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Gene Expression Profiling of Human Oocytes Developed and Matured in Vivo Or in Vitro

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Gene Expression Profiling of Human Oocytes Developed and Matured in Vivo Or in Vitro Hindawi Publishing Corporation BioMed Research International Volume 2013, Article ID 879489, 20 pages http://dx.doi.org/10.1155/2013/879489 Review Article Gene Expression Profiling of Human Oocytes Developed and Matured In Vivo or In Vitro Irma Virant-Klun,1 Katja Knez,1 Tomaz Tomazevic,1 and Thomas Skutella2 1 Reproductive Unit, Department of Obstetrics and Gynecology, University Medical Centre Ljubljana, Slajmerjeva 3, 1000 Ljubljana, Slovenia 2 Institute for Anatomy and Cell Biology, Medical Faculty, University of Heidelberg, 69120 Heidelberg, Germany Correspondence should be addressed to Irma Virant-Klun; [email protected] Received 30 September 2012; Revised 7 December 2012; Accepted 8 December 2012 Academic Editor: Xuan Jin Copyright © 2013 Irma Virant-Klun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The quality of the human oocyte determines the success of fertilization and affects the consequent embryo development, pregnancy and birth; it therefore serves as a basis for human reproduction and fertility. The possibility to evaluate oocyte quality in the in vitro fertilization programme is very limited. The only criterion which is commonly used to evaluate oocyte quality is its morphology. There is a mass of oocytes in the in vitro fertilization programme which are not fertilized in spite of normal morphology. In the past, several attempts focused on oocyte gene expression profiling by different approaches. The results elucidated groups of genes related to the human oocyte. It was confirmed that some factors, such as oocyte in vitro maturation, are detectable at the molecular level of human oocytes and their polar bodies in terms of gene expression profile. Furthermore, the first genetic evaluations of oocyte-like cells developed in vitro from human stem cells of different origin were performed showing that these cells express some genes related to oocytes. All these findings provide some new knowledge and clearer insights into oocyte quality and oogenesis that might be introduced into clinical practice in the future. 1. Introduction oocyte quality markers. Additionally, recent studies also con- firmed that oocyte-like cells expressing some oocyte-specific A viable quality human oocyte is a prerequisite for successful genes can be developed in vitro from different types of stem fertilization, implantation, and development of a new human cells. These include human embryonic stem cells (hESCs) [3– being. Although an enormous development of techniques 7], human induced pluripotent stem cells (hiPSCs) [6, 7], of in vitro fertilization has arisen in recent years and sev- putative stem cells from adult human ovaries of women with eral indications of infertility became treatable, the general no naturally present follicles or oocytes [8–10], and human implantation and pregnancy rates after the embryo transfer amniotic fluid stem cells (hAFSCs)11 [ ]. Therefore it is also are still low [1]. A mass of embryos are developed in the in important to know the gene expression profile of these cells vitro fertilization programme which do not implant. This is to evaluate their quality and safety. The aim of this paper is to mainly due to a lack of reliable criteria on oocyte quality summarize the new knowledge on the gene expression profile and the selection of embryos with sufficient developmental of human oocytes developed and matured in vivo and in vitro. potential. The quality of oocytes obtained under ovarian stimulation for in vitro fertilization varies considerably and depends on several factors. A large proportion of oocytes 2. Human Oocyte are capable of being fertilized, but only approximately half of fertilized oocytes fully complete their preimplantation An oocyte is a female germ cell involved in reproduction. It development and still fewer implant [2]. More studies have is one of the largest cells in the body with a diameter of at evidenced that some gene expression levels could serve as least 100 m when mature. The oocyte is rich in cytoplasm 2 BioMed Research International that contains yolk granules to support the cell’s growth, suchastheregulationofthecellcycleprogressionandcellular maturation, and the early development after fertilization. In metabolism, fertilization, activation of zygotic transcription, vivo it is produced in the ovarian follicle, a functional unit embryo development, activation of the embryonic genome, of the ovary, during the process of oogenesis/folliculogenesis and formation of body axes. During oocyte growth a variety [12]. The oogenesis then starts with the development of of maternally transcribed mRNAs are supplied which rep- oogonia. Each oogonium inside the fetal ovaries divides and resent the maternal contribution to the oocyte and, conse- enters the initial stage of meiosis (meiosis I) to become the quently, the newly fertilized oocyte, zygote, and early embryo. primary oocyte.Thediploidprimary oocyte, however, does not These mRNAs can be stored in message ribonucleoprotein complete meiosis I but is stopped at the first meiotic prophase (mRNP) complexes and then translated when needed [13]; stage, called dictyate. At this stage the oocyte nucleus is called additionally, they can be localized within a specific region of the germinal vesicle (GV), as this stage refers to the GV stage the cytoplasm or dispersed within the cytoplasm of the entire of maturity. GV oocytes are localized within the primordial oocyte. Maternally synthesized proteins can also be localized follicle, also consisting of a flattened and condensed layer or ubiquitous throughout all the oocyte’s cytoplasm. of surrounding mesenchymal granulosa cells. By the end of the fetal period, all primary oocytes have formed and 3. Gene Expression Analyses of Human Oocytes arestoppedatthedictyatestage.Althoughmeiosiswas arrested, the dictyate chromosomes continue to synthesize The first gene expression analyses in human oocytes were per- large amounts of mRNA and rRNA, which are later used formed by reverse transcription-polymerase chain reaction to generate a bulk of essential proteins needed for oocyte (RT-PCR; see Table 1) and were followed using microarray maturation and further development of the fertilized oocyte technology (Table 2). Microarrays enable gene expression and embryo [12]. Then the primary oocytes are maintained for profiling, which gives the researcher the ability to monitor years, until puberty (menarche). Upon puberty the primary and quantify the expression of thousands of known genes at oocytes finish meiosis I, and a primary oocyte divides into two thesametime(e.g.,wholegenomemicroarray).Thismethod- daughter cells: a haploid secondary oocyte and an extruded ological breakthrough has the potential to provide detailed nonfunctional polar body. During the menstrual cycle only insight into cellular processes involved in the regulation of afewofprimary oocytes are recruited, and only one matures gene expression in different cell types, including oocytes and and is ovulated. When this secondary oocyte enters meiosis cumulus cells. (meiosis II), it does not finish but is arrested again and held at the metaphase II (MII) stage until fertilization. The MII-stage 3.1. Human Oocyte-Specific Genes. More studies elucidated oocytehasthepotentialtobefertilized.Whentheoocyteis the oocyte gene expression profile from different aspects; fertilized, the process of meiosis is terminated and the second most of these studies used the microarray technology and polar body is extruded. During the menstrual cycle only 15– are listed in Table 2.InthestudybyBermudez´ et al. [14], 20 early antral follicles/oocytes are recruited and only one microarray methods were used to examine the expression of dominant follicle matures fully and is ovulated. Each oocyte linearly amplified RNA from individual oocytes and groups develops and matures in the functional unit of the ovary— of five oocytes. In this study the amplification strategy the follicle. The primary oocytes grow and mature during consistently enabled a complex representative cDNA popu- the development and maturation of primordial, primary and lation. With this methodology a catalogue of 1,361 different secondary follicles, whereas the secondary oocytes develop transcripts expressed in human oocytes was identified; 406 alongwiththetertiaryandpreovulatingGraafianfollicle.This of them have been independently confirmed by other meth- process is regulated by hormones and other substances. ods. According to their function, the expression of several In the in vitro fertilization programme oocytes are ret- geneswasrelatedtoapoptosis,cellcycle,circadianrhythms, rieved after hormonal stimulation of patient’s ovaries and cytoskeleton, secretory pathways, exocytosis, endocytosis, by ultrasound guided aspiration. Oocytes at different stages kinases, membrane receptors, ion channels, mitochondria, of maturity can be retrieved. Most oocytes are mature structural nuclear proteins, phospholipases, protein degrada- metaphase II (MII) oocytes, while a relatively small propor- tion, protein synthesis, secreted proteins, signaling pathways, tion of oocytes are immature metaphase I (MI) oocytes and DNA, chromatin, RNA, transcription, and others. The results prophase I (PI) or germinal-vesicle- (GV-) stage oocytes. of this study highlighted the potential of microarray analyses The MII oocytes are characterized by a round shape,
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