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Shi L, Zhou T, Huang Q, Zhang S, Li W, Zhang L, Hess RA, Pazour GJ, Zhang Z. Intraflagellar transport protein 74 is essential for spermatogenesis and male fertility in mice†. Biol Reprod 2020; 101:188-199. [PMID: 31004481 DOI: 10.1093/biolre/ioz071] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 03/22/2019] [Accepted: 04/18/2019] [Indexed: 12/30/2022] Open
Abstract
Intraflagellar transport protein 74 (IFT74) is a component of the core intraflagellar transport complex, a bidirectional movement of large particles along the axoneme microtubules for cilia formation. In this study, we investigated its role in sperm flagella formation and discovered that mice deficiency in Ift74 gene in male germ cells were infertile with low sperm count and immotile sperm. The few developed spermatozoa displayed misshaped heads and short tails. Transmission electron microscopy revealed abnormal flagellar axonemes in the seminiferous tubules where sperm are made. Clusters of unassembled microtubules were present in the spermatids. Testicular expression levels of IFT27, IFT57, IFT81, IFT88, and IFT140 proteins were significantly reduced in the conditional Ift74 mutant mice, with the exception of IFT20 and IFT25. The levels of outer dense fiber 2 and sperm-associated antigen 16L proteins were also not changed. However, the processed A-Kinase anchor protein, a major component of the fibrous sheath, a unique structure of sperm tail, was significantly reduced. Our study demonstrates that IFT74 is essential for mouse sperm formation, probably through assembly of the core axoneme and fibrous sheath, and suggests that IFT74 may be a potential genetic factor affecting male reproduction in man.
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Affiliation(s)
- Lin Shi
- School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, China.,Department of Physiology, Wayne State University, Detroit, Michigan, USA
| | - Ting Zhou
- School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, China.,Department of Physiology, Wayne State University, Detroit, Michigan, USA
| | - Qian Huang
- School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, China.,Department of Physiology, Wayne State University, Detroit, Michigan, USA
| | - Shiyang Zhang
- School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, China.,Department of Physiology, Wayne State University, Detroit, Michigan, USA
| | - Wei Li
- Department of Physiology, Wayne State University, Detroit, Michigan, USA
| | - Ling Zhang
- School of Public Health, Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Rex A Hess
- Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USA
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts, USA
| | - Zhibing Zhang
- Department of Physiology, Wayne State University, Detroit, Michigan, USA.,Department of Obstetrics/Gynecology, Wayne State University, Detroit, Michigan, USA
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Kodaka Y, Tanaka K, Kitajima K, Tanegashima K, Matsuda R, Hara T. LIM homeobox transcription factor Lhx2 inhibits skeletal muscle differentiation in part via transcriptional activation of Msx1 and Msx2. Exp Cell Res 2014; 331:309-19. [PMID: 25460335 DOI: 10.1016/j.yexcr.2014.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 11/14/2014] [Accepted: 11/15/2014] [Indexed: 11/16/2022]
Abstract
LIM homeobox transcription factor Lhx2 is known to be an important regulator of neuronal development, homeostasis of hair follicle stem cells, and self-renewal of hematopoietic stem cells; however, its function in skeletal muscle development is poorly understood. In this study, we found that overexpression of Lhx2 completely inhibits the myotube-forming capacity of C2C12 cells and primary myoblasts. The muscle dedifferentiation factors Msx1 and Msx2 were strongly induced by the Lhx2 overexpression. Short interfering RNA-mediated knockdown of Lhx2 in the developing limb buds of mouse embryos resulted in a reduction in Msx1 and Msx2 mRNA levels, suggesting that they are downstream target genes of Lhx2. We found two Lhx2 consensus-binding sites in the -2097 to -1189 genomic region of Msx1 and two additional sites in the -536 to +73 genomic region of Msx2. These sequences were shown by luciferase reporter assay to be essential for Lhx2-mediated transcriptional activation. Moreover, electrophoretic mobility shift assays and chromatin immunoprecipitation assays showed that Lhx2 is present in chromatin DNA complexes bound to the enhancer regions of the Msx1 and Msx2 genes. These data demonstrate that Msx1 and Msx2 are direct transcriptional targets of Lhx2. In addition, overexpression of Lhx2 significantly enhanced the mRNA levels of bone morphogenetic protein 4 and transforming growth factor beta family genes. We propose that Lhx2 is involved in the early stage of skeletal muscle development by inducing multiple differentiation inhibitory factors.
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Affiliation(s)
- Yusaku Kodaka
- Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-0041, Japan
| | - Kiyoko Tanaka
- Stem Cell Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan
| | - Kenji Kitajima
- Stem Cell Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan
| | - Kosuke Tanegashima
- Stem Cell Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan
| | - Ryoichi Matsuda
- Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-0041, Japan
| | - Takahiko Hara
- Stem Cell Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan; Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.
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