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Journal articles on the topic 'Meiosis. Oogenesis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Verlhac, Marie-Hélène. "Meiosis and oogenesis." Molecular Biology of the Cell 23, no. 6 (2012): 971. http://dx.doi.org/10.1091/mbc.e11-12-0982.

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2

Matsuura, Rieko, Tomoko Ashikawa, Yuka Nozaki, and Daiju Kitagawa. "LIN-41 inactivation leads to delayed centrosome elimination and abnormal chromosome behavior during female meiosis in Caenorhabditis elegans." Molecular Biology of the Cell 27, no. 5 (2016): 799–811. http://dx.doi.org/10.1091/mbc.e15-10-0713.

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During oogenesis, two successive meiotic cell divisions occur without functional centrosomes because of the inactivation and subsequent elimination of maternal centrosomes during the diplotene stage of meiosis I. Despite being a conserved phenomenon in most metazoans, the means by which this centrosome behavior is controlled during female meiosis remain elusive. Here, we conducted a targeted RNAi screening in the Caenorhabditis elegans gonad to identify novel regulators of centrosome behavior during oogenesis. We screened 513 genes known to be essential for embryo production and directly visua

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3

Singh, Vijay Pratap, Wei-Ting Yueh, Jennifer L. Gerton, and Francesca E. Duncan. "Oocyte-specific deletion of Hdac8 in mice reveals stage-specific effects on fertility." Reproduction 157, no. 3 (2019): 305–16. http://dx.doi.org/10.1530/rep-18-0560.

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Eighteen histone deacetylases exist in mammals. The class 1 histone deacetylases HDAC1 and HDAC2 are important for oogenesis and fertility in mice, likely via their effects on histones. The reproductive function of HDAC8, another class 1 enzyme, has not been explored. One key target of HDAC8 is the SMC3 subunit of cohesin, an essential complex mediating sister chromatid cohesion and chromosome segregation. In current models, HDAC8 activity is required for SMC3 recycling, but this function should be dispensable in oocytes since cohesion is established during pre-meiotic S phase and maintained u

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4

Extavour, Cassandra. "Oogenesis: Making the Mos of Meiosis." Current Biology 19, no. 12 (2009): R489—R491. http://dx.doi.org/10.1016/j.cub.2009.05.015.

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Blokhina, Yana P., Michelle A. Frees, An Nguyen, et al. "Rad21l1 cohesin subunit is dispensable for spermatogenesis but not oogenesis in zebrafish." PLOS Genetics 17, no. 6 (2021): e1009127. http://dx.doi.org/10.1371/journal.pgen.1009127.

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During meiosis I, ring-shaped cohesin complexes play important roles in aiding the proper segregation of homologous chromosomes. RAD21L is a meiosis-specific vertebrate cohesin that is required for spermatogenesis in mice but is dispensable for oogenesis in young animals. The role of this cohesin in other vertebrate models has not been explored. Here, we tested if the zebrafish homolog Rad21l1 is required for meiotic chromosome dynamics during spermatogenesis and oogenesis. We found that Rad21l1 localizes to unsynapsed chromosome axes. It is also found between the axes of the mature tripartite

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Wang, Lina, Zhiliang Xu, Muhammad Babar Khawar, Chao Liu, and Wei Li. "The histone codes for meiosis." Reproduction 154, no. 3 (2017): R65—R79. http://dx.doi.org/10.1530/rep-17-0153.

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Meiosis is a specialized process that produces haploid gametes from diploid cells by a single round of DNA replication followed by two successive cell divisions. It contains many special events, such as programmed DNA double-strand break (DSB) formation, homologous recombination, crossover formation and resolution. These events are associated with dynamically regulated chromosomal structures, the dynamic transcriptional regulation and chromatin remodeling are mainly modulated by histone modifications, termed ‘histone codes’. The purpose of this review is to summarize the histone codes that are

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7

Karashima, T., A. Sugimoto, and M. Yamamoto. "Caenorhabditis elegans homologue of the human azoospermia factor DAZ is required for oogenesis but not for spermatogenesis." Development 127, no. 5 (2000): 1069–79. http://dx.doi.org/10.1242/dev.127.5.1069.

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DAZ (Deleted in Azoospermia), the putative azoospermia factor gene in human, encodes a ribonucleoprotein-type RNA-binding protein required for spermatogenesis. A Drosophila homologue of DAZ, called boule, is also essential for spermatogenesis. A mouse homologue, Dazla, is implicated in both spermatogenesis and oogenesis. Here, we report the identification and characterization of daz-1, the single DAZ homologue in the nematode Caenorhabditis elegans. Loss of daz-1 function caused sterility in hermaphrodites, by blocking oogenesis at the pachytene stage of meiosis I. Epistasis analysis suggested

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Reunov, Arkadiy, Yana Alexandrova, Yulia Reunova, Alina Komkova, and Liliana Milani. "Germ plasm provides clues on meiosis: the concerted action of germ plasm granules and mitochondria in gametogenesis of the clam Ruditapes philippinarum." Zygote 27, no. 1 (2018): 25–35. http://dx.doi.org/10.1017/s0967199418000588.

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SummaryGerm plasm-related structures (GPRS) are known to accompany meiotic cell differentiation but their dynamics are still poorly understood. In this study, we analyzed the ultrastructural mechanisms of GPRS transformation during oogenesis and spermatogenesis of the bivalve mollusc Ruditapes philippinarum (Manila clam), exploring patterns of GPRS activity occurring at meiosis onset, sex-specific difference/similarity of such patterns, and the involvement of mitochondria during GPRS-assigned events. In the two sexes, the zygotene–pachytene stage of meiosis is anticipated by three shared steps

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9

Keefe, David L., and Lin Liu. "Telomeres and reproductive aging." Reproduction, Fertility and Development 21, no. 1 (2009): 10. http://dx.doi.org/10.1071/rd08229.

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Infertility, miscarriage and aneuploid offspring increase with age in women, and meiotic dysfunction underlies reproductive aging. How aging disrupts meiotic function in women remains unclear, but as women increasingly delay having children, solving this problem becomes an urgent priority. Telomeres consist of a (TTAGGG)n repeated sequence and associated proteins at chromosome ends, mediate aging in mitotic cells and may also mediate aging during meiosis. Telomeres shorten both during DNA replication and from the response to oxidative DNA damage. Oocytes do not divide in adult mammals, but the

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10

Zhao, Zheng-Hui, Heide Schatten, and Qing-Yuan Sun. "High-throughput sequencing reveals landscapes of female germ cell development." Molecular Human Reproduction 26, no. 10 (2020): 738–47. http://dx.doi.org/10.1093/molehr/gaaa059.

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Abstract Female germ cell development is a highly complex process that includes meiosis initiation, oocyte growth recruitment, oocyte meiosis retardation and resumption and final meiotic maturation. A series of coordinated molecular signaling factors ensure successful oogenesis. The recent rapid development of high-throughput sequencing technologies allows for the dynamic omics in female germ cells, which is essential for further understanding the regulatory mechanisms of molecular events comprehensively. In this review, we summarize the current literature of multi-omics sequenced by epigenome

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11

Li, Jian, Wei-Ping Qian, and Qing-Yuan Sun. "Cyclins regulating oocyte meiotic cell cycle progression†." Biology of Reproduction 101, no. 5 (2019): 878–81. http://dx.doi.org/10.1093/biolre/ioz143.

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Abstract Oocyte meiotic maturation is a vital and final process in oogenesis. Unlike somatic cells， the oocyte needs to undergo two continuous meiotic divisions (meiosis I and meiosis II) to become a haploid gamete. Notably, oocyte meiotic progression includes two rounds of unique meiotic arrest and resumption. The first arrest occurs at the G2 (germinal vesicle) stage and meiosis resumption is stimulated by a gonadotropin surge; the second arrest takes place at the metaphase II stage, the stage from which it is released when fertilization takes place. The maturation-promoting factor, which co

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12

Hiruta, Chizue, Chizuko Nishida, and Shin Tochinai. "Abortive meiosis in the oogenesis of parthenogenetic Daphnia pulex." Chromosome Research 18, no. 7 (2010): 833–40. http://dx.doi.org/10.1007/s10577-010-9159-2.

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13

Reunov, Arkadiy A., Doris W. T. Au, Yana N. Alexandrova, et al. "Germ plasm-related structures in marine medaka gametogenesis; novel sites of Vasa localization and the unique mechanism of germ plasm granule arising." Zygote 28, no. 1 (2019): 9–23. http://dx.doi.org/10.1017/s0967199419000546.

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SummaryGerm plasm, a cytoplasmic factor of germline cell differentiation, is suggested to be a perspective tool for in vitro meiotic differentiation. To discriminate between the: (1) germ plasm-related structures (GPRS) involved in meiosis triggering; and (2) GPRS involved in the germ plasm storage phase, we investigated gametogenesis in the marine medaka Oryzias melastigma. The GPRS of the mitosis-to-meiosis period are similar in males and females. In both sexes, five events typically occur: (1) turning of the primary Vasa-positive germ plasm granules into the Vasa-positive intermitochondrial

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14

LeMaire-Adkins, Renée, Kristi Radke, and Patricia A. Hunt. "Lack of Checkpoint Control at the Metaphase/Anaphase Transition: A Mechanism of Meiotic Nondisjunction in Mammalian Females." Journal of Cell Biology 139, no. 7 (1997): 1611–19. http://dx.doi.org/10.1083/jcb.139.7.1611.

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A checkpoint mechanism operates at the metaphase/anaphase transition to ensure that a bipolar spindle is formed and that all the chromosomes are aligned at the spindle equator before anaphase is initiated. Since mistakes in the segregation of chromosomes during meiosis have particularly disastrous consequences, it seems likely that the meiotic cell division would be characterized by a stringent metaphase/ anaphase checkpoint. To determine if the presence of an unaligned chromosome activates the checkpoint and delays anaphase onset during mammalian female meiosis, we investigated meiotic cell c

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15

Fan, Xueying, Ioannis Moustakas, Vanessa Torrens-Juaneda, et al. "Transcriptional progression during meiotic prophase I reveals sex-specific features and X chromosome dynamics in human fetal female germline." PLOS Genetics 17, no. 9 (2021): e1009773. http://dx.doi.org/10.1371/journal.pgen.1009773.

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During gametogenesis in mammals, meiosis ensures the production of haploid gametes. The timing and length of meiosis to produce female and male gametes differ considerably. In contrast to males, meiotic prophase I in females initiates during development. Hence, the knowledge regarding progression through meiotic prophase I is mainly focused on human male spermatogenesis and female oocyte maturation during adulthood. Therefore, it remains unclear how the different stages of meiotic prophase I between human oogenesis and spermatogenesis compare. Analysis of single-cell transcriptomics data from

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Persson, Jenny Liao, Qi Zhang, Xiang Yuan Wang, Stuart E. Ravnik, Samantha Muhlrad, and Debra J. Wolgemuth. "Distinct roles for the mammalian A-type cyclins during oogenesis." Reproduction 130, no. 4 (2005): 411–22. http://dx.doi.org/10.1530/rep.1.00719.

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There are two A-type cyclins in higher vertebrates, cyclin A1 and A2. Targeted mutagenesis has shown that cyclin A2 is essential for early embryonic development while cyclin A1 is required only for male meiosis. The embryonic lethality of cyclin A2 knockout mice has obviated understanding its role in other aspects of mammalian development, including the germ line. We reported previously that cyclin A2 expression in the male germ line is consistent with a role in both mitotic and meiotic cell cycles. Usingin situhybridization and immunohistochemistry, we now observe high levels of cyclin A2 in

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17

Chen, B., E. Harms, T. Chu, G. Henrion, and S. Strickland. "Completion of meiosis in Drosophila oocytes requires transcriptional control by grauzone, a new zinc finger protein." Development 127, no. 6 (2000): 1243–51. http://dx.doi.org/10.1242/dev.127.6.1243.

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Mutations in grauzone or cortex cause abnormal arrest in Drosophila female meiosis. We cloned grauzone and identified it as a C2H2-type zinc finger transcription factor. The grauzone transcript is present in ovaries and at later developmental stages. A Grauzone-GFP fusion protein is functional and localizes to nuclei of both nurse cells and follicle cells during oogenesis. Three lines of evidence indicate that grauzone and cortex interact: reducing cortex function enhanced the grauzone mutant phenotype; cortex transcript abundance is reduced in the absence of grauzone function and Grauzone pro

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18

Morohaku, Kanako, Ren Tanimoto, Keisuke Sasaki, et al. "Complete in vitro generation of fertile oocytes from mouse primordial germ cells." Proceedings of the National Academy of Sciences 113, no. 32 (2016): 9021–26. http://dx.doi.org/10.1073/pnas.1603817113.

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Reconstituting gametogenesis in vitro is a key goal for reproductive biology and regenerative medicine. Successful in vitro reconstitution of primordial germ cells and spermatogenesis has recently had a significant effect in the field. However, recapitulation of oogenesis in vitro remains unachieved. Here we demonstrate the first reconstitution, to our knowledge, of the entire process of mammalian oogenesis in vitro from primordial germ cells, using an estrogen-receptor antagonist that promotes normal follicle formation, which in turn is crucial for supporting oocyte growth. The fundamental ev

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19

Harms, Emily, Tehyen Chu, Gwénola Henrion, and Sidney Strickland. "The Only Function of Grauzone Required for Drosophila Oocyte Meiosis Is Transcriptional Activation of the cortex Gene." Genetics 155, no. 4 (2000): 1831–39. http://dx.doi.org/10.1093/genetics/155.4.1831.

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Abstract The grauzone and cortex genes are required for the completion of meiosis in Drosophila oocytes. The grauzone gene encodes a C2H2-type zinc-finger transcription factor that binds to the cortex promoter and is necessary for high-level activation of cortex transcription. Here we define the region of the cortex promoter to which Grauzone binds and show that the binding occurs through the C-terminal, zinc-finger-rich region of the protein. Mutations in two out of the five grauzone alleles result in single amino acid changes within different zinc-finger motifs. Both of these mutations resul

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20

Meneely, Philip M., Anna F. Farago, and Tate M. Kauffman. "Crossover Distribution and High Interference for Both the X Chromosome and an Autosome During Oogenesis and Spermatogenesis in Caenorhabditis elegans." Genetics 162, no. 3 (2002): 1169–77. http://dx.doi.org/10.1093/genetics/162.3.1169.

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Abstract Regulation of both the number and the location of crossovers during meiosis is important for normal chromosome segregation. We used sequence-tagged site polymorphisms to examine the distribution of all crossovers on the X chromosome during oogenesis and on one autosome during both oogenesis and spermatogenesis in Caenorhabditis elegans. The X chromosome has essentially one crossover during oogenesis, with only three possible double crossover exceptions among 220 recombinant X chromosomes. All three had one of the two crossovers in the same chromosomal interval, suggesting that crossov

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21

Manheim, Elizabeth A., Janet K. Jang, Danielle Dominic, and Kim S. McKim. "Cytoplasmic Localization and Evolutionary Conservation of MEI-218, a Protein Required for Meiotic Crossing-over inDrosophila." Molecular Biology of the Cell 13, no. 1 (2002): 84–95. http://dx.doi.org/10.1091/mbc.01-06-0318.

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During Drosophila oogenesis, the oocyte is formed within a 16-cell cyst immediately after four incomplete cell divisions. One of the primary events in oocyte development is meiotic recombination. Here, we report the intracellular localization of the MEI-218 protein that is specifically required for meiotic crossing-over. To understand the role of mei-218 in meiosis and to study the regulation of genes required for meiotic recombination, we characterized the expression pattern of its RNA and protein. Furthermore, we cloned and sequenced mei-218from two other Drosophila species. Themei-218 RNA a

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22

Bell, P. R. "The phase change in ferns." Acta Societatis Botanicorum Poloniae 50, no. 1-2 (2014): 307–14. http://dx.doi.org/10.5586/asbp.1981.050.

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It is argued that the phasic alternation of sporophyte and gametophyte in ferns involves changing gene activation during oogenesis and sporogenesis respectively. The reasons for the change in activation are to be sought in the nutritional states of the cells in which the transition takes place. The readiness with Which apospory can the induced in ferns has enabled the features of meiosis which are essential for the switch in the form of growth to be distinguished from those which are related to the distinctive behaviour of the chromosomes. The dramatic changes in the cytoplasm of meiotic cells

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Hartman, T. P. V., and D. I. Southern. "Female meiosis in the onion fly and cabbage root fly (Diptera: Anthomyiidae)." Genome 37, no. 5 (1994): 848–57. http://dx.doi.org/10.1139/g94-120.

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The sequence of female meiosis was investigated in two populations of the cabbage root fly (Delia radicum) and three populations of the onion fly (D. antiqua). In contrast with the completely achiasmate males, both species showed high levels of recombination in females. However, significant differences in chiasma frequency occurred between individuals within populations and between the populations. It was not uncommon to find aneuploidy of the X chromosomes. The autosomes occasionally showed asynapsis or desynapsis, but normal disjunction of univalents was facilitated by distance pairing.Key w

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Francis, R., E. Maine, and T. Schedl. "Analysis of the multiple roles of gld-1 in germline development: interactions with the sex determination cascade and the glp-1 signaling pathway." Genetics 139, no. 2 (1995): 607–30. http://dx.doi.org/10.1093/genetics/139.2.607.

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Abstract The Caenorhabditis elegans gene gld-1 is essential for oocyte development; in gld-1 (null) hermaphrodites, a tumor forms where oogenesis would normally occur. We use genetic epistasis analysis to demonstrate that tumor formation is dependent on the sexual fate of the germline. When the germline sex determination pathway is set in the female mode (terminal fem/fog genes inactive), gld-1 (null) germ cells exit meiotic prophase and proliferate to form a tumor, but when the pathway is set in the male mode, they develop into sperm. We conclude that the gld-1 (null) phenotype is cell-type s

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Marlow, Florence L. "Recent advances in understanding oogenesis: interactions with the cytoskeleton, microtubule organization, and meiotic spindle assembly in oocytes." F1000Research 7 (April 17, 2018): 468. http://dx.doi.org/10.12688/f1000research.13837.1.

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Maternal control of development begins with production of the oocyte during oogenesis. All of the factors necessary to complete oocyte maturation, meiosis, fertilization, and early development are produced in the transcriptionally active early oocyte. Active transcription of the maternal genome is a mechanism to ensure that the oocyte and development of the early embryo begin with all of the factors needed for successful embryonic development. To achieve the maximum maternal store, only one functional cell is produced from the meiotic divisions that produce the oocyte. The oocyte receives the

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Bowles, Josephine, and Peter Koopman. "Sex determination in mammalian germ cells: extrinsic versus intrinsic factors." REPRODUCTION 139, no. 6 (2010): 943–58. http://dx.doi.org/10.1530/rep-10-0075.

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Mammalian germ cells do not determine their sexual fate based on their XX or XY chromosomal constitution. Instead, sexual fate is dependent on the gonadal environment in which they develop. In a fetal testis, germ cells commit to the spermatogenic programme of development during fetal life, although they do not enter meiosis until puberty. In a fetal ovary, germ cells commit to oogenesis by entering prophase of meiosis I. Although it was believed previously that germ cells are pre-programmed to enter meiosis unless they are actively prevented from doing so, recent results indicate that meiosis

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Mihalas, Bettina P., Patrick S. Western, Kate L. Loveland, Eileen A. McLaughlin, and Janet E. Holt. "Changing expression and subcellular distribution of karyopherins during murine oogenesis." REPRODUCTION 150, no. 6 (2015): 485–96. http://dx.doi.org/10.1530/rep-14-0585.

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Mammalian oocyte growth and development is driven by a strict program of gene expression that relies on the timely presence of transcriptional regulators via nuclear pores. By targeting specific cargos for nucleo-cytoplasmic transport, karyopherin (KPN) proteins are key to the relocation of essential transcription factors and chromatin-remodelling factors into and out of the nucleus. Using multiple complementary techniques, here we establish that KPNA genes and proteins are dynamically expressed and relocalised throughout mouse oogenesis and folliculogenesis. Of the KPNAs examined (Kpna1, Kpna

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28

Morris, Jason Z., Caryn Navarro, and Ruth Lehmann. "Identification and Analysis of Mutations inbob, Doaand Eight New Genes Required for Oocyte Specification and Development inDrosophila melanogaster." Genetics 164, no. 4 (2003): 1435–46. http://dx.doi.org/10.1093/genetics/164.4.1435.

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AbstractThe Drosophila oocyte develops from a cluster of 16 interconnected cells that derive from a common progenitor. One of these cells, the oocyte, arrests in meiosis. The other cells endoreplicate their DNA and produce mRNAs and proteins that they traffic to the oocyte along a polarized microtubule cytoskeleton shared by the entire cyst. Therefore, Drosophila oogenesis is an attractive system for the study of cell cycle control and cell polarity. We carried out a clonal screen on the right arm of chromosome 3 for female sterile mutations using the FLP-FRT-ovoD system to identify new genes

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29

Hodges, Craig A., Renée LeMaire-Adkins, and Patricia A. Hunt. "Coordinating the segregation of sister chromatids during the first meiotic division: evidence for sexual dimorphism." Journal of Cell Science 114, no. 13 (2001): 2417–26. http://dx.doi.org/10.1242/jcs.114.13.2417.

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Errors during the first meiotic division are common in our species, but virtually all occur during female meiosis. The reason why oogenesis is more error prone than spermatogenesis remains unknown. Normal segregation of homologous chromosomes at the first meiotic division (MI) requires coordinated behavior of the sister chromatids of each homolog. Failure of sister kinetochores to act cooperatively at MI, or precocious sister chromatid segregation (PSCS), has been postulated to be a major contributor to human nondisjunction. To investigate the factors that influence PSCS we utilized the XO mou

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30

Weingartová, I., M. Dvořáková, J. Nevoral, et al. "Back In Time: Fish Oocyte As A Superior Model For Human Reproduction? A Review." Scientia Agriculturae Bohemica 46, no. 1 (2015): 7–20. http://dx.doi.org/10.1515/sab-2015-0011.

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Abstract The progress of reproductive biotechnology is dependent on the amount, quality, and availability of female gametes – oocytes. The proper selection of a suitable model organism is vital to ensure effective research of the signal pathways that regulate oogenesis and meiotic maturation. Many factors are involved in meiosis regulation and some of them are evolutionarily conserved. Xenopus laevis is a traditional model for cell cycle research, which has become a background for a more detailed study of models that are similar to humans. In contrast to mammalian models, water-living vertebra

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Otori, Muneyoshi, Takeshi Karashima, and Masayuki Yamamoto. "The Caenorhabditis elegans Homologue of Deleted in Azoospermia Is Involved in the Sperm/Oocyte Switch." Molecular Biology of the Cell 17, no. 7 (2006): 3147–55. http://dx.doi.org/10.1091/mbc.e05-11-1067.

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The Deleted in Azoospermia (DAZ) gene family encodes putative translational activators that are required for meiosis and other aspects of gametogenesis in animals. The single Caenorhabditis elegans homologue of DAZ, daz-1, is an essential factor for female meiosis. Here, we show that daz-1 is important for the switch from spermatogenesis to oogenesis (the sperm/oocyte switch), which is an essential step for the hermaphrodite germline to produce oocytes. RNA interference of the daz-1 orthologue in a related nematode, Caenorhabditis briggsae, resulted in a complete loss of the sperm/oocyte switc

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Delves, C. J., R. E. Howells, and R. J. Post. "Gametogenesis and fertilization in Dirofilaria immitis (Nematoda: Filarioidea)." Parasitology 92, no. 1 (1986): 181–97. http://dx.doi.org/10.1017/s003118200006354x.

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SUMMARYGametogenesis in Dirofilaria immitis has been studied principally by means of the aceto-orcein chromosomal squash technique, but with additional ultrastructural observations. A terminal germinative zone, in which a continuous and rapid division of germ cells occurs, has been identified in the gonoduct of both male and female worms. Approximately 20% of cells within these germinative zones were in arrested mitotic division following the incubation in vitro of excised gonads in 0·01% colchicine for 4 h. All primary spermatocytes within a 1–2 cm length of the testis proximal to the germina

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Ganot, Philippe, Alexandra Moosmann-Schulmeister, and Eric M. Thompson. "Oocyte selection is concurrent with meiosis resumption in the coenocystic oogenesis of Oikopleura." Developmental Biology 324, no. 2 (2008): 266–76. http://dx.doi.org/10.1016/j.ydbio.2008.09.016.

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34

Hongay, C. F., and T. L. Orr-Weaver. "Drosophila Inducer of MEiosis 4 (IME4) is required for Notch signaling during oogenesis." Proceedings of the National Academy of Sciences 108, no. 36 (2011): 14855–60. http://dx.doi.org/10.1073/pnas.1111577108.

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Wessel, Gary M., Sean D. Conner, and Linnea Berg. "Cortical granule translocation is microfilament mediated and linked to meiotic maturation in the sea urchin oocyte." Development 129, no. 18 (2002): 4315–25. http://dx.doi.org/10.1242/dev.129.18.4315.

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Cortical granules exocytose after the fusion of egg and sperm in most animals, and their contents function in the block to polyspermy by creating an impenetrable extracellular matrix. Cortical granules are synthesized throughout oogenesis and translocate en masse to the cell surface during meiosis where they remain until fertilization. As the mature oocyte is approximately 125 μm in diameter (Lytechinus variegatus), many of the cortical granules translocate upwards of 60 μm to reach the cortex within a 4 hour time window. We have investigated the mechanism of this coordinated vesicular translo

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Adams, Ian R., and Anne McLaren. "Sexually dimorphic development of mouse primordial germ cells: switching from oogenesis to spermatogenesis." Development 129, no. 5 (2002): 1155–64. http://dx.doi.org/10.1242/dev.129.5.1155.

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During embryogenesis, primordial germ cells (PGCs) have the potential to enter either spermatogenesis or oogenesis. In a female genital ridge, or in a non-gonadal environment, PGCs develop as meiotic oocytes. However, male gonadal somatic cells inhibit PGCs from entering meiosis and direct them to a spermatogenic fate. We have examined the ability of PGCs from male and female embryos to respond to the masculinising environment of the male genital ridge, defining a temporal window during which PGCs retain a bipotential fate. To help understand how PGCs respond to the male gonadal environment, w

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Elkouby, Yaniv M., and Mary C. Mullins. "Coordination of cellular differentiation, polarity, mitosis and meiosis – New findings from early vertebrate oogenesis." Developmental Biology 430, no. 2 (2017): 275–87. http://dx.doi.org/10.1016/j.ydbio.2017.06.029.

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Carroll, J., K. Swann, D. Whittingham, and M. Whitaker. "Spatiotemporal dynamics of intracellular [Ca2+]i oscillations during the growth and meiotic maturation of mouse oocytes." Development 120, no. 12 (1994): 3507–17. http://dx.doi.org/10.1242/dev.120.12.3507.

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Calcium oscillations occur during meiotic maturation of mouse oocytes. They also trigger activation at fertilization. We have monitored [Ca2+]i in oocytes at different stages of growth and maturation to examine how the calcium release mechanisms alter during oogenesis. Spontaneous calcium oscillations occur every 2–3 minutes in the majority of fully grown (but immature) mouse oocytes released from antral follicles and resuming meiosis. The oscillations last for 2–4 hours after release from the follicle and take the form of global synchronous [Ca2+]i increases throughout the cell. Rapid image a

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Koutsouveli, Vasiliki, Paco Cárdenas, Nadiezhda Santodomingo, et al. "The Molecular Machinery of Gametogenesis in Geodia Demosponges (Porifera): Evolutionary Origins of a Conserved Toolkit across Animals." Molecular Biology and Evolution 37, no. 12 (2020): 3485–506. http://dx.doi.org/10.1093/molbev/msaa183.

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Abstract All animals are capable of undergoing gametogenesis. The ability of forming haploid cells from diploid cells through meiosis and recombination appeared early in eukaryotes, whereas further gamete differentiation is mostly a metazoan signature. Morphologically, the gametogenic process presents many similarities across animal taxa, but little is known about its conservation at the molecular level. Porifera are the earliest divergent animals and therefore are an ideal phylum to understand evolution of the gametogenic toolkits. Although sponge gametogenesis is well known at the histologic

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Kuznetsova, Valentina G., Seppo Nokkala, and Dmitri E. Shcherbakov. "Karyotype, reproductive organs, and pattern of gametogenesis in Zorotypus hubbardi Caudell (Insecta: Zoraptera, Zorotypidae), with discussion on relationships of the order." Canadian Journal of Zoology 80, no. 6 (2002): 1047–54. http://dx.doi.org/10.1139/z02-074.

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For the first time, the karyotype is described in a representative of the order Zoraptera. Zorotypus hubbardi Caudell (Zorotypidae) have holokinetic chromosomes and male karotype of 2n = 38 (36 + neo-XY). Males possess two follicles in each testis and females have six panoistic ovarioles in each ovary. Oogenesis and, more closely, spermato genesis, including meiosis and sperm formation, have been studied. Based on the presence of panoistic ovaries and holokinetic chromosomes, Crampton's hypothesis that Zoraptera represent a group of Polyneoptera nearest to the origin of Paraneoptera is conside

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Kasravi, Armin, Marika F. Walter, Stephanie Brand, James M. Mason, and Harald Biessmann. "Molecular Cloning and Tissue-Specific Expression of the mutator2 Gene (mu2) in Drosophila melanogaster." Genetics 152, no. 3 (1999): 1025–35. http://dx.doi.org/10.1093/genetics/152.3.1025.

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Abstract We present here the molecular cloning and characterization of the mutator2 (mu2) gene of Drosophila melanogaster together with further genetic analyses of its mutant phenotype. mu2 functions in oogenesis during meiotic recombination, during repair of radiation damage in mature oocytes, and in proliferating somatic cells, where mu2 mutations cause an increase in somatic recombination. Our data show that mu2 represents a novel component in the processing of double strand breaks (DSBs) in female meiosis. mu2 does not code for a DNA repair enzyme because mu2 mutants are not hypersensitive

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Feng, Yan-Min, Gui-Jin Liang, Bo Pan, et al. "Notch pathway regulates female germ cell meiosis progression and early oogenesis events in fetal mouse." Cell Cycle 13, no. 5 (2014): 782–91. http://dx.doi.org/10.4161/cc.27708.

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Kupriyanova, L. A., L. D. Safronova, V. B. Sycheva, F. D. Danielyan, and V. G. Petrosyan. "Oogenesis (Prophase 1 of Meiosis) and Mitotic Chromosomes of Parthenogenetic Species Darevskia armeniaca (Family Lacertidae)." Biology Bulletin 48, no. 3 (2021): 274–80. http://dx.doi.org/10.1134/s1062359021030080.

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Crittenden, Sarah L., Christian R. Eckmann, Liaoteng Wang, David S. Bernstein, Marvin Wickens, and Judith Kimble. "Regulation of the mitosis/meiosis decision in the Caenorhabditis elegans germline." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 358, no. 1436 (2003): 1359–62. http://dx.doi.org/10.1098/rstb.2003.1333.

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During the development of multicellular organisms, the processes of growth and differentiation are kept in balance to generate and maintain tissues and organs of the correct size, shape and cellular composition. We have investigated the molecular controls of growth and differentiation in the Caenorhabditis elegans germline. A single somatic cell, called the distal tip cell, promotes mitotic proliferation in the adjacent germline by GLP–1/Notch signalling. Within the germline, the decisions between mitosis and meiosis and between spermatogenesis and oogenesis are controlled by a group of conser

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Bukovsky, Antonin, Michael R. Caudle, Satish K. Gupta, et al. "Mammalian neo-oogenesis and expression of meiosis-specific protein SCP3 in adult human and monkey ovaries." Cell Cycle 7, no. 5 (2008): 683–86. http://dx.doi.org/10.4161/cc.7.5.5453.

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Liang, Gui-Jin, Xi-Feng Zhang, Jun-Jie Wang, et al. "Activin A Accelerates the Progression of Fetal Oocytes Throughout Meiosis and Early Oogenesis in the Mouse." Stem Cells and Development 24, no. 20 (2015): 2455–65. http://dx.doi.org/10.1089/scd.2015.0068.

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Frankenberg, S., G. Newell, and L. Selwood. "A light microscopic study of oogenesis in the brushtail possum Trichosurus vulpecula." Reproduction, Fertility and Development 8, no. 4 (1996): 541. http://dx.doi.org/10.1071/rd9960541.

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Ovaries from young of the brushtail possum, Trichosurus vulpecula, were examined histologically and histochemically to determine stages of oogenesis. Groups of dividing oogonia were first present in a 13-day-old pouch young, with extensive oogonial proliferation after about 23 days of age. Meiosis was initiated in some oogonia by 48 days of age, and by 88 days numerous early primordial follicles were present. The first primary follicles had formed by 103 days of age. In oocytes of quiescent primordial follicles, dark granular material, which stained positively for protein, mainly occupied the

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Wang, Pengcheng, Fangyuan Yang, Zhuo Ma, and Runzhi Zhang. "Chromosome Unipolar Division and Low Expression of Tws May Cause Parthenogenesis of Rice Water Weevil (Lissorhoptrus oryzophilus Kuschel)." Insects 12, no. 4 (2021): 278. http://dx.doi.org/10.3390/insects12040278.

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Rice water weevil (RWW) is divided into two types of population, triploid parthenogenesis and diploid bisexual reproduction. In this study, we explored the meiosis of triploid parthenogenesis RWW (Shangzhuang Town, Haidian District, Beijing, China) by marking the chromosomes and microtubules of parthenogenetic RWW oocytes via immunostaining. The immunostaining results show that there is a canonical meiotic spindle formed in the triploid parthenogenetic RWW oocytes, but chromosomes segregate at only one pole, which means that there is a chromosomal unipolar division during the oogenesis of the

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Hou, Fuyin, Min Xiao, Jian Li, et al. "Ameliorative Effect of Grape Seed Proanthocyanidin Extract on Cadmium-Induced Meiosis Inhibition During Oogenesis in Chicken Embryos." Anatomical Record 299, no. 4 (2016): 450–60. http://dx.doi.org/10.1002/ar.23320.

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Bharti, Dinesh, Si-Jung Jang, Sang-Yun Lee, Sung-Lim Lee, and Gyu-Jin Rho. "In Vitro Generation of Oocyte Like Cells and Their In Vivo Efficacy: How Far We have been Succeeded." Cells 9, no. 3 (2020): 557. http://dx.doi.org/10.3390/cells9030557.

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In the last few decades, stem cell therapy has grown as a boon for many pathological complications including female reproductive disorders. In this review, a brief description of available strategies that are related to stem cell-based in vitro oocyte-like cell (OLC) development are given. We have tried to cover all the aspects and latest updates of the in vitro OLC developmental methodologies, marker profiling, available disease models, and in vivo efficacies, with a special focus on mesenchymal stem cells (MSCs), induced pluripotent stem cells (iPSCs), and embryonic stem cells (ESCs) usage.

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