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Dash S, Joshi S, Pankajam AV, Shinohara A, Nishant KT. Heterozygosity alters Msh5 binding to meiotic chromosomes in the baker's yeast. Genetics 2024; 226:iyad214. [PMID: 38124392 DOI: 10.1093/genetics/iyad214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/11/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
Meiotic crossovers are initiated from programmed DNA double-strand breaks. The Msh4-Msh5 heterodimer is an evolutionarily conserved mismatch repair-related protein complex that promotes meiotic crossovers by stabilizing strand invasion intermediates and joint molecule structures such as Holliday junctions. In vivo studies using homozygous strains of the baker's yeast Saccharomyces cerevisiae (SK1) show that the Msh4-Msh5 complex associates with double-strand break hotspots, chromosome axes, and centromeres. Many organisms have heterozygous genomes that can affect the stability of strand invasion intermediates through heteroduplex rejection of mismatch-containing sequences. To examine Msh4-Msh5 function in a heterozygous context, we performed chromatin immunoprecipitation and sequencing (ChIP-seq) analysis in a rapidly sporulating hybrid S. cerevisiae strain (S288c-sp/YJM789, containing sporulation-enhancing QTLs from SK1), using SNP information to distinguish reads from homologous chromosomes. Overall, Msh5 localization in this hybrid strain was similar to that determined in the homozygous strain (SK1). However, relative Msh5 levels were reduced in regions of high heterozygosity, suggesting that high mismatch densities reduce levels of recombination intermediates to which Msh4-Msh5 binds. Msh5 peaks were also wider in the hybrid background compared to the homozygous strain (SK1). We determined regions containing heteroduplex DNA by detecting chimeric sequence reads with SNPs from both parents. Msh5-bound double-strand break hotspots overlap with regions that have chimeric DNA, consistent with Msh5 binding to heteroduplex-containing recombination intermediates.
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Affiliation(s)
- Suman Dash
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Trivandrum 695551, India
| | - Sameer Joshi
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Trivandrum 695551, India
| | - Ajith V Pankajam
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Trivandrum 695551, India
| | - Akira Shinohara
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan
| | - Koodali T Nishant
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Trivandrum 695551, India
- Center for High-Performance Computing, Indian Institute of Science Education and Research Thiruvananthapuram, Trivandrum 695551, India
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2
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Börner GV, Hochwagen A, MacQueen AJ. Meiosis in budding yeast. Genetics 2023; 225:iyad125. [PMID: 37616582 PMCID: PMC10550323 DOI: 10.1093/genetics/iyad125] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 06/13/2023] [Indexed: 08/26/2023] Open
Abstract
Meiosis is a specialized cell division program that is essential for sexual reproduction. The two meiotic divisions reduce chromosome number by half, typically generating haploid genomes that are packaged into gametes. To achieve this ploidy reduction, meiosis relies on highly unusual chromosomal processes including the pairing of homologous chromosomes, assembly of the synaptonemal complex, programmed formation of DNA breaks followed by their processing into crossovers, and the segregation of homologous chromosomes during the first meiotic division. These processes are embedded in a carefully orchestrated cell differentiation program with multiple interdependencies between DNA metabolism, chromosome morphogenesis, and waves of gene expression that together ensure the correct number of chromosomes is delivered to the next generation. Studies in the budding yeast Saccharomyces cerevisiae have established essentially all fundamental paradigms of meiosis-specific chromosome metabolism and have uncovered components and molecular mechanisms that underlie these conserved processes. Here, we provide an overview of all stages of meiosis in this key model system and highlight how basic mechanisms of genome stability, chromosome architecture, and cell cycle control have been adapted to achieve the unique outcome of meiosis.
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Affiliation(s)
- G Valentin Börner
- Center for Gene Regulation in Health and Disease (GRHD), Department of Biological, Geological and Environmental Sciences, Cleveland State University, Cleveland, OH 44115, USA
| | | | - Amy J MacQueen
- Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, CT 06459, USA
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3
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Abstract
In meiosis, homologous chromosome synapsis is mediated by a supramolecular protein structure, the synaptonemal complex (SC), that assembles between homologous chromosome axes. The mammalian SC comprises at least eight largely coiled-coil proteins that interact and self-assemble to generate a long, zipper-like structure that holds homologous chromosomes in close proximity and promotes the formation of genetic crossovers and accurate meiotic chromosome segregation. In recent years, numerous mutations in human SC genes have been associated with different types of male and female infertility. Here, we integrate structural information on the human SC with mouse and human genetics to describe the molecular mechanisms by which SC mutations can result in human infertility. We outline certain themes in which different SC proteins are susceptible to different types of disease mutation and how genetic variants with seemingly minor effects on SC proteins may act as dominant-negative mutations in which the heterozygous state is pathogenic.
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Affiliation(s)
- Ian R Adams
- Medical Research Council (MRC) Human Genetics Unit, MRC Institute of Genetics and Cancer, University of Edinburgh, Edinburgh, United Kingdom;
| | - Owen R Davies
- Wellcome Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh, Edinburgh, United Kingdom;
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4
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Dutreux F, Dutta A, Peltier E, Bibi-Triki S, Friedrich A, Llorente B, Schacherer J. Lessons from the meiotic recombination landscape of the ZMM deficient budding yeast Lachancea waltii. PLoS Genet 2023; 19:e1010592. [PMID: 36608114 PMCID: PMC9851511 DOI: 10.1371/journal.pgen.1010592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 01/19/2023] [Accepted: 12/22/2022] [Indexed: 01/09/2023] Open
Abstract
Meiotic recombination is a driving force for genome evolution, deeply characterized in a few model species, notably in the budding yeast Saccharomyces cerevisiae. Interestingly, Zip2, Zip3, Zip4, Spo16, Msh4, and Msh5, members of the so-called ZMM pathway that implements the interfering meiotic crossover pathway in S. cerevisiae, have been lost in Lachancea yeast species after the divergence of Lachancea kluyveri from the rest of the clade. In this context, after investigating meiosis in L. kluyveri, we determined the meiotic recombination landscape of Lachancea waltii. Attempts to generate diploid strains with fully hybrid genomes invariably resulted in strains with frequent whole-chromosome aneuploidy and multiple extended regions of loss of heterozygosity (LOH), which mechanistic origin is so far unclear. Despite the lack of multiple ZMM pro-crossover factors in L. waltii, numbers of crossovers and noncrossovers per meiosis were higher than in L. kluyveri but lower than in S. cerevisiae, for comparable genome sizes. Similar to L. kluyveri but opposite to S. cerevisiae, L. waltii exhibits an elevated frequency of zero-crossover bivalents. Lengths of gene conversion tracts for both crossovers and non-crossovers in L. waltii were comparable to those observed in S. cerevisiae and shorter than in L. kluyveri despite the lack of Mlh2, a factor limiting conversion tract size in S. cerevisiae. L. waltii recombination hotspots were not shared with either S. cerevisiae or L. kluyveri, showing that meiotic recombination hotspots can evolve at a rather limited evolutionary scale within budding yeasts. Finally, L. waltii crossover interference was reduced relative to S. cerevisiae, with interference being detected only in the 25 kb distance range. Detection of positive inference only at short distance scales in the absence of multiple ZMM factors required for interference-sensitive crossovers in other systems likely reflects interference between early recombination precursors such as DSBs.
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Affiliation(s)
- Fabien Dutreux
- Université de Strasbourg, CNRS, GMGM UMR 7156, Strasbourg, France
| | - Abhishek Dutta
- Université de Strasbourg, CNRS, GMGM UMR 7156, Strasbourg, France
| | - Emilien Peltier
- Université de Strasbourg, CNRS, GMGM UMR 7156, Strasbourg, France
| | | | - Anne Friedrich
- Université de Strasbourg, CNRS, GMGM UMR 7156, Strasbourg, France
| | - Bertrand Llorente
- CNRS UMR7258, INSERM U1068, Aix Marseille Université UM105, Institut Paoli-Calmettes, CRCM, Marseille, France,* E-mail: (BL); (JS)
| | - Joseph Schacherer
- Université de Strasbourg, CNRS, GMGM UMR 7156, Strasbourg, France,Institut Universitaire de France (IUF), Paris, France,* E-mail: (BL); (JS)
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5
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Ito M, Shinohara A. Chromosome architecture and homologous recombination in meiosis. Front Cell Dev Biol 2023; 10:1097446. [PMID: 36684419 PMCID: PMC9853400 DOI: 10.3389/fcell.2022.1097446] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 12/22/2022] [Indexed: 01/09/2023] Open
Abstract
Meiocytes organize higher-order chromosome structures comprising arrays of chromatin loops organized at their bases by linear axes. As meiotic prophase progresses, the axes of homologous chromosomes align and synapse along their lengths to form ladder-like structures called synaptonemal complexes (SCs). The entire process of meiotic recombination, from initiation via programmed DNA double-strand breaks (DSBs) to completion of DSB repair with crossover or non-crossover outcomes, occurs in the context of chromosome axes and SCs. These meiosis-specific chromosome structures provide specialized environments for the regulation of DSB formation and crossing over. In this review, we summarize insights into the importance of chromosome architecture in the regulation of meiotic recombination, focusing on cohesin-mediated axis formation, DSB regulation via tethered loop-axis complexes, inter-homolog template bias facilitated by axial proteins, and crossover regulation in the context of the SCs. We also discuss emerging evidence that the SUMO and the ubiquitin-proteasome system function in the organization of chromosome structure and regulation of meiotic recombination.
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Affiliation(s)
- Masaru Ito
- *Correspondence: Masaru Ito, ; Akira Shinohara,
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6
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Joint control of meiotic crossover patterning by the synaptonemal complex and HEI10 dosage. Nat Commun 2022; 13:5999. [PMID: 36224180 PMCID: PMC9556546 DOI: 10.1038/s41467-022-33472-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 09/19/2022] [Indexed: 11/09/2022] Open
Abstract
Meiotic crossovers are limited in number and are prevented from occurring close to each other by crossover interference. In many species, crossover number is subject to sexual dimorphism, and a lower crossover number is associated with shorter chromosome axes lengths. How this patterning is imposed remains poorly understood. Here, we show that overexpression of the Arabidopsis pro-crossover protein HEI10 increases crossovers but maintains some interference and sexual dimorphism. Disrupting the synaptonemal complex by mutating ZYP1 also leads to an increase in crossovers but, in contrast, abolishes interference and disrupts the link between chromosome axis length and crossovers. Crucially, combining HEI10 overexpression and zyp1 mutation leads to a massive and unprecedented increase in crossovers. These observations support and can be predicted by, a recently proposed model in which HEI10 diffusion along the synaptonemal complex drives a coarsening process leading to well-spaced crossover-promoting foci, providing a mechanism for crossover patterning. During meiosis, the number and distribution of crossovers (COs) are tightly controlled, but the mechanistic basis of this control is unclear. Here, by combining experimental data and mathematical modeling, the study advocates a CO patterning model via coarsening through the diffusion of HEI10 along the synaptonemal complex.
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7
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Chigweshe L, MacQueen AJ, Holmes SG. Histone variant H2A.Z promotes meiotic chromosome axis organization in Saccharomyces cerevisiae. G3 GENES|GENOMES|GENETICS 2022; 12:6591205. [PMID: 35608312 PMCID: PMC9339299 DOI: 10.1093/g3journal/jkac128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 05/07/2022] [Indexed: 11/14/2022]
Abstract
Progression through meiosis is associated with significant reorganization of chromosome structure, regulated in part by changes in histones and chromatin. Prior studies observed defects in meiotic progression in yeast strains lacking the linker histone H1 or variant histone H2A.Z. To further define the contributions of these chromatin factors, we have conducted genetic and cytological analysis of cells undergoing meiosis in the absence of H1 and H2A.Z. We find that a spore viability defect observed in strains lacking H2A.Z can be partially suppressed if cells also lack histone H1, while the combined loss of both H1 and H2A.Z is associated with elevated gene conversion events. Cytological analysis of Red1 and Rec8 staining patterns indicates that a subset of cells lacking H2A.Z fail to assemble a proper chromosome axis, and the staining pattern of the synaptonemal complex protein Zip1 in htz1Δ/htz1Δ cells mimics that of cells deficient for Rec8-dependent meiotic cohesion. Our results suggest a role for H2A.Z in the establishment or maintenance of the meiotic chromosome axis, possibly by promoting the efficient chromosome cohesion.
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Affiliation(s)
- Lorencia Chigweshe
- Department of Molecular Biology and Biochemistry, Wesleyan University , Middletown, CT 06459, USA
| | - Amy J MacQueen
- Department of Molecular Biology and Biochemistry, Wesleyan University , Middletown, CT 06459, USA
| | - Scott G Holmes
- Department of Molecular Biology and Biochemistry, Wesleyan University , Middletown, CT 06459, USA
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8
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Jo MK, Rhee K, Kim KP, Hong S. Yeast polyubiquitin unit regulates synaptonemal complex formation and recombination during meiosis. J Microbiol 2022; 60:705-714. [DOI: 10.1007/s12275-022-2204-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 10/17/2022]
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9
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Voelkel-Meiman K, Oke A, Feil A, Shames A, Fung J, MacQueen AJ. A role for synaptonemal complex in meiotic mismatch repair. Genetics 2022; 220:iyab230. [PMID: 35100397 PMCID: PMC9097268 DOI: 10.1093/genetics/iyab230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/17/2021] [Indexed: 11/14/2022] Open
Abstract
A large subset of meiotic recombination intermediates form within the physical context of synaptonemal complex (SC), but the functional relationship between SC structure and homologous recombination remains obscure. Our prior analysis of strains deficient for SC central element proteins demonstrated that tripartite SC is dispensable for interhomolog recombination in Saccharomyces cerevisiae. Here, we report that while dispensable for recombination per se, SC proteins promote efficient mismatch repair at interhomolog recombination sites. Failure to repair mismatches within heteroduplex-containing meiotic recombination intermediates leads to genotypically sectored colonies (postmeiotic segregation events). We discovered increased postmeiotic segregation at THR1 in cells lacking Ecm11 or Gmc2, or in the SC-deficient but recombination-proficient zip1[Δ21-163] mutant. High-throughput sequencing of octad meiotic products furthermore revealed a genome-wide increase in recombination events with unrepaired mismatches in ecm11 mutants relative to wildtype. Meiotic cells missing Ecm11 display longer gene conversion tracts, but tract length alone does not account for the higher frequency of unrepaired mismatches. Interestingly, the per-nucleotide mismatch frequency is elevated in ecm11 when analyzing all gene conversion tracts, but is similar between wildtype and ecm11 if considering only those events with unrepaired mismatches. Thus, in both wildtype and ecm11 strains a subset of recombination events is susceptible to a similar degree of inefficient mismatch repair, but in ecm11 mutants a larger fraction of events fall into this inefficient repair category. Finally, we observe elevated postmeiotic segregation at THR1 in mutants with a dual deficiency in MutSγ crossover recombination and SC assembly, but not in the mlh3 mutant, which lacks MutSγ crossovers but has abundant SC. We propose that SC structure promotes efficient mismatch repair of joint molecule recombination intermediates, and that absence of SC is the molecular basis for elevated postmeiotic segregation in both MutSγ crossover-proficient (ecm11, gmc2) and MutSγ crossover-deficient (msh4, zip3) strains.
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Affiliation(s)
- Karen Voelkel-Meiman
- Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, CT 06459, USA
| | - Ashwini Oke
- Department of Obstetrics, Gynecology and Reproductive Sciences, Center of Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Arden Feil
- Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, CT 06459, USA
| | - Alexander Shames
- Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, CT 06459, USA
| | - Jennifer Fung
- Department of Obstetrics, Gynecology and Reproductive Sciences, Center of Reproductive Sciences, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Amy J MacQueen
- Department of Molecular Biology and Biochemistry, Wesleyan University, Middletown, CT 06459, USA
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10
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Pyatnitskaya A, Andreani J, Guérois R, De Muyt A, Borde V. The Zip4 protein directly couples meiotic crossover formation to synaptonemal complex assembly. Genes Dev 2022; 36:53-69. [PMID: 34969823 PMCID: PMC8763056 DOI: 10.1101/gad.348973.121] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 12/08/2021] [Indexed: 11/24/2022]
Abstract
Meiotic recombination is triggered by programmed double-strand breaks (DSBs), a subset of these being repaired as crossovers, promoted by eight evolutionarily conserved proteins, named ZMM. Crossover formation is functionally linked to synaptonemal complex (SC) assembly between homologous chromosomes, but the underlying mechanism is unknown. Here we show that Ecm11, a SC central element protein, localizes on both DSB sites and sites that attach chromatin loops to the chromosome axis, which are the starting points of SC formation, in a way that strictly requires the ZMM protein Zip4. Furthermore, Zip4 directly interacts with Ecm11, and point mutants that specifically abolish this interaction lose Ecm11 binding to chromosomes and exhibit defective SC assembly. This can be partially rescued by artificially tethering interaction-defective Ecm11 to Zip4. Mechanistically, this direct connection ensuring SC assembly from CO sites could be a way for the meiotic cell to shut down further DSB formation once enough recombination sites have been selected for crossovers, thereby preventing excess crossovers. Finally, the mammalian ortholog of Zip4, TEX11, also interacts with the SC central element TEX12, suggesting a general mechanism.
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Affiliation(s)
- Alexandra Pyatnitskaya
- Institut Curie, Université Paris Sciences et Lettres, Sorbonne Université, Dynamics of Genetic Information, UMR3244, Centre National de la Recherche Scientifique (CNRS), Paris 75248, France
| | - Jessica Andreani
- Université Paris-Saclay, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette 91198, France
| | - Raphaël Guérois
- Université Paris-Saclay, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette 91198, France
| | - Arnaud De Muyt
- Institut Curie, Université Paris Sciences et Lettres, Sorbonne Université, Dynamics of Genetic Information, UMR3244, Centre National de la Recherche Scientifique (CNRS), Paris 75248, France
| | - Valérie Borde
- Institut Curie, Université Paris Sciences et Lettres, Sorbonne Université, Dynamics of Genetic Information, UMR3244, Centre National de la Recherche Scientifique (CNRS), Paris 75248, France
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11
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Abstract
In this Outlook, Grey and de Massy discuss a study by Pyatnitskaya et al. in this issue of Genes & Development that highlights the central role of the Saccharomyces cerevisiae ZMM protein Zip4 in how crossover formation and synapsis initiation are linked. During meiosis, a molecular program induces DNA double-strand breaks (DSBs) and their repair by homologous recombination. DSBs can be repaired with or without crossovers. ZMM proteins promote the repair toward crossover. The sites of DSB repair are also sites where the axes of homologous chromosomes are juxtaposed and stabilized, and where a structure called the synaptonemal complex initiates, providing further regulation of both DSB formation and repair. How crossover formation and synapsis initiation are linked has remained unknown. The study by Pyatnitskaya and colleagues (pp. 53–69) in this issue of Genes & Development highlights the central role of the Saccharomyces cerevisiae ZMM protein Zip4 in this process.
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Affiliation(s)
- Corinne Grey
- Institut de Génétique Humaine (IGH), Centre National de la Recherche Scientifique, Université Montpellier, Montpellier 34396, France
| | - Bernard de Massy
- Institut de Génétique Humaine (IGH), Centre National de la Recherche Scientifique, Université Montpellier, Montpellier 34396, France
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12
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The synaptonemal complex imposes crossover interference and heterochiasmy in Arabidopsis. Proc Natl Acad Sci U S A 2021; 118:2023613118. [PMID: 33723072 PMCID: PMC8000504 DOI: 10.1073/pnas.2023613118] [Citation(s) in RCA: 87] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Meiotic recombination promotes genetic diversity by shuffling parental chromosomes. As observed by the very first geneticists, crossovers inhibit the formation of another crossover nearby, an elusive phenomenon called crossover interference. Another intriguing observation is heterochiasmy, the marked difference in male and female crossover rates observed in many species. Here, we show that the synaptonemal complex, a structure that zips homologous chromosomes together during meiosis, is essential for crossover interference in Arabidopsis. This suggests that a signal that inhibits crossover formation nearby a first crossover propagates along this specific structure. Furthermore, in the absence of the synaptonemal complex, crossover frequencies become identical in both sexes, suggesting that heterochiasmy is due to variation of crossover interference imposed by the synaptonemal complex. Meiotic crossovers (COs) have intriguing patterning properties, including CO interference, the tendency of COs to be well-spaced along chromosomes, and heterochiasmy, the marked difference in male and female CO rates. During meiosis, transverse filaments transiently associate the axes of homologous chromosomes, a process called synapsis that is essential for CO formation in many eukaryotes. Here, we describe the spatial organization of the transverse filaments in Arabidopsis (ZYP1) and show it to be evolutionary conserved. We show that in the absence of ZYP1 (zyp1a zyp1b null mutants), chromosomes associate in pairs but do not synapse. Unexpectedly, in absence of ZYP1, CO formation is not prevented but increased. Furthermore, genome-wide analysis of recombination revealed that CO interference is abolished, with the frequent observation of close COs. In addition, heterochiasmy was erased, with identical CO rates in males and females. This shows that the tripartite synaptonemal complex is dispensable for CO formation and has a key role in regulating their number and distribution, imposing CO interference and heterochiasmy.
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13
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Lee MS, Higashide MT, Choi H, Li K, Hong S, Lee K, Shinohara A, Shinohara M, Kim KP. The synaptonemal complex central region modulates crossover pathways and feedback control of meiotic double-strand break formation. Nucleic Acids Res 2021; 49:7537-7553. [PMID: 34197600 PMCID: PMC8287913 DOI: 10.1093/nar/gkab566] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 06/06/2021] [Accepted: 06/16/2021] [Indexed: 12/27/2022] Open
Abstract
The synaptonemal complex (SC) is a proteinaceous structure that mediates homolog engagement and genetic recombination during meiosis. In budding yeast, Zip-Mer-Msh (ZMM) proteins promote crossover (CO) formation and initiate SC formation. During SC elongation, the SUMOylated SC component Ecm11 and the Ecm11-interacting protein Gmc2 facilitate the polymerization of Zip1, an SC central region component. Through physical recombination, cytological, and genetic analyses, we found that ecm11 and gmc2 mutants exhibit chromosome-specific defects in meiotic recombination. CO frequencies on a short chromosome (chromosome III) were reduced, whereas CO and non-crossover frequencies on a long chromosome (chromosome VII) were elevated. Further, in ecm11 and gmc2 mutants, more double-strand breaks (DSBs) were formed on a long chromosome during late prophase I, implying that the Ecm11–Gmc2 (EG) complex is involved in the homeostatic regulation of DSB formation. The EG complex may participate in joint molecule (JM) processing and/or double-Holliday junction resolution for ZMM-dependent CO-designated recombination. Absence of the EG complex ameliorated the JM-processing defect in zmm mutants, suggesting a role for the EG complex in suppressing ZMM-independent recombination. Our results suggest that the SC central region functions as a compartment for sequestering recombination-associated proteins to regulate meiosis specificity during recombination.
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Affiliation(s)
- Min-Su Lee
- Department of Life Science, Chung-Ang University, Seoul 06974, South Korea
| | - Mika T Higashide
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan
| | - Hyungseok Choi
- Department of Life Science, Chung-Ang University, Seoul 06974, South Korea
| | - Ke Li
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.,Graduate School of Agriculture, Kindai University, Nara 631-8505, Japan
| | - Soogil Hong
- Department of Life Science, Chung-Ang University, Seoul 06974, South Korea
| | - Kangseok Lee
- Department of Life Science, Chung-Ang University, Seoul 06974, South Korea
| | - Akira Shinohara
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan
| | - Miki Shinohara
- Institute for Protein Research, Osaka University, Osaka 565-0871, Japan.,Graduate School of Agriculture, Kindai University, Nara 631-8505, Japan.,Agricultural Technology and Innovation Research Institute, Kindai University, Nara 631-8505, Japan
| | - Keun P Kim
- Department of Life Science, Chung-Ang University, Seoul 06974, South Korea
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14
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Grishaeva TM, Bogdanov YF. Synaptonemal Complex Proteins: Unicity or Universality? RUSS J GENET+ 2021. [DOI: 10.1134/s1022795421080068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Cardoso da Silva R, Vader G. Getting there: understanding the chromosomal recruitment of the AAA+ ATPase Pch2/TRIP13 during meiosis. Curr Genet 2021; 67:553-565. [PMID: 33712914 PMCID: PMC8254700 DOI: 10.1007/s00294-021-01166-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 02/16/2021] [Accepted: 02/18/2021] [Indexed: 12/21/2022]
Abstract
The generally conserved AAA+ ATPase Pch2/TRIP13 is involved in diverse aspects of meiosis, such as prophase checkpoint function, DNA break regulation, and meiotic recombination. The controlled recruitment of Pch2 to meiotic chromosomes allows it to use its ATPase activity to influence HORMA protein-dependent signaling. Because of the connection between Pch2 chromosomal recruitment and its functional roles in meiosis, it is important to reveal the molecular details that govern Pch2 localization. Here, we review the current understanding of the different factors that control the recruitment of Pch2 to meiotic chromosomes, with a focus on research performed in budding yeast. During meiosis in this organism, Pch2 is enriched within the nucleolus, where it likely associates with the specialized chromatin of the ribosomal (r)DNA. Pch2 is also found on non-rDNA euchromatin, where its recruitment is contingent on Zip1, a component of the synaptonemal complex (SC) that assembles between homologous chromosomes. We discuss recent findings connecting the recruitment of Pch2 with its association with the Origin Recognition Complex (ORC) and reliance on RNA Polymerase II-dependent transcription. In total, we provide a comprehensive overview of the pathways that control the chromosomal association of an important meiotic regulator.
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Affiliation(s)
- Richard Cardoso da Silva
- Department of Mechanistic Cell Biology, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227, Dortmund, Germany. .,Department of Molecular Mechanisms of Disease, University of Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland.
| | - Gerben Vader
- Department of Mechanistic Cell Biology, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227, Dortmund, Germany. .,Department of Clinical Genetics, Section of Oncogenetics, Cancer Center Amsterdam, De Boelelaan 1118, 1081 HV, Amsterdam, The Netherlands.
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16
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Yadav VK, Claeys Bouuaert C. Mechanism and Control of Meiotic DNA Double-Strand Break Formation in S. cerevisiae. Front Cell Dev Biol 2021; 9:642737. [PMID: 33748134 PMCID: PMC7968521 DOI: 10.3389/fcell.2021.642737] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Accepted: 02/01/2021] [Indexed: 12/17/2022] Open
Abstract
Developmentally programmed formation of DNA double-strand breaks (DSBs) by Spo11 initiates a recombination mechanism that promotes synapsis and the subsequent segregation of homologous chromosomes during meiosis. Although DSBs are induced to high levels in meiosis, their formation and repair are tightly regulated to minimize potentially dangerous consequences for genomic integrity. In S. cerevisiae, nine proteins participate with Spo11 in DSB formation, but their molecular functions have been challenging to define. Here, we describe our current view of the mechanism of meiotic DSB formation based on recent advances in the characterization of the structure and function of DSB proteins and discuss regulatory pathways in the light of recent models.
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Affiliation(s)
| | - Corentin Claeys Bouuaert
- Louvain Institute of Biomolecular Science and Technology, Université catholique de Louvain, Louvain-La-Neuve, Belgium
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17
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Gordon SG, Kursel LE, Xu K, Rog O. Synaptonemal Complex dimerization regulates chromosome alignment and crossover patterning in meiosis. PLoS Genet 2021; 17:e1009205. [PMID: 33730019 PMCID: PMC7968687 DOI: 10.1371/journal.pgen.1009205] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 02/15/2021] [Indexed: 12/30/2022] Open
Abstract
During sexual reproduction the parental homologous chromosomes find each other (pair) and align along their lengths by integrating local sequence homology with large-scale contiguity, thereby allowing for precise exchange of genetic information. The Synaptonemal Complex (SC) is a conserved zipper-like structure that assembles between the homologous chromosomes, bringing them together and regulating exchanges between them. However, the molecular mechanisms by which the SC carries out these functions remain poorly understood. Here we isolated and characterized two mutations in the dimerization interface in the middle of the SC zipper in C. elegans. The mutations perturb both chromosome alignment and the regulation of genetic exchanges. Underlying the chromosome-scale phenotypes are distinct alterations to the way SC subunits interact with one another. We propose a model whereby the SC brings homologous chromosomes together through two activities: obligate zipping that prevents assembly on unpaired chromosomes; and a tendency to extend pairing interactions along the entire length of the chromosomes.
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Affiliation(s)
- Spencer G. Gordon
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Lisa E. Kursel
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Kewei Xu
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
| | - Ofer Rog
- School of Biological Sciences, University of Utah, Salt Lake City, Utah, United States of America
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18
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Bhagwat NR, Owens SN, Ito M, Boinapalli JV, Poa P, Ditzel A, Kopparapu S, Mahalawat M, Davies OR, Collins SR, Johnson JR, Krogan NJ, Hunter N. SUMO is a pervasive regulator of meiosis. eLife 2021; 10:57720. [PMID: 33502312 PMCID: PMC7924959 DOI: 10.7554/elife.57720] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 01/26/2021] [Indexed: 02/06/2023] Open
Abstract
Protein modification by SUMO helps orchestrate the elaborate events of meiosis to faithfully produce haploid gametes. To date, only a handful of meiotic SUMO targets have been identified. Here, we delineate a multidimensional SUMO-modified meiotic proteome in budding yeast, identifying 2747 conjugation sites in 775 targets, and defining their relative levels and dynamics. Modified sites cluster in disordered regions and only a minority match consensus motifs. Target identities and modification dynamics imply that SUMOylation regulates all levels of chromosome organization and each step of meiotic prophase I. Execution-point analysis confirms these inferences, revealing functions for SUMO in S-phase, the initiation of recombination, chromosome synapsis and crossing over. K15-linked SUMO chains become prominent as chromosomes synapse and recombine, consistent with roles in these processes. SUMO also modifies ubiquitin, forming hybrid oligomers with potential to modulate ubiquitin signaling. We conclude that SUMO plays diverse and unanticipated roles in regulating meiotic chromosome metabolism. Most mammalian, yeast and other eukaryote cells have two sets of chromosomes, one from each parent, which contain all the cell’s DNA. Sex cells – like the sperm and egg – however, have half the number of chromosomes and are formed by a specialized type of cell division known as meiosis. At the start of meiosis, each cell replicates its chromosomes so that it has twice the amount of DNA. The cell then undergoes two rounds of division to form sex cells which each contain only one set of chromosomes. Before the cell divides, the two duplicated sets of chromosomes pair up and swap sections of their DNA. This exchange allows each new sex cell to have a unique combination of DNA, resulting in offspring that are genetically distinct from their parents. This complex series of events is tightly regulated, in part, by a protein called the 'small ubiquitin-like modifier' (or SUMO for short), which attaches itself to other proteins and modifies their behavior. This process, known as SUMOylation, can affect a protein’s stability, where it is located in the cell and how it interacts with other proteins. However, despite SUMO being known as a key regulator of meiosis, only a handful of its protein targets have been identified. To gain a better understanding of what SUMO does during meiosis, Bhagwat et al. set out to find which proteins are targeted by SUMO in budding yeast and to map the specific sites of modification. The experiments identified 2,747 different sites on 775 different proteins, suggesting that SUMO regulates all aspects of meiosis. Consistently, inactivating SUMOylation at different times revealed SUMO plays a role at every stage of meiosis, including the replication of DNA and the exchanges between chromosomes. In depth analysis of the targeted proteins also revealed that SUMOylation targets different groups of proteins at different stages of meiosis and interacts with other protein modifications, including the ubiquitin system which tags proteins for destruction. The data gathered by Bhagwat et al. provide a starting point for future research into precisely how SUMO proteins control meiosis in yeast and other organisms. In humans, errors in meiosis are the leading cause of pregnancy loss and congenital diseases. Most of the proteins identified as SUMO targets in budding yeast are also present in humans. So, this research could provide a platform for medical advances in the future. The next step is to study mammalian models, such as mice, to confirm that the regulation of meiosis by SUMO is the same in mammals as in yeast.
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Affiliation(s)
- Nikhil R Bhagwat
- Howard Hughes Medical Institute, University of California Davis, Davis, United States.,Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Shannon N Owens
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Masaru Ito
- Howard Hughes Medical Institute, University of California Davis, Davis, United States.,Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Jay V Boinapalli
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Philip Poa
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Alexander Ditzel
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Srujan Kopparapu
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Meghan Mahalawat
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Owen Richard Davies
- Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle upon Tyne, United Kingdom
| | - Sean R Collins
- Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States
| | - Jeffrey R Johnson
- Department of Cellular & Molecular Pharmacology, University of California San Francisco, San Francisco, United States
| | - Nevan J Krogan
- Department of Cellular & Molecular Pharmacology, University of California San Francisco, San Francisco, United States
| | - Neil Hunter
- Howard Hughes Medical Institute, University of California Davis, Davis, United States.,Department of Microbiology & Molecular Genetics, University of California Davis, Davis, United States.,Department of Molecular & Cellular Biology, University of California Davis, Davis, United States
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19
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Mu X, Murakami H, Mohibullah N, Keeney S. Chromosome-autonomous feedback down-regulates meiotic DNA break competence upon synaptonemal complex formation. Genes Dev 2020; 34:1605-1618. [PMID: 33184224 PMCID: PMC7706706 DOI: 10.1101/gad.342873.120] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/29/2020] [Indexed: 01/20/2023]
Abstract
The number of DNA double-strand breaks (DSBs) initiating meiotic recombination is elevated in Saccharomyces cerevisiae mutants that are globally defective in forming crossovers and synaptonemal complex (SC), a protein scaffold juxtaposing homologous chromosomes. These mutants thus appear to lack a negative feedback loop that inhibits DSB formation when homologs engage one another. This feedback is predicted to be chromosome autonomous, but this has not been tested. Moreover, what chromosomal process is recognized as "homolog engagement" remains unclear. To address these questions, we evaluated effects of homolog engagement defects restricted to small portions of the genome using karyotypically abnormal yeast strains with a homeologous chromosome V pair, monosomic V, or trisomy XV. We found that homolog engagement-defective chromosomes incurred more DSBs, concomitant with prolonged retention of the DSB-promoting protein Rec114, while the rest of the genome remained unaffected. SC-deficient, crossover-proficient mutants ecm11 and gmc2 experienced increased DSB numbers diagnostic of homolog engagement defects. These findings support the hypothesis that SC formation provokes DSB protein dissociation, leading in turn to loss of a DSB competent state. Our findings show that DSB number is regulated in a chromosome-autonomous fashion and provide insight into how homeostatic DSB controls respond to aneuploidy during meiosis.
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Affiliation(s)
- Xiaojing Mu
- Weill Cornell Graduate School of Medical Sciences, Cornell University, New York, New York 10021, USA
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Hajime Murakami
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Neeman Mohibullah
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
- Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
| | - Scott Keeney
- Weill Cornell Graduate School of Medical Sciences, Cornell University, New York, New York 10021, USA
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
- Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA
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20
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Serrano-Quílez J, Roig-Soucase S, Rodríguez-Navarro S. Sharing Marks: H3K4 Methylation and H2B Ubiquitination as Features of Meiotic Recombination and Transcription. Int J Mol Sci 2020; 21:ijms21124510. [PMID: 32630409 PMCID: PMC7350030 DOI: 10.3390/ijms21124510] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/13/2022] Open
Abstract
Meiosis is a specialized cell division that gives raise to four haploid gametes from a single diploid cell. During meiosis, homologous recombination is crucial to ensure genetic diversity and guarantee accurate chromosome segregation. Both the formation of programmed meiotic DNA double-strand breaks (DSBs) and their repair using homologous chromosomes are essential and highly regulated pathways. Similar to other processes that take place in the context of chromatin, histone posttranslational modifications (PTMs) constitute one of the major mechanisms to regulate meiotic recombination. In this review, we focus on specific PTMs occurring in histone tails as driving forces of different molecular events, including meiotic recombination and transcription. In particular, we concentrate on the influence of H3K4me3, H2BK123ub, and their corresponding molecular machineries that write, read, and erase these histone marks. The Spp1 subunit within the Complex of Proteins Associated with Set1 (COMPASS) is a critical regulator of H3K4me3-dependent meiotic DSB formation. On the other hand, the PAF1c (RNA polymerase II associated factor 1 complex) drives the ubiquitination of H2BK123 by Rad6-Bre1. We also discuss emerging evidence obtained by cryo-electron microscopy (EM) structure determination that has provided new insights into how the "cross-talk" between these two marks is accomplished.
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21
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He W, Rao HBDP, Tang S, Bhagwat N, Kulkarni DS, Ma Y, Chang MAW, Hall C, Bragg JW, Manasca HS, Baker C, Verhees GF, Ranjha L, Chen X, Hollingsworth NM, Cejka P, Hunter N. Regulated Proteolysis of MutSγ Controls Meiotic Crossing Over. Mol Cell 2020; 78:168-183.e5. [PMID: 32130890 DOI: 10.1016/j.molcel.2020.02.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/03/2020] [Accepted: 01/31/2020] [Indexed: 01/04/2023]
Abstract
Crossover recombination is essential for accurate chromosome segregation during meiosis. The MutSγ complex, Msh4-Msh5, facilitates crossing over by binding and stabilizing nascent recombination intermediates. We show that these activities are governed by regulated proteolysis. MutSγ is initially inactive for crossing over due to an N-terminal degron on Msh4 that renders it unstable by directly targeting proteasomal degradation. Activation of MutSγ requires the Dbf4-dependent kinase Cdc7 (DDK), which directly phosphorylates and thereby neutralizes the Msh4 degron. Genetic requirements for Msh4 phosphorylation indicate that DDK targets MutSγ only after it has bound to nascent joint molecules (JMs) in the context of synapsing chromosomes. Overexpression studies confirm that the steady-state level of Msh4, not phosphorylation per se, is the critical determinant for crossing over. At the DNA level, Msh4 phosphorylation enables the formation and crossover-biased resolution of double-Holliday Junction intermediates. Our study establishes regulated protein degradation as a fundamental mechanism underlying meiotic crossing over.
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Affiliation(s)
- Wei He
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - H B D Prasada Rao
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Shangming Tang
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Nikhil Bhagwat
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Dhananjaya S Kulkarni
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Yunmei Ma
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Maria A W Chang
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Christie Hall
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Junxi Wang Bragg
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Harrison S Manasca
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Christa Baker
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Gerrik F Verhees
- Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA
| | - Lepakshi Ranjha
- Institute for Research in Biomedicine, Università della Svizzera italiana, Bellinzona, Switzerland
| | - Xiangyu Chen
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York, USA
| | - Nancy M Hollingsworth
- Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York, USA
| | - Petr Cejka
- Institute for Research in Biomedicine, Università della Svizzera italiana, Bellinzona, Switzerland
| | - Neil Hunter
- Howard Hughes Medical Institute, University of California, Davis, Davis, California, USA; Department of Microbiology & Molecular Genetics, University of California, Davis, Davis, California, USA; Department of Molecular & Cellular Biology, University of California, Davis, Davis, California, USA; Department of Cell Biology & Human Anatomy, University of California, Davis, Davis, California, USA.
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22
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X chromosome and autosomal recombination are differentially sensitive to disruptions in SC maintenance. Proc Natl Acad Sci U S A 2019; 116:21641-21650. [PMID: 31570610 DOI: 10.1073/pnas.1910840116] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The synaptonemal complex (SC) is a conserved meiotic structure that regulates the repair of double-strand breaks (DSBs) into crossovers or gene conversions. The removal of any central-region SC component, such as the Drosophila melanogaster transverse filament protein C(3)G, causes a complete loss of SC structure and crossovers. To better understand the role of the SC in meiosis, we used CRISPR/Cas9 to construct 3 in-frame deletions within the predicted coiled-coil region of the C(3)G protein. Since these 3 deletion mutations disrupt SC maintenance at different times during pachytene and exhibit distinct defects in key meiotic processes, they allow us to define the stages of pachytene when the SC is necessary for homolog pairing and recombination during pachytene. Our studies demonstrate that the X chromosome and the autosomes display substantially different defects in pairing and recombination when SC structure is disrupted, suggesting that the X chromosome is potentially regulated differently from the autosomes.
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23
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Pyatnitskaya A, Borde V, De Muyt A. Crossing and zipping: molecular duties of the ZMM proteins in meiosis. Chromosoma 2019; 128:181-198. [PMID: 31236671 DOI: 10.1007/s00412-019-00714-8] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 06/07/2019] [Accepted: 06/13/2019] [Indexed: 11/25/2022]
Abstract
Accurate segregation of homologous chromosomes during meiosis depends on the ability of meiotic cells to promote reciprocal exchanges between parental DNA strands, known as crossovers (COs). For most organisms, including budding yeast and other fungi, mammals, nematodes, and plants, the major CO pathway depends on ZMM proteins, a set of molecular actors specifically devoted to recognize and stabilize CO-specific DNA intermediates that are formed during homologous recombination. The progressive implementation of ZMM-dependent COs takes place within the context of the synaptonemal complex (SC), a proteinaceous structure that polymerizes between homologs and participates in close homolog juxtaposition during prophase I of meiosis. While SC polymerization starts from ZMM-bound sites and ZMM proteins are required for SC polymerization in budding yeast and the fungus Sordaria, other organisms differ in their requirement for ZMM in SC elongation. This review provides an overview of ZMM functions and discusses their collaborative tasks for CO formation and SC assembly, based on recent findings and on a comparison of different model organisms.
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Affiliation(s)
- Alexandra Pyatnitskaya
- Institut Curie, PSL Research University, CNRS, UMR3244, Paris, France
- Paris Sorbonne Université, Paris, France
| | - Valérie Borde
- Institut Curie, PSL Research University, CNRS, UMR3244, Paris, France.
- Paris Sorbonne Université, Paris, France.
| | - Arnaud De Muyt
- Institut Curie, PSL Research University, CNRS, UMR3244, Paris, France.
- Paris Sorbonne Université, Paris, France.
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24
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Crossover recombination and synapsis are linked by adjacent regions within the N terminus of the Zip1 synaptonemal complex protein. PLoS Genet 2019; 15:e1008201. [PMID: 31220082 PMCID: PMC6605668 DOI: 10.1371/journal.pgen.1008201] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 07/02/2019] [Accepted: 05/17/2019] [Indexed: 11/19/2022] Open
Abstract
Accurate chromosome segregation during meiosis relies on the prior establishment of at least one crossover recombination event between homologous chromosomes. Most meiotic recombination intermediates that give rise to interhomolog crossovers are embedded within a hallmark chromosomal structure called the synaptonemal complex (SC), but the mechanisms that coordinate the processes of SC assembly (synapsis) and crossover recombination remain poorly understood. Among known structural components of the budding yeast SC, the Zip1 protein is unique for its independent role in promoting crossover recombination; Zip1 is specifically required for the large subset of crossovers that also rely on the meiosis-specific MutSγ complex. Here we report that adjacent regions within Zip1’s N terminus encompass its crossover and synapsis functions. We previously showed that deletion of Zip1 residues 21–163 abolishes tripartite SC assembly and prevents robust SUMOylation of the SC central element component, Ecm11, but allows excess MutSγ crossover recombination. We find the reciprocal phenotype when Zip1 residues 2–9 or 10–14 are deleted; in these mutants SC assembles and Ecm11 is hyperSUMOylated, but MutSγ crossovers are strongly diminished. Interestingly, Zip1 residues 2–9 or 2–14 are required for the normal localization of Zip3, a putative E3 SUMO ligase and pro-MutSγ crossover factor, to Zip1 polycomplex structures and to recombination initiation sites. By contrast, deletion of Zip1 residues 15–20 does not detectably prevent Zip3’s localization at Zip1 polycomplex and supports some MutSγ crossing over but prevents normal SC assembly and Ecm11 SUMOylation. Our results highlight distinct N terminal regions that are differentially critical for Zip1’s roles in crossing over and SC assembly; we speculate that the adjacency of these regions enables Zip1 to serve as a liaison, facilitating crosstalk between the two processes by bringing crossover recombination and synapsis factors within close proximity of one another. Reproductive cell formation relies on a nuclear division cycle called meiosis, wherein two homologous sets of chromosomes are reduced to one. At the crux of (and critically required for) meiotic chromosome segregation is a transient association between homologous chromosomes established by a crossover recombination event. Recombination intermediates embed within a ~100 nm wide proteinaceous structure that connects aligned homologous axes, the synaptonemal complex (SC). While genetic data implicate certain SC structural proteins in crossover formation, it is unclear how such coiled-coil, rod-like proteins carry out their recombination function. Our structure-function analysis of the yeast SC transverse filament protein, Zip1, reveals pro-crossover and pro-synapsis functions that are encompassed by adjacent N terminal regions. We also discovered that the pro-crossover region of Zip1 promotes proper localization of pro-crossover factor and putative SUMO ligase, Zip3, to meiotic recombination sites. Zip3 is known to not only promote crossovers but also to influence the post-translational modification of another SC structural component, Ecm11, which is dispensable for crossovers. Our findings raise the possibility that Zip1’s N terminus acts as a liaison to connect pro-crossover factors (like Zip3) to SC assembly proteins (such as Ecm11) in order to coordinate the two landmark meiotic chromosomal processes.
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25
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Abstract
A central feature of meiosis is pairing of homologous chromosomes, which occurs in two stages: coalignment of axes followed by installation of the synaptonemal complex (SC). Concomitantly, recombination complexes reposition from on-axis association to the SC central region. We show here that, in the fungus Sordaria macrospora, this critical transition is mediated by robust interaxis bridges that contain an axis component (Spo76/Pds5), DNA, plus colocalizing Mer3/Msh4 recombination proteins and the Zip2-Zip4 mediator complex. Mer3-Msh4-Zip2-Zip4 colocalizing foci are first released from their tight axis association, dependent on the SC transverse-filament protein Sme4/Zip1, before moving to bridges and thus to a between-axis position. Ensuing shortening of bridges and accompanying juxtaposition of axes to 100 nm enables installation of SC central elements at sites of between-axis Mer3-Msh4-Zip2-Zip4 complexes. We show also that the Zip2-Zip4 complex has an intrinsic affinity for chromosome axes at early leptotene, where it localizes independently of recombination, but is dependent on Mer3. Then, later, Zip2-Zip4 has an intrinsic affinity for the SC central element, where it ultimately localizes to sites of crossover complexes at the end of pachytene. These and other findings suggest that the fundamental role of Zip2-Zip4 is to mediate the recombination/structure interface at all post-double-strand break stages. We propose that Zip2-Zip4 directly mediates a molecular handoff of Mer3-Msh4 complexes, from association with axis components to association with SC central components, at the bridge stage, and then directly mediates central region installation during SC nucleation.
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26
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West AMV, Rosenberg SC, Ur SN, Lehmer MK, Ye Q, Hagemann G, Caballero I, Usón I, MacQueen AJ, Herzog F, Corbett KD. A conserved filamentous assembly underlies the structure of the meiotic chromosome axis. eLife 2019; 8:e40372. [PMID: 30657449 PMCID: PMC6349405 DOI: 10.7554/elife.40372] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 01/18/2019] [Indexed: 11/30/2022] Open
Abstract
The meiotic chromosome axis plays key roles in meiotic chromosome organization and recombination, yet the underlying protein components of this structure are highly diverged. Here, we show that 'axis core proteins' from budding yeast (Red1), mammals (SYCP2/SYCP3), and plants (ASY3/ASY4) are evolutionarily related and play equivalent roles in chromosome axis assembly. We first identify 'closure motifs' in each complex that recruit meiotic HORMADs, the master regulators of meiotic recombination. We next find that axis core proteins form homotetrameric (Red1) or heterotetrameric (SYCP2:SYCP3 and ASY3:ASY4) coiled-coil assemblies that further oligomerize into micron-length filaments. Thus, the meiotic chromosome axis core in fungi, mammals, and plants shares a common molecular architecture, and likely also plays conserved roles in meiotic chromosome axis assembly and recombination control.
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Affiliation(s)
- Alan MV West
- Biomedical Sciences Graduate ProgramUniversity of California, San DiegoLa JollaUnited States
- Department of Cellular and Molecular MedicineUniversity of California, San DiegoLa JollaUnited States
| | - Scott C Rosenberg
- Department of ChemistryUniversity of California, San DiegoLa JollaUnited States
| | - Sarah N Ur
- Biomedical Sciences Graduate ProgramUniversity of California, San DiegoLa JollaUnited States
| | - Madison K Lehmer
- Department of Cellular and Molecular MedicineUniversity of California, San DiegoLa JollaUnited States
| | - Qiaozhen Ye
- Department of Cellular and Molecular MedicineUniversity of California, San DiegoLa JollaUnited States
| | - Götz Hagemann
- Gene Center and Department of BiochemistryLudwig-Maximilians-Universität MünchenMunichGermany
| | - Iracema Caballero
- Crystallographic MethodsInstitute of Molecular Biology of Barcelona (IBMB-CSIC)BarcelonaSpain
| | - Isabel Usón
- Crystallographic MethodsInstitute of Molecular Biology of Barcelona (IBMB-CSIC)BarcelonaSpain
- Institució Catalana de Recerca i Estudis Avançats (ICREA)BarcelonaSpain
| | - Amy J MacQueen
- Department of Molecular Biology and BiochemistryWesleyan UniversityMiddletownUnited States
| | - Franz Herzog
- Gene Center and Department of BiochemistryLudwig-Maximilians-Universität MünchenMunichGermany
| | - Kevin D Corbett
- Department of Cellular and Molecular MedicineUniversity of California, San DiegoLa JollaUnited States
- Department of ChemistryUniversity of California, San DiegoLa JollaUnited States
- Ludwig Institute for Cancer ResearchLa JollaUnited States
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27
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HO Endonuclease-Initiated Recombination in Yeast Meiosis Fails To Promote Homologous Centromere Pairing and Is Not Constrained To Utilize the Dmc1 Recombinase. G3-GENES GENOMES GENETICS 2018; 8:3637-3659. [PMID: 30254180 PMCID: PMC6222578 DOI: 10.1534/g3.118.200641] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Crossover recombination during meiosis is accompanied by a dramatic chromosome reorganization. In Saccharomyces cerevisiae, the onset of meiotic recombination by the Spo11 transesterase leads to stable pairwise associations between previously unassociated homologous centromeres followed by the intimate alignment of homologous axes via synaptonemal complex (SC) assembly. However, the molecular relationship between recombination and global meiotic chromosome reorganization remains poorly understood. In budding yeast, one question is why SC assembly initiates earliest at centromere regions while the DNA double strand breaks (DSBs) that initiate recombination occur genome-wide. We targeted the site-specific HO endonuclease to various positions on S. cerevisiae’s longest chromosome in order to ask whether a meiotic DSB’s proximity to the centromere influences its capacity to promote homologous centromere pairing and SC assembly. We show that repair of an HO-mediated DSB does not promote homologous centromere pairing nor any extent of SC assembly in spo11 meiotic nuclei, regardless of its proximity to the centromere. DSBs induced en masse by phleomycin exposure likewise do not promote homologous centromere pairing nor robust SC assembly. Interestingly, in contrast to Spo11, HO-initiated interhomolog recombination is not affected by loss of the meiotic kinase, Mek1, and is not constrained to use the meiosis-specific Dmc1 recombinase. These results strengthen the previously proposed idea that (at least some) Spo11 DSBs may be specialized in activating mechanisms that both 1) reinforce homologous chromosome alignment via homologous centromere pairing and SC assembly, and 2) establish Dmc1 as the primary strand exchange enzyme.
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Shodhan A, Kataoka K, Mochizuki K, Novatchkova M, Loidl J. A Zip3-like protein plays a role in crossover formation in the SC-less meiosis of the protist Tetrahymena. Mol Biol Cell 2017; 28:825-833. [PMID: 28100637 PMCID: PMC5349789 DOI: 10.1091/mbc.e16-09-0678] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 12/21/2016] [Accepted: 01/09/2017] [Indexed: 11/11/2022] Open
Abstract
When programmed meiotic DNA double-strand breaks (DSBs) undergo recombinational repair, genetic crossovers (COs) may be formed. A certain level of this is required for the faithful segregation of chromosomes, but the majority of DSBs are processed toward a safer alternative, namely noncrossovers (NCOs), via nonreciprocal DNA exchange. At the crossroads between these two DSB fates is the Msh4-Msh5 (MutSγ) complex, which stabilizes CO-destined recombination intermediates and members of the Zip3/RNF212 family of RING finger proteins, which in turn stabilize MutSγ. These proteins function in the context of the synaptonemal complex (SC) and mainly act on SC-dependent COs. Here we show that in the SC-less ciliate Tetrahymena, Zhp3 (a protein distantly related to Zip3/RNF212), together with MutSγ, is responsible for the majority of COs. This activity of Zhp3 suggests an evolutionarily conserved SC-independent strategy for balancing CO:NCO ratios. Moreover, we report a novel meiosis-specific protein, Sa15, as an interacting partner of Zhp3. Sa15 forms linear structures in meiotic prophase nuclei to which Zhp3 localizes. Sa15 is required for a wild-type level of CO formation. Its linear organization suggests the existence of an underlying chromosomal axis that serves as a scaffold for Zhp3 and other recombination proteins.
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Affiliation(s)
- Anura Shodhan
- Department of Chromosome Biology, University of Vienna, Vienna Biocenter, 1030 Vienna, Austria
| | - Kensuke Kataoka
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences and
| | - Kazufumi Mochizuki
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences and
| | - Maria Novatchkova
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences and
- Research Institute of Molecular Pathology, 1030 Vienna, Austria
| | - Josef Loidl
- Department of Chromosome Biology, University of Vienna, Vienna Biocenter, 1030 Vienna, Austria
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Pattabiraman D, Roelens B, Woglar A, Villeneuve AM. Meiotic recombination modulates the structure and dynamics of the synaptonemal complex during C. elegans meiosis. PLoS Genet 2017; 13:e1006670. [PMID: 28339470 PMCID: PMC5384771 DOI: 10.1371/journal.pgen.1006670] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 04/07/2017] [Accepted: 03/06/2017] [Indexed: 12/04/2022] Open
Abstract
During meiotic prophase, a structure called the synaptonemal complex (SC) assembles at the interface between aligned pairs of homologous chromosomes, and crossover recombination events occur between their DNA molecules. Here we investigate the inter-relationships between these two hallmark features of the meiotic program in the nematode C. elegans, revealing dynamic properties of the SC that are modulated by recombination. We demonstrate that the SC incorporates new subunits and switches from a more highly dynamic/labile state to a more stable state as germ cells progress through the pachytene stage of meiotic prophase. We further show that the more dynamic state of the SC is prolonged in mutants where meiotic recombination is impaired. Moreover, in meiotic mutants where recombination intermediates are present in limiting numbers, SC central region subunits become preferentially stabilized on the subset of chromosome pairs that harbor a site where pro-crossover factors COSA-1 and MutSγ are concentrated. Polo-like kinase PLK-2 becomes preferentially localized to the SCs of chromosome pairs harboring recombination sites prior to the enrichment of SC central region proteins on such chromosomes, and PLK-2 is required for this enrichment to occur. Further, late pachytene nuclei in a plk-2 mutant exhibit the more highly dynamic SC state. Together our data demonstrate that crossover recombination events elicit chromosome-autonomous stabilizing effects on the SC and implicate PLK-2 in this process. We discuss how this recombination-triggered modulation of SC state might contribute to regulatory mechanisms that operate during meiosis to ensure the formation of crossovers while at the same time limiting their numbers.
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Affiliation(s)
- Divya Pattabiraman
- Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Baptiste Roelens
- Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Alexander Woglar
- Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, California, United States of America
| | - Anne M. Villeneuve
- Departments of Developmental Biology and Genetics, Stanford University School of Medicine, Stanford, California, United States of America
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Lambing C, Franklin FCH, Wang CJR. Understanding and Manipulating Meiotic Recombination in Plants. PLANT PHYSIOLOGY 2017; 173:1530-1542. [PMID: 28108697 PMCID: PMC5338670 DOI: 10.1104/pp.16.01530] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 01/18/2017] [Indexed: 05/18/2023]
Abstract
Meiosis is a specialized cell division, essential in most reproducing organisms to halve the number of chromosomes, thereby enabling the restoration of ploidy levels during fertilization. A key step of meiosis is homologous recombination, which promotes homologous pairing and generates crossovers (COs) to connect homologous chromosomes until their separation at anaphase I. These CO sites, seen cytologically as chiasmata, represent a reciprocal exchange of genetic information between two homologous nonsister chromatids. This gene reshuffling during meiosis has a significant influence on evolution and also plays an essential role in plant breeding, because a successful breeding program depends on the ability to bring the desired combinations of alleles on chromosomes. However, the number and distribution of COs during meiosis is highly constrained. There is at least one CO per chromosome pair to ensure accurate segregation of homologs, but in most organisms, the CO number rarely exceeds three regardless of chromosome size. Moreover, their positions are not random on chromosomes but exhibit regional preference. Thus, genes in recombination-poor regions tend to be inherited together, hindering the generation of novel allelic combinations that could be exploited by breeding programs. Recently, much progress has been made in understanding meiotic recombination. In particular, many genes involved in the process in Arabidopsis (Arabidopsis thaliana) have been identified and analyzed. With the coming challenges of food security and climate change, and our enhanced knowledge of how COs are formed, the interest and needs in manipulating CO formation are greater than ever before. In this review, we focus on advances in understanding meiotic recombination and then summarize the attempts to manipulate CO formation. Last, we pay special attention to the meiotic recombination in polyploidy, which is a common genomic feature for many crop plants.
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Affiliation(s)
- Christophe Lambing
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom (C.L.)
- School of Biosciences, University of Birmingham, Birmingham B15 2TT, United Kingdom (F.C.H.F.); and
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529 Taiwan (C.-J.R.W.)
| | - F Chris H Franklin
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom (C.L.)
- School of Biosciences, University of Birmingham, Birmingham B15 2TT, United Kingdom (F.C.H.F.); and
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529 Taiwan (C.-J.R.W.)
| | - Chung-Ju Rachel Wang
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom (C.L.);
- School of Biosciences, University of Birmingham, Birmingham B15 2TT, United Kingdom (F.C.H.F.); and
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529 Taiwan (C.-J.R.W.)
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A Surveillance System Ensures Crossover Formation in C. elegans. Curr Biol 2016; 26:2873-2884. [PMID: 27720619 DOI: 10.1016/j.cub.2016.09.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 07/27/2016] [Accepted: 09/06/2016] [Indexed: 11/23/2022]
Abstract
Crossover (CO) recombination creates a physical connection between homologs that promotes their proper segregation at meiosis I (MI). Failure to realize an obligate CO causes homologs to attach independently to the MI spindle and separate randomly, leading to nondisjunction. However, mechanisms that determine whether homolog pairs have received crossovers remain mysterious. Here we describe a surveillance system in C. elegans that monitors recombination intermediates and couples their formation to meiotic progression. Recombination intermediates are required to activate the system, which then delays further processing if crossover precursors are lacking on even one chromosome. The synaptonemal complex, a specialized, proteinaceous structure connecting homologous chromosomes, is stabilized in cis on chromosomes that receive a crossover and is destabilized on those lacking crossovers, a process that is dependent on the function of the polo-like kinase PLK-2. These results reveal a new layer of communication between crossover-committed intermediates and the synaptonemal complex that functions as a cis-acting, obligate, crossover-counting mechanism.
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