1
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Liu N, Qiang W, Jordan PW, Marko JF, Qiao H. Cell cycle and age-related modulations of mouse chromosome stiffness. eLife 2025; 13:RP97403. [PMID: 40226924 PMCID: PMC11996174 DOI: 10.7554/elife.97403] [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] [Indexed: 04/15/2025] Open
Abstract
Chromosome structure is complex, and many aspects of chromosome organization are still not understood. Measuring the stiffness of chromosomes offers valuable insight into their structural properties. In this study, we analyzed the stiffness of chromosomes from metaphase I (MI) and metaphase II (MII) oocytes. Our results revealed a tenfold increase in stiffness (Young's modulus) of MI chromosomes compared to somatic chromosomes. Furthermore, the stiffness of MII chromosomes was found to be lower than that of MI chromosomes. We examined the role of meiosis-specific cohesin complexes in regulating chromosome stiffness. Surprisingly, the stiffness of chromosomes from three meiosis-specific cohesin mutants did not significantly differ from that of wild-type chromosomes, indicating that these cohesins may not be primary determinants of chromosome stiffness. Additionally, our findings revealed an age-related increase of chromosome stiffness for MI oocytes. Since aging is associated with elevated levels of DNA damage, we investigated the impact of etoposide-induced DNA damage on chromosome stiffness and found that it led to a reduction in stiffness in MI oocytes. Overall, our study underscores the dynamic and cyclical nature of chromosome stiffness, modulated by both the cell cycle and age-related factors.
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Affiliation(s)
- Ning Liu
- Department of Comparative Biosciences, University of Illinois at Urbana-ChampaignUrbanaUnited States
| | - Wenan Qiang
- The Chemistry of Life Processes Institute, Northwestern UniversityEvanstonUnited States
- Division of Reproductive Science in Medicine, Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern UniversityChicagoUnited States
| | - Philip W Jordan
- Biochemistry and Molecular Biology Departments, Johns Hopkins University Bloomberg School of Public HealthBaltimoreUnited States
- Biochemistry and Molecular Biology Department, School of Medicine, Uniformed Services University of the Health SciencesBethesdaUnited States
| | - John F Marko
- Department of Molecular Biosciences, Northwestern UniversityEvanstonUnited States
- Department of Physics and Astronomy, Northwestern UniversityEvanstonUnited States
| | - Huanyu Qiao
- Department of Comparative Biosciences, University of Illinois at Urbana-ChampaignUrbanaUnited States
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2
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Liu N, Qiang W, Jordan P, Marko JF, Qiao H. Cell cycle and Age-Related Modulations of Mouse Chromosome Stiffness. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2025:2024.03.06.583771. [PMID: 38559262 PMCID: PMC10979861 DOI: 10.1101/2024.03.06.583771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Chromosome structure is complex, and many aspects of chromosome organization are still not understood. Measuring the stiffness of chromosomes offers valuable insight into their structural properties. In this study, we analyzed the stiffness of chromosomes from metaphase I (MI) and metaphase II (MII) oocytes. Our results revealed a ten-fold increase in stiffness (Young's modulus) of MI chromosomes compared to somatic chromosomes. Furthermore, the stiffness of MII chromosomes was found to be lower than that of MI chromosomes. We examined the role of meiosis-specific cohesin complexes in regulating chromosome stiffness. Surprisingly, the stiffness of chromosomes from three meiosis-specific cohesin mutants did not significantly differ from that of wild-type chromosomes, indicating that these cohesins may not be primary determinants of chromosome stiffness. Additionally, our findings revealed an age-related increase of chromosome stiffness for MI oocytes. Since aging is associated with elevated levels of DNA damage, we investigated the impact of etoposide-induced DNA damage on chromosome stiffness and found that it led to a reduction in stiffness in MI oocytes. Overall, our study underscores the dynamic and cyclical nature of chromosome stiffness, modulated by both the cell cycle, and by age-related factors.
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Affiliation(s)
- Ning Liu
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Wenan Qiang
- Center for Developmental Therapeutics, Northwestern University, Evanston, IL, USA
| | - Philip Jordan
- Biochemistry and Molecular Biology Departments, Johns Hopkins University, Baltimore, MD, USA
- School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - John F Marko
- Department of Molecular Biosciences, Northwestern University, Evanston, IL, USA 60208
- Department of Physics and Astronomy, Northwestern University, Evanston, IL, USA 60208
| | - Huanyu Qiao
- Department of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
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3
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Xu J, Li T, Kim S, Boekhout M, Keeney S. Essential roles of the ANKRD31-REC114 interaction in meiotic recombination and mouse spermatogenesis. Proc Natl Acad Sci U S A 2023; 120:e2310951120. [PMID: 37976262 PMCID: PMC10666023 DOI: 10.1073/pnas.2310951120] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 10/10/2023] [Indexed: 11/19/2023] Open
Abstract
Meiotic DNA double-strand breaks (DSBs) initiate homologous recombination and are crucial for ensuring proper chromosome segregation. In mice, ANKRD31 recently emerged as a regulator of DSB timing, number, and location, with a particularly important role in targeting DSBs to the pseudoautosomal regions (PARs) of sex chromosomes. ANKRD31 interacts with multiple proteins, including the conserved and essential DSB-promoting factor REC114, so it was hypothesized to be a modular scaffold that "anchors" other proteins together and to meiotic chromosomes. To determine whether and why the REC114 interaction is important for ANKRD31 function, we generated mice with Ankrd31 mutations that either reduced (missense mutation) or eliminated (C-terminal truncation) the ANKRD31-REC114 interaction without diminishing contacts with other known partners. A complete lack of the ANKRD31-REC114 interaction mimicked an Ankrd31 null, with delayed DSB formation and recombination, defects in DSB repair, and altered DSB locations including failure to target DSBs to the PARs. In contrast, when the ANKRD31-REC114 interaction was substantially but not completely disrupted, spermatocytes again showed delayed DSB formation globally, but recombination and repair were hardly affected and DSB locations were similar to control mice. The missense Ankrd31 allele showed a dosage effect, wherein combining it with the null or C-terminal truncation allele resulted in intermediate phenotypes for DSB formation, recombination, and DSB locations. Our results show that ANKRD31 function is critically dependent on its interaction with REC114 and that defects in ANKRD31 activity correlate with the severity of the disruption of the interaction.
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Affiliation(s)
- Jiaqi Xu
- Biochemistry, Cell, and Molecular Biology (BCMB) Allied Program, Weill Cornell Graduate School of Medical Sciences, New York, NY10065
- Molecular Biology Program, Memorial Sloan Kettering Cancer, New York, NY10065
| | - Tao Li
- Molecular Biology Program, Memorial Sloan Kettering Cancer, New York, NY10065
| | - Soonjoung Kim
- Molecular Biology Program, Memorial Sloan Kettering Cancer, New York, NY10065
| | - Michiel Boekhout
- Molecular Biology Program, Memorial Sloan Kettering Cancer, New York, NY10065
| | - Scott Keeney
- Biochemistry, Cell, and Molecular Biology (BCMB) Allied Program, Weill Cornell Graduate School of Medical Sciences, New York, NY10065
- Molecular Biology Program, Memorial Sloan Kettering Cancer, New York, NY10065
- HHMI, Memorial Sloan Kettering Cancer Center, New York, NY10065
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4
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Xu J, Li T, Kim C, Boekhout M, Keeney S. Essential roles of the ANKRD31-REC114 interaction in meiotic recombination and mouse spermatogenesis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.04.27.538541. [PMID: 37162821 PMCID: PMC10168363 DOI: 10.1101/2023.04.27.538541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Meiotic DNA double-strand breaks (DSBs) initiate homologous recombination and are crucial for ensuring proper chromosome segregation. In mice, ANKRD31 recently emerged as a regulator of DSB timing, number, and location, with a particularly important role in targeting DSBs to the pseudoautosomal regions (PARs) of sex chromosomes. ANKRD31 interacts with multiple proteins, including the conserved and essential DSB-promoting factor REC114, so it was hypothesized to be a modular scaffold that "anchors" other proteins together and to meiotic chromosomes. To determine if and why the REC114 interaction is important for ANKRD31 function, we generated mice with Ankrd31 mutations that either reduced (missense mutation) or eliminated (C-terminal truncation) the ANKRD31-REC114 interaction without diminishing contacts with other known partners. A complete lack of the ANKRD31-REC114 interaction mimicked an Ankrd31 null, with delayed DSB formation and recombination, defects in DSB repair, and altered DSB locations including failure to target DSBs to the PARs. In contrast, when the ANKRD31-REC114 interaction was substantially but not completely disrupted, spermatocytes again showed delayed DSB formation globally, but recombination and repair were hardly affected and DSB locations were similar to control mice. The missense Ankrd31 allele showed a dosage effect, wherein combining it with the null or C-terminal truncation allele resulted in intermediate phenotypes for DSB formation, recombination, and DSB locations. Our results show that ANKRD31 function is critically dependent on its interaction with REC114, and that defects in ANKRD31 activity correlate with the severity of the disruption of the interaction.
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Affiliation(s)
- Jiaqi Xu
- Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Tao Li
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Coojong Kim
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Michiel Boekhout
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Scott Keeney
- Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
- Howard Hughes Medical Institute, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
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5
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Cai X, Stringer JM, Zerafa N, Carroll J, Hutt KJ. Xrcc5/Ku80 is required for the repair of DNA damage in fully grown meiotically arrested mammalian oocytes. Cell Death Dis 2023; 14:397. [PMID: 37407587 DOI: 10.1038/s41419-023-05886-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 05/07/2023] [Accepted: 06/12/2023] [Indexed: 07/07/2023]
Abstract
Mammalian oocytes spend most of their life in a unique state of cell cycle arrest at meiotic prophase I, during which time they are exposed to countless DNA-damaging events. Recent studies have shown that DNA double-strand break repair occurs predominantly via the homologous recombination (HR) pathway in small non-growing meiotically arrested oocytes (primordial follicle stage). However, the DNA repair mechanisms employed by fully grown meiotically arrested oocytes (GV-stage) have not been studied in detail. Here we established a conditional knockout mouse model to explore the role of Ku80, a critical component of the nonhomologous end joining (NHEJ) pathway, in the repair of DNA damage in GV oocytes. GV oocytes lacking Ku80 failed to repair etoposide-induced DNA damage, even when only low levels of damage were sustained. This indicates Ku80 is needed to resolve DSBs and that HR cannot compensate for a compromised NHEJ pathway in fully-grown oocytes. When higher levels of DNA damage were induced, a severe delay in M-phase entry was observed in oocytes lacking XRCC5 compared to wild-type oocytes, suggesting that Ku80-dependent repair of DNA damage is important for the timely release of oocytes from prophase I and resumption of meiosis. Ku80 was also found to be critical for chromosome integrity during meiotic maturation following etoposide exposure. These data demonstrate that Ku80, and NHEJ, are vital for quality control in mammalian GV stage oocytes and reveal that DNA repair pathway choice differs in meiotically arrested oocytes according to growth status.
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Affiliation(s)
- Xuebi Cai
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia
| | - Jessica M Stringer
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia
| | - Nadeen Zerafa
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia
| | - John Carroll
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia
| | - Karla J Hutt
- Department of Anatomy and Developmental Biology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, 3800, Australia.
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6
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Loose JA, Amrit FRG, Patil T, Yanowitz JL, Ghazi A. Meiotic dysfunction accelerates somatic aging in Caenorhabditis elegans. Aging Cell 2022; 21:e13716. [PMID: 36176234 PMCID: PMC9649607 DOI: 10.1111/acel.13716] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 08/07/2022] [Accepted: 08/31/2022] [Indexed: 01/25/2023] Open
Abstract
An expanding body of evidence, from studies in model organisms to human clinical data, reveals that reproductive health influences organismal aging. However, the impact of germline integrity on somatic aging is poorly understood. Moreover, assessing the causal relationship of such an impact is challenging to address in human and vertebrate models. Here, we demonstrate that disruption of meiosis, a germline restricted process, shortened lifespan, impaired individual aspects of healthspan, and accelerated somatic aging in Caenorhabditis elegans. Young meiotic mutants exhibited transcriptional profiles that showed remarkable overlap with the transcriptomes of old worms and shared similarities with transcriptomes of aging human tissues as well. We found that meiosis dysfunction caused increased expression of functionally relevant longevity determinants whose inactivation enhanced the lifespan of normal animals. Further, meiotic mutants manifested destabilized protein homeostasis and enhanced proteasomal activity partially rescued the associated lifespan defects. Our study demonstrates a role for meiotic integrity in controlling somatic aging and reveals proteostasis control as a potential mechanism through which germline status impacts overall organismal health.
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Affiliation(s)
- Julia A. Loose
- Department of Pediatrics, John G. Rangos Sr. Research CenterUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Francis R. G. Amrit
- Department of Pediatrics, John G. Rangos Sr. Research CenterUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Thayjas Patil
- Department of Pediatrics, John G. Rangos Sr. Research CenterUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
| | - Judith L. Yanowitz
- Department of Obstetrics, Gynecology, and Reproductive Sciences, Magee‐Womens Research InstituteUniversity of Pittsburgh School of MedicinePittsburghPAUSA
| | - Arjumand Ghazi
- Department of Pediatrics, John G. Rangos Sr. Research CenterUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA,Department of Developmental Biology, John G. Rangos Sr. Research CenterUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA,Department of Cell Biology & PhysiologyUniversity of Pittsburgh School of MedicinePittsburghPennsylvaniaUSA
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7
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Matveevsky S, Grishaeva T. Heterogeneity in conservation of multifunctional partner enzymes with meiotic importance, CDK2 kinase and BRCA1 ubiquitin ligase. PeerJ 2021; 9:e12231. [PMID: 34692254 PMCID: PMC8483008 DOI: 10.7717/peerj.12231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/09/2021] [Indexed: 12/04/2022] Open
Abstract
The evolution of proteins can be accompanied by changes not only to their amino acid sequences, but also their structural and spatial molecular organization. Comparison of the protein conservation within different taxonomic groups (multifunctional, or highly specific) allows to clarify their specificity and the direction of evolution. Two multifunctional enzymes, cyclin-dependent kinase 2 (CDK2) and BRCA1 ubiquitin ligase, that are partners in some mitotic and meiotic processes were investigated in the present work. Two research methods, bioinformatics and immunocytochemical, were combined to examine the conservation levels of the two enzymes. It has been established that CDK2 is a highly conserved protein in different taxonomic lineages of the eukaryotic tree. Immunocytochemically, a conserved CDK2 pattern was revealed in the meiotic autosomes of five rodent species and partially in domestic turkey and clawed frog. Nevertheless, variable CDK2 distribution was detected at the unsynapsed segments of the rodent X chromosomes. BRCA1 was shown to be highly conserved only within certain mammalian taxa. It was also noted that in those rodent nuclei, where BRCA1 specifically binds to antigens, asynaptic regions of sex chromosomes were positive. BRCA1 staining was not always accompanied by specific binding, and a high nonspecificity in the nucleoplasm was observed. Thus, the studies revealed different conservation of the two enzymes at the level of protein structure as well as at the level of chromosome behavior. This suggests variable rates of evolution due to both size and configuration of the protein molecules and their multifunctionality.
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Affiliation(s)
- Sergey Matveevsky
- Laboratory of Cytogenetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia
| | - Tatiana Grishaeva
- Laboratory of Cytogenetics, Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia
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8
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Ju C, Zhang M, Guan M, Li S, Zhang Y, Zhao J, Gao X. Fast and efficient generation of a full-length balancer chromosome by a single Cre/loxP recombination event. Mamm Genome 2021; 33:169-180. [PMID: 34386878 DOI: 10.1007/s00335-021-09897-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/14/2021] [Indexed: 11/28/2022]
Abstract
Balancer chromosomes, primarily discovered and used in Drosophila melanogaster, are valuable tools to maintain lethal mutations in a particular genomic segment. Full-length balancer chromosomes would be particularly useful because of the capacity to maintain whole genomic traits. However, murine full-length balancer chromosomes generated via a single Cre/loxP recombination are still not demonstrated. In this study, we developed a novel mouse strain with full-length inverted chromosome 17 (Ch17Inv balancer) via a single Cre/loxP recombination event in mES cells. The Ch17Inv balancer mice are viable and phenotypically normal. When bred with other strains, the haplotype of chromosome 17 can be stably maintained as determined by the high throughput SNPs assay. Interestingly, we found that the recombination events were efficiently reduced within the inverted region but not eliminated. The method established in this study can be applied to generate other full-length balancer chromosomes. Moreover, the Ch17Inv balancer strain would be a valuable resource to maintain the entire chromosome 17 from different donor strains.
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Affiliation(s)
- Cunxiang Ju
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China.
| | - Mingkun Zhang
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China
| | - Min Guan
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China
| | - Song Li
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China
| | - Yuxi Zhang
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China
| | - Jing Zhao
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China
| | - Xiang Gao
- GemPharmatech Co., Ltd., Xuefu Rd. 12#, Jiangbei New Area, Nanjing, China.
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9
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Brandeis M. Were eukaryotes made by sex?: Sex might have been vital for merging endosymbiont and host genomes giving rise to eukaryotes. Bioessays 2021; 43:e2000256. [PMID: 33860546 DOI: 10.1002/bies.202000256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 03/16/2021] [Accepted: 03/17/2021] [Indexed: 11/10/2022]
Abstract
I hypothesize that the appearance of sex facilitated the merging of the endosymbiont and host genomes during early eukaryote evolution. Eukaryotes were formed by symbiosis between a bacterium that entered an archaeon, eventually giving rise to mitochondria. This entry was followed by the gradual transfer of most bacterial endosymbiont genes into the archaeal host genome. I argue that the merging of the mitochondrial genes into the host genome was vital for the evolution of genuine eukaryotes. At the time this process commenced it was unprecedented and required a novel mechanism. I suggest that this mechanism was meiotic sex, and that its appearance might have been THE crucial step that enabled the evolution of proper eukaryotes from early endosymbiont containing proto-eukaryotes. Sex might continue to be essential today for keeping genome insertions in check. Also see the video abstract here: https://youtu.be/aVMvWMpomac.
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Affiliation(s)
- Michael Brandeis
- The Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
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10
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Liu S, Hua Y, Wang J, Li L, Yuan J, Zhang B, Wang Z, Ji J, Kong D. RNA polymerase III is required for the repair of DNA double-strand breaks by homologous recombination. Cell 2021; 184:1314-1329.e10. [PMID: 33626331 DOI: 10.1016/j.cell.2021.01.048] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 09/24/2020] [Accepted: 01/26/2021] [Indexed: 12/22/2022]
Abstract
End resection in homologous recombination (HR) and HR-mediated repair of DNA double-strand breaks (DSBs) removes several kilobases from 5' strands of DSBs, but 3' strands are exempted from degradation. The mechanism by which the 3' overhangs are protected has not been determined. Here, we established that the protection of 3' overhangs is achieved through the transient formation of RNA-DNA hybrids. The DNA strand in the hybrids is the 3' ssDNA overhang, while the RNA strand is newly synthesized. RNA polymerase III (RNAPIII) is responsible for synthesizing the RNA strand. Furthermore, RNAPIII is actively recruited to DSBs by the MRN complex. CtIP and MRN nuclease activity is required for initiating the RNAPIII-mediated RNA synthesis at DSBs. A reduced level of RNAPIII suppressed HR, and genetic loss > 30 bp increased at DSBs. Thus, RNAPIII is an essential HR factor, and the RNA-DNA hybrid is an essential repair intermediate for protecting the 3' overhangs in DSB repair.
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Affiliation(s)
- Sijie Liu
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Yu Hua
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Jingna Wang
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Lingyan Li
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Junjie Yuan
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Bo Zhang
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Ziyang Wang
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Jianguo Ji
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China
| | - Daochun Kong
- Peking-Tsinghua Center for Life Sciences, The National Laboratory of Protein and Plant Gene research, College of Life Sciences, Peking University, Beijing 100871, China.
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11
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Furman CM, Elbashir R, Alani E. Expanded roles for the MutL family of DNA mismatch repair proteins. Yeast 2020; 38:39-53. [PMID: 32652606 DOI: 10.1002/yea.3512] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/01/2020] [Accepted: 07/08/2020] [Indexed: 12/31/2022] Open
Abstract
The MutL family of DNA mismatch repair proteins plays a critical role in excising and repairing misincorporation errors during DNA replication. In many eukaryotes, members of this family have evolved to modulate and resolve recombination intermediates into crossovers during meiosis. In these organisms, such functions promote the accurate segregation of chromosomes during the meiosis I division. What alterations occurred in MutL homolog (MLH) family members that enabled them to acquire these new roles? In this review, we present evidence that the yeast Mlh1-Mlh3 and Mlh1-Mlh2 complexes have evolved novel enzymatic and nonenzymatic activities and protein-protein interactions that are critical for their meiotic functions. Curiously, even with these changes, these complexes retain backup and accessory roles in DNA mismatch repair during vegetative growth.
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Affiliation(s)
- Christopher M Furman
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
| | - Ryan Elbashir
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
| | - Eric Alani
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
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12
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Sun S, White RR, Fischer KE, Zhang Z, Austad SN, Vijg J. Inducible aging in Hydra oligactis implicates sexual reproduction, loss of stem cells, and genome maintenance as major pathways. GeroScience 2020; 42:1119-1132. [PMID: 32578072 DOI: 10.1007/s11357-020-00214-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 06/04/2020] [Indexed: 02/07/2023] Open
Abstract
Freshwater polyps of the genus Hydra do not age. However, temperature stress induces aging and a shift from reproduction by asexual budding to sexual gamete production in a cold-sensitive (CS) strain of H. oligactis. We sequenced the transcriptome of a male CS strain before and after this life history shift and compared changes in gene expression relative to those seen in a cold-resistant (CR) strain that does not undergo a life history shift in response to altered temperature. We found that the switch from non-aging asexual reproduction to aging and sexual reproduction involves upregulation of genes not only involved in gametogenesis but also genes involved in cellular senescence, apoptosis, and DNA repair accompanied by a downregulation of genes involved in stem cell maintenance. These results suggest that aging is a byproduct of sexual reproduction-associated cellular reprogramming and underscore the power of these H. oligactis strains to identify intrinsic mechanisms of aging.
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Affiliation(s)
- Shixiang Sun
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Ryan R White
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.,Laboratory of Genome Maintenance, The Rockefeller University, New York, NY, 10065, USA
| | - Kathleen E Fischer
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Zhengdong Zhang
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
| | - Steven N Austad
- Department of Biology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
| | - Jan Vijg
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, 10461, USA. .,Center for Single-Cell Omics, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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13
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Bogdanov YF, Grishaeva TM. Meiotic Recombination. The Metabolic Pathways from DNA Double-Strand Breaks to Crossing Over and Chiasmata. RUSS J GENET+ 2020. [DOI: 10.1134/s1022795420020039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Maciver SK. Ancestral Eukaryotes Reproduced Asexually, Facilitated by Polyploidy: A Hypothesis. Bioessays 2019; 41:e1900152. [DOI: 10.1002/bies.201900152] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/10/2019] [Indexed: 12/29/2022]
Affiliation(s)
- Sutherland K. Maciver
- Centre for Discovery Brain Sciences, Edinburgh Medical SchoolBiomedical SciencesUniversity of Edinburgh Hugh Robson Building, George Square Edinburgh EH8 9XD Scotland UK
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15
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Abstract
During meiosis, programmed double-strand breaks (DSBs) are repaired via recombination pathways that are required for faithful chromosomal segregation and genetic diversity. In meiotic progression, the non-homologous end joining (NHEJ) pathway is suppressed and instead meiotic recombination initiated by nucleolytic resection of DSB ends is the major pathway employed. This requires diverse recombinase proteins and regulatory factors involved in the formation of crossovers (COs) and non-crossovers (NCOs). In mitosis, spontaneous DSBs occurring at the G1 phase are predominantly repaired via NHEJ, mediating the joining of DNA ends. The Ku complex binds to these DSB ends, inhibiting additional DSB resection and mediating end joining with Dnl4, Lif1, and Nej1, which join the Ku complex and DSB ends. Here, we report the role of the Ku complex in DSB repair using a physical analysis of recombination in Saccharomyces cerevisiae during meiosis. We found that the Ku complex is not essential for meiotic progression, DSB formation, joint molecule formation, or CO/NCO formation during normal meiosis. Surprisingly, in the absence of the Ku complex and functional Mre11-Rad50-Xrs2 (MRX) complex, a large portion of meiotic DSBs was repaired via the recombination pathway to form COs and NCOs. Our data suggested that Ku complex prevents meiotic recombination in the elimination of MRX activity.
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Affiliation(s)
- Hyeseon Yun
- Department of Life Science, Chung-Ang University, Seoul 06974, Korea
| | - Keunpil Kim
- Department of Life Science, Chung-Ang University, Seoul 06974, Korea
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16
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Palmer N, Talib SZA, Kaldis P. Diverse roles for CDK-associated activity during spermatogenesis. FEBS Lett 2019; 593:2925-2949. [PMID: 31566717 PMCID: PMC6900092 DOI: 10.1002/1873-3468.13627] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/20/2019] [Accepted: 09/26/2019] [Indexed: 12/22/2022]
Abstract
The primary function of cyclin-dependent kinases (CDKs) in complex with their activating cyclin partners is to promote mitotic division in somatic cells. This canonical cell cycle-associated activity is also crucial for fertility as it allows the proliferation and differentiation of stem cells within the reproductive organs to generate meiotically competent cells. Intriguingly, several CDKs exhibit meiosis-specific functions and are essential for the completion of the two reductional meiotic divisions required to generate haploid gametes. These meiosis-specific functions are mediated by both known CDK/cyclin complexes and meiosis-specific CDK-regulators and are important for a variety of processes during meiotic prophase. The majority of meiotic defects observed upon deletion of these proteins occur during the extended prophase I of the first meiotic division. Importantly a lack of redundancy is seen within the meiotic arrest phenotypes described for many of these proteins, suggesting intricate layers of cell cycle control are required for normal meiotic progression. Using the process of male germ cell development (spermatogenesis) as a reference, this review seeks to highlight the diverse roles of selected CDKs their activators, and their regulators during gametogenesis.
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Affiliation(s)
- Nathan Palmer
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, National University of Singapore (NUS), Singapore, Singapore
| | - S Zakiah A Talib
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Philipp Kaldis
- Institute of Molecular and Cell Biology (IMCB), A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.,Department of Biochemistry, National University of Singapore (NUS), Singapore, Singapore.,Department of Clinical Sciences, Clinical Research Centre (CRC), Lund University, Malmö, Sweden
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17
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Rozhok A, DeGregori J. Somatic maintenance impacts the evolution of mutation rate. BMC Evol Biol 2019; 19:172. [PMID: 31443631 PMCID: PMC6708161 DOI: 10.1186/s12862-019-1496-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 08/14/2019] [Indexed: 12/11/2022] Open
Abstract
Background The evolution of multi-cellular animals has produced a conspicuous trend toward increased body size. This trend has introduced at least two novel problems: an expected elevated risk of somatic disorders, such as cancer, and declining evolvability due to generally reduced population size, lower reproduction rate and extended generation time. Low population size is widely recognized to explain the high mutation rates in animals by limiting the presumed universally negative selection acting on mutation rates. Results Here, we present evidence from stochastic modeling that the direction and strength of selection acting on mutation rates is highly dependent on the evolution of somatic maintenance, and thus longevity, which modulates the cost of somatic mutations. Conclusions We argue that the impact of the evolution of longevity on mutation rates may have been critical in facilitating animal evolution. Electronic supplementary material The online version of this article (10.1186/s12862-019-1496-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andrii Rozhok
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, 80045, USA.
| | - James DeGregori
- Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine, Aurora, CO, 80045, USA. .,Integrated Department of Immunology, University of Colorado School of Medicine, Aurora, CO, 80045, USA. .,Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, 80045, USA. .,Department of Medicine, Section of Hematology, University of Colorado School of Medicine, Aurora, CO, 80045, USA.
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18
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Hong S, Joo JH, Yun H, Kim K. The nature of meiotic chromosome dynamics and recombination in budding yeast. J Microbiol 2019; 57:221-231. [PMID: 30671743 DOI: 10.1007/s12275-019-8541-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 10/24/2018] [Accepted: 10/26/2018] [Indexed: 12/28/2022]
Abstract
During meiosis, crossing over allows for the exchange of genes between homologous chromosomes, enabling their segregation and leading to genetic variation in the resulting gametes. Spo11, a topoisomerase-like protein expressed in eukaryotes, and diverse accessory factors induce programmed double-strand breaks (DSBs) to initiate meiotic recombination during the early phase of meiosis after DNA replication. DSBs are further repaired via meiosis-specific homologous recombination. Studies on budding yeast have provided insights into meiosis and genetic recombination and have improved our understanding of higher eukaryotic systems. Cohesin, a chromosome-associated multiprotein complex, mediates sister chromatid cohesion (SCC), and is conserved from yeast to humans. Diverse cohesin subunits in budding yeast have been identified in DNA metabolic pathways, such as DNA replication, chromosome segregation, recombination, DNA repair, and gene regulation. During cell cycle, SCC is established by multiple cohesin subunits, which physically bind sister chromatids together and modulate proteins that involve in the capturing and separation of sister chromatids. Cohesin components include at least four core subunits that establish and maintain SCC: two structural maintenance chromosome subunits (Smc1 and Smc3), an α-kleisin subunit (Mcd1/Scc1 during mitosis and Rec8 during meiosis), and Scc3/Irr1 (SA1 and SA2). In addition, the cohesin-associated factors Pds5 and Rad61 regulate structural modifications and cell cyclespecific dynamics of chromatin to ensure accurate chromosome segregation. In this review, we discuss SCC and the recombination pathway, as well as the relationship between the two processes in budding yeast, and we suggest a possible conserved mechanism for meiotic chromosome dynamics from yeast to humans.
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Affiliation(s)
- Soogil Hong
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Jeong Hwan Joo
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Hyeseon Yun
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Keunpil Kim
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea.
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19
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Conservation of meiosis-specific nuclear proteins in eukaryotes: a comparative approach. THE NUCLEUS 2018. [DOI: 10.1007/s13237-018-0253-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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20
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Lenormand T, Engelstädter J, Johnston SE, Wijnker E, Haag CR. Evolutionary mysteries in meiosis. Philos Trans R Soc Lond B Biol Sci 2017; 371:rstb.2016.0001. [PMID: 27619705 DOI: 10.1098/rstb.2016.0001] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/15/2016] [Indexed: 01/25/2023] Open
Abstract
Meiosis is a key event of sexual life cycles in eukaryotes. Its mechanistic details have been uncovered in several model organisms, and most of its essential features have received various and often contradictory evolutionary interpretations. In this perspective, we present an overview of these often 'weird' features. We discuss the origin of meiosis (origin of ploidy reduction and recombination, two-step meiosis), its secondary modifications (in polyploids or asexuals, inverted meiosis), its importance in punctuating life cycles (meiotic arrests, epigenetic resetting, meiotic asymmetry, meiotic fairness) and features associated with recombination (disjunction constraints, heterochiasmy, crossover interference and hotspots). We present the various evolutionary scenarios and selective pressures that have been proposed to account for these features, and we highlight that their evolutionary significance often remains largely mysterious. Resolving these mysteries will likely provide decisive steps towards understanding why sex and recombination are found in the majority of eukaryotes.This article is part of the themed issue 'Weird sex: the underappreciated diversity of sexual reproduction'.
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Affiliation(s)
- Thomas Lenormand
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)-Unité Mixte de Recherche 5175, Centre National de la Recherche Scientifique (CNRS), Université de Montpellier-Université Paul-Valéry Montpellier-Ecole Pratique des Hautes Etudes (EPHE), 1919 Route de Mende, 34293 Montpellier Cedex 5, France
| | - Jan Engelstädter
- School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Susan E Johnston
- Institute of Evolutionary Biology, University of Edinburgh, Charlotte Auerbach Road, Edinburgh EH9 3FL, UK
| | - Erik Wijnker
- Laboratory of Genetics, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
| | - Christoph R Haag
- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE)-Unité Mixte de Recherche 5175, Centre National de la Recherche Scientifique (CNRS), Université de Montpellier-Université Paul-Valéry Montpellier-Ecole Pratique des Hautes Etudes (EPHE), 1919 Route de Mende, 34293 Montpellier Cedex 5, France
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21
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Gunes S, Agarwal A, Henkel R, Mahmutoglu AM, Sharma R, Esteves SC, Aljowair A, Emirzeoglu D, Alkhani A, Pelegrini L, Joumah A, Sabanegh E. Association between promoter methylation of MLH1
and MSH2
and reactive oxygen species in oligozoospermic men-A pilot study. Andrologia 2017; 50. [DOI: 10.1111/and.12903] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/02/2017] [Indexed: 01/21/2023] Open
Affiliation(s)
- S. Gunes
- Medical Biology; Ondokuz Mayis University; Samsun Turkey
- Molecular Medicine; Ondokuz Mayis University; Samsun Turkey
| | - A. Agarwal
- Cleveland Clinic; American Center for Reproductive Medicine; Cleveland OH USA
| | - R. Henkel
- Department of Medical Bioscience; University of Western Cape; Bellville South Africa
| | | | - R. Sharma
- Cleveland Clinic; American Center for Reproductive Medicine; Cleveland OH USA
| | - S. C. Esteves
- ANDROFERT; Andrology and Human Reproduction Clinic; Campinas Brazil
| | - A. Aljowair
- Prince Sattam bin Abdulaziz University; Al-Kharj Saudi Arabia
| | - D. Emirzeoglu
- Molecular Medicine; Ondokuz Mayis University; Samsun Turkey
| | - A. Alkhani
- Alfaisal University; Riyadh Saudi Arabia
| | | | - A. Joumah
- Prince Sattam bin Abdulaziz University; Al-Kharj Saudi Arabia
| | - E. Sabanegh
- Department of Urology; Cleveland Clinic; Cleveland OH USA
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22
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So similar yet so different: The two ends of a double strand break. Mutat Res 2017; 809:70-80. [PMID: 28693746 DOI: 10.1016/j.mrfmmm.2017.06.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 06/21/2017] [Accepted: 06/26/2017] [Indexed: 11/22/2022]
Abstract
Homologous recombination (HR) is essential for ensuring proper segregation of chromosomes in the first round of meiotic division. HR is also crucial for preserving genomic integrity of somatic cells due to its ability to rescue collapsed replication forks and eliminate deleterious DNA lesions, such as double-strand breaks (DSBs), interstrand crosslinks, and single-strand DNA gaps. Here, we review the early steps of HR (homology search and strand exchange), focusing on the roles of the two ends of a DSB. A detailed overview of the basic HR machinery and its mechanism for template selection and capture of duplex DNA via strand exchange is provided. Roles of proteins involved in these steps are discussed in both mitotic and meiotic HR. Central to this review is the hypothesis, which suggests that in meiosis, HR begins with a symmetrical DSB, but the symmetry is quickly lost with the two ends assuming different roles; it argues that this disparity of the two ends is essential for regulation of HR in meiosis and successful production of haploid gametes. We also propose a possible evolutionary reason for the asymmetry of the ends in HR.
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23
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Grishaeva TM, Bogdanov YF. Evolutionary conservation of recombination proteins and variability of meiosis-specific proteins of chromosomes. RUSS J GENET+ 2017. [DOI: 10.1134/s1022795417040081] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Grishaeva TM, Kulichenko D, Bogdanov YF. Bioinformatical analysis of eukaryotic shugoshins reveals meiosis-specific features of vertebrate shugoshins. PeerJ 2016; 4:e2736. [PMID: 27917322 PMCID: PMC5134366 DOI: 10.7717/peerj.2736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 10/31/2016] [Indexed: 11/24/2022] Open
Abstract
Background Shugoshins (SGOs) are proteins that protect cohesins located at the centromeres of sister chromatids from their early cleavage during mitosis and meiosis in plants, fungi, and animals. Their function is to prevent premature sister-chromatid disjunction and segregation. The study focused on the structural differences among SGOs acting during mitosis and meiosis that cause differences in chromosome behavior in these two types of cell division in different organisms. Methods A bioinformatical analysis of protein domains, conserved amino acid motifs, and physicochemical properties of 32 proteins from 25 species of plants, fungi, and animals was performed. Results We identified a C-terminal amino acid motif that is highly evolutionarily conserved among the SGOs protecting centromere cohesion of sister chromatids in meiotic anaphase I, but not among mitotic SGOs. This meiotic motif is arginine-rich in vertebrates. SGOs differ in different eukaryotic kingdoms by the sets and locations of amino acid motifs and the number of α-helical regions in the protein molecule. Discussion These structural differences between meiotic and mitotic SGOs probably could be responsible for the prolonged SGOs resistance to degradation during meiotic metaphase I and anaphase I. We suggest that the “arginine comb” in C-end meiotic motifs is capable of interaction by hydrogen bonds with guanine bases in the minor groove of DNA helix, thus protecting SGOs from hydrolysis. Our findings support independent evolution of meiosis in different lineages of multicellular organisms.
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Affiliation(s)
- Tatiana M Grishaeva
- Laboratory of Cytogenetics, Department of Genomics and Human Genetics, N.I. Vavilov Institute of General Genetics , Moscow , Russia
| | - Darya Kulichenko
- Laboratory of Cytogenetics, Department of Genomics and Human Genetics, N.I. Vavilov Institute of General Genetics , Moscow , Russia
| | - Yuri F Bogdanov
- Laboratory of Cytogenetics, Department of Genomics and Human Genetics, N.I. Vavilov Institute of General Genetics , Moscow , Russia
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25
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Bogdanov YF. Inverted meiosis and its place in the evolution of sexual reproduction pathways. RUSS J GENET+ 2016. [DOI: 10.1134/s1022795416050033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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26
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Jiang C, Starr S, Chen F, Wu J. Low-fidelity alternative DNA repair carcinogenesis theory may interpret many cancer features and anticancer strategies. Future Oncol 2016; 12:1897-910. [PMID: 27166654 DOI: 10.2217/fon-2016-0066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have proposed that the low-fidelity compensatory backup alternative DNA repair pathways drive multistep carcinogenesis. Here, we apply it to interpret the clinical features of cancer, such as mutator phenotype, tissue specificity, age specificity, diverse types of cancers originated from the same type of tissue, cancer susceptibility of patients with DNA repair-defective syndromes, development of cancer only for a selected number of individuals among those that share the same genetic defect, invasion and metastasis. Clinically, the theory predicts that to improve the efficacy of molecular targeted or synthetic lethal therapy, it may be crucial to inhibit the low-fidelity compensatory alternative DNA repair either directly or by blocking the signal transducers of the sustained microenvironmental stress.
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Affiliation(s)
- Chuo Jiang
- School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China.,Central Laboratories, Xuhui Central Hospital, Shanghai Clinical Center, Chinese Academy of Sciences, 966 Middle Huaihai Road, Shanghai 200031, China
| | - Shane Starr
- Department of Pathology & Laboratory Medicine, Brody School of Medicine, East Carolina University, 600 Moye Boulevard, Greenville, North Carolina 27834, USA and currently Flint Medical Laboratory, 3490 Calkins Road, Flint, MI 48532, USA
| | - Fuxue Chen
- School of Life Sciences, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Jiaxi Wu
- Central Laboratories, Xuhui Central Hospital, Shanghai Clinical Center, Chinese Academy of Sciences, 966 Middle Huaihai Road, Shanghai 200031, China.,Department of Pathology & Laboratory Medicine, Brody School of Medicine, East Carolina University, 600 Moye Boulevard, Greenville, North Carolina 27834, USA and currently Flint Medical Laboratory, 3490 Calkins Road, Flint, MI 48532, USA
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27
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Lyons NA, Kolter R. On the evolution of bacterial multicellularity. Curr Opin Microbiol 2015; 24:21-8. [PMID: 25597443 DOI: 10.1016/j.mib.2014.12.007] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 12/10/2014] [Accepted: 12/30/2014] [Indexed: 01/17/2023]
Abstract
Multicellularity is one of the most prevalent evolutionary innovations and nowhere is this more apparent than in the bacterial world, which contains many examples of multicellular organisms in a surprising array of forms. Due to their experimental accessibility and the large and diverse genomic data available, bacteria enable us to probe fundamental aspects of the origins of multicellularity. Here we discuss examples of multicellular behaviors in bacteria, the selective pressures that may have led to their evolution, possible origins and intermediate stages, and whether the ubiquity of apparently convergent multicellular forms argues for its inevitability.
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Affiliation(s)
- Nicholas A Lyons
- Department of Microbiology and Immunobiology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, United States
| | - Roberto Kolter
- Department of Microbiology and Immunobiology, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, United States.
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28
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Zhang Z, Cai Z, Li K, Fang Y, An L, Hu Z, Wang S, Hang H. The Effect of Ionizing Radiation on mRNA Levels of the DNA Damage Response Genes Rad9, Rad1 and Hus1 in Various Mouse Tissues. Radiat Res 2015; 183:94-104. [DOI: 10.1667/rr13781.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zhenya Zhang
- Department of General Surgery, the Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, 050011 China
| | - Zeyuan Cai
- Center for Peptide and Protein Pharmaceuticals, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Kaiming Li
- Department of General Surgery, the Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, 050011 China
| | - Yu Fang
- Center for Peptide and Protein Pharmaceuticals, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Lili An
- Center for Peptide and Protein Pharmaceuticals, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Zhishang Hu
- Center for Peptide and Protein Pharmaceuticals, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Shihua Wang
- School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Haiying Hang
- Center for Peptide and Protein Pharmaceuticals, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
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29
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Niklas KJ, Cobb ED, Kutschera U. Did meiosis evolve before sex and the evolution of eukaryotic life cycles? Bioessays 2014; 36:1091-101. [PMID: 25143284 DOI: 10.1002/bies.201400045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Biologists have long theorized about the evolution of life cycles, meiosis, and sexual reproduction. We revisit these topics and propose that the fundamental difference between life cycles is where and when multicellularity is expressed. We develop a scenario to explain the evolutionary transition from the life cycle of a unicellular organism to one in which multicellularity is expressed in either the haploid or diploid phase, or both. We propose further that meiosis might have evolved as a mechanism to correct for spontaneous whole-genome duplication (auto-polyploidy) and thus before the evolution of sexual reproduction sensu stricto (i.e. the formation of a diploid zygote via the fusion of haploid gametes) in the major eukaryotic clades. In addition, we propose, as others have, that sexual reproduction, which predominates in all eukaryotic clades, has many different advantages among which is that it produces variability among offspring and thus reduces sibling competition.
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Affiliation(s)
- Karl J Niklas
- Section of Plant Biology, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA
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30
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Abstract
Sexual reproduction is a nearly universal feature of eukaryotic organisms. Given its ubiquity and shared core features, sex is thought to have arisen once in the last common ancestor to all eukaryotes. Using the perspectives of molecular genetics and cell biology, we consider documented and hypothetical scenarios for the instantiation and evolution of meiosis, fertilization, sex determination, uniparental inheritance of organelle genomes, and speciation.
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Affiliation(s)
- Ursula Goodenough
- Department of Biology, Washington University, St. Louis, Missouri 63130
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31
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Defying DNA double-strand break-induced death during prophase I meiosis by temporal TAp63α phosphorylation regulation in developing mouse oocytes. Mol Cell Biol 2014; 34:1460-73. [PMID: 24515437 DOI: 10.1128/mcb.01223-13] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The dichotomy in DNA damage sensitivity of developing mouse oocytes during female germ line development is striking. Embryonic oocytes withstand hundreds of programmed DNA double-strand breaks (DSBs) required for meiotic recombination. Postnatal immature oocytes fail to tolerate even a few DSBs induced by gamma radiation treatment. TAp63α, a p53 family member, undergoes phosphorylation and mediates postnatal immature oocyte death following gamma radiation treatment, which is thought important for germ line quality maintenance. Whether prenatal meiotic oocytes tolerate DNA DSBs simply because they lack TAp63α expression is not clear. We found a significant number of oocytes in newborn mice initiate TAp63α expression and simultaneously carry meiotic DNA DSBs. However, the risk of premature death appears unlikely, because newborn oocytes strongly abate TAp63α phosphorylation induction and resist normally lethal doses of ionizing radiation damage. A calyculin A-sensitive Ser/Thr phosphatase activity downregulates TAp63α phosphorylation and ATM kinase mediates phosphorylation. Possible alterations in the relative balance of these counteracting activities during development may first temper TAp63α phosphorylation and death induction during meiotic DNA DSB repair and recombination, and afterward, implement germ line quality control in later stages. Insights into inherent DNA DSB resistance mechanisms in newborn oocytes may help prevent infertility in women in need of radiation or chemotherapy.
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32
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Abstract
Substitution rates vary between species, and many explanations regarding the causes of this variation have been proposed. Here we consider how new genomic data on the per-generation mutation rate impinge on proposed hypotheses for substitution rate variation in primates. We propose that the generation-time effect as it is usually understood cannot explain the observed rate variation, but instead that selection for decreased somatic mutation rates can. By considering the disparate causes underlying mutation rate changes in recent human history, we also show that the per-generation mutation rate is increasing even as the per-cell-division rate is decreasing.
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33
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Potential role of meiosis proteins in melanoma chromosomal instability. J Skin Cancer 2013; 2013:190109. [PMID: 23840955 PMCID: PMC3694528 DOI: 10.1155/2013/190109] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 05/21/2013] [Indexed: 12/05/2022] Open
Abstract
Melanomas demonstrate chromosomal instability (CIN). In fact, CIN can be used to differentiate melanoma from benign nevi. The exact molecular mechanisms that drive CIN in melanoma have yet to be fully elucidated. Cancer/testis antigens are a unique group of germ cell proteins that are found to be primarily expressed in melanoma as compared to benign nevi. The abnormal expression of these germ cell proteins, normally expected only in the testis and ovaries, in somatic cells may lead to interference with normal cellular pathways. Germ cell proteins that may be particularly critical in CIN are meiosis proteins. Here, we review pathways unique to meiosis with a focus on how the aberrant expression of meiosis proteins in normal mitotic cells “meiomitosis” could impact chromosomal instability in melanoma and other cancers.
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34
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Kohl KP, Sekelsky J. Meiotic and mitotic recombination in meiosis. Genetics 2013; 194:327-34. [PMID: 23733849 PMCID: PMC3664844 DOI: 10.1534/genetics.113.150581] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 03/21/2013] [Indexed: 11/18/2022] Open
Abstract
Meiotic crossovers facilitate the segregation of homologous chromosomes and increase genetic diversity. The formation of meiotic crossovers was previously posited to occur via two pathways, with the relative use of each pathway varying between organisms; however, this paradigm could not explain all crossovers, and many of the key proteins involved were unidentified. Recent studies that identify some of these proteins reinforce and expand the model of two meiotic crossover pathways. The results provide novel insights into the evolutionary origins of the pathways, suggesting that one is similar to a mitotic DNA repair pathway and the other evolved to incorporate special features unique to meiosis.
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Affiliation(s)
- Kathryn P. Kohl
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Jeff Sekelsky
- Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, North Carolina 27599
- Department of Biology, University of North Carolina, Chapel Hill, North Carolina 27599
- Program in Molecular Biology and Biotechnology, University of North Carolina, Chapel Hill, North Carolina 27599
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35
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Novotná E, Tichý A, Pejchal J, Lukášová E, Salovská B, Vávrová J. DNA-dependent protein kinase and its inhibition in support of radiotherapy. Int J Radiat Biol 2013; 89:416-23. [PMID: 23362996 DOI: 10.3109/09553002.2013.767993] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
PURPOSE Radiotherapy has been used as a treatment of almost 50% of all malignant tumors. The aim of this review is to provide a comprehensive overview of the recent knowledge in the field of molecular mechanisms of radiation-induced double-stranded breaks (DSB) repair. This paper gives particular emphasis to a key DNA repair enzyme, DNA-dependent protein kinase (DNA-PK), which plays a pivotal role in non-homologous end-joining. Furthermore, we discuss possibilities of DNA-PK inhibition and other molecular approaches employed in order to facilitate radiotherapy. CONCLUSIONS We have reviewed the recent studies using novel potent and selective small-molecular DNA-PK inhibitors and we conclude that targeted inhibition of DNA repair proteins like DNA-PK in cancer cells, in combination with ionizing radiation, improves the efficacy of cancer therapy while minimizing side-effects of ionizing radiation. Moreover, the recent discovery of short interfering RNA (siRNA) and signal interfering DNA (siDNA)-based therapeutics, or small peptides and RNA, shows a new opportunity of selective and safe application of biological treatment. All of these approaches are believed to contribute to more personalized anti-cancer therapy.
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Affiliation(s)
- Eva Novotná
- Department of Radiation Biology, Faculty of Military Health Sciences, University of Defence, Hradec Králové, Czech Republic
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36
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AIDing antibody diversity by error-prone mismatch repair. Semin Immunol 2012; 24:293-300. [PMID: 22703640 DOI: 10.1016/j.smim.2012.05.005] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 05/18/2012] [Indexed: 11/20/2022]
Abstract
The creation of a highly diverse antibody repertoire requires the synergistic activity of a DNA mutator, known as activation-induced deaminase (AID), coupled with an error-prone repair process that recognizes the DNA mismatch catalyzed by AID. Instead of facilitating the canonical error-free response, which generally occurs throughout the genome, DNA mismatch repair (MMR) participates in an error-prone repair mode that promotes A:T mutagenesis and double-strand breaks at the immunoglobulin (Ig) genes. As such, MMR is capable of compounding the mutation frequency of AID activity as well as broadening the spectrum of base mutations; thereby increasing the efficiency of antibody maturation. We here review the current understanding of this MMR-mediated process and describe how the MMR signaling cascade downstream of AID diverges in a locus dependent manner and even within the Ig locus itself to differentially promote somatic hypermutation (SHM) and class switch recombination (CSR) in B cells.
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Jan SZ, Hamer G, Repping S, de Rooij DG, van Pelt AMM, Vormer TL. Molecular control of rodent spermatogenesis. Biochim Biophys Acta Mol Basis Dis 2012; 1822:1838-50. [PMID: 22366765 DOI: 10.1016/j.bbadis.2012.02.008] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/03/2012] [Accepted: 02/06/2012] [Indexed: 12/29/2022]
Abstract
Spermatogenesis is a complex developmental process that ultimately generates mature spermatozoa. This process involves a phase of proliferative expansion, meiosis, and cytodifferentiation. Mouse models have been widely used to study spermatogenesis and have revealed many genes and molecular mechanisms that are crucial in this process. Although meiosis is generally considered as the most crucial phase of spermatogenesis, mouse models have shown that pre-meiotic and post-meiotic phases are equally important. Using knowledge generated from mouse models and in vitro studies, the current review provides an overview of the molecular control of rodent spermatogenesis. Finally, we briefly relate this knowledge to fertility problems in humans and discuss implications for future research. This article is part of a Special Issue entitled: Molecular Genetics of Human Reproductive Failure.
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Affiliation(s)
- Sabrina Z Jan
- Center for Reproductive Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Chahwan R, Edelmann W, Scharff MD, Roa S. Mismatch-mediated error prone repair at the immunoglobulin genes. Biomed Pharmacother 2011; 65:529-36. [PMID: 22100214 DOI: 10.1016/j.biopha.2011.09.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
Abstract
The generation of effective antibodies depends upon somatic hypermutation (SHM) and class-switch recombination (CSR) of antibody genes by activation induced cytidine deaminase (AID) and the subsequent recruitment of error prone base excision and mismatch repair. While AID initiates and is required for SHM, more than half of the base changes that accumulate in V regions are not due to the direct deamination of dC to dU by AID, but rather arise through the recruitment of the mismatch repair complex (MMR) to the U:G mismatch created by AID and the subsequent perversion of mismatch repair from a high fidelity process to one that is very error prone. In addition, the generation of double-strand breaks (DSBs) is essential during CSR, and the resolution of AID-generated mismatches by MMR to promote such DSBs is critical for the efficiency of the process. While a great deal has been learned about how AID and MMR cause hypermutations and DSBs, it is still unclear how the error prone aspect of these processes is largely restricted to antibody genes. The use of knockout models and mice expressing mismatch repair proteins with separation-of-function point mutations have been decisive in gaining a better understanding of the roles of each of the major MMR proteins and providing further insight into how mutation and repair are coordinated. Here, we review the cascade of MMR factors and repair signals that are diverted from their canonical error free role and hijacked by B cells to promote genetic diversification of the Ig locus. This error prone process involves AID as the inducer of enzymatically-mediated DNA mismatches, and a plethora of downstream MMR factors acting as sensors, adaptors and effectors of a complex and tightly regulated process from much of which is not yet well understood.
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Affiliation(s)
- Richard Chahwan
- Department of Cell Biology, Albert Einstein College of Medicine, 1300 Morris Park Ave-Chanin 404, Bronx, NY 10461, United States
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Refolio E, Cavero S, Marcon E, Freire R, San-Segundo PA. The Ddc2/ATRIP checkpoint protein monitors meiotic recombination intermediates. J Cell Sci 2011; 124:2488-500. [PMID: 21693576 DOI: 10.1242/jcs.081711] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
During meiosis, accurate segregation of intact chromosomes is essential for generating healthy gametes. Defects in recombination and/or chromosome synapsis activate the pachytene checkpoint, which delays meiotic cell cycle progression to avoid aberrant chromosome segregation and formation of defective gametes. Here, we characterize the role of the conserved DNA damage checkpoint protein Ddc2/ATRIP in this meiotic surveillance mechanism. We show that deletion of DDC2 relieves the checkpoint-dependent meiotic block that occurs in Saccharomyces cerevisiae mutants defective in various aspects of meiotic chromosome dynamics and results in the generation of faulty meiotic products. Moreover, production of the Ddc2 protein is induced during meiotic prophase, accumulates in checkpoint-arrested mutants and localizes to distinctive chromosomal foci. Formation of meiotic Ddc2 foci requires the generation of Spo11-dependent DNA double-strand breaks (DSBs), and is impaired in an RPA mutant. Chromatin immunoprecipitation analysis reveals that Ddc2 accumulates at meiotic DSB sites, indicating that Ddc2 senses the presence of meiotic recombination intermediates. Furthermore, pachytene checkpoint signaling is defective in the ddc2 mutant. In addition, we show that mammalian ATRIP colocalizes with ATR, TopBP1 and RPA at unsynapsed regions of mouse meiotic chromosomes. Thus, our results point to an evolutionary conserved role for Ddc2/ATRIP in monitoring meiotic chromosome metabolism.
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Affiliation(s)
- Esther Refolio
- Instituto de Microbiología Bioquímica, CSIC / University of Salamanca, 37007 Salamanca, Spain
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40
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brca2 in zebrafish ovarian development, spermatogenesis, and tumorigenesis. Proc Natl Acad Sci U S A 2010; 107:19350-5. [PMID: 20974951 DOI: 10.1073/pnas.1011630107] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Humans with inherited mutations in BRCA2 are at increased risk for developing breast and ovarian cancer; however, the relationship between BRCA2 mutation and these cancers is not understood. Studies of Brca2 mutation by gene targeting in mice are limited, given that homozygous Brca2 mutation typically leads to early embryonic lethality. We established a zebrafish line with a nonsense mutation in brca2 exon 11 (brca2(Q658X)), a mutation similar in location and type to BRCA2 mutations found in humans with hereditary breast and ovarian cancer. brca2(Q658X) homozygous zebrafish are viable and survive to adulthood; however, juvenile homozygotes fail to develop ovaries during sexual differentiation. Instead, brca2(Q658X) homozygotes develop as infertile males with meiotic arrest in spermatocytes. Germ cell migration to the embryonic gonadal ridge is unimpaired in brca2(Q658X) homozygotes; thus, failure of ovarian development is not due to defects in early establishment of the embryonic gonad. Homozygous tp53 mutation rescues ovarian development in brca2(Q658X) homozygous zebrafish, reflecting the importance of germ cell apoptosis in gonad morphogenesis. Adult brca2(Q658X) homozygous zebrafish are predisposed to testicular neoplasias. In addition, tumorigenesis in multiple tissues is significantly accelerated in combination with homozygous tp53 mutation in both brca2(Q658X) homozygous and brca2(Q658X) heterozygous zebrafish. These studies reveal critical roles for brca2 in ovarian development and tumorigenesis in reproductive tissues.
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Decordier I, Loock KV, Kirsch-Volders M. Phenotyping for DNA repair capacity. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2010; 705:107-129. [PMID: 20478396 DOI: 10.1016/j.mrrev.2010.05.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2009] [Revised: 05/10/2010] [Accepted: 05/10/2010] [Indexed: 12/21/2022]
Affiliation(s)
- Ilse Decordier
- Laboratorium voor Cellulaire Genetica, Vrije Universiteit Brussel, Belgium.
| | - Kim Vande Loock
- Laboratorium voor Cellulaire Genetica, Vrije Universiteit Brussel, Belgium
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42
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Archetti M. Complementation, Genetic Conflict, and the Evolution of Sex and Recombination. J Hered 2010; 101 Suppl 1:S21-33. [DOI: 10.1093/jhered/esq009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Schulz RW, de França LR, Lareyre JJ, Le Gac F, Chiarini-Garcia H, Nobrega RH, Miura T. Spermatogenesis in fish. Gen Comp Endocrinol 2010; 165:390-411. [PMID: 19348807 DOI: 10.1016/j.ygcen.2009.02.013] [Citation(s) in RCA: 717] [Impact Index Per Article: 47.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Accepted: 02/20/2009] [Indexed: 02/06/2023]
Abstract
Spermatogenesis is a developmental process during which a small number of diploid spermatogonial stem cells produce a large number of highly differentiated spermatozoa carrying a haploid, recombined genome. We characterise morphologically the different germ cell stages with particular attention for the spermatogonial generations, including the stem cells and their specific capacity to colonise a recipient's testis after transplantation. We propose a nomenclature for fish germ cells to improve the comparability among different teleost fish but also to higher vertebrates. Survival and development of germ cells depends on their continuous and close contact to Sertoli cells, and we review their multiple roles in the cystic mode of spermatogenesis seen in fish. We then discuss gene expression patterns associated with testis maturation. The endocrine system of vertebrates has evolved as master control system over spermatogenesis. In fish, both pituitary gonadotropins LH and FSH stimulate gonadal sex steroid hormone production directly by activating Leydig cells. Information is reviewed on the effects of progestin, androgens, and estrogens on global testicular gene expression patterns (microarray analysis), and on the molecular mechanisms by which steroids regulate specific candidate genes (identified by subtractive hybridization approaches) during early stages of testis maturation. Moreover, progestin and androgen effects on spermiation and milt hydration are discussed. Sex steroids mainly act via receptors expressed by Sertoli cells. One type of response is that Sertoli cells change growth factor expression, which subsequently modulates germ cell proliferation/differentiation via mechanisms yet to be characterised. Finally, we review data on germ cell autonomous processes, mainly derived from loss-of-function mutant fish lines, before identifying a number of focus areas for future research activities.
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Affiliation(s)
- Rüdiger W Schulz
- Utrecht University, Science Faculty, Department Biology, Padualaan 8, NL-3584 CH Utrecht, The Netherlands.
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Mutation of the mouse Syce1 gene disrupts synapsis and suggests a link between synaptonemal complex structural components and DNA repair. PLoS Genet 2009; 5:e1000393. [PMID: 19247432 PMCID: PMC2640461 DOI: 10.1371/journal.pgen.1000393] [Citation(s) in RCA: 150] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Accepted: 01/27/2009] [Indexed: 11/19/2022] Open
Abstract
In mammals, the synaptonemal complex is a structure required to complete crossover recombination. Although suggested by cytological work, in vivo links between the structural proteins of the synaptonemal complex and the proteins of the recombination process have not previously been made. The central element of the synaptonemal complex is traversed by DNA at sites of recombination and presents a logical place to look for interactions between these components. There are four known central element proteins, three of which have previously been mutated. Here, we complete the set by creating a null mutation in the Syce1 gene in mouse. The resulting disruption of synapsis in these animals has allowed us to demonstrate a biochemical interaction between the structural protein SYCE2 and the repair protein RAD51. In normal meiosis, this interaction may be responsible for promoting homologous synapsis from sites of recombination.
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46
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Burgoyne PS, Mahadevaiah SK, Turner JMA. The consequences of asynapsis for mammalian meiosis. Nat Rev Genet 2009; 10:207-16. [PMID: 19188923 DOI: 10.1038/nrg2505] [Citation(s) in RCA: 285] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
During mammalian meiosis, synapsis of paternal and maternal chromosomes and the generation of DNA breaks are needed to allow reshuffling of parental genes. In mammals errors in synapsis are associated with a male-biased meiotic impairment, which has been attributed to a response to persisting DNA double-stranded breaks in the asynapsed chromosome segments. Recently it was discovered that the chromatin of asynapsed chromosome segments is transcriptionally silenced, providing new insights into the connection between asynapsis and meiotic impairment.
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Affiliation(s)
- Paul S Burgoyne
- Division of Stem Cell Biology and Developmental Genetics, Medical Research Council National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA.
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47
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Robles P, Roig I, Garcia R, Brieñ M, Martin M, Barbero JL, Cabero LI, Garcia-Caldés M. Analysis of recombination along chromosome 21 during human female pachytene stage. Reprod Biomed Online 2009; 18:784-94. [DOI: 10.1016/s1472-6483(10)60027-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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48
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Novel roles for MLH3 deficiency and TLE6-like amplification in DNA mismatch repair-deficient gastrointestinal tumorigenesis and progression. PLoS Genet 2008; 4:e1000092. [PMID: 18551179 PMCID: PMC2410297 DOI: 10.1371/journal.pgen.1000092] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2008] [Accepted: 05/12/2008] [Indexed: 02/08/2023] Open
Abstract
DNA mismatch repair suppresses gastrointestinal tumorgenesis. Four mammalian E. coli MutL homologues heterodimerize to form three distinct complexes: MLH1/PMS2, MLH1/MLH3, and MLH1/PMS1. To understand the mechanistic contributions of MLH3 and PMS2 in gastrointestinal tumor suppression, we generated Mlh3−/−;Apc1638N and Mlh3−/−;Pms2−/−;Apc1638N (MPA) mice. Mlh3 nullizygosity significantly increased Apc frameshift mutations and tumor multiplicity. Combined Mlh3;Pms2 nullizygosity further increased Apc base-substitution mutations. The spectrum of MPA tumor mutations was distinct from that observed in Mlh1−/−;Apc1638N mice, implicating the first potential role for MLH1/PMS1 in tumor suppression. Because Mlh3;Pms2 deficiency also increased gastrointestinal tumor progression, we used array-CGH to identify a recurrent tumor amplicon. This amplicon contained a previously uncharacterized Transducin enhancer of Split (Tle) family gene, Tle6-like. Expression of Tle6-like, or the similar human TLE6D splice isoform in colon cancer cells increased cell proliferation, colony-formation, cell migration, and xenograft tumorgenicity. Tle6-like;TLE6D directly interact with the gastrointestinal tumor suppressor RUNX3 and antagonize RUNX3 target transactivation. TLE6D is recurrently overexpressed in human colorectal cancers and TLE6D expression correlates with RUNX3 expression. Collectively, these findings provide important insights into the molecular mechanisms of individual MutL homologue tumor suppression and demonstrate an association between TLE mediated antagonism of RUNX3 and accelerated human colorectal cancer progression. Approximately one million people every year are diagnosed with colorectal cancer worldwide, and about five hundred thousand of these people subsequently perish from the disease. Colorectal cancer is thought to develop through a series of early and later stages (called cancer initiation and progression, respectively). Deaths from colorectal cancer are particularly tragic because the disease can usually be cured if discovered before full-blown progression. However, our knowledge of how these tumors progress remains very limited. DNA mismatch repair is known to be an important process in preventing ∼15% of colorectal cancer initiation. In this study we describe how two of these genes (Mlh3 and Pms2) that have partial functional redundancy and therefore individually are rarely mutated are also important in preventing colorectal cancer progression. Additionally, we describe a new gene (Tle6-like) that, when overactive, makes these cancers progress more rapidly. The overall goal of this study is to understand colorectal cancer progression better so that we can come up with new ways to block it at the later stage.
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Meiotic pairing and segregation of achiasmate sex chromosomes in eutherian mammals: the role of SYCP3 protein. PLoS Genet 2008; 3:e198. [PMID: 17983272 PMCID: PMC2048527 DOI: 10.1371/journal.pgen.0030198] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2007] [Accepted: 09/26/2007] [Indexed: 01/19/2023] Open
Abstract
In most eutherian mammals, sex chromosomes synapse and recombine during male meiosis in a small region called pseudoautosomal region. However in some species sex chromosomes do not synapse, and how these chromosomes manage to ensure their proper segregation is under discussion. Here we present a study of the meiotic structure and behavior of sex chromosomes in one of these species, the Mongolian gerbil (Meriones unguiculatus). We have analyzed the location of synaptonemal complex (SC) proteins SYCP1 and SYCP3, as well as three proteins involved in the process of meiotic recombination (RAD51, MLH1, and γ-H2AX). Our results show that although X and Y chromosomes are associated at pachytene and form a sex body, their axial elements (AEs) do not contact, and they never assemble a SC central element. Furthermore, MLH1 is not detected on the AEs of the sex chromosomes, indicating the absence of reciprocal recombination. At diplotene the organization of sex chromosomes changes strikingly, their AEs associate end to end, and SYCP3 forms an intricate network that occupies the Y chromosome and the distal region of the X chromosome long arm. Both the association of sex chromosomes and the SYCP3 structure are maintained until metaphase I. In anaphase I sex chromosomes migrate to opposite poles, but SYCP3 filaments connecting both chromosomes are observed. Hence, one can assume that SYCP3 modifications detected from diplotene onwards are correlated with the maintenance of sex chromosome association. These results demonstrate that some components of the SC may participate in the segregation of achiasmate sex chromosomes in eutherian mammals. Meiosis is a special kind of cell division that leads to the formation of gametes. During meiosis the number of chromosomes must be halved in the daughter cells, and to do this properly, most organisms use an amazing strategy: during the first of the two meiotic divisions, homologous chromosomes associate in pairs, undergo a reciprocal genetic interchange, and then each member of the pair segregates into a different daughter cell. Genetic exchange, called meiotic recombination, is a key process to ensure that homologous chromosomes remain tightly associated until they segregate. In general, sex chromosomes are subjected to the same processes as the rest of chromosomes. But, of course, exceptions exist. This is the case in the Mongolian gerbil, a mammal whose sex chromosomes pair and segregate during male meiosis without undergoing meiotic recombination. We have found that they are able to do this because some proteins of a meiosis-specific structure, the synaptonemal complex, are reorganized to maintain sex chromosomes associated until they segregate into daughter cells. This kind of behavior resembles the situation found in marsupials and some insect species, indicating a recurrent role of synaptonemal complex components in chromosome segregation when meiotic recombination is missing.
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Yang F, Gell K, van der Heijden GW, Eckardt S, Leu NA, Page DC, Benavente R, Her C, Höög C, McLaughlin KJ, Wang PJ. Meiotic failure in male mice lacking an X-linked factor. Genes Dev 2008; 22:682-91. [PMID: 18316482 DOI: 10.1101/gad.1613608] [Citation(s) in RCA: 129] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Meiotic silencing of sex chromosomes may cause their depletion of meiosis-specific genes during evolution. Here, we challenge this hypothesis by reporting the identification of TEX11 as the first X-encoded meiosis-specific factor in mice. TEX11 forms discrete foci on synapsed regions of meiotic chromosomes and appears to be a novel constituent of meiotic nodules involved in recombination. Loss of TEX11 function causes chromosomal asynapsis and reduced crossover formation, leading to elimination of spermatocytes, respectively, at the pachytene and anaphase I stages. Specifically, TEX11-deficient spermatocytes with asynapsed autosomes undergo apoptosis at the pachytene stage, while those with only asynapsed sex chromosomes progress. However, cells that survive the pachytene stage display chromosome nondisjunction at the first meiotic division, resulting in cell death and male infertility. TEX11 interacts with SYCP2, which is an integral component of the synaptonemal complex lateral elements. Thus, TEX11 promotes initiation and/or maintenance of synapsis and formation of crossovers, and may provide a physical link between these two meiotic processes.
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Affiliation(s)
- Fang Yang
- Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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