Mol. Hum. Reprod. Advance Access originally published online on November 7, 2008
Molecular Human Reproduction 2008 14(12):673-678; doi:10.1093/molehr/gan064
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This article appears in the following Molecular Human Reproduction issue: Special Issue: Emerging Technologies for the Assessment of Gametes and Embryos - The OMICS [View the issue table of contents]
Revisiting oocyte–somatic cell interactions: in search of novel intrafollicular predictors and regulators of oocyte developmental competence
1Department of Pathology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA 2Houston IVF, Memorial Hermann Memorial City Hospital, Houston, TX 77024, USA 3Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA 4Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA
5 Correspondence address: Tel: +1 713-798-6451; Fax: +1 713-798-5833; E-mail: mmatzuk{at}bcm.tmc.edu
Prediction and improvement of oocyte competence are two critical issues in assisted reproductive technology to improve infertility therapy. The lack of reliable and objective predictors of oocyte developmental competence for oocyte/embryo selection during in vitro fertilization hampers the effectiveness of this technology. Likewise, the low pregnancy rate resulting from in vitro maturation of human oocytes represents a major obstacle for its clinical application. Oocyte competence is progressively acquired during follicular development, and the oocyte plays a dominant role in regulating granulosa cell functions and maintaining the microenvironment appropriate for the development of its competence. Hence, granulosa cell functions are reflective of oocyte competence, and molecular markers of granulosa cells are potentially reliable predictors of oocyte quality. With the advent of the functional genomics era, the transcriptome of granulosa cells has been extensively characterized. Experimental data supporting granulosa cell markers as predictors of oocyte competence are now emerging in both animal models and humans. Future efforts should focus on integrating granulosa cell genetic markers as parameters for oocyte/embryo selection. Moreover, novel in vitro evidence highlights the effectiveness of exogenous oocyte-secreted factors in promoting oocyte developmental competence in animal models. The challenge in evaluating the effect of oocyte-secreted factors on oocyte quality in a clinical setting is to standardize the various preparations of these recombinant proteins and decipher their complex interactions/cooperativity within the germline-somatic cell regulatory loop.
Submitted on September 3, 2008; resubmitted on October 27, 2008; accepted on October 29, 2008.
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