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He J, Yan A, Chen B, Huang J, Kee K. 3D genome remodeling and homologous pairing during meiotic prophase of mouse oogenesis and spermatogenesis. Dev Cell 2023; 58:3009-3027.e6. [PMID: 37963468 DOI: 10.1016/j.devcel.2023.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 08/29/2023] [Accepted: 10/23/2023] [Indexed: 11/16/2023]
Abstract
During meiosis, the chromatin and transcriptome undergo prominent switches. Although recent studies have explored the genome reorganization during spermatogenesis, the chromatin remodeling in oogenesis and characteristics of homologous pairing remain largely elusive. We comprehensively compared chromatin structures and transcriptomes at successive substages of meiotic prophase in both female and male mice using low-input high-through chromosome conformation capture (Hi-C) and RNA sequencing (RNA-seq). Compartments and topologically associating domains (TADs) gradually disappeared and slowly recovered in both sexes. We found that homologs adopted different sex-conserved pairing strategies prior to and after the leptotene-to-zygotene transition, changing from long interspersed nuclear element (LINE)-enriched compartments B to short interspersed nuclear element (SINE)-enriched compartments A. We complemented marker genes and predicted the sex-specific meiotic sterile genes for each substage. This study provides valuable insights into the similarities and distinctions between sexes in chromosome architecture, homologous pairing, and transcriptome during meiotic prophase of both oogenesis and spermatogenesis.
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Affiliation(s)
- Jing He
- The State Key Laboratory for Complex, Severe, and Rare Diseases, Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China; SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China
| | - An Yan
- The State Key Laboratory for Complex, Severe, and Rare Diseases, Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China; SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China
| | - Bo Chen
- The State Key Laboratory for Complex, Severe, and Rare Diseases, Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China; SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China
| | - Jiahui Huang
- The State Key Laboratory for Complex, Severe, and Rare Diseases, Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China; SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China
| | - Kehkooi Kee
- The State Key Laboratory for Complex, Severe, and Rare Diseases, Center for Stem Cell Biology and Regenerative Medicine, Department of Basic Medical Sciences, School of Medicine, Tsinghua University, Beijing, China; SXMU-Tsinghua Collaborative Innovation Center for Frontier Medicine, School of Medicine, Tsinghua University, Beijing, China.
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2
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Gyobu‐Motani S, Yabuta Y, Mizuta K, Katou Y, Okamoto I, Kawasaki M, Kitamura A, Tsukiyama T, Iwatani C, Tsuchiya H, Tsujimura T, Yamamoto T, Nakamura T, Saitou M. Induction of fetal meiotic oocytes from embryonic stem cells in cynomolgus monkeys. EMBO J 2023; 42:e112962. [PMID: 36929479 PMCID: PMC10152148 DOI: 10.15252/embj.2022112962] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 02/09/2023] [Accepted: 02/10/2023] [Indexed: 03/18/2023] Open
Abstract
Human in vitro oogenesis provides a framework for clarifying the mechanism of human oogenesis. To create its benchmark, it is vital to promote in vitro oogenesis using a model physiologically close to humans. Here, we establish a foundation for in vitro oogenesis in cynomolgus (cy) monkeys (Macaca fascicularis): cy female embryonic stem cells harboring one active and one inactive X chromosome (Xa and Xi, respectively) differentiate robustly into primordial germ cell-like cells, which in xenogeneic reconstituted ovaries develop efficiently into oogonia and, remarkably, further into meiotic oocytes at the zygotene stage. This differentiation entails comprehensive epigenetic reprogramming, including Xi reprogramming, yet Xa and Xi remain epigenetically asymmetric with, as partly observed in vivo, incomplete Xi reactivation. In humans and monkeys, the Xi epigenome in pluripotent stem cells functions as an Xi-reprogramming determinant. We further show that developmental pathway over-activations with suboptimal up-regulation of relevant meiotic genes impede in vitro meiotic progression. Cy in vitro oogenesis exhibits critical homology with the human system, including with respect to bottlenecks, providing a salient model for advancing human in vitro oogenesis.
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Affiliation(s)
- Sayuri Gyobu‐Motani
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Yukihiro Yabuta
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Ken Mizuta
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Yoshitaka Katou
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Ikuhiro Okamoto
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Masanori Kawasaki
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Ayaka Kitamura
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
| | - Tomoyuki Tsukiyama
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Research Center for Animal Life ScienceShiga University of Medical ScienceOtsuJapan
| | - Chizuru Iwatani
- Research Center for Animal Life ScienceShiga University of Medical ScienceOtsuJapan
| | - Hideaki Tsuchiya
- Research Center for Animal Life ScienceShiga University of Medical ScienceOtsuJapan
| | - Taro Tsujimura
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
| | - Takuya Yamamoto
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Center for iPS Cell Research and Application (CiRA)Kyoto UniversityKyotoJapan
- Center for Advanced Intelligence Project, RIKENTokyoJapan
| | - Tomonori Nakamura
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
- The Hakubi Center for Advanced ResearchKyoto UniversityKyotoJapan
| | - Mitinori Saitou
- Institute for the Advanced Study of Human Biology (WPI‐ASHBi)Kyoto UniversityKyotoJapan
- Department of Anatomy and Cell Biology, Graduate School of MedicineKyoto UniversityKyotoJapan
- Center for iPS Cell Research and Application (CiRA)Kyoto UniversityKyotoJapan
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3
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Mizuta K, Katou Y, Nakakita B, Kishine A, Nosaka Y, Saito S, Iwatani C, Tsuchiya H, Kawamoto I, Nakaya M, Tsukiyama T, Nagano M, Kojima Y, Nakamura T, Yabuta Y, Horie A, Mandai M, Ohta H, Saitou M. Ex vivo reconstitution of fetal oocyte development in humans and cynomolgus monkeys. EMBO J 2022; 41:e110815. [PMID: 35912849 PMCID: PMC9475534 DOI: 10.15252/embj.2022110815] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 06/28/2022] [Accepted: 06/29/2022] [Indexed: 12/14/2022] Open
Abstract
In vitro oogenesis is key to elucidating the mechanism of human female germ-cell development and its anomalies. Accordingly, pluripotent stem cells have been induced into primordial germ cell-like cells and into oogonia with epigenetic reprogramming, yet further reconstitutions remain a challenge. Here, we demonstrate ex vivo reconstitution of fetal oocyte development in both humans and cynomolgus monkeys (Macaca fascicularis). With an optimized culture of fetal ovary reaggregates over three months, human and monkey oogonia enter and complete the first meiotic prophase to differentiate into diplotene oocytes that form primordial follicles, the source for oogenesis in adults. The cytological and transcriptomic progressions of fetal oocyte development in vitro closely recapitulate those in vivo. A comparison of single-cell transcriptomes among humans, monkeys, and mice unravels primate-specific and conserved programs driving fetal oocyte development, the former including a distinct transcriptomic transformation upon oogonia-to-oocyte transition and the latter including two active X chromosomes with little X-chromosome upregulation. Our study provides a critical step forward for realizing human in vitro oogenesis and uncovers salient characteristics of fetal oocyte development in primates.
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Affiliation(s)
- Ken Mizuta
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yoshitaka Katou
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Baku Nakakita
- Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Department of Gynecology and Obstetrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Aoi Kishine
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yoshiaki Nosaka
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Saki Saito
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Chizuru Iwatani
- Research Center for Animal Life Science, Shiga University of Medical Science, Otsu, Japan
| | - Hideaki Tsuchiya
- Research Center for Animal Life Science, Shiga University of Medical Science, Otsu, Japan
| | - Ikuo Kawamoto
- Research Center for Animal Life Science, Shiga University of Medical Science, Otsu, Japan
| | - Masataka Nakaya
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Research Center for Animal Life Science, Shiga University of Medical Science, Otsu, Japan
| | - Tomoyuki Tsukiyama
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Research Center for Animal Life Science, Shiga University of Medical Science, Otsu, Japan
| | - Masahiro Nagano
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yoji Kojima
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan
| | - Tomonori Nakamura
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,The Hakubi Center for Advanced Research, Kyoto University, Kyoto, Japan
| | - Yukihiro Yabuta
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akihito Horie
- Department of Gynecology and Obstetrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Masaki Mandai
- Department of Gynecology and Obstetrics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiroshi Ohta
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Mitinori Saitou
- Institute for the Advanced Study of Human Biology (ASHBi), Kyoto University, Kyoto, Japan.,Department of Anatomy and Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Center for iPS Cell Research and Application (CiRA), Kyoto University, Kyoto, Japan
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4
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Wang Y, Gao WY, Wang LL, Wang RL, Yang ZX, Luo FQ, He YH, Wang ZB, Wang FQ, Sun QY, Li J, Zhang D. FBXW24 controls female meiotic prophase progression by regulating SYCP3 ubiquitination. Clin Transl Med 2022; 12:e891. [PMID: 35858239 PMCID: PMC9299759 DOI: 10.1002/ctm2.891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 04/29/2022] [Accepted: 05/05/2022] [Indexed: 11/12/2022] Open
Abstract
Background An impeccable female meiotic prophase is critical for producing a high‐quality oocyte and, ultimately, a healthy newborn. SYCP3 is a key component of the synaptonemal complex regulating meiotic homologous recombination. However, what regulates SYCP3 stability is unknown. Methods Fertility assays, follicle counting, meiotic prophase stage (leptotene, zygotene, pachytene and diplotene) analysis and live imaging were employed to examine how FBXW24 knockout (KO) affect female fertility, follicle reserve, oocyte quality, meiotic prophase progression of female germ cells, and meiosis of oocytes. Western blot and immunostaining were used to examined the levels & signals (intensity, foci) of SYCP3 and multiple key DSB indicators & repair proteins (γH2AX, RPA2, p‐CHK2, RAD51, MLH1, HORMAD1, TRIP13) after FBXW24 KO. Co‐IP and immuno‐EM were used to examined the interaction between FBXW24 and SYCP3; Mass spec was used to characterize the ubiquitination sites in SYCP3; In vivo & in vitro ubiquitination assays were utilized to determine the key sites in SYCP3 & FBXW24 for ubiquitination. Results Fbxw24‐knockout (KO) female mice were infertile due to massive oocyte death upon meiosis entry. Fbxw24‐KO oocytes were defective due to elevated DNA double‐strand breaks (DSBs) and inseparable homologous chromosomes. Fbxw24‐KO germ cells showed increased SYCP3 levels, delayed prophase progression, increased DSBs, and decreased crossover foci. Next, we found that FBXW24 directly binds and ubiquitinates SYCP3 to regulate its stability. In addition, several key residues important for SYCP3 ubiquitination and FBXW24 ubiquitinating activity were characterized. Conclusions We proposed that FBXW24 regulates the timely degradation of SYCP3 to ensure normal crossover and DSB repair during pachytene. FBXW24‐KO delayed SYCP3 degradation and DSB repair from pachytene until metaphase II (MII), ultimately causing failure in oocyte maturation, oocyte death, and infertility.
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Affiliation(s)
- Yang Wang
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Wen-Yi Gao
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Li-Li Wang
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Ruo-Lei Wang
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Zhi-Xia Yang
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Fu-Qiang Luo
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Yu-Hao He
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Zi-Bin Wang
- Analysis and Test Center, Nanjing Medical University, Nanjing, China
| | - Fu-Qiang Wang
- Fertility Preservation Lab and Guangdong-Hong Kong Metabolism & Reproduction Joint Laboratory, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, China
| | - Qing-Yuan Sun
- Fertility Preservation Lab and Guangdong-Hong Kong Metabolism & Reproduction Joint Laboratory, Reproductive Medicine Center, Guangdong Second Provincial General Hospital, Guangzhou, China
| | - Jing Li
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Dong Zhang
- State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China.,Animal Core Facility, Nanjing Medical University, Nanjing, P. R. China
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Abstract
A central player in meiotic chromosome dynamics is the conserved Polo-like kinase (PLK) family. PLKs are dynamically localized to distinct structures during meiotic prophase and phosphorylate a diverse group of substrates to control homolog pairing, synapsis, and meiotic recombination. In a recent study, we uncovered the mechanisms that control the targeting of a meiosis-specific PLK-2 in C. elegans. In early meiotic prophase, PLK-2 localizes to special chromosome regions known as pairing centers and drives homolog pairing and synapsis. PLK-2 then relocates to the synaptonemal complex (SC) after crossover designation and mediates chromosome remodeling required for homolog separation. What controls this intricate targeting of PLK-2 in space and time? We discuss recent findings and remaining questions for the future.
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Affiliation(s)
| | - Yumi Kim
- Department of Biology, Johns Hopkins University, Baltimore, MD
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6
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Abstract
Molecular studies of meiosis in mammals have been long relegated due to some intrinsic obstacles, namely the impossibility to reproduce the process in vitro, and the difficulty to obtain highly pure isolated cells of the different meiotic stages. In the recent years, some technical advances, from the improvement of flow cytometry sorting protocols to single-cell RNAseq, are enabling to profile the transcriptome and its fluctuations along the meiotic process. In this mini-review we will outline the diverse methodological approaches that have been employed, and some of the main findings that have started to arise from these studies. As for practical reasons most studies have been carried out in males, and mostly using mouse as a model, our focus will be on murine male meiosis, although also including specific comments about humans. Particularly, we will center on the controversy about gene expression during early meiotic prophase; the widespread existing gap between transcription and translation in meiotic cells; the expression patterns and potential roles of meiotic long non-coding RNAs; and the visualization of meiotic sex chromosome inactivation from the RNAseq perspective.
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Affiliation(s)
- Adriana Geisinger
- Biochemistry-Molecular Biology, Facultad de Ciencias, Universidad de la República (UdelaR), Montevideo, Uruguay.,Department of Molecular Biology, Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Montevideo, Uruguay
| | - Rosana Rodríguez-Casuriaga
- Department of Molecular Biology, Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Montevideo, Uruguay
| | - Ricardo Benavente
- Department of Cell and Developmental Biology, Biocenter, University of Würzburg, Würzburg, Germany
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López-Moncada F, Tapia D, Zuñiga N, Ayarza E, López-Fenner J, Redi CA, Berríos S. Nucleolar Expression and Chromosomal Associations in Robertsonian Spermatocytes of Mus musculus domesticus. Genes (Basel) 2019; 10:E120. [PMID: 30736350 DOI: 10.3390/genes10020120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/01/2019] [Accepted: 02/05/2019] [Indexed: 02/08/2023] Open
Abstract
We studied and compared the nucleolar expression or nucleoli from specific bivalents in spermatocytes of the standard Mus musculus domesticus 2n=40, of Robertsonian (Rb) homozygotes 2n = 24 and heterozygotes 2n = 32. We analyzed 200 nuclear microspreads of each specific nucleolar chromosome and spermatocyte karyotype, using FISH to identify specific nucleolar bivalents, immunofluorescence for both fibrillarin of the nucleolus and the synaptonemal complex of the bivalents, and DAPI for heterochromatin. There was nucleolar expression in all the chromosomal conditions studied. By specific nucleolar bivalent, the quantitative relative nucleolar expression was higher in the bivalent 12 than in its derivatives, lower in the bivalent 15 than in its derivatives and higher in the bivalent 16 than its Rb derivatives. In the interactions between non-homologous chromosomal domains, the nucleolar bivalents were preferentially associated through pericentromeric heterochromatin with other bivalents of similar morphology and sometimes with other nucleolar bivalents. We suggest that the nucleolar expression in Rb nucleolar chromosomes is modified as a consequence of different localization of ribosomal genes (NOR) in the Rb chromosomes, its proximity to heterochromatin and its associations with chromosomes of the same morphology.
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Chacón MR, Delivani P, Tolić IM. Meiotic Nuclear Oscillations Are Necessary to Avoid Excessive Chromosome Associations. Cell Rep 2017; 17:1632-1645. [PMID: 27806301 DOI: 10.1016/j.celrep.2016.10.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 07/26/2016] [Accepted: 10/04/2016] [Indexed: 10/20/2022] Open
Abstract
Pairing of homologous chromosomes is a crucial step in meiosis, which in fission yeast depends on nuclear oscillations. However, how nuclear oscillations help pairing is unknown. Here, we show that homologous loci typically pair when the spindle pole body is at the cell pole and the nucleus is elongated, whereas they unpair when the spindle pole body is in the cell center and the nucleus is round. Inhibition of oscillations demonstrated that movement is required for initial pairing and that prolonged association of loci leads to mis-segregation. The double-strand break marker Rec25 accumulates in elongated nuclei, indicating that prolonged chromosome stretching triggers recombinatory pathways leading to mis-segregation. Mis-segregation is rescued by overexpression of the Holliday junction resolvase Mus81, suggesting that prolonged pairing results in irresolvable recombination intermediates. We conclude that nuclear oscillations exhibit a dual role, promoting initial pairing and restricting the time of chromosome associations to ensure proper segregation.
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Affiliation(s)
- Mariola R Chacón
- Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
| | - Petrina Delivani
- Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany
| | - Iva M Tolić
- Max Planck Institute of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany; Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia.
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9
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Affiliation(s)
- Hui-Ju Yang
- a Graduate School of Frontier Biosciences, Osaka University , Suita , Japan
| | - Tokuko Haraguchi
- a Graduate School of Frontier Biosciences, Osaka University , Suita , Japan.,b Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology , Kobe , Japan
| | - Yasushi Hiraoka
- a Graduate School of Frontier Biosciences, Osaka University , Suita , Japan.,b Advanced ICT Research Institute Kobe, National Institute of Information and Communications Technology , Kobe , Japan
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