线粒体DNA拷贝数对卵母细胞受精结局的影响  

Mitochondrial DNA copy number effects fertilization outcome of oocytes

作　　者：戴蜜蜜[1] 胡珍[2] 吕杰强[1] 葛红山[1] 

机构地区：[1]温州医学院附属第二医院妇产科生殖医学中心,温州325000 [2]温州医学院环境与公共卫生学院,温州325000

出　　处：《生殖医学杂志》2012年第2期158-161,共4页Journal of Reproductive Medicine

基　　金：国家自然科学基金(30900516);浙江省自然科学基金(Y208100)

摘　　要：目的研究线粒体DNA拷贝数对卵母细胞受精结局的影响,为提高卵子质量,改善体外受精结局提供新思路。方法应用实时荧光定量聚合酶链反应技术检测不同受精结局的卵母细胞线粒体DNA(mtDNA)拷贝数,并对各组结果作比较分析。结果 A组52枚未受精卵的平均mtDNA拷贝数为(80,547±37,314)copies/μl,B组46枚发生原核阻滞的正常受精合子平均mtDNA拷贝数为(104,311±43,074)copies/μl,C组61枚单原核(1PN)或三原核(3PN)胚胎平均mtDNA拷贝数为(192,681±51,394)copies/μl。拷贝数A组显著小于B、C两组(P<0.01),B组显著小于C组(P<0.05)。C组中碎片率>30%的较差胚胎(C1组)和碎片率<5%、发育速度正常的良好胚胎(C2组)两个亚组,两组的平均mtDNA拷贝数分别为(146,836±36,585)copies/μl和(297,268±102,369)copies/μl,两组比较结果有显著性差异(P=0.000)。结论线粒体DNA拷贝数可作为衡量卵母细胞和胚胎质量的重要指标,线粒体缺乏可能是部分体外受精失败的原因。Objective： To determine the effect of mitochondrial DNA （mtDNA） copy number on fertilization outcome of oocytes in order to provide new idea for improving fertilizing rate. Methods：The mtDNA copy number in fertilized and unfertilized oocytes and embryos were analyzed by real-time polymerase chain reaction （PCR）. Results：There were 52 unfertilized oocytes in group A, 46 fertilized oocytes with pronucleus blocking in group B and 61 mono-pronucleus（1PN）or tri-pronucleus（3PN）embryoes in group C. The mtDNA copy number in group A （80, 547 ± 37, 314 copies/μl） was significantly fewer than that in group B （104,311±43,074） copies/μl and group C （192,681±51,394） copies/μl （P〈0.01）. The mtDNA copy number in group B was significantly fewer than that in group C（P〈0.05）. Group C was divided to two subgroup： group C1 （poor quality of embryos and debris more than 5%） and group C2 （normal development of embryos）. The mtDNA copy number in group C1 [（146,836±36,585） copies/μl] was significantly fewer than that in group C2E（297,268±102,369） copies/tμl]（P=0. 000）. Conclusions： Mitochondrial DNA copy number is critical for fertilization outcome and can be as an important marker of oocyte quality. It may explain some cases of fertilization failure.

关 键 词：线粒体 线粒体DNA 卵母细胞 受精 早期胚胎发育 

分 类 号：R6[医药卫生—外科学]