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Luo Y, Li J, Zheng L, Reyimjan Y, Ma Y, Huang S, Liu H, Zhou G, Bai J, Zhu Y, Sun Y, Zou X, Hou Y, Fu X. Procyanidin B2 improves developmental capacity of bovine oocytes via promoting PPARγ/UCP1-mediated uncoupling lipid catabolism during in vitro maturation. Cell Prolif 2024:e13687. [PMID: 38864666 DOI: 10.1111/cpr.13687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 05/20/2024] [Accepted: 05/25/2024] [Indexed: 06/13/2024] Open
Abstract
Metabolic balance is essential for oocyte maturation and acquisition of developmental capacity. Suboptimal conditions of in vitro cultures would lead to lipid accumulation and finally result in disrupted oocyte metabolism. However, the effect and mechanism underlying lipid catabolism in oocyte development remain elusive currently. In the present study, we observed enhanced developmental capacity in Procyanidin B2 (PCB2) treated oocytes during in vitro maturation. Meanwhile, reduced oxidative stress and declined apoptosis were found in oocytes after PCB2 treatment. Further studies confirmed that oocytes treated with PCB2 preferred to lipids catabolism, leading to a notable decrease in lipid accumulation. Subsequent analyses revealed that mitochondrial uncoupling was involved in lipid catabolism, and suppression of uncoupling protein 1 (UCP1) would abrogate the elevated lipid consumption mediated by PCB2. Notably, we identified peroxisome proliferator-activated receptor gamma (PPARγ) as a potential target of PCB2 by docking analysis. Subsequent mechanistic studies revealed that PCB2 improved oocyte development capacity and attenuated oxidative stress by activating PPARγ mediated mitochondrial uncoupling. Our findings identify that PCB2 intricately improves oocyte development capacity through targeted activation of the PPARγ/UCP1 pathway, fostering uncoupling lipid catabolism while concurrently mitigating oxidative stress.
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Affiliation(s)
- Yuwen Luo
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- College of Biological Sciences, China Agricultural University, Beijing, China
| | - Jun Li
- Department of Reproductive Medicine, Reproductive Medical Center, The First Hospital of Hebei Medical University, Shijiazhuang, Hebei, China
| | - Lv Zheng
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yizaitiguli Reyimjan
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yan Ma
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Shuaixiang Huang
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Hongyu Liu
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Guizhen Zhou
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Jiachen Bai
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yixiao Zhu
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yidan Sun
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- College of Biological Sciences, China Agricultural University, Beijing, China
| | - Xinhua Zou
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yunpeng Hou
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- College of Biological Sciences, China Agricultural University, Beijing, China
| | - Xiangwei Fu
- State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing, China
- National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics, Breeding and Reproduction of the MARA, Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
- State Key Laboratory of Sheep Genetic Improvement and Healthy Breeding, Xinjiang Academy of Agricultural and Reclamation Sciences, Shihezi, Xinjiang, China
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Abstract
Somatic cell nuclear transfer (SCNT) is a powerful technique, although challenging, to study reprograming into the totipotent state of differentiated nuclei in mammals. This procedure was initially applied in farm animals, then rodents, and more recently in primates. Nuclear transfer of embryonic stem cells is known to be more efficient, but many types of somatic cells have now been successfully reprogramed with this procedure. Moreover, SCNT reprograming is more effective on a per cell basis than induced Pluripotent Stem Cells (iPSC) and provides interesting clues regarding the underlying processes. In this chapter, we describe the protocol of nuclear transfer in mouse that combines cell cycle synchronization of the donor cells, enucleation of metaphase II oocyte and Piezo-driven injection of a donor cell nucleus followed by activation of the reconstructed embryos and nonsurgical transfer into pseudo-pregnant mice. Moreover, this protocol includes two facultative steps to erase the epigenetic "memory" of the donor cells and improve chromatin remodeling by histones modifications targeting.
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Affiliation(s)
- Vincent Brochard
- Université Paris-Saclay, INRAE, ENVA, BREED U1198, Jouy-en-Josas, France
| | - Nathalie Beaujean
- Université Paris-Saclay, INRAE, ENVA, BREED U1198, Jouy-en-Josas, France. .,Univ Lyon, Université Lyon 1, Inserm, INRAE, Stem Cell and Brain Research Institute U1208, USC 1361, Bron, France.
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Toralova T, Kinterova V, Chmelikova E, Kanka J. The neglected part of early embryonic development: maternal protein degradation. Cell Mol Life Sci 2020; 77:3177-3194. [PMID: 32095869 PMCID: PMC11104927 DOI: 10.1007/s00018-020-03482-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 01/24/2020] [Accepted: 02/07/2020] [Indexed: 12/28/2022]
Abstract
The degradation of maternally provided molecules is a very important process during early embryogenesis. However, the vast majority of studies deals with mRNA degradation and protein degradation is only a very little explored process yet. The aim of this article was to summarize current knowledge about the protein degradation during embryogenesis of mammals. In addition to resuming of known data concerning mammalian embryogenesis, we tried to fill the gaps in knowledge by comparison with facts known about protein degradation in early embryos of non-mammalian species. Maternal protein degradation seems to be driven by very strict rules in terms of specificity and timing. The degradation of some maternal proteins is certainly necessary for the normal course of embryonic genome activation (EGA) and several concrete proteins that need to be degraded before major EGA have been already found. Nevertheless, the most important period seems to take place even before preimplantation development-during oocyte maturation. The defects arisen during this period seems to be later irreparable.
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Affiliation(s)
- Tereza Toralova
- Laboratory of Developmental Biology, Institute of Animal Physiology and Genetics of the Czech Academy of Sciences, Libechov, Czech Republic
| | - Veronika Kinterova
- Laboratory of Developmental Biology, Institute of Animal Physiology and Genetics of the Czech Academy of Sciences, Libechov, Czech Republic.
- Department of Veterinary Sciences, Czech University of Life Sciences in Prague, Prague, Czech Republic.
| | - Eva Chmelikova
- Department of Veterinary Sciences, Czech University of Life Sciences in Prague, Prague, Czech Republic
| | - Jiri Kanka
- Laboratory of Developmental Biology, Institute of Animal Physiology and Genetics of the Czech Academy of Sciences, Libechov, Czech Republic
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4
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Liu HJ, Liu RM. Dynamic changes in chromatin and microtubules at the first cell cycle in SCNT or IVF goat embryos. Cell Biol Int 2018; 42:1401-1409. [PMID: 29993158 DOI: 10.1002/cbin.11031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/08/2018] [Indexed: 12/23/2022]
Abstract
We investigated the dynamic changes in chromatin and microtubules at the first cell cycle in goat somatic cell nuclear transfer (SCNT)-derived and in vitro fertilization (IVF)-derived embryos. Stage-dependent and characteristic changes to chromatin and microtubules occurred in SCNT-derived embryos at different times after activation. About half donor nuclei underwent premature chromosome condensation (PCC) at 1 h post activation, and furtherly reached telophase at 2 h after activation. However, we discovered that the separated chromosomes reaggregated, not keeping two independent nuclei; and formed one pronucleus at 2.5 h after activation. One pronucleus was found in all reconstructed oocytes except other no nucleus oocytes from 3 to 22 h after activation. Reconstructed oocytes reached the first mitotic metaphase at 23 h post activation, which was later than that of IVF-derived embryos at 16 h after insemination. SCNT-derived embryos showed significantly higher abnormalities in the first mitotic metaphase spindle, compared with IVF-derived embryos. Abnormal spindles included multi polar and half spindles. SCNT-derived embryos began to cleave at 24 h after activation, which was later than that of IVF-derived embryos at 21 h after insemination. SCNT-derived embryos showed delayed conversion from telophase to interphase than IVF-derived embryos during cleavage. These might lead to poor development in SCNT-derived embryos.
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Affiliation(s)
- Hai-Jun Liu
- Tianjin Institute of Animal Science and Veterinary Medicine, Tianjin, 300384, China
| | - Ru-Ming Liu
- College of Life Sciences, Nankai University, Tianjin, 300071, China
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Liu X, Luo C, Deng K, Wu Z, Wei Y, Jiang J, Lu F, Shi D. Cytoplasmic volume of recipient oocytes affects the nucleus reprogramming and the developmental competence of HMC buffalo (Bubalus bubalis) embryos. J Vet Med Sci 2018; 80:1291-1300. [PMID: 29925699 PMCID: PMC6115262 DOI: 10.1292/jvms.18-0043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The present study was undertaken to examine the effects of cytoplasmic volume on nucleus
reprogramming and developmental competence of buffalo handmade cloning (HMC) embryos. We
found that both HMC embryos derived from ~150% cytoplasm or ~225% cytoplasm resulted in a
higher blastocyst rate and total cell number of blastocyst in comparison with those from
~75% cytoplasm (25.4 ± 2.0, 27.9 ± 1.6% vs. 17.9 ± 3.1%; 150 ± 10, 169 ± 12 vs. 85 ± 6,
P<0.05). Meanwhile, the proportions of nuclear envelope breakdown
(NEBD) and premature chromosome condensation (PCC) were also increased in the embryos
derived from ~150 or ~225% enucleated cytoplasm compared to those from ~75% cytoplasm.
Moreover, HMC embryos derived from ~225% cytoplasm showed a decrease of global DNA
methylation from the 2-cell to the 4-cell stage in comparison with those of ~75% cytoplasm
(P<0.05). Furthermore, the expression of embryonic genome activation
(EGA) relative genes (eIF1A and U2AF) in HMC embryos
derived from ~225% cytoplasm at the 8-cell stages was also found to be enhanced compared
with that of the ~75% cytoplasm. Two of seven recipients were confirmed to be pregnant
following transfer of blastocysts derived from ~225% cytoplasm, and one healthy cloned
calf was delivered at the end of the gestation period, whereas no recipients were pregnant
after the transfer of blastocysts derived from ~75% cytoplasm. These results indicate that
the cytoplasmic volume of recipient oocytes affects donor nucleus reprogramming, and then
further accounted for the developmental ability of the reconstructed embryos.
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Affiliation(s)
- Xiaohua Liu
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Chan Luo
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Kai Deng
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Zhulian Wu
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Yingming Wei
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Jianrong Jiang
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Fenghua Lu
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
| | - Deshun Shi
- Guangxi High Education Key Laboratory for Animal Reproduction and Biotechnology, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530005, China
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6
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Effects of MG132 on the in vitro development and epigenetic modification of Debao porcine somatic cell nuclear transfer embryos. Theriogenology 2017; 94:48-58. [DOI: 10.1016/j.theriogenology.2017.02.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Revised: 12/30/2016] [Accepted: 02/03/2017] [Indexed: 01/12/2023]
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7
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Floyd ZE, Floyd EZ, Staszkiewicz J, Power RA, Kilroy G, Kirk-Ballard H, Barnes CW, Strickler KL, Rim JS, Harkins LL, Gao R, Kim J, Eilertsen KJ. Prolonged proteasome inhibition cyclically upregulates Oct3/4 and Nanog gene expression, but reduces induced pluripotent stem cell colony formation. Cell Reprogram 2015; 17:95-105. [PMID: 25826722 DOI: 10.1089/cell.2014.0030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
There is ample evidence that the ubiquitin-proteasome system is an important regulator of transcription and its activity is necessary for maintaining pluripotency and promoting cellular reprogramming. Moreover, proteasome activity contributes to maintaining the open chromatin structure found in pluripotent stem cells, acting as a transcriptional inhibitor at specific gene loci generally associated with differentiation. The current study was designed to understand further the role of proteasome inhibition in reprogramming and its ability to modulate endogenous expression of pluripotency-related genes and induced pluripotent stem cells (iPSCs) colony formation. Herein, we demonstrate that acute combinatorial treatment with the proteasome inhibitors MG101 or MG132 and the histone deacetylase (HDAC) inhibitor valproic acid (VPA) increases gene expression of the pluripotency marker Oct3/4, and that MG101 alone is as effective as VPA in the induction of Oct3/4 mRNA expression in fibroblasts. Prolonged proteasome inhibition cyclically upregulates gene expression of Oct3/4 and Nanog, but reduces colony formation in the presence of the iPSC induction cocktail. In conclusion, our results demonstrate that the 26S proteasome is an essential modulator in the reprogramming process. Its inhibition enhances expression of pluripotency-related genes; however, efficient colony formation requires proteasome activity. Therefore, discovery of small molecules that increase proteasome activity might lead to more efficient cell reprogramming and generation of pluripotent cells.
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Affiliation(s)
| | - Elizabeth Z Floyd
- 1 Ubiquitin Lab, Pennington Biomedical Research Center, Louisiana State University System , Baton Rouge, LA, 70803
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8
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Boulesteix C, Beaujean N. Fluorescent immunodetection of epigenetic modifications on preimplantation mouse embryos. Methods Mol Biol 2015; 1222:113-26. [PMID: 25287342 DOI: 10.1007/978-1-4939-1594-1_9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A common problem in research laboratories that study the mammalian embryo after nuclear transfer is the limited supply of material. For this reason, new methods are continually developed, and existing methods for cells in culture are adapted to suit this peculiar experimental model. Among them is the fluorescent immunodetection. Fluorescent immuno-detection on fixed embryos is an invaluable technique to detect and locate proteins, especially nuclear ones such as modified histones, in single embryos thanks to its specificity and its sensitivity. Moreover, with specific fixation procedures that preserve the 3D shape of the embryos, immunostaining can now be performed on whole-mount embryos. Target proteins are detected by specific binding of first antibody usually nonfluorescent, and revealed with a second antibody conjugated with a fluorochrome directed specifically against the host animal in which the first antibody was produced. The result can then be observed on a microscope equipped with fluorescent detection. Here, we describe the 3D fluorescent immunodetection of epigenetic modifications in mouse embryos. This procedure can be used on nuclear transferred embryos but also on in vivo-collected, in vitro-developed and in vitro-fertilized ones.
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Affiliation(s)
- Claire Boulesteix
- UMR1198 Biologie du Développement et Reproduction, INRA, Domaine de Vilvert, 78352, Jouy-en-Josas Cedex, France
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9
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Samiec M, Skrzyszowska M. Biological transcomplementary activation as a novel and effective strategy applied to the generation of porcine somatic cell cloned embryos. Reprod Biol 2014; 14:128-39. [PMID: 24856472 DOI: 10.1016/j.repbio.2013.12.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 12/23/2013] [Indexed: 11/26/2022]
Abstract
A novel method termed the biological transcomplementary activation (B-TCA) has been recently utilized for the stimulation of porcine oocytes reconstituted by somatic cell nuclear transfer (SCNT). The use of cytosolic components originating from fertilized (FE) rabbit zygotes as the stimuli for the B-TCA of SCNT-derived pig oocytes appeared to be a highly efficient strategy applied to promote the in vitro development of cloned embryos, leading to a significant improvement in the blastocyst yield (43.6%) compared to the yields achieved using the standard protocol of simultaneous fusion and electrical activation (SF-EA; [31.3%]) or the protocol of delayed electrical activation (D-EA) independent of extracellular Ca(2+) ions (0%). The FE rabbit zygote cytoplast-mediated B-TCA resulted in the increased blastocyst formation rate of porcine cloned embryos as compared to the B-TCA triggered by either cytoplasts isolated from pig parthenogenotes (PAs; [27.8%]) or rabbit PA-descended cytoplasts (0%). A considerably lower percentage of blastocysts containing apoptotic and/or necrotic (annexin V-eGFP-positive) cells were obtained from the SCNT-derived oocytes stimulated by the FE rabbit zygote cytoplast-based B-TCA (22.2%) compared to those stimulated using the SF-EA protocol (35.1%). In contrast to the B-TCA induced by FE rabbit zygote cytoplasts, apoptosis/necrosis incidence decreased totally among the cloned pig blastocysts that developed from reconstituted oocytes undergoing the porcine PA cytoplast-evoked B-TCA. In conclusion, the FE rabbit zygote cytoplast-mediated B-TCA turned out to be a relatively effective strategy for the in vitro production of porcine blastocyst clones of higher quality compared to those created using the standard SF-EA approach.
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Affiliation(s)
- Marcin Samiec
- Department of Biotechnology of Animal Reproduction, National Research Institute of Animal Production, Balice n. Cracow, Poland.
| | - Maria Skrzyszowska
- Department of Biotechnology of Animal Reproduction, National Research Institute of Animal Production, Balice n. Cracow, Poland
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10
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Ravi M, Nivedita K, Pai GM. Chromatin condensation dynamics and implications of induced premature chromosome condensation. Biochimie 2013; 95:124-33. [PMID: 23079335 DOI: 10.1016/j.biochi.2012.10.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022]
Abstract
Somatic cell cycle is a dynamic process with sequential events that culminate in cell division. Several physiological activities occur in the cytoplasm and nucleus during each of the cell cycle phases which help in doubling of genetic content, organized arrangement of the duplicated genetic material and perfect mechanism for its equal distribution to the two daughter cells formed. Also, the cell cycle checkpoints ensure that the genetic material is devoid of damages thus ensuring unaltered transmission of genetic information. Two important phenomena occurring during the cell cycle are the DNA condensation and decondensation cycles in the nucleus along with the cyclic expression and functioning of certain specific proteins that help in the same. Several protein families including Cyclins, cyclin dependent kinases, condensins, cohesins and surivins ensure error free, stage specific DNA condensation and decondensation by their highly specific, controlled orchestrated presence and action. Understanding the molecular mechanisms of chromatin compaction towards formation of the structural units, the chromosomes, give us valuable insights into the cellular physiology and also direct us to techniques such as premature chromosome condensation. The techniques of inducing 'prophasing' of interphase cells are undergoing rapid advances which have multidimensional applications for basic research and direct applications.
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Affiliation(s)
- Maddaly Ravi
- Department of Human Genetics, Faculty of Biomedical Sciences, Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
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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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12
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Update on the state of play of Animal Health and Welfare and Environmental Impact of Animals derived from SCNT Cloning and their Offspring, and Food Safety of Products Obtained from those Animals. EFSA J 2012. [DOI: 10.2903/j.efsa.2012.2794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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