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Rissi VB, Glanzner WG, De Macedo MP, Gutierrez K, Baldassarre H, Gonçalves PBD, Bordignon V. The histone lysine demethylase KDM7A is required for normal development and first cell lineage specification in porcine embryos. Epigenetics 2019; 14:1088-1101. [PMID: 31216927 DOI: 10.1080/15592294.2019.1633864] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
There is growing evidence that histone lysine demethylases (KDMs) play critical roles in the regulation of embryo development. This study investigated if KDM7A, a lysine demethylase known to act on mono-(me1) and di-(me2) methylation of H3K9 and H3K27, participates in the regulation of early embryo development. Knockdown of KDM7A mRNA reduced blastocyst formation by 69.2% in in vitro fertilized (IVF), 48.4% in parthenogenetically activated (PA), and 48.1% in somatic cell nuclear transfer (SCNT) embryos compared to controls. Global immunofluorescence (IF) signal in KDM7A knockdown compared to control embryos was increased for H3K27me1 on D7, for H3K27me2 on D3 and D5, for H3K9me1 on D5 and D7, and for H3K9me2 on D5 embryos, but decreased for H3K9me1, me2 and me3 on D3. Moreover, KDM7A knockdown altered mRNA expression, including the downregulation of KDM3C on D3, NANOG on D5 and D7, and OCT4 on D7 embryos, and the upregulation of CDX2, KDM4B and KDM6B on D5 embryos. On D3 and D5 embryos, total cell number and mRNA expression of embryo genome activation (EGA) markers (EIF1AX and PPP1R15B) were not affected by KDM7A knockdown. However, the ratio of inner cell mass (ICM)/total number of cells in D7 blastocysts was reduced by 45.5% in KDM7A knockdown compared to control embryos. These findings support a critical role for KDM7A in the regulation of early development and cell lineage specification in porcine embryos, which is likely mediated through the modulation of H3K9me1/me2 and H3K27me1/me2 levels, and changes in the expression of other KDMs and pluripotency genes.
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Affiliation(s)
- Vitor Braga Rissi
- Laboratory of Biotechnology and Animal Reproduction - BioRep, Federal University of Santa Maria (UFSM) , Santa Maria , RS , Brazil
| | - Werner Giehl Glanzner
- Department of Animal Science, McGill University , Sainte Anne de Bellevue , QC , Canada
| | | | - Karina Gutierrez
- Department of Animal Science, McGill University , Sainte Anne de Bellevue , QC , Canada
| | - Hernan Baldassarre
- Department of Animal Science, McGill University , Sainte Anne de Bellevue , QC , Canada
| | - Paulo Bayard Dias Gonçalves
- Laboratory of Biotechnology and Animal Reproduction - BioRep, Federal University of Santa Maria (UFSM) , Santa Maria , RS , Brazil
| | - Vilceu Bordignon
- Department of Animal Science, McGill University , Sainte Anne de Bellevue , QC , Canada
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Cabot B, Cabot RA. Chromatin remodeling in mammalian embryos. Reproduction 2018; 155:R147-R158. [PMID: 29339454 DOI: 10.1530/rep-17-0488] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/12/2018] [Indexed: 12/28/2022]
Abstract
The mammalian embryo undergoes a dramatic amount of epigenetic remodeling during the first week of development. In this review, we discuss several epigenetic changes that happen over the course of cleavage development, focusing on covalent marks (e.g., histone methylation and acetylation) and non-covalent remodeling (chromatin remodeling via remodeling complexes; e.g., SWI/SNF-mediated chromatin remodeling). Comparisons are also drawn between remodeling events that occur in embryos from a variety of mammalian species.
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Affiliation(s)
- Birgit Cabot
- Department of Animal SciencesPurdue University, West Lafayette, Indiana, USA
| | - Ryan A Cabot
- Department of Animal SciencesPurdue University, West Lafayette, Indiana, USA
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Cao Z, Li Y, Chen Z, Wang H, Zhang M, Zhou N, Wu R, Ling Y, Fang F, Li N, Zhang Y. Genome-Wide Dynamic Profiling of Histone Methylation during Nuclear Transfer-Mediated Porcine Somatic Cell Reprogramming. PLoS One 2015; 10:e0144897. [PMID: 26683029 PMCID: PMC4687693 DOI: 10.1371/journal.pone.0144897] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 11/24/2015] [Indexed: 01/01/2023] Open
Abstract
The low full-term developmental efficiency of porcine somatic cell nuclear transfer (SCNT) embryos is mainly attributed to imperfect epigenetic reprogramming in the early embryos. However, dynamic expression patterns of histone methylation involved in epigenetic reprogramming progression during porcine SCNT embryo early development remain to be unknown. In this study, we characterized and compared the expression patterns of multiple histone methylation markers including transcriptionally repressive (H3K9me2, H3K9me3, H3K27me2, H3K27me3, H4K20me2 and H4K20me3) and active modifications (H3K4me2, H3K4me3, H3K36me2, H3K36me3, H3K79me2 and H3K79me3) in SCNT early embryos from different developmental stages with that from in vitro fertilization (IVF) counterparts. We found that the expression level of H3K9me2, H3K9me3 and H4K20me3 of SCNT embryos from 1-cell to 4-cell stages was significantly higher than that in the IVF embryos. We also detected a symmetric distribution pattern of H3K9me2 between inner cell mass (ICM) and trophectoderm (TE) in SCNT blastocysts. The expression level of H3K9me2 in both lineages from SCNT expanded blastocyst onwards was significantly higher than that in IVF counterparts. The expression level of H4K20me2 was significantly lower in SCNT embryos from morula to blastocyst stage compared with IVF embryos. However, no aberrant dynamic reprogramming of H3K27me2/3 occurred during early developmental stages of SCNT embryos. The expression of H3K4me3 was higher in SCNT embryos at 4-cell stage than that of IVF embryos. H3K4me2 expression in SCNT embryos from 8-cell stage to blastocyst stage was lower than that in the IVF embryos. Dynamic patterns of other active histone methylation markers were similar between SCNT and IVF embryos. Taken together, histone methylation exhibited developmentally stage-specific abnormal expression patterns in porcine SCNT early embryos.
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Affiliation(s)
- Zubing Cao
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
- State Key Laboratory for Agrobiotechnology, College of Biological Science, China Agricultural University, Haidian District, Beijing, China
| | - Yunsheng Li
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Zhen Chen
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Heng Wang
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Meiling Zhang
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Naru Zhou
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Ronghua Wu
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Yinghui Ling
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Fugui Fang
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
| | - Ning Li
- State Key Laboratory for Agrobiotechnology, College of Biological Science, China Agricultural University, Haidian District, Beijing, China
- * E-mail: (YHZ); (NL)
| | - Yunhai Zhang
- Anhui Provincial Laboratory of Local Livestock and Poultry Genetical Resource Conservation and Breeding, College of Animal Science and Technology, Anhui Agricultural University, Hefei City, Anhui Province, China
- * E-mail: (YHZ); (NL)
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Bogliotti YS, Ross PJ. Mechanisms of histone H3 lysine 27 trimethylation remodeling during early mammalian development. Epigenetics 2012; 7:976-81. [PMID: 22895114 DOI: 10.4161/epi.21615] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
During fertilization, two of the most differentiated cells in the mammalian organism, a sperm and oocyte, are combined to form a pluripotent embryo. Dynamic changes in chromatin structure allow the transition of the chromatin on these specialized cells into an embryonic configuration capable of generating every cell type. Initially, this reprogramming activity is supported by oocyte-derived factors accumulated during oogenesis as proteins and mRNAs; however, the underlying molecular mechanisms that govern it remain poorly characterized. Trimethylation of histone H3 at lysine 27 (H3K27me3) is a repressive epigenetic mark that changes dynamically during pre-implantation development in mice, bovine and pig embryos. Here we present data and hypotheses related to the potential mechanisms behind H3K27me3 remodeling during early development. We postulate that the repressive H3K27me3 mark is globally erased from the parental genomes in order to remove the gametic epigenetic program and to establish a pluripotent embryonic epigenome. We discuss information gathered in mice, pigs, and bovine, with the intent of providing a comparative analysis of the reprogramming of this epigenetic mark during early mammalian development.
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Affiliation(s)
- Yanina S Bogliotti
- Department of Animal Science, University of California, Davis, Davis, CA, USA
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Mason K, Liu Z, Aguirre-Lavin T, Beaujean N. Chromatin and epigenetic modifications during early mammalian development. Anim Reprod Sci 2012; 134:45-55. [PMID: 22921722 DOI: 10.1016/j.anireprosci.2012.08.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In mammals, the embryonic genome is transcriptionally inactive after fertilization and embryonic gene expression is initiated during the preimplantation developmental period, during so-called "embryonic genome activation (EGA)". EGA is dependent on the presence of the basal transcriptional machinery components but also on the parental genome reorganization after fertilization. Indeed, during the first cell cycles, the embryonic nuclei undergo intense remodelling that participates in the regulation of embryonic development. Among the mechanisms of this remodeling, it appears that modifications of epigenetic marks are essential especially at the time of embryonic genome activation. This review will focus on DNA methylation and histone modifications such as acetylation or methylation which are important to produce healthy embryos. We will also consider nuclear higher-order structures, such as chromosomes territories and pericentric heterochromatin clusters. The relevance of these chromatin epigenetic modifications has been sustained by the work performed on cloned embryos produced through nuclear transfer of somatic donor cells. It is indeed believed that incomplete reprogramming of the somatic nucleus, in other words, the incomplete re-establishment of the embryonic epigenetic patterns and peculiar nuclear organization may be among the causes of development failure of cloned animals. This will also be discussed in this review.
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Affiliation(s)
- Karlla Mason
- INRA, UMR 1198 Biologie du Développement et Reproduction, F-78350 Jouy en Josas, France
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Wang X, Park KE, Koser S, Liu S, Magnani L, Cabot RA. KPNA7, an oocyte- and embryo-specific karyopherin?subtype, is required for porcine embryo development. Reprod Fertil Dev 2012; 24:382-91. [DOI: 10.1071/rd11119] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Accepted: 06/15/2011] [Indexed: 01/26/2023] Open
Abstract
Coordinated partitioning of intracellular cargoes between nuclear and cytoplasmic compartments is critical for cell survival and differentiation. The karyopherin α/β heterodimer functions to import cytoplasmic proteins that possess classical nuclear localisation signals into the nucleus. Seven karyopherin α subtypes have been identified in mammals. The aim of this study was to determine the relative abundance of transcripts encoding seven karyopherin α subtypes in porcine oocytes and embryos at discrete stages of cleavage development, and to determine the developmental requirements of karypopherin α 7 (KPNA7), an oocyte and cleavage stage embryo-specific karyopherin α subtype. We hypothesised that knockdown of KPNA7 would negatively affect porcine cleavage development. To test this hypothesis, in vitro matured and fertilised porcine oocytes were injected with a double-stranded interfering RNA molecule that targeted KPNA7; nuclei were counted in all embryos 6 days after fertilisation. Embryos injected with KPNA7-interfering RNAs possessed significantly lower cell numbers than their respective control groups (P < 0.05). In vitro binding assays also suggest that KPNA7 may transport intracellular proteins that possess unique nuclear localisation signals. Our data suggest that embryos have differential requirements for individual karyopherin α subtypes and that these karyopherin α subtypes differentially transport intracellular cargo during cleavage development.
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Park KE, Johnson CM, Cabot RA. IVMBIX-01294, an inhibitor of the histone methyltransferase EHMT2, disrupts histone H3 lysine 9 (H3K9) dimethylation in the cleavage-stage porcine embryo. Reprod Fertil Dev 2012; 24:813-21. [DOI: 10.1071/rd11205] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Accepted: 12/03/2011] [Indexed: 11/23/2022] Open
Abstract
Global patterns of histone methylation are remodelled during cleavage development. Of the five histone methyltransferases known to mediate methylation of the lysine 9 residue of histone H3 (H3K9), euchromatic histone-lysine N-methyltransferase 2 (EHMT2; also known as G9a) has been shown to be a primary mediator of H3K9 dimethylation; BIX-01294 has been shown to be a specific inhibitor of EHMT2. The objective of the present study was to determine the effect of BIX-01294 treatment on global H3K9 dimethylation in porcine embryos. We hypothesised that inhibition of EHMT2 by BIX-01294 would result in reduced levels of H3K9 dimethylation and compromised embryo development. Our results showed that incubation in 5 µM BIX-01294 markedly reduced global levels of H3K9 dimethylation at the pronuclear, 2-cell and 4-cell stages of development and resulted in developmental arrest before blastocyst formation. Although transient exposure of embryos to BIX-01294 did not alter in vitro development, embryos transiently exposed to BIX-01294 did not establish pregnancy. These data demonstrate that BIX-01294 is a potent inhibitor of H3K9 dimethylation and that transient alterations in global histone modifications can have profound effects on embryo developmental potential.
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Park KE, Johnson CM, Wang X, Cabot RA. Differential developmental requirements for individual histone H3K9 methyltransferases in cleavage-stage porcine embryos. Reprod Fertil Dev 2011; 23:551-60. [PMID: 21557922 DOI: 10.1071/rd10280] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Accepted: 11/24/2010] [Indexed: 02/02/2023] Open
Abstract
Dimethylated H3K9 is a heritable epigenetic mark that is closely linked with transcriptional silencing and known to undergo global remodelling during cleavage development. Five mammalian histone methyltransferases (HMTases), namely Suv39H1, Suv39H2, SetDB1, EHMT1 and EHMT2, have been shown to mediate the methylation of H3K9. The aim of the present study was to determine the developmental requirements of these HMTases during cleavage development in porcine embryos. We hypothesised that knockdown of the abovementioned HMTases would differentially affect porcine cleavage development. To test this hypothesis, IVM and IVF porcine oocytes were divided into one of three treatment groups, including non-injected controls, oocytes injected with a double-stranded interfering RNA molecule specific for one of the HMTases and oocytes injected with a corresponding mutated (control) double-stranded RNA molecule. Nuclei were counted in all embryos 6 days after fertilisation. Although no significant difference in total cell number was detected in embryos injected with EHMT1 and EHMT2 interfering RNAs (compared with their respective control groups), embryos injected with interfering RNAs that targeted Suv39H1, Suv39H2 and SetDB1had significantly lower cell numbers than their respective control groups (P<0.05). This suggests that individual HMTases differentially affect in vitro developmental potential.
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Affiliation(s)
- Ki-Eun Park
- Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA
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Park KE, Johnson CM, Magnani L, Wang X, Biancardi MN, Cabot RA. Global H3K9 dimethylation status is not affected by transcription, translation, or DNA replication in porcine zygotes. Mol Reprod Dev 2010; 77:420-9. [DOI: 10.1002/mrd.21156] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Park KE, Magnani L, Cabot RA. Differential remodeling of mono- and trimethylated H3K27 during porcine embryo development. Mol Reprod Dev 2010; 76:1033-42. [PMID: 19536841 DOI: 10.1002/mrd.21061] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Histone methylation plays an important role in regulating chromatin structure and gene expression. Methylation of the lysine residue 27 of histone H3 (H3K27) is an epigenetic mark that is closely linked with transcriptional repression; global patterns of H3K27 methylation undergo dramatic changes during cleavage development in the mouse. The aim of this study was to characterize the H3K27 methylation pattern in cleavage stage porcine embryos obtained either by in vivo or in vitro fertilization or parthenogenetic activation and to determine the expression patterns of EED, EZH2, and SUZ12 (regulators of H3K27 methylation). We found that monomethylated H3K27 was detectable in the nuclei of oocytes and pronuclear, 2-cell, 4-cell, 8-cell, and blastocyst stage embryos. Trimethylated H3K27 was detectable in the nuclei of GV stage oocytes, the chromosome of MII stage oocytes and a single pronucleus of the pronuclear stage embryos produced by fertilization; the signals were faint or absent in nuclei of two-cell through blastocyst stage embryos. In addition, EED transcripts were increased from the four-cell stage (P < 0.05) in embryos obtained by in vitro fertilization, parthenogenetic activation and in vivo fertilization. EZH2 transcript levels were highest in the GV-stage oocyte (P < 0.05). SUZ12 transcripts were transiently increased at the four-cell stage (P < 0.05) in parthenogenetic and in vivo derived embryos. Our results suggest that H3K27 trimethylation is an epigenetic marker of maternally derived chromatin that is globally remodeled during porcine embryogenesis.
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Affiliation(s)
- Ki-Eun Park
- Department of Animal Sciences, Purdue University, West Lafayette, Indiana 47907, USA
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BARNETOVA I, FULKA H, FULKA, JR J. Epigenetic Characteristics of Paternal Chromatin in Interspecies Zygotes. J Reprod Dev 2010; 56:601-6. [DOI: 10.1262/jrd.09-172a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Irena BARNETOVA
- Institute of Animal Science
- Center for Cell Therapy and Tissue Repair
| | - Helena FULKA
- Institute of Animal Science
- Center for Cell Therapy and Tissue Repair
| | - Josef FULKA, JR
- Institute of Animal Science
- Center for Cell Therapy and Tissue Repair
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Hou J, Liu L, Zhang J, Cui XH, Yan FX, Guan H, Chen YF, An XR. Epigenetic modification of histone 3 at lysine 9 in sheep zygotes and its relationship with DNA methylation. BMC DEVELOPMENTAL BIOLOGY 2008; 8:60. [PMID: 18507869 PMCID: PMC2430946 DOI: 10.1186/1471-213x-8-60] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Accepted: 05/29/2008] [Indexed: 12/04/2022]
Abstract
Background Previous studies indicated that, unlike mouse zygotes, sheep zygotes lacked the paternal DNA demethylation event. Another epigenetic mark, histone modification, especially at lysine 9 of histone 3 (H3K9), has been suggested to be mechanically linked to DNA methylation. In mouse zygotes, the absence of methylated H3K9 from the paternal pronucleus has been thought to attribute to the paternal DNA demethylation. Results By using the immunofluorescence staining approach, we show that, despite the difference in DNA methylation, modification of H3K9 is similar between the sheep and mouse zygotes. In both species, H3K9 is hyperacetylated or hypomethylated in paternal pronucleus relative to maternal pronucleus. In fact, sheep zygotes can also undergo paternal DNA demethylation, although to a less extent than the mouse. Further examinations of individual zygotes by double immunostaining revealed that, the paternal levels of DNA methylation were not closely associated with that of H3K9 acetylation or tri-methylation. Treatment of either 5-azacytidine or Trichostatin A did not induce a significant decrease of paternal DNA methylation levels. Conclusion Our results suggest that in sheep lower DNA demethylation of paternal genomes is not due to the H3K9 modification and the methylated DNA sustaining in paternal pronucleus does not come from DNA de novo methylation.
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Affiliation(s)
- Jian Hou
- State Key Laboratory for Agrobiotechnology, College of Biological Science, China Agricultural University, Beijing 100094, PR China.
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