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Gorre, Nagaraju
Publications (4 of 4) Show all publications
Adhikari, D., Zheng, W., Shen, Y., Gorre, N., Ning, Y., Halet, G., . . . Liu, K. (2012). Cdk1, but not Cdk2, is the sole Cdk that is essential and sufficient to drive resumption of meiosis in mouse oocytes. Human Molecular Genetics, 21(11), 2476-2484
Open this publication in new window or tab >>Cdk1, but not Cdk2, is the sole Cdk that is essential and sufficient to drive resumption of meiosis in mouse oocytes
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2012 (English)In: Human Molecular Genetics, ISSN 0964-6906, E-ISSN 1460-2083, Vol. 21, no 11, p. 2476-2484Article in journal (Refereed) Published
Abstract [en]

Mammalian oocytes are arrested at the prophase of meiosis I during fetal or postnatal development, and the meiosis is resumed by the preovulatory surge of luteinizing hormone. The in vivo functional roles of cyclin-dependent kinases (Cdks) during the resumption of meiosis in mammalian oocytes are largely unknown. Previous studies have shown that deletions of Cdk3, Cdk4 or Cdk6 in mice result in viable animals with normal oocyte maturation, indicating that these Cdks are not essential for the meiotic maturation of oocytes. In addition, conventional knockout of Cdk1 and Cdk2 leads to embryonic lethality and postnatal follicular depletion, respectively, making it impossible to study the functions of Cdk1 and Cdk2 in oocyte meiosis. In this study, we generated conditional knockout mice with oocyte-specific deletions of Cdk1 and Cdk2. We showed that the lack of Cdk1, but not of Cdk2, leads to female infertility due to a failure of the resumption of meiosis in the oocyte. Re-introduction of Cdk1 mRNA into Cdk1-null oocytes largely resumed meiosis. Thus, Cdk1 is the sole Cdk that is essential and sufficient to drive resumption of meiosis in mouse oocytes. We also found that Cdk1 maintains the phosphorylation status of protein phosphatase 1 and lamin A/C in oocytes in order for meiosis resumption to occur.

National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:umu:diva-56192 (URN)10.1093/hmg/dds061 (DOI)000304053100008 ()
Available from: 2012-06-12 Created: 2012-06-12 Last updated: 2018-06-08Bibliographically approved
Zheng, W., Gorre, N., Shen, Y., Noda, T., Ogawa, W., Lundin, E. & Liu, K. (2010). Maternal phosphatidylinositol 3-kinase signalling is crucial for embryonic genome activation and preimplantation embryogenesis. EMBO Reports, 11(11), 890-895
Open this publication in new window or tab >>Maternal phosphatidylinositol 3-kinase signalling is crucial for embryonic genome activation and preimplantation embryogenesis
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2010 (English)In: EMBO Reports, ISSN 1469-221X, E-ISSN 1469-3178, Vol. 11, no 11, p. 890-895Article in journal (Refereed) Published
Abstract [en]

Maternal effect factors derived from oocytes are important for sustaining early embryonic development before the major wave of embryonic genome activation (EGA). In this study, we report a two-cell-stage arrest of embryos lacking maternal 3-phosphoinositide-dependent protein kinase 1 as a result of suppressed EGA. Concurrent deletion of maternal Pten completely rescued the suppressed EGA and embryonic progression through restored AKT signalling, which fully restored the fertility of double-mutant females. Our study identifies maternal phosphatidylinositol 3-kinase signalling as a new maternal effect factor that regulates EGA and preimplantation embryogenesis in mice.

Research subject
Pathology
Identifiers
urn:nbn:se:umu:diva-46368 (URN)10.1038/embor.2010.144 (DOI)000283507900016 ()20930845 (PubMedID)
Available from: 2011-08-31 Created: 2011-08-31 Last updated: 2018-06-08Bibliographically approved
Adhikari, D., Zheng, W., Shen, Y., Gorre, N., Hämäläinen, T., Cooney, A. J., . . . Liu, K. (2010). Tsc/mTORC1 signaling in oocytes governs the quiescence and activation of primordial follicles. Human Molecular Genetics, 19(3), 397-410
Open this publication in new window or tab >>Tsc/mTORC1 signaling in oocytes governs the quiescence and activation of primordial follicles
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2010 (English)In: Human Molecular Genetics, ISSN 0964-6906, E-ISSN 1460-2083, Vol. 19, no 3, p. 397-410Article in journal (Refereed) Published
Abstract [en]

To maintain the female reproductive lifespan, the majority of ovarian primordial follicles are preserved in a quiescent state in order to provide ova for later reproductive life. However, the molecular mechanism that maintains the long quiescence of primordial follicles is poorly understood. Here we provide genetic evidence to show that the tumor suppressor tuberous sclerosis complex 1 (Tsc1), which negatively regulates mammalian target of rapamycin complex 1 (mTORC1), functions in oocytes to maintain the quiescence of primordial follicles. In mutant mice lacking the Tsc1 gene in oocytes, the entire pool of primordial follicles is activated prematurely due to elevated mTORC1 activity in the oocyte, ending up with follicular depletion in early adulthood and causing premature ovarian failure (POF). We further show that maintenance of the quiescence of primordial follicles requires synergistic, collaborative functioning of both Tsc and PTEN (phosphatase and tensin homolog deleted on chromosome 10) and that these two molecules suppress follicular activation through distinct ways. Our results suggest that Tsc/mTORC1 signaling and PTEN/PI3K (phosphatidylinositol 3 kinase) signaling synergistically regulate the dormancy and activation of primordial follicles, and together ensure the proper length of female reproductive life. Deregulation of these signaling pathways in oocytes results in pathological conditions of the ovary, including POF and infertility.

Identifiers
urn:nbn:se:umu:diva-42927 (URN)10.1093/hmg/ddp483 (DOI)000273227200001 ()19843540 (PubMedID)
Available from: 2011-04-14 Created: 2011-04-14 Last updated: 2018-06-08Bibliographically approved
Adhikari, D., Flohr, G., Gorre, N., Shen, Y., Yang, H., Lundin, E., . . . Liu, K. (2009). Disruption of Tsc2 in oocytes leads to overactivation of the entire pool of primordial follicles. Molecular human reproduction, 15(12), 765-770
Open this publication in new window or tab >>Disruption of Tsc2 in oocytes leads to overactivation of the entire pool of primordial follicles
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2009 (English)In: Molecular human reproduction, ISSN 1360-9947, E-ISSN 1460-2407, Vol. 15, no 12, p. 765-770Article in journal (Refereed) Published
Abstract [en]

To maintain the length of reproductive life in a woman, it is essential that most of her ovarian primordial follicles are maintained in a quiescent state to provide a continuous supply of oocytes. However, our understanding of the molecular mechanisms that control the quiescence and activation of primordial follicles is still in its infancy. In this study, we provide some genetic evidence to show that the tumor suppressor tuberous sclerosis complex 2 (Tsc2), which negatively regulates mammalian target of rapamycin complex 1 (mTORC1), functions in oocytes to maintain the dormancy of primordial follicles. In mutant mice lacking the Tsc2 gene in oocytes, the pool of primordial follicles is activated prematurely due to elevated mTORC1 activity in oocytes. This results in depletion of follicles in early adulthood, causing premature ovarian failure (POF). Our results suggest that the Tsc1-Tsc2 complex mediated suppression of mTORC1 activity is indispensable for maintenance of the dormancy of primordial follicles, thus preserving the follicular pool, and that mTORC1 activity in oocytes promotes follicular activation. Our results also indicate that deregulation of Tsc/mTOR signaling in oocytes may cause pathological conditions of the ovary such as infertility and POF.

Place, publisher, year, edition, pages
Oxford University Press, 2009
National Category
Biophysics Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
urn:nbn:se:umu:diva-36336 (URN)10.1093/molehr/gap092 (DOI)19843635 (PubMedID)
Available from: 2010-09-28 Created: 2010-09-28 Last updated: 2018-06-08Bibliographically approved
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