瘦素受体基因Lys109Arg多态性与慢性肝病的关系

目的探讨瘦素受体基因Lys109Arg多态性与慢性肝病及血清瘦素水平的关系。方法采用聚合酶链反应及限制性片段长度多态性方法(PCR-RFLP)测定150例慢性肝病患者和89例对照组的瘦素受体Lys109Arg多态性的基因型,同时检测两组血清瘦素水平。结果慢性肝病组与对照组的瘦素受体Lys109Arg基因型频率及等位基因频率比较差异无显著性(P>0.05);慢性肝病患者中慢性肝炎、肝硬化间基因型频率及等位基因频率比较差异无显著性(P>0.05);慢性肝病患者中Arg109Arg基因型携带者的空腹血清瘦素水平较Lys109Arg基因型低(P<0.05)。结论瘦素受体Lys109Arg基因多态性与慢性肝病患者的空腹血清瘦素水平有关。     

瘦素受体基因多态性与原发性高血压患者动脉粥样硬化的相关性

目的:探讨两种瘦素受体(LEPR)基因多态性Gln223Arg(rs1137101)和Lys109Arg(rs1137100)与动脉粥样硬化的相关性。方法:选取原发性高血压(EH)住院患者302例(EH组)和门诊体检健康者120例(对照组),用统计学方法分析两种多态基因型、内膜-中膜厚度(IMT)与动脉粥样硬化危险因素的相关性。结果:EH组双侧颈总动脉(CCA)、颈动脉分叉处(BIF)及平均颈动脉(CBI)IMT值均高于对照组(均P<0.05);Gln223ArgAA基因型携带者有更高的颈内动脉(ICA)及CBI(均P<0.05);Lys109Arg GG基因型携带者有更低的BIF及CBI(均P<0.05)。结论:LEPR基因多态性与动脉粥样硬化发生发展密切相关。     

瘦素受体基因多态性与云南地区高血压合并肥胖的相关性

目的 探讨瘦素受体(LEPR)基因多态性与云南地区汉族人口高血压合并肥胖的相关性.方法 选取云南地区汉族高血压病住院患者283例,同期选取正常对照组153例.将高血压组以体质指数(BMI)≥28 kg/m2划分为肥胖高血压组162例和单纯高血压组121例两个亚组.运用聚合酶连反应限制性片段长度多态性(PCRRELP)方法测定LEPR基因Gln223Arg和Lys109Arg多态性.采用彩色超声诊断仪测定颈动脉内膜中膜厚度(CIMT).结果 LEPR基因Gln223Arg基因型频率和等位基因频率在高血压组和对照组之间分布有统计学意义(P＜0.01); LEPR基因Lys109Arg基因型频率和等位基因频率在高血压组和对照组之间分布无统计学意义(P＞0.05).LEPR基因Gln223Arg等位基因A的频率在肥胖高血压明显高于单纯高血压组(P＜0.01),并且有着更厚颈动脉内膜中膜厚度(P＜0.05).Lys109Arg基因型频率在肥胖高血压组临床资料比较中差异无统计学意义.结论 LEPR基因Gln223Arg与高血压合并肥胖明显相关;且A等位基因是高血压合并肥胖人群发生动脉粥样硬化的危险因素;Lys109Arg多态性与高血压及各项临床特征比较无明显相关.     

瘦素受体基因多态性与云南地区人口高血压及代谢特征的相关性研究

目的:探讨瘦素受体(Lepr)基因多态性与云南地区汉族人高血压及其临床代谢特征的相关性。方法:选取云南地区汉族高血压病住院患者200例,以体重指数分为超重高血压组141例和单纯高血压组59例两个亚组,同期选取正常对照组100例。采用聚合酶连反应-限制性片段长度多态性(PCR-RELP)方法测定Lepr基因Gln223Arg和Lys109Arg多态性,ELISA法测定血中瘦素水平。结果:Gln223Arg位点A等位基因的频率在超重高血压明显高于单纯高血压组,并且有着更高的BMI(P<0.01)。超重高血压患者中携带Lys109Arg基因型A等位基因者低密度脂蛋白胆固醇(LDL-C)高于G等位基因者(P<0.01)。结论:Gln223Arg多态性与肥胖密切相关,Lys109Arg多态性与超重高血压患者脂代谢紊乱相关。     

老年非酒精性脂肪性肝病痰湿质患者与瘦素受体和脂联素基因多态性的关联研究

目的:研究老年非酒精性脂肪性肝病(NAFLD)痰湿质患者的易感基因。方法:461例NAFLD患者纳入此研究,采用Sequenom平台的MassARRAY分子量阵列技术对LEPR rs1805094、 rs11208659、 rs4655537、 rs12409877和ADIPOQ rs182052、 rs3774261、 rs6773957、 rs17366568进行基因多态性分型。结果:脂联素(ADIPOQ)和瘦素受体(LEPR)与NAFLD患者痰湿质相关。痰湿质患者中ADIPOQ rs182052 G基因携带者明显高于A基因携带者;LEPR rs11208659 T基因携带者人数明显高于C基因携带者。进一步在遗传模型分析中发现,ADIPOQ rs182052 A基因是痰湿质患者的保护基因;LEPR rs11208659 T基因是痰湿质患者的危险因素。多因素逻辑回归分析发现以ADIPOQ rs182052野生型AA基因型为参照时,突变型GG基因型携带者痰湿质患者的发病风险为AA基因型携带者的2倍。结论:ADIPOQ是NAFLD痰湿质患者的保护基因,ADIPOQ rs182052位点基因多态性可能是NAFLD痰湿质的分子遗传学基础之一。     

瘦素受体基因Gln223Arg多态性与阻塞性睡眠呼吸暂停低通气综合征的关系

目的　探讨瘦素受体 (Lepr)基因Gln2 2 3Arg多态性与阻塞性睡眠呼吸暂停低通气综合征 (OSAHS)之间的关系。方法　采用聚合酶链反应 限制性片段长度多态性 (PCR RFLP)方法 ,测定181例中国北方地区汉族人Gln2 2 3Arg多态性的基因型 (其中OSAHS组 10 3例 ,非OSAHS对照组 78例 ) ,同时测定体重指数 (BMI)、颈围 (NC)、腰臀比 (WHR)以及醒后血压 (Bp)、醒后心率 (HR)、多导睡眠图 (PSG)。其中OSAHS组 6 0例 ,非OSAHS对照组 4 0例进行了血清空腹血糖 (FBG)、甘油三酯 (TG)、胆固醇 (Chol)、空腹真胰岛素 (TI)及血清瘦素 (Lep)的测定。结果　携带瘦素受体GG基因型的OSAHS患者颈围明显较 (GA +AA)基因型颈围大 [(41 4 6± 0 34)cmvs (39 85± 0 70 )cm ,P =0 0 31];Gln2 2 3Arg多态性与北方地区汉族人OSAHS无显著相关性 (χ2 =0 783,P =0 6 76 ) ;Gln2 2 3Arg不同基因型与OSAHS的总体脂、Bp、Lep、TI、FBG、TG、Chol及PSG各参数间不存在相关性 (P >0 0 5 )。结论　Lepr基因Gln2 2 3Arg多态性可能参与了OSAHS颈部脂肪选择性分布的调节 ,但其在北方地区汉族OSAHS的发病中可能无重要作用 ;目前的研究未发现Gln2 2 3Arg的基因型与OSAHS的BMI、高血压、FBG、TI、Lep、TG、Chol水平以及PSG参数之间存在相关性。     

北京地区汉族妇女瘦素受体基因Gln223Arg多态性和骨密度的关系

目的　探讨瘦素受体基因Gln2 2 3Arg多态性与青年妇女骨峰值和绝经后骨质疏松妇女骨密度的关系。方法　筛选 2 19例健康青年妇女和 10 2例绝经后骨质疏松妇女 ,用双能X线吸收测定法检测研究对象腰椎和髋部的骨密度 ,用PCR 限制性片段长度多态性分析方法检测研究对象的瘦素受体基因Gln2 2 3Arg的基因型。 结果　本研究人群中瘦素受体基因Gln2 2 3Arg基因型及基因频率的分布符合Hardy Weinberg定律 ,提示本研究人群是一个平衡群体。青年妇女组瘦素受体基因Gln2 2 3Arg的GG基因型组腰椎 2～ 4的骨密度高于GA和AA基因型组 [(1.2 13± 0 .12 7) g/cm2 比(1.15 4± 0 .12 4 ) g/cm2 ,P <0 .0 5 ],在股骨颈、Ward三角区、大转子部位各基因型组间骨密度值无统计学差异 ;10 2例绝经后骨质疏松妇女中LEPR基因Gln2 2 3Arg各基因型组间在腰椎 2～ 4、股骨颈、Ward三角区、大转子部位的骨密度值均无统计学差异。偏相关分析进一步表明青年妇女组的瘦素受体基因多态性与腰椎 2～ 4的骨密度相关 (r =- 0 .15 1,P <0 .0 5 )。结论　瘦素受体基因Gln2 2 3Arg的多态性与青年妇女腰椎 2～ 4骨峰值的获得和维持有关 ,可能是骨峰值独立的影响因素 ,等位基因G可能是骨量的保护因子 ,可作为预测汉族妇女骨质疏松发生危险性的遗传     

脂蛋白脂酶基因Ser447Ter变异对血脂的影响

目的　探讨脂蛋白脂酶 (LPL)基因Ser447Ter变异是否影响血脂水平。方法　 2 52例受试者 ,其中 1 32例冠心病患者及 1 2 0例非冠心病者。采用聚合酶链式反应 限制性片段多态性方法检测LPL基因多态性。结果　LPL基因Ser447Ter突变杂合子 (CG型携带者 )和纯合子 (GG型携带者 )血甘油三酯浓度 [(1 1 7± 0 55)mmol L]低于无Ser447Ter突变者 [CC型携带者 ,(1 64± 1 1 1 )mmol L] ,P<0 0 1 ;前者高密度脂蛋白 胆固醇水平 [(1 2 4± 0 2 7)mmol L]高于后者 [(1 1 3± 0 2 7)mmol L] ,P <0 0 5 ;这种效应女性携带者更为明显。但是 ,男女两性Ser447Ter各基因型的比例相近。结论　LPLSer447Ter突变可影响血脂水平 ,且存在男女性别差异 ,各LPL基因型的分布无性别差异     

瘦素受体基因多态性与心血管及相关疾病的研究

疫素参与肥胖和相关疾病如冠心病、高血压、代谢综合征,随着研究的深入,人们发现了疫素受体基因多态性及其变异,由于瘦素通过瘦素受体发挥作用,因而,瘦素受体基因多态性成为了近年的研究趋势与热点.研究较多的为Lys109Arg,Gln223Arg,Lys656Asn这3种.瘦素受体基因多态性在人类可引起病态肥胖,其与高血压、糖...     

瘦素受体基因Gln223Arg多态性与原发性高血压相关性研究

目的:研究高血压候选基因瘦素受体基因(LEPR)在中国北方汉族人群的分布,探讨LEPR基因Gln223Arg多态性与原发性高血压(EH)的关系。方法:采集健康体检人群临床资料,分析体质量指数、血脂、血糖等临床指标,同时调查受检者吸烟和饮酒等生活习惯;Taq Man-MGB法分析LEPR基因Gln223Arg多态性在中国北方汉族人群(样本总数1 273例,其中原发性高血压病患者774例,血压正常的健康体检者499例)的分布及其与临床指标的相关性。结果:LEPR基因Gln223Arg基因型在两组总体的差异具有统计学意义(P=0.036)。按照血尿酸水平进行亚组分析,高尿酸亚组基因型(P=0.039)和等位基因频率(P=0.037)的差异具有统计学意义;调整相关因素的影响后,多因素Logistic回归模型分析显示:LEPR基因Gln223Arg多态性与EH相关[(GG+AG)vs.AA模型,OR=3.23,95%CI:1.01~10.34,P=0.008;GG vs.AA模型,OR=3.43,95%CI:1.35~8.75,P=0.010];高尿酸亚组也显示该多态性与EH发病密切相关[G vs.A模型,OR=1.89,95%CI:1.09~3.28,P=0.023;(GG+AG)vs.AA模型,OR=7.76,95%CI:1.18~49.80,P=0.033;GG vs.AA模型,OR=8.50,95%CI:1.29~56.12,P=0.026;GG vs.AG vs.AA模型,OR=1.94,95%CI:1.10~3.43,P=0.023]。结论:在中国北方汉族人群中,LEPR基因Gln223Arg多态性与原发性高血压相关。     

Hypertension in obesity and the leptin receptor gene locus

Recent animal studies indicate that leptin is involved in the regulation of blood pressure through the leptin receptor. Therefore, 51-yr-old men (N = 284) were selected; and anthropometric, endocrine, metabolic, and hemodynamic variables were examined in relation to polymorphisms of the leptin receptor gene (LEPR), by restriction fragment length polymorphism technique. Three polymorphisms were examined: Lys109Arg in exon 4, Gln223Arg in exon 6, and Lys656Asn in exon 14. In comparison with Lys109 homozygotes, Arg109 homozygotes (9%) showed lower body mass index (BMI) and abdominal sagittal diameter, as well as lower systolic (10.0 mm Hg) and diastolic (7.8 mm Hg) blood pressure. Additionally, Arg223 homozygotes (26.8%) showed lower blood pressure (7.6/5.7 mm Hg) than Gln223 homozygotes. These lower blood pressure levels were independent of other variables. No differences were found with the Lys656Asn polymorphism. Measurements of body fat mass correlated with leptin concentration in Lys109 homozygotes and in Lys109 heterozygotes but not in Arg109 homozygotes. Blood pressure correlated with leptin only in men carrying the wild-type allele Lys109. With both elevated BMI and leptin, Lys109 homozygotes had higher blood pressure than the Arg109 homozygous men (12.4/6.9 mm Hg). Men with blood pressure > or = 140/90 mm Hg had, in comparison with normotensive men, increased BMI and leptin levels, and Lys109 homozygotes were significantly more prevalent. These results suggest that leptin is associated with blood pressure regulation in men through the leptin receptor. When BMI and leptin are elevated, increased blood pressure is found only with the most prevalent LEPR genotype at codons 109 and 223, whereas variants of this receptor seem to protect from hypertension. This might explain why not all obese men are hypertensive.     

瘦素受体基因Gln223Arg多态性与非酒精性脂肪性肝病的关系

目的 探讨瘦素受体基因多态性与非酒精性脂肪肝患者临床表型间的关系.方法 以非酒精性脂肪肝患者和正常对照人群为研究对象,应用聚合酶链反应及限制性片段长度多态性方法(PCR-RFLP),对167例中国人(包括85例非酒精性脂肪肝患者和82例正常对照)的瘦素受体基因Gln223Arg进行研究,同时进行临床参数的检测.结果 (1)非酒精性脂肪肝患者和正常对照组人群中Gln223Arg基因型频率和等位基因频率差异无显著性(P>0.05).(2)非酒精性脂肪肝男性患者中AA AG基因型者TC、BMI高于GG基因型(P<0.05).(3)进一步用Logistic回归分析发现:在非酒精性脂肪肝男性患者中该基因变异与TC相关(P=0.019).结论 非酒精性脂肪肝男性患者瘦素受体基因Gln223Arg多态性与TC水平相关.瘦素受体基因Gln223Arg可能参与非酒精性脂肪肝的脂质代谢.     

Effect of polymorphisms in the PPARGC1A gene on body fat in Asian Indians

OBJECTIVE: To evaluate whether polymorphisms in the peroxisome proliferator-activated receptor-gamma coactivator-1 alpha (PPARGC1A) gene were related to body fat in Asian Indians. METHODS: Three polymorphisms of PPARGC1A gene, the Thr394Thr, Gly482Ser and +A2962G, were genotyped on 82 type 2 diabetic and 82 normal glucose tolerant (NGT) subjects randomly chosen from the Chennai Urban Rural Epidemiology Study using PCR-RFLP, and the nature of the variants were confirmed using direct sequencing. Linkage disequilibrium (LD) was estimated from the estimates of haplotypic frequencies using an expectation-maximization algorithm. Visceral, subcutaneous and total abdominal fat were measured using computed tomography, whereas dual X-ray absorptiometry was used to measure central abdominal and total body fat. RESULTS: None of the three polymorphisms studied were in LD. The genotype (0.59 vs 0.32, P=0.001) and allele (0.30 vs 0.17, P=0.007) frequencies of Thr394Thr polymorphism were significantly higher in type 2 diabetic subjects compared to those in NGT subjects. The odds ratio for diabetes (adjusted for age, sex and body mass index) for the susceptible genotype, XA (GA+AA) of Thr394Thr polymorphism, was 2.53 (95% confidence intervals: 1.30-5.04, P=0.009). Visceral and subcutaneous fat were significantly higher in NGT subjects with XA genotype of the Thr394Thr polymorphism compared to those with GG genotype (visceral fat: XA 148.2+/-46.9 vs GG 106.5+/-51.9 cm(2), P=0.001; subcutaneous fat: XA 271.8+/-167.1 vs GG 181.5+/-78.5 cm(2), P=0.001). Abdominal (XA 4521.9+/-1749.6 vs GG 3445.2+/-1443.4 g, P=0.004), central abdominal (XA 1689.0+/-524.0 vs GG 1228.5+/-438.7 g, P<0.0001) and non-abdominal fat (XA 18763.8+/-8789.4 vs GG 13160.4+/-4255.3 g, P<0.0001) were also significantly higher in the NGT subjects with XA genotype compared to those with GG genotype. The Gly482Ser and +A2962G polymorphisms were not associated with any of the body fat measures. CONCLUSION: Among Asian Indians, the Thr394Thr (G --> A) polymorphism is associated with increased total, visceral and subcutaneous body fat.     

Association of resistin gene 3'-untranslated region +62G-->A polymorphism with type 2 diabetes and hypertension in a Chinese population

Resistin, a recently discovered polypeptide, antagonizes insulin action and may play a part in the pathogenesis of insulin resistance. This study investigates whether resistin gene polymorphism can be associated with type 2 diabetes. We studied 1102 Chinese type 2 diabetes patients and 743 subjects without diabetes. The resistin 3'-untranslated region (UTR) +62G-->A polymorphism was determined by PCR. Type 2 diabetes subjects had a lower frequency of resistin gene 3'UTR +62A allele (GG:GA/AA, 83.5%:16.5%) than the controls (GG:GA/AA, 75.1%:24.9%; odds ratio, 1.524; 95% confidence interval, 1.268-1.831; P < 0.001). Unexpectedly, diabetic patients with the GG genotype had a higher prevalence of hypertension (GG:GA/AA, 49.8%:36.2%; odds ratio, 1.375; 95% confidence interval, 1.116-1.693; P = 0.001). Logistic regression analysis confirmed that the resistin gene 3'UTR +62G-->A polymorphism acts as an independent contributing factor to type 2 diabetes and hypertension. The mean systolic and diastolic blood pressure levels in diabetic subjects with the GG genotype (144 +/- 21/87 +/- 13 mm Hg) were significantly higher than those in subjects with GA/AA variants (139 +/- 21/84 +/- 14 mm Hg; P = 0.004 and P = 0.002, respectively). Multiple linear regression analysis showed resistin gene polymorphism to be an independent factor associated with systolic and diastolic blood pressures in type 2 diabetes patients. These findings suggest that resistin may play a role in the pathogenesis of type 2 diabetes and insulin resistance-related hypertension.     

慢性阻塞性肺疾病伴营养不良患者瘦素受体基因Gln223Arg多态性研究

目的探讨瘦素受体基因Gln223Arg多态性与慢性阻塞性肺疾病伴营养不良的关系。方法观察158例COPD临床稳定期老年患者及108例健康对照者,并根据体重指数（BMI）、理想体重百分比（NW％）、三头肌皮皱厚度（TSF）、上臂中点臂围（MAC）、血清白蛋白（ALB）、总淋巴细胞（LYM）等营养参数,将COPD组分为营养不良组（COPD1组）66例,COPD非营养不良组（COPD2组）92例。用酶联免疫吸附试验（ELISA）法测定血清瘦素水平,采用聚合酶链式反应及连接酶检测反应方法（PCR—LDR）测定158例COPD患者与108例对照组的瘦素受体基因Gln223Arg多态性的基因型。结果COPD营养不良组Gln223Arg基因型GG、GA及AA的频率分别为0．924、0．061和0．015,G和A等位基因频率分别为0．955和0．045;COPD非营养不良组Gln223Arg基因型GG、GA及AA的频率分别为0．783、0．206和0．011,G和A等位基因频率分别为0．886和0．114;对照组Gln223Arg基因型GG、GA及AA的频率分别为0．769、O．222和0．009,G和A等位基因频率分别0．88和0．12;COPD1组Gln223Arg基因型及等位基因频率与COPD2组和对照组比较差异有显著性;COPD2组和对照组比较差异无显著性。不同基因表型血清瘦素水平GG型低于A／G型＋AA型（40．08±17．53ng／mLVS44．35±16．95ng／mL）,但差异无统计学意义。结论瘦素受体基因Gln223Arg多态性可能与COPD营养不良有关。     

瘦素受体基因多态性与高血压病及其临床代谢特征的相关性研究

目的探讨瘦素受体（LepR）基因多态性与高血压患者及临床代谢特征的相关性。方法选取来自上海、南京地区汉族高血压患者239例,根据体重指数（BMI）是否≥24kg／m。分为超重高血压组154例和单纯高血压组85例,正常人（对照组）141例。运用聚合酶链反应-限制性片段长度多态性（PCR—RFLP）方法测定LepR摹因位点Gln223Arg和Lys109Arg的突变情况。结果位点Gln223Arg、Lys109Arg各基因型频率在高血压组和对照组分布未见明显差异,位点Gln223Arg等位基因G的频率存超重高血压高于单纯高血压组。高血压组临床代谢特征比较,Lys109Arg含A等位基因者（基因型AA＋AG）低密度脂蛋白胆固醇、空腹血糖、餐后血糖高于不含A等位基因者（基因型GG）。结论位点Gln223Arg和Lysl09Arg的变异与高血压无明显相关,但位点Gln223Arg的变异与肥胖相关,Lysl09Arg位点的变异与高血压患者糖代谢、脂代谢异常相关。     

Genetic variation in leptin receptor gene is associated with type 2 diabetes and body weight: The Finnish Diabetes Prevention Study

OBJECTIVE: Genetic variation in leptin receptor (LEPR) gene has been reported to associate with insulin and glucose metabolism and adiposity in different study settings and various populations. We wanted to evaluate the association between LEPR polymorphisms, diabetes risk and body weight in Finnish subjects with impaired glucose tolerance (IGT). METHODS: We investigated the associations of the three LEPR polymorphisms (Lys109Arg, Gln223Arg, 3'UTR Del/Ins) with the conversion to type 2 diabetes and the changes in body weight in 507 individuals with IGT participating in the Finnish Diabetes Prevention Study. Participants were randomized to either an intensive diet and exercise intervention group or a control group. RESULTS: After 3 years, the odds ratio for the development of type 2 diabetes in individuals in the control group with the Lys109Lys genotype was 2.38-fold higher than in individuals with other genotype combinations (P=0.016). Irrespective of group individuals with the Gln223Gln genotype had higher conversion to type 2 diabetes (OR 2.01 (95% CI 1.03-3.93)) than the Arg223 allele carriers (P=0.042). The risk was more pronounced in the control group than in the intervention group. Individuals having the 3'UTR Del/Del genotype had a slightly higher body weight throughout the study than those with the insertion allele (P=0.020), although no difference in weight change was observed. CONCLUSION: Two polymorphisms (Lys109Arg, Gln223Arg) in the extracellular domain of the leptin receptor predicted the conversion to type 2 diabetes in high-risk individuals with IGT. The Del/Ins polymorphism in the 3'UTR of LEPR was associated with body weight.     

Leptin and leptin receptor gene polymorphisms in obstructive sleep apnea syndrome

BACKGROUND: Obstructive sleep apnea is common in obese people. Leptin is an adipocyte-derived signaling factor that has an important role in metabolic control. There is growing evidence that leptin regulation is altered in obstructive sleep apnea syndrome (OSAS). The aim of this study was to investigate the relation between polymorphisms of the leptin and leptin receptor (LEPR) genes and OSAS. METHODS: The study population consisted of 130 patients with OSAS and 50 healthy control subjects. All the subjects were Japanese. Diagnostic polysomnography was performed in all patients and control subjects. A highly polymorphic tetranucleotide repeat polymorphism in the 3'-flanking region of the leptin gene and three single nucleotide polymorphisms (SNPs) [Lys109Arg (A/G) in exon 4, Gln223Arg (A/G) in exon 6, and Lys656Asn (G/C) in exon 14] in the LEPR gene were examined. RESULTS: There were no significant differences in allelic frequencies and genotype distributions of the examined polymorphisms of the leptin and LEPR genes between OSAS patients and control subjects. For the LEPR gene, the wild-type alleles of the Gln223Arg and Lys656Asn SNPs had a marginally significant effect on mild OSAS, which was defined as an apnea-hypopnea index from 10 and 20 events/h in the dominant model. CONCLUSIONS: The tetranucleotide repeat polymorphism of the leptin gene and the Lys109Arg, Gln223Arg, and Lys656Asn SNPs in the LEPR gene were not associated with OSAS in the Japanese population. Further studies are required to confirm the association of the wild types of Gln223Arg and Lys656Asn SNPs with the severity of OSAS.