点单核苷酸多态性与男性不育之间的相关性。方法:收集南京周边地区特发性男性不育患者360例(病例组),已生育的健康男性338例(对照组);按照WHO《人类精液检查与处理实验室手册》第5版,将病例组分为无精子症组(n=143)、严重少精子症组(n=159)和少精子症组(n=58)。收集所有研究对象的临床基本资料,并采集病人外周血提取基因组DNA,用Sequence Mass-Array技术检测KITLG基因rs995030和rs4474514位点的基因型,通过Logistic回归分析两位点基因多态性与男性不育的相关性。结果:病例组与对照组比较,精子浓度[(13.23±24.52)×10~6/ml vs(78.74±61.25)×10~6/ml]、前向运动精子百分率[(18.71±15.19)%vs(39.36±9.75)%]、FSH[(16.09±17.31) IU/L vs(4.56±2.41) IU/L]差异显著(P0.01)。经Logistic回归分析,未发现各基因型与男性不育有统计学意义的相关性,亚组分析也未发现相关性。结论:KITLG基因rs995030和rs4474514位点的单核苷酸多态性与男性不育无显著相关性,后续可以通过扩大样本量以及样本选取范围来进一步研究验证。     

The hOGG1 Ser326Cys polymorphism and male subfertility in Taiwanese patients with varicocele

To investigate the association between the human 8‐oxoguanine DNA glycosylase 1 (hOGG1) gene Ser326Cys polymorphism and male subfertility in Taiwanese patients with varicocele, we made a prospective study. Ninety young male patients with varicocele (group 1), 50 young male patients with subclinical varicocele (group 2) and 30 normal young male patients without varicocele (group 3) were recruited in this study. The hOGG1 null homozygous genotype (Cys/Cys) and the occurrence of a 4,977‐bp deletion in mitochondrial DNA and mitochondrial copy number in spermatozoa were determined by polymerase chain reaction. The 8‐hydroxy‐2′‐deoxyguanosine (8‐OHdG) content of DNA in the spermatozoa was measured using high‐performance liquid chromatography, and total antioxidant capacity (TAC) of seminal plasma was detected electrochemically. The rates of male subfertility were 31.1% (28/90) in group 1 and 22% (11/50) in group 2. Of 39 subfertile men, 74.4% (29/39) had the hOGG1 Cys/Cys genotype. Patients in groups 1 and 2 with hOGG1 Cys/Cys genotype had significantly higher 8‐OHdG content in sperm DNA, lower mitochondrial copy number in spermatozoa and lower TAC in seminal plasma than those with Ser/Ser or Ser/Cys genotype. Clinicians should pay more attention to patients with varicocele with the hOGG1 Cys/Cys genotype.     

亚甲基四氢叶酸还原酶单核苷酸多态性与男性不育研究进展

许多不明原因的男性不育是由于参与精子发生过程中相关基因的突变而导致其生精过程异常。亚甲基四氢叶酸还原酶(MTHFR)参与DNA、RNA、蛋白质代谢过程,并与精子生成密切相关。已发现MTHFR基因有20种以上单核苷酸多态性。目前研究提示,MTHFRC677T、A1298C多态性与男性不育可能存在密切关系。本文对这两种多态性与男性不育的关系做一综述,并指出新发现的MTHFRG1793A多态性与男性不育的关系有待研究揭示。     

Association between X-ray repair cross-complementing group 1 Arg399Gln polymorphism and male infertility: An update meta-analysis

Numerous studies concentrate on the association between X-ray repair cross-complementing group 1 (XRCC1) gene polymorphism and male infertility; however, the results remain inconclusive and inconsistent. Hence, this meta-analysis was conducted to get a precise estimation of the correlation. PubMed, Web of Science, Embase, Scopus and China National Knowledge Infrastructure (CNKI) databases were searched to identify the all relevant studies before 3 May 2020. Summary odds ratios (ORs) and 95% confidence intervals (95% CIs) were used to assess the strength of the association. Finally, six studies with 1,886 cases and 1,212 controls were included in our study. The result indicated that XRCC1 Arg399Gln polymorphism was significantly associated with male infertility under allelic model (A-allele vs. G-allele: OR = 1.183, p = .003), heterozygote genetic model (AA vs. GA: OR = 1.256, p = .027), recessive genetic model (AA vs. GG + GA: OR = 1.279, p = .012) and dominant genetic model (AA + GA vs. GG: OR = 1.218, p = .026). In addition, in Asian subgroup, statistic correlation remained significant in allelic model (A-allele vs. G-allele: OR = 1.145, p = .025) with rare heterogeneity (I² = 0%). In summary, our meta-analysis suggested that XRCC1 Arg399Gln polymorphism was significantly associated with male infertility and the A-allele might be a risk factor for this disease, especially in Asians.     

Glutathione S‐transferase Mu‐1 gene polymorphism in Egyptian patients with idiopathic male infertility

The aim of this study was to examine whether an association exists between glutathione S‐transferase Mu‐1 (GSTM1) gene polymorphism and idiopathic male infertility. Sixty men with primary idiopathic infertility and 60 fertile men, serving as controls, were recruited for the study. The polymorphism was analysed using polymerase chain reaction–restriction fragment length polymorphism (PCR‐RFLP) technique. The frequency of GSTM1 null genotype was observed to be higher in infertile men 40% in comparison with 33.3% in the fertile men, but this difference was not statistically significant. There was statistically significant difference between cases and controls as regards GSTM1 genotype distribution (^MCP = 0.006*) in GSTM1‐positive men. Patients with the GSTM1 null genotype had significantly lower sperm concentrations and total sperm count when compared with patients with GSTM1‐positive genotype. In the control group, men with GSTM1 null genotype had significantly lower sperm concentrations but not total sperm count when compared with men with GSTM1‐positive genotype. The results of this study suggest a possible negative effect of GSTM1 null genotype on the spermatogenic potential of the testis.     

Association of the methylenetetrahydrofolate reductase gene C677T polymorphism with the risk of male infertility: a meta-analysis

Several molecular epidemiological studies have been conducted to examine the association between methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism and male infertility susceptibility, but the results remain inconclusive. To derive a more precise estimation of the relationship, a meta-analysis was performed. In this meta-analysis, a total of 26 case–control studies including 5659 infertility cases and 5528 controls were selected to evaluate the possible association. The pooled odds ratios (ORs) with 95% confidence intervals (95% CIs) were used to assess the strength of association of C677T polymorphism with male infertility in the additive model, dominant model, recessive model and allele-frequency genetic model. In the overall analysis, the frequency of the 677T allele was significantly associated with male infertility susceptibility (OR?=?2.32, 95%CI?=?2.04–2.65 for TT vs. CC genotype; OR?=?1.09, 95%CI?=?1.00–1.19 for CT vs. CC genotype; OR?=?1.19, 95%CI?=?1.10–1.29 for CT/TT vs. CC genotype; OR?=?1.54, 95%CI?=?1.36–1.74 for TT vs. CC/TT genotype; OR?=?1.22, 95%CI?=?1.15–1.30 for T vs. C allele). A subgroup analysis of the subjects showed that significantly strong association between MTHFR C677T polymorphism and male infertility was present only in Asians, but not in Caucasians. Additionally, MTHFR C677T was associated with a significant increase in the risk of azoospermia in all genetic models. Meanwhile, no significantly increased risks of oligoasthenotertozoospermia (OAT) were found in most of the genetic models. In conclusion, this meta-analysis is in favor that the MTHFR C677T polymorphism is capable of causing male infertility susceptibility, especially in Asians and the subgroup of azoospermia.     

泛素特异蛋白酶26基因多态性与特发性男性不育症的相关性研究

目的:研究泛素特异蛋白酶26(Usp26)基因多态性与特发性男性不育的关系及其在精子发生过程中的作用机制。方法:按照WHO标准(第4版)从150例不育患者中筛选出41例特发性不育患者,同时选取50例正常生育男性作为对照。采用PCR-SSCP法,从特发性不育患者中筛选突变样本,通过基因测序以确定突变方式和位点。结果:筛选出的41例特发性男性不育患者主要表现为精子浓度低、活动率差。基因测序分析结果显示:41例不育患者中9例(22.0%,P=0.01)存在Usp26基因的改变。其中,从8例(19.5%,P=0.01)患者中检测出复合突变:364位插入ACA和460位A置换了G;从1例(2.4%,P>0.05)患者中检测出1 044位A置换了T。以上3种变化均导致编码氨基酸的改变。50例正常生育男性均未发现该基因的突变。结论:Usp26基因的多态性可能与特发性男性不育症密切相关,且影响睾丸功能。     

Association of seminal angiotensinogen with sperm motility and morphology in male infertility

Many researchers have shown that renin–angiotensin system (RAS) is involved in various important aspects of male reproduction. In this study, we assessed whether abnormal levels of seminal angiotensinogen (AGT) may be associated with semen parameters in infertile males. A total of 115 male patients were recruited, and semen parameters, seminal AGT and the electrolytes including K⁺, Na⁺, Cl^?, P and Ca were evaluated. According to the World Health Organization (WHO) 2010 criteria, the patients were divided into two groups: G1 group with normal semen parameters (n = 42) and G2 group with subnormal semen parameters (n = 73). The level of seminal AGT was significantly higher in G2 group compared with G1 group. Moreover, the level of AGT was negatively correlated with the percentage of total motility (r = ?.322, p = .000), progressive motility (PR) (r = ?.339, p = .000) and morphologically normal forms (r = ?.263, p = .004). This study suggests that elevated seminal AGT level is associated with increased risk of asthenospermia and teratozoospermia.     

Association of the c.‐9C>T and c.368A>G transitions in H2BFWT gene with male infertility in an Iranian population

The H2BFWT (H2B family, member W, testis specific) gene is a testis‐specific histone which is involved in the spermatogenesis process. This study aimed to investigate the association of H2BFWT gene c.‐9C>T and c.368A>G polymorphisms with male infertility in an Iranian population. The 232 independent individuals, including 109 infertile men and 123 healthy controls, were recruited from IVF centre (Kashan, Iran). The allele types of c.‐9C>T and c.368A>G polymorphisms were detected by using PCR‐RFLP method. In overall analysis, we found that the c.‐9T (OR: 1.75, 95% CI: 1.04–2.95, p = .035) and c.368G (OR: 1.71, 95% CI: 1.02–2.89, p = .042) alleles are associated with male infertility. The c.‐9T allele was also associated with nonobstructive azoospermia (OR: 2.08, 95% CI: 1.01–4.25, p = .046), while c.368G allele was associated with oligozoospermia (OR: 2.10, 95% CI: 1.15–3.85, p = .016). It is concluded that H2BFWT gene c.‐9C>T and c.368A>G polymorphisms might be genetic risk factors for idiopathic male infertility.     

Association of polymorphisms in glutathione S-transferase genes (GSTM1, GSTT1, GSTP1) with idiopathic azoospermia or oligospermia in Sichuan,China

The reported effects of the glutathione S-transferase (GSTs) genes (GSTM1, GSTT1, and GSTP1) on male factor infertility have been inconsistent and even contradictory. Here, we conducted a case-control study to investigate the association between functionally important polymorphisms in GST genes and idiopathic male infertility. The study group consisted of 361 men with idiopathic azoospermia, 118 men with idiopathic oligospermia, and 234 age-matched healthy fertile male controls. Genomic DNA was extracted from the peripheral blood, and analyzed by polymerase chain reaction and restriction fragment length polymorphism analysis. There was a significant association between the GSTP1 variant genotype (Ile/Val + Val/Val) with idiopathic infertility risk (odds ratio [OR]: 1.53; 95% confidence interval [CI]: 1.11–2.11; P = 0.009). Similarly, a higher risk of infertility was noted in individuals carrying a genotype combination of GSTT1-null and GSTP1 (Ile/Val + Val/Val) (OR: 2.17; 95% CI: 1.43–3.31; P = 0.0002). These results suggest an increased risk of the GSTP1 variant genotype (Ile/Val + Val/Val) for developing male factor infertility. Our findings also underrate the significance of the effect of GSTM1 and/or GSTT1 (especially the former) in modulating the risk of male infertility in males from Sichuan, southwest China.