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Vaccinia-related kinase 1 is required for the maintenance of undifferentiated spermatogonia in mouse male germ cells.


ABSTRACT: Vaccinia-related kinase 1 (VRK1) is a crucial protein kinase for mitotic regulation. VRK1 is known to play a role in germ cell development, and its deficiency results in sterility. Here we describe that VRK1 is essential for the maintenance of spermatogonial stem cells. To determine whether VRK1 plays a role in these cells, we assessed the population size of undifferentiated spermatogonia. Flow cytometry analyses showed that the number of undifferentiated spermatogonia was markedly reduced in VRK1-deficient testes. VRK1 was highly expressed in spermatogonial populations, and approximately 66% of undifferentiated spermatogonia that were sorted as an Ep-CAM+/c-kit-/alpha-6-integrin+ population showed a positive signal for VRK1. Undifferentiated stem cells expressing Plzf and Oct4 but not c-kit also expressed VRK1, suggesting that VRK1 is an intrinsic factor for the maintenance of spermatogonial stem cells. Microarray analyses of the global testicular transcriptome and quantitative RT-PCR of VRK1-deficient testes revealed significantly reduced expression levels of undifferentiated spermatogonial marker genes in early postnatal mice. Together, these results suggest that VRK1 is required for the proliferation and differentiation of undifferentiated spermatogonia, which are essential for spermatogenic cell maintenance.

SUBMITTER: Choi YH 

PROVIDER: S-EPMC3001494 | biostudies-literature | 2010 Dec

REPOSITORIES: biostudies-literature

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Vaccinia-related kinase 1 is required for the maintenance of undifferentiated spermatogonia in mouse male germ cells.

Choi Yoon Ha YH   Park Choon-Ho CH   Kim Wanil W   Ling Hua H   Kang Aram A   Chang Matthew Wook MW   Im Sun-Kyoung SK   Jeong Hyun-Woo HW   Kong Young-Yun YY   Kim Kyong-Tai KT  

PloS one 20101213 12


Vaccinia-related kinase 1 (VRK1) is a crucial protein kinase for mitotic regulation. VRK1 is known to play a role in germ cell development, and its deficiency results in sterility. Here we describe that VRK1 is essential for the maintenance of spermatogonial stem cells. To determine whether VRK1 plays a role in these cells, we assessed the population size of undifferentiated spermatogonia. Flow cytometry analyses showed that the number of undifferentiated spermatogonia was markedly reduced in VR  ...[more]

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