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      SRSFs mediate the function of AR in the ovarian granulosa cells of patients with PCOS

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          Abstract

          Ovarian hyperandrogenism is one of the characteristics of polycystic ovary syndrome (PCOS) and androgen receptor (AR) in ovarian granulosa cells (GCs) functions as an important element to the accumulation of androgens. This study verified the existence of alternative splicing variant of AR (AR-SVs) in the GCs of PCOS patients and found that the function of AR decreased significantly in the presence of AR-SVs. And compared to the normal individuals, the expression of Serine/arginine-rich splicing factor 2(SRSF2) was higher and the expression of SRSF3 was lower in the GCs of patients with AR-SVs. More importantly, we found that the expression of SRSF2 was inhibited and that the expression of AR was decreased after the successful upregulation of miRNA-183, and testostrone (T) concentrations in the culture medium were increased. The results also showed that the expression of SRSF3 decreased when miRNA-124 was successfully upregulated, while the expression of AR significantly increased; however, the function of AR was also inhibited when T concentration in the culture medium was increased. This study has proved that SRSFs are regulated by corresponding miRNAs, and the altered expression of SRSFs interferenced the alternative splicing process of AR and ultimately decreased the function of AR, leading to the accumulation of androgens in the ovary.

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          Nuclear m(6)A Reader YTHDC1 Regulates mRNA Splicing.

          Wen Sara Xiao, Samir Adhikari, Ujwal Dahal … (2016)
          The regulatory role of N(6)-methyladenosine (m(6)A) and its nuclear binding protein YTHDC1 in pre-mRNA splicing remains an enigma. Here we show that YTHDC1 promotes exon inclusion in targeted mRNAs through recruiting pre-mRNA splicing factor SRSF3 (SRp20) while blocking SRSF10 (SRp38) mRNA binding. Transcriptome assay with PAR-CLIP-seq analysis revealed that YTHDC1-regulated exon-inclusion patterns were similar to those of SRSF3 but opposite of SRSF10. In vitro pull-down assay illustrated a competitive binding of SRSF3 and SRSF10 to YTHDC1. Moreover, YTHDC1 facilitates SRSF3 but represses SRSF10 in their nuclear speckle localization, RNA-binding affinity, and associated splicing events, dysregulation of which, as the result of YTHDC1 depletion, can be restored by reconstitution with wild-type, but not m(6)A-binding-defective, YTHDC1. Our findings provide the direct evidence that m(6)A reader YTHDC1 regulates mRNA splicing through recruiting and modulating pre-mRNA splicing factors for their access to the binding regions of targeted mRNAs.
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            Polycystic ovary syndrome.

            Richard S Legro, Theresa Hickey, J. Norman … (2007)
            Polycystic ovary syndrome is a heterogeneous endocrine disorder that affects about one in 15 women worldwide. The major endocrine disruption is excessive androgen secretion or activity, and a large proportion of women also have abnormal insulin activity. Many body systems are affected in polycystic ovary syndrome, resulting in several health complications, including menstrual dysfunction, infertility, hirsutism, acne, obesity, and metabolic syndrome. Women with this disorder have an established increased risk of developing type 2 diabetes and a still debated increased risk of cardiovascular disease. The diagnostic traits of polycystic ovary syndrome are hyperandrogenism, chronic anovulation, and polycystic ovaries, after exclusion of other conditions that cause these same features. A conclusive definition of the disorder and the importance of the three diagnostic criteria relative to each other remain controversial. The cause of polycystic ovary syndrome is unknown, but studies suggest a strong genetic component that is affected by gestational environment, lifestyle factors, or both.
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              Positions statement: criteria for defining polycystic ovary syndrome as a predominantly hyperandrogenic syndrome: an Androgen Excess Society guideline.

              Terrie Taylor, Enrico Carmina, Ricardo Azziz … (2007)
              The Androgen Excess Society (AES) charged a task force to review all available data and recommend an evidence-based definition for polycystic ovary syndrome (PCOS), whether already in use or not, to guide clinical diagnosis and future research. Participants included expert investigators in the field. Based on a systematic review of the published peer-reviewed medical literature, by querying MEDLINE databases, we tried to identify studies evaluating the epidemiology or phenotypic aspects of PCOS. The task force drafted the initial report, following a consensus process via electronic communication, which was then reviewed and critiqued by the AES Board of Directors. No section was finalized until all members were satisfied with the contents and minority opinions noted. Statements that were not supported by peer-reviewed evidence were not included. Based on the available data, it is the view of the AES Task Force on the Phenotype of PCOS that there should be acceptance of the original 1990 National Institutes of Health criteria with some modifications, taking into consideration the concerns expressed in the proceedings of the 2003 Rotterdam conference. A principal conclusion was that PCOS should be first considered a disorder of androgen excess or hyperandrogenism, although a minority considered the possibility that there may be forms of PCOS without overt evidence of hyperandrogenism but recognized that more data are required before validating this supposition. Finally, the task force recognized, and fully expects, that the definition of this syndrome will evolve over time to incorporate new research findings.
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                Author and article information

                Contributors
                Zhu Yang
                Journal
                Journal ID (nlm-ta): Genes Dis
                Journal ID (iso-abbrev): Genes Dis
                Title: Genes & Diseases
                Publisher: Chongqing Medical University
                ISSN (Print): 2352-4820
                ISSN (Electronic): 2352-3042
                Publication date PMC-release: 17 September 2019
                Publication date Collection: January 2021
                Publication date (Electronic): 17 September 2019
                Volume: 8
                Issue: 1
                Pages: 94-109
                Affiliations
                [a ]Gynecology and Obstetrics of the Second Affiliated Hospital of Chongqing Medical University, Chongqing, PR China
                [b ]Gynecologic Endocrinology of Chongqing Health Center for Women and Children, Chongqing, PR China
                Author notes
                [∗ ]Corresponding author. yangzhu@ 123456hospital.cqmu.edu.cn
                Article
                Publisher Item ID: S2352-3042(19)30074-1
                DOI: 10.1016/j.gendis.2019.09.005
                PMC ID: 7859457
                PubMed ID: 33569518
                SO-VID: e62e8c4c-99b6-49bb-b94a-8007a5024c51
                Copyright © © 2019 Chongqing Medical University. Production and hosting by Elsevier B.V.
                License:

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                Date received : 20 April 2019
                Date revision received : 26 August 2019
                Date accepted : 4 September 2019
                Categories
                Subject: Full Length Article

                Keywords: androgen receptor,granulosa cells,hyperandrogenism,mirnas,pcos,srsfs
                Data availability:
                Keywords: androgen receptor, granulosa cells, hyperandrogenism, mirnas, pcos, srsfs

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