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The Oocyte-Specific Linker Histone H1FOO Is Not Essential for Mouse Oogenesis and Fertility. Cells 2022; 11:cells11223706. [PMID: 36429134 PMCID: PMC9688445 DOI: 10.3390/cells11223706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 11/16/2022] [Accepted: 11/18/2022] [Indexed: 11/23/2022] Open
Abstract
Meiosis is a highly conserved specialized cell division process that generates haploid gametes. Many of its events are associated with dynamically regulated chromosomal structures and chromatin remodeling, which are mainly modulated by histone modifications. Histone H1 is a linker histone essential for packing the nucleosome into higher-order structures, and H1FOO (H1 histone family, member O, oocyte-specific) is a H1 variant whose expression pattern is restricted to growing oocytes and zygotes. To further explore the function of H1FOO, we generated mice lacking the H1foo gene by the CRISPR/Cas9 technique. Herein, we combine mouse genetics and cellular studies to show that H1foo-null mutants have no overt phenotype, with both males and females being fertile and presenting no gross defects in meiosis progression nor in synapsis dynamics. Accordingly, the histological sections show a normal development of gametes in both male and female mice. Considering the important role of oocyte constituents in enhancing mammalian somatic cell reprogramming, we analyzed iPSCs generation in H1foo mutant MEFs and observed no differences in the absence of H1FOO. Taken all together, in this work we present the first in vivo evidence of H1FOO dispensability for mouse fertility, clarifying the debate in the field surrounding its essentiality in meiosis.
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Wang L, Hand JM, Fu L, Smith GW, Yao J. DNA methylation and miRNA-1296 act in concert to mediate spatiotemporal expression of KPNA7 during bovine oocyte and early embryonic development. BMC DEVELOPMENTAL BIOLOGY 2019; 19:23. [PMID: 31787077 PMCID: PMC6886206 DOI: 10.1186/s12861-019-0204-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 10/27/2019] [Indexed: 11/10/2022]
Abstract
BACKGROUND Epigenetic regulation of oocyte-specific maternal factors is essential for oocyte and early embryonic development. KPNA7 is an oocyte-specific maternal factor, which controls transportation of nuclear proteins important for early embryonic development. To elucidate the epigenetic mechanisms involved in the controlled expression of KPNA7, both DNA methylation associated transcriptional silencing and microRNA (miRNA)-mediated mRNA degradation of KPNA7 were examined. RESULTS Comparison of DNA methylation profiles at the proximal promoter of KPNA7 gene between oocyte and 6 different somatic tissues identified 3 oocyte-specific differentially methylated CpG sites. Expression of KPNA7 mRNA was reintroduced in bovine kidney-derived CCL2 cells after treatment with the methylation inhibitor, 5-aza-2'-deoxycytidine (5-Aza-CdR). Analysis of the promoter region of KPNA7 gene in CCL2 cells treated with 5-Aza-CdR showed a lighter methylation rate in all the CpG sites. Bioinformatic analysis predicted 4 miRNA-1296 binding sites in the coding region of KPNA7 mRNA. Ectopic co-expression of miRNA-1296 and KPNA7 in HEK293 cells led to reduced expression of KPNA7 protein. Quantitative real time PCR (RT-qPCR) analysis revealed that miRNA-1296 is expressed in oocytes and early stage embryos, and the expression reaches a peak level in 8-cell stage embryos, coincident with the time of embryonic genome activation and the start of declining of KPNA7 expression. CONCLUSIONS These results suggest that DNA methylation may account for oocyte-specific expression of KPNA7, and miRNA-1296 targeting the coding region of KPNA7 is a potential mechanism for KPNA7 transcript degradation during the maternal-to-zygotic transition.
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Affiliation(s)
- Lei Wang
- Laboratory of Animal Biotechnology and Genomics, Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, WV, 26506, USA
| | - Jacqelyn M Hand
- Laboratory of Animal Biotechnology and Genomics, Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, WV, 26506, USA
| | - Liyuan Fu
- Laboratory of Animal Biotechnology and Genomics, Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, WV, 26506, USA
| | - George W Smith
- Laboratory of Mammalian Reproductive Biology and Genomics, Departments of Animal Science and Physiology, Michigan State University, East Lansing, MI, 48824, USA
| | - Jianbo Yao
- Laboratory of Animal Biotechnology and Genomics, Division of Animal and Nutritional Sciences, West Virginia University, Morgantown, WV, 26506, USA.
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Chi D, Zeng Y, Xu M, Si L, Qu X, Liu H, Li J. LC3-Dependent Autophagy in Pig 2-Cell Cloned Embryos Could Influence the Degradation of Maternal mRNA and the Regulation of Epigenetic Modification. Cell Reprogram 2017; 19:354-362. [PMID: 29058487 DOI: 10.1089/cell.2017.0016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
In this study, the distribution as well as the effect of autophagy on reprogramming in pig cloned embryos were observed immediately after somatic cell nuclear transfer. Results showed that the LC3 was at the highest level in cloned embryos at 2-cell stage, and it decreased with the development from 2-cell stage to blastocyst. Different to cloned embryos, the intensity of LC3 in parthenogenetic activation (PA) embryos was at the highest level at 4-cell stage. A markedly higher level of Bmp15, H1foo, and Dppa3 was shown in cloned embryos at 2-cell stage (p < 0.05 or p < 0.01), but a significantly lower level of LC3, Sox2, and eIF1A was observed at 4-cell stage (p < 0.05), compared with PA embryos. When the efficient interfering by the LC3 siRNA was performed on the cloned embryos (p < 0.01), not only the mRNA level of maternal Cyclin B, Bmp15, Gdf9, c-mos, H1foo, and Dppa3 was increased significantly (p < 0.05), but also the expression of Dnmt1 and Dnmt3b was obviously upregulated (p < 0.05). Although the expression of Sox2 and Oct4 is not changed, the expression of Stat3 decreased significantly (p < 0.05). Furthermore with the treatment of 200 nM rapamycin, the expression of eIF1A and Stat3 was significantly increased at 4-cell stage. In conclusion, the LC3-dependent autophagy mainly occurred in cloned embryos at 2-cell stage, but at 4-cell stage in PA embryos. In addition, the modulation of autophagy could affect genome activation by influencing the degradation of maternal mRNA and regulating the expression of DNA methyltransferase.
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Affiliation(s)
- Daming Chi
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Yaqiong Zeng
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Mingzhu Xu
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Linan Si
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Xiao Qu
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Honglin Liu
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
| | - Juan Li
- College of Animal Science and Technology, Nanjing Agricultural University , Nanjing Weigang No. 1, Jiangsu Province, P.R. China
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Pérez-Montero S, Carbonell A, Azorín F. Germline-specific H1 variants: the "sexy" linker histones. Chromosoma 2015; 125:1-13. [PMID: 25921218 DOI: 10.1007/s00412-015-0517-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 04/14/2015] [Accepted: 04/15/2015] [Indexed: 01/07/2023]
Abstract
The eukaryotic genome is packed into chromatin, a nucleoprotein complex mainly formed by the interaction of DNA with the abundant basic histone proteins. The fundamental structural and functional subunit of chromatin is the nucleosome core particle, which is composed by 146 bp of DNA wrapped around an octameric protein complex formed by two copies of each core histone H2A, H2B, H3, and H4. In addition, although not an intrinsic component of the nucleosome core particle, linker histone H1 directly interacts with it in a monomeric form. Histone H1 binds nucleosomes near the exit/entry sites of linker DNA, determines nucleosome repeat length and stabilizes higher-order organization of nucleosomes into the ∼30 nm chromatin fiber. In comparison to core histones, histone H1 is less well conserved through evolution. Furthermore, histone H1 composition in metazoans is generally complex with most species containing multiple variants that play redundant as well as specific functions. In this regard, a characteristic feature is the presence of specific H1 variants that replace somatic H1s in the germline and during early embryogenesis. In this review, we summarize our current knowledge about their structural and functional properties.
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Affiliation(s)
- Salvador Pérez-Montero
- Institute of Molecular Biology of Barcelona, CSIC, Baldiri Reixac, 4, 08028, Barcelona, Spain.,Institute for Research in Biomedicine, IRB Barcelona, Baldiri Reixac, 10, 08028, Barcelona, Spain
| | - Albert Carbonell
- Institute of Molecular Biology of Barcelona, CSIC, Baldiri Reixac, 4, 08028, Barcelona, Spain.,Institute for Research in Biomedicine, IRB Barcelona, Baldiri Reixac, 10, 08028, Barcelona, Spain
| | - Fernando Azorín
- Institute of Molecular Biology of Barcelona, CSIC, Baldiri Reixac, 4, 08028, Barcelona, Spain. .,Institute for Research in Biomedicine, IRB Barcelona, Baldiri Reixac, 10, 08028, Barcelona, Spain.
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Denomme MM, Mann MRW. Maternal control of genomic imprint maintenance. Reprod Biomed Online 2013; 27:629-36. [PMID: 24125946 DOI: 10.1016/j.rbmo.2013.06.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 06/03/2013] [Accepted: 06/12/2013] [Indexed: 11/17/2022]
Abstract
Genomic imprinting is a specialized transcriptional phenomenon that employs epigenetic mechanisms to facilitate parental-specific expression. Perturbations in parental epigenetic asymmetry can lead to the development of imprinting disorders, such as Beckwith-Wiedemann syndrome and Angelman syndrome. DNA methylation is one of the most widely studied epigenetic marks that characterizes imprinted regions. During gametogenesis and early embryogenesis, imprinted methylation undergoes a cycle of erasure, acquisition and maintenance. Gamete and embryo manipulations for the purpose of assisted reproduction are performed during these reprogramming events and may lead to their disruption. Recent studies point to the role of maternal-effect proteins in imprinted gene regulation. Studies are now required to increase understanding of how these factors regulate genomic imprinting as well as how assisted reproduction technologies may alter their function.
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Affiliation(s)
- Michelle M Denomme
- Department of Obstetrics and Gynecology, University of Western Ontario, Schulich School of Medicine and Dentistry, London, Ontario, Canada; Department of Biochemistry, University of Western Ontario, Schulich School of Medicine and Dentistry, London, Ontario, Canada; Children's Health Research Institute, London, Ontario, Canada N6C 2V5
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Hirabayashi K, Shiota K, Yagi S. DNA methylation profile dynamics of tissue-dependent and differentially methylated regions during mouse brain development. BMC Genomics 2013; 14:82. [PMID: 23387509 PMCID: PMC3599493 DOI: 10.1186/1471-2164-14-82] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2012] [Accepted: 01/31/2013] [Indexed: 01/23/2023] Open
Abstract
Background Tissues and their component cells have unique DNA methylation profiles comprising DNA methylation patterns of tissue-dependent and differentially methylated regions (T-DMRs). Previous studies reported that DNA methylation plays crucial roles in cell differentiation and development. Here, we investigated the genome-wide DNA methylation profiles of mouse neural progenitors derived from different developmental stages using HpyCH4IV, a methylation-sensitive restriction enzyme that recognizes ACGT residues, which are uniformly distributed across the genome. Results Using a microarray-based genome-wide DNA methylation analysis system focusing on 8.5-kb regions around transcription start sites (TSSs), we analyzed the DNA methylation profiles of mouse neurospheres derived from telencephalons at embryonic days 11.5 (E11.5NSph) and 14.5 (E14.5NSph) and the adult brain (AdBr). We identified T-DMRs with different DNA methylation statuses between E11.5NSph and E14.5NSph at genes involved in neural development and/or associated with neurological disorders in humans, such as Dclk1, Nrcam, Nfia, and Ntng1. These T-DMRs were located not only within 2 kb but also distal (several kbs) from the TSSs, and those hypomethylated in E11.5NSph tended to be in CpG island (CGI-) associated genes. Most T-DMRs that were hypomethylated in neurospheres were also hypomethylated in the AdBr. Interestingly, among the T-DMRs hypomethylated in the progenitors, there were T-DMRs that were hypermethylated in the AdBr. Although certain genes, including Ntng1, had hypermethylated T-DMRs 5′ upstream, we identified hypomethylated T-DMRs in the AdBr, 3′ downstream from their TSSs. This observation could explain why Ntng1 was highly expressed in the AdBr despite upstream hypermethylation. Conclusion Mouse adult brain DNA methylation and gene expression profiles could be attributed to developmental dynamics of T-DMRs in neural-related genes.
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Affiliation(s)
- Keiji Hirabayashi
- Laboratory of Cellular Biochemistry, Department of Animal Resource Sciences/Veterinary Medical Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
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Hayakawa K, Ohgane J, Tanaka S, Yagi S, Shiota K. Oocyte-specific linker histone H1foo is an epigenomic modulator that decondenses chromatin and impairs pluripotency. Epigenetics 2012; 7:1029-36. [PMID: 22868987 DOI: 10.4161/epi.21492] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Mammalian oocytes contain the histone H1foo, a distinct member with low sequence similarity to other members in the H1 histone family. Oocyte-specific H1foo exists until the second embryonic cell stage. H1foo is essential for oocyte maturation in mice; however, the molecular function of this H1 subtype is unclear. To explore the function of H1foo, we generated embryonic stem (ES) cells ectopically expressing H1foo fused to an EGFP (H1foo-ES). Interestingly, ectopic expression of H1foo prevented normal differentiation into embryoid bodies (EBs). The EB preparations from H1foo-ES cells maintained the expression of pluripotent marker genes, including Nanog, Myc and Klf9, and prevented the shift of the DNA methylation profile. Because the short hairpin RNA-mediated knockdown of H1foo-EGFP recovered the differentiation ability, H1foo was involved in preventing differentiation. Furthermore, ChIP analysis revealed that H1foo-EGFP bound selectively to a set of hypomethylated genomic loci in H1foo-ES, clearly indicating that these loci were targets of H1foo. Finally, nuclease sensitivity assay suggested that H1foo made these target loci decondensed. We concluded that H1foo has an impact on the genome-wide, locus-specific epigenetic status.
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Affiliation(s)
- Koji Hayakawa
- Laboratory of Cellular Biochemistry, Department of Animal Resource Sciences/Veterinary Medical Sciences, The University of Tokyo, Tokyo, Japan
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Pan B, Chao H, Chen B, Zhang L, Li L, Sun X, Shen W. DNA methylation of germ-cell-specific basic helix-loop-helix (HLH) transcription factors, Sohlh2 and Figl during gametogenesis. Mol Hum Reprod 2011; 17:550-61. [DOI: 10.1093/molehr/gar017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Rivera RM. Epigenetic aspects of fertilization and preimplantation development in mammals: lessons from the mouse. Syst Biol Reprod Med 2011; 56:388-404. [PMID: 20849224 DOI: 10.3109/19396368.2010.482726] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
During gametogenesis, the parental genomes are separated and are epigenetically marked by modifications that will direct the expression profile of genes necessary for meiosis as well as for the formation of the oocyte and sperm cell. Immediately after sperm-egg fusion, the parental haploid genomes show great epigenetic asymmetry with differences in the levels of DNA methylation and histone tail modifications. The epigenetic program acquired during oogenesis and spermatogenesis must be reset for the zygote to successfully proceed through preimplantation development and this occurs as the two genomes approach each other in preparation for karyogamy. During preimplantation development, the embryo is vested with the responsibility of maintaining the primary imprints. In addition, female embryos must silence one of the X-chromosomes in order to transcribe equal levels of X-linked genes as their male counterparts. This review is intended as a survey of the epigenetic modifications and mechanisms present in zygotes and preimplantation mouse embryos, namely DNA methylation, histone modifications, dosage compensation, genomic imprinting, and regulation by non-coding RNAs.
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Muramoto H, Yagi S, Hirabayashi K, Sato S, Ohgane J, Tanaka S, Shiota K. Enrichment of short interspersed transposable elements to embryonic stem cell-specific hypomethylated gene regions. Genes Cells 2010; 15:855-65. [DOI: 10.1111/j.1365-2443.2010.01423.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Beall S, Brenner C, Segars J. Oocyte maturation failure: a syndrome of bad eggs. Fertil Steril 2010; 94:2507-13. [PMID: 20378111 DOI: 10.1016/j.fertnstert.2010.02.037] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2009] [Revised: 02/15/2010] [Accepted: 02/16/2010] [Indexed: 11/29/2022]
Abstract
To show that disruption of meiotic competence results in cell cycle arrest, and the production of immature oocytes that are not capable of fertilization. Through an extensive review of animal studies and clinical case reports, we define the syndrome of oocyte maturation failure as a distinct oocyte disorder, present a classification system based on clinical parameters, and discuss the potential molecular origins for the disease.
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Affiliation(s)
- Stephanie Beall
- Department of Obstetrics and Gynecology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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