Participation of EML6 in the regulation of oocyte meiotic progression in mice  

作　　者：Hong Yin Xuan Hou Teng Zhang Lanying Shi You-Qiang Su 

机构地区：[1]State Key Laboratory of Reproductive Medicine,Nanjing Medical University,Nanjing,Jiangsu 211166,China [2]Collaborative Innovation Center of Genetics and Development,Fudan University,Shanghai 200433,China [3]Key Laboratory of Model Animal Research,Nanjing Medical University,Nanjing,Jiangsu 211166,China.

出　　处：《The Journal of Biomedical Research》2020年第1期44-53,共10页生物医学研究杂志（英文版）

基　　金：supported by National Key Research and Development Program(Grant No.2018YFC1003803)of China;National Natural Science Foundation of China(Grant No.31871507)to You-Qiang Su。

摘　　要：The generation of a high-quality egg for reproduction requires faithful segregation of chromosome during oocyte meiosis. Here, we report that echinoderm microtubule-associated protein like 6(EML6) is highly expressed in oocytes, and responsible for accurate segregation of homologous chromosomes in mice. Quantitative real-time RT-PCR and immunohistochemistry analyses revealed that EML6 was predominantly expressed by oocytes in the ovaries. Whole mount immunofluorescent staining showed that EML6 was colocalized with spindle microtubules in oocytes at various stages after meiotic resumption. This specialized localization was disrupted by nocodazole, the microtubule destabilizer, while enhanced by Taxol, a microtubule stabilizing reagent. In vivo knockdown of Eml6 expression by the specific si RNA resulted in chromosome misalignment and alteration in spindle dimension at both metaphase Ⅰ and Ⅱ stages, as well as the increased aneuploidy in the mature oocytes.Thus, these data suggest that EML family proteins participate in the control of oocyte meiotic division.The generation of a high-quality egg for reproduction requires faithful segregation of chromosome during oocyte meiosis. Here, we report that echinoderm microtubule-associated protein like 6(EML6) is highly expressed in oocytes, and responsible for accurate segregation of homologous chromosomes in mice. Quantitative real-time RT-PCR and immunohistochemistry analyses revealed that EML6 was predominantly expressed by oocytes in the ovaries. Whole mount immunofluorescent staining showed that EML6 was colocalized with spindle microtubules in oocytes at various stages after meiotic resumption. This specialized localization was disrupted by nocodazole, the microtubule destabilizer, while enhanced by Taxol, a microtubule stabilizing reagent. In vivo knockdown of Eml6 expression by the specific si RNA resulted in chromosome misalignment and alteration in spindle dimension at both metaphase Ⅰ and Ⅱ stages, as well as the increased aneuploidy in the mature oocytes.Thus, these data suggest that EML family proteins participate in the control of oocyte meiotic division.

关 键 词：ECHINODERM microtubule-associated protein like 6(EML6) MEIOSIS spindle chromosome alignment OOCYTE ANEUPLOIDY female FERTILITY 

分 类 号：Q492[生物学—生理学]