title: Research resources: comparative microRNA profiles in human corona radiata cells and cumulus oophorus cells detected by next-generation small RNA sequencing.
abstract: During folliculogenesis, cumulus cells surrounding the oocyte differentiate into corona radiata cells (CRCs) and cumulus oophorus cells (COCs), which are involved in gonadal steroidogenesis and the development of germ cells. Several studies suggested that microRNAs (miRNAs) play an important regulatory role at the post-transcriptional level in cumulus cells. However, comparative miRNA profiles and associated processes in human CRCs and COCs have not been reported before. In this study, miRNA profiles were obtained from CRCs and COCs using next generation sequencing in women undergoing controlled ovarian stimulation for IVF. A total of 785 and 799 annotated miRNAs were identified in CRCs and COCs, while high expression levels of six novel miRNAs were detected both in CRCs and in COCs. In addition, different expression patterns in CRCs and COCs were detected in 72 annotated miRNAs. To confirm the miRNA profile in COCs and CRCs, quantitative real-time PCR was used to validate the expression of annotated miRNAs, differentially expressed miRNAs, and novel miRNAs. The miRNAs in the let-7 family were found to be involved in the regulation of a broad range of biological processes in both cumulus cell populations, which was accompanied by a large amount of miRNA editing. Bioinformatics analysis showed that amino acid and energy metabolism were targeted significantly by miRNAs that were differentially expressed between CRCs and COCs. Our work extends the current knowledge of the regulatory role of miRNAs and their targeted pathways in folliculogenesis, and provides novel candidates for molecular biomarkers in the research of female infertility.
authors.affiliation: Institute of Immunology, Medical College of Shandong University, Ji'nan, China; Center for Reproductive Medicine, Anhui Provincial Hospital Affiliated with Anhui Medical University, Hefei, China.
authors.forename: Xian-Hong
authors.initials: XH
authors.lastname: Tong
authors.affiliation: Center for Reproductive Medicine, Anhui Provincial Hospital Affiliated with Anhui Medical University, Hefei, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Xu
authors.affiliation: Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, China.
authors.forename: Yuan-Wei
authors.initials: YW
authors.lastname: Zhang
authors.affiliation: Center for Reproductive Medicine, Anhui Provincial Hospital Affiliated with Anhui Medical University, Hefei, China.
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Liu
authors.affiliation: Institute of Immunology, Medical College of Shandong University, Ji'nan, China.
authors.forename: Chun-Hong
authors.initials: CH
authors.lastname: Ma
mesh_terms: D000328:Adult; D002454:Cell Differentiation; D054885:Cumulus Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D005260:Female; D005307:Fertilization in Vitro; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives / Q000494:pharmacology; D006801:Humans; D053858:Metabolic Networks and Pathways / Q000235:genetics; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*; D010062:Ovulation Induction
chemical_list: D035683:MicroRNAs; D007987:Gonadotropin-Releasing Hormone; C083781:LHRH, Ala(6)-Gly(10)-ethylamide-