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https://www.readbyqxmd.com/read/29107981/prevalence-and-risk-factors-of-monochorionic-diamniotic-twinning-after-assisted-reproduction-a-six-year-experience-base-on-a-large-cohort-of-pregnancies
#1
Bing Song, Zhao-Lian Wei, Xiao-Feng Xu, Xue Wang, Xiao-Jin He, Huan Wu, Ping Zhou, Yun-Xia Cao
OBJECTIVE: To characterize the incidence and risk factors for monochorionic diamniotic(MC-DA) twinning after assisted reproductive technologies (ART). DESIGN: Retrospective population-based study. SETTING: The study was conducted in China; Department of Reproductive Medicine Center at The First Affiliated Hospital of Anhui Medical University. POPULATION: A cohort of 8860 clinical pregnancies after embryo transfer (ET) carried out in our center between 2011 and 2016 were retrospectively analyzed for the incidence of MC-DA twinning...
2017: PloS One
https://www.readbyqxmd.com/read/29068507/the-maternal-zygotic-transition-and-zygotic-activation-of-the-mnemiopsis-leidyi-genome-occurs-within-the-first-three-cleavage-cycles
#2
Phillip L Davidson, Bernard J Koch, Christine E Schnitzler, Jonathan Q Henry, Mark Q Martindale, Andreas D Baxevanis, William E Browne
The maternal-zygotic transition (MZT) describes the developmental reprogramming of gene expression marked by the degradation of maternally supplied gene products and activation of the zygotic genome. While the timing and duration of the MZT vary among taxa, little is known about early-stage transcriptional dynamics in the non-bilaterian phylum Ctenophora. We sought to better understand the extent of maternal mRNA loading and subsequent differential transcript abundance during the earliest stages of development by performing comprehensive RNA-sequencing-based analyses of mRNA abundance in single- and eight-cell stage embryos in the lobate ctenophore Mnemiopsis leidyi...
November 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28875934/me31b-globally-represses-maternal-mrnas-by-two-distinct-mechanisms-during-the-drosophila-maternal-to-zygotic-transition
#3
Miranda Wang, Michael Ly, Andrew Lugowski, John D Laver, Howard D Lipshitz, Craig A Smibert, Olivia S Rissland
In animal embryos, control of development is passed from exclusively maternal gene products to those encoded by the embryonic genome in a process referred to as the maternal-to-zygotic transition (MZT). We show that the RNA-binding protein, ME31B, binds to and represses the expression of thousands of maternal mRNAs during the Drosophila MZT. However, ME31B carries out repression in different ways during different phases of the MZT. Early, it represses translation while, later, its binding leads to mRNA destruction, most likely as a consequence of translational repression in the context of robust mRNA decay...
September 6, 2017: ELife
https://www.readbyqxmd.com/read/28829942/zygotic-genome-activation-in-vertebrates
#4
REVIEW
David Jukam, S Ali M Shariati, Jan M Skotheim
The first major developmental transition in vertebrate embryos is the maternal-to-zygotic transition (MZT) when maternal mRNAs are degraded and zygotic transcription begins. During the MZT, the embryo takes charge of gene expression to control cell differentiation and further development. This spectacular organismal transition requires nuclear reprogramming and the initiation of RNAPII at thousands of promoters. Zygotic genome activation (ZGA) is mechanistically coordinated with other embryonic events, including changes in the cell cycle, chromatin state, and nuclear-to-cytoplasmic component ratios...
August 21, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28676122/genome-wide-search-for-zelda-like-chromatin-signatures-identifies-gaf-as-a-pioneer-factor-in-early-fly-development
#5
Arbel Moshe, Tommy Kaplan
BACKGROUND: The protein Zelda was shown to play a key role in early Drosophila development, binding thousands of promoters and enhancers prior to maternal-to-zygotic transition (MZT), and marking them for transcriptional activation. Recently, we showed that Zelda acts through specific chromatin patterns of histone modifications to mark developmental enhancers and active promoters. Intriguingly, some Zelda sites still maintain these chromatin patterns in Drosophila embryos lacking maternal Zelda protein...
July 4, 2017: Epigenetics & Chromatin
https://www.readbyqxmd.com/read/28671979/evolution-and-multiple-roles-of-the-pancrustacea-specific-transcription-factor-zelda-in-insects
#6
Lupis Ribeiro, Vitória Tobias-Santos, Daniele Santos, Felipe Antunes, Geórgia Feltran, Jackson de Souza Menezes, L Aravind, Thiago M Venancio, Rodrigo Nunes da Fonseca
Gene regulatory networks (GRNs) evolve as a result of the coevolutionary processes acting on transcription factors (TFs) and the cis-regulatory modules they bind. The zinc-finger TF zelda (zld) is essential for the maternal-to-zygotic transition (MZT) in Drosophila melanogaster, where it directly binds over thousand cis-regulatory modules to regulate chromatin accessibility. D. melanogaster displays a long germ type of embryonic development, where all segments are simultaneously generated along the whole egg...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28456962/rna-fish-to-study-zygotic-genome-activation-in-early-mouse-embryos
#7
Noémie Ranisavljevic, Ikuhiro Okamoto, Edith Heard, Katia Ancelin
Characterizing the maternal-to-zygotic transition (MZT) is a central question in embryogenesis, and is critical for our understanding of early post-fertilization events in mammals. High-throughput RNA sequencing (RNA Seq) of mouse oocytes and early embryos has recently revealed that elaborate transcription patterns of genes and repeats are established post-fertilization. This occurs in the context of the gradually depleted maternal pool of RNA provided by the oocyte, which can confound the accurate analysis of the zygotic genome activation when the mRNA population is sequenced...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28456956/role-of-micrornas-in-zygotic-genome-activation-modulation-of-mrna-during-embryogenesis
#8
Alessandro Rosa, Ali H Brivanlou
A fundamental process occurring during early development is the zygotic genome activation, i.e., the initiation of transcription from the embryonic genome. Before that step, cellular processes in the developing embryo are dictated by transcripts produced by the maternal genome and accumulated in the egg during oogenesis. The maternal-to-zygotic transition (MZT) involves both the clearance of maternal RNAs and the initiation of transcription of the embryonic genome and is a tightly regulated process. In some species, decay of maternal transcripts may be facilitated by the activity of microRNAs...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28432826/ploidy-has-little-effect-on-timing-early-embryonic-events-in-the-haplo-diploid-wasp-nasonia
#9
Deanna Arsala, Jeremy A Lynch
The nucleocytoplasmic (N/C) ratio plays a prominent role in the maternal-to-zygotic transition (MZT) in many animals. The effect of the N/C ratio on cell-cycle lengthening and zygotic genome activation (ZGA) has been studied extensively in Drosophila, where haploid embryos experience an additional division prior to completing cellularization and triploid embryos cellularize precociously by one division. In this study, we set out to understand how the obligate difference in ploidy in the haplodiploid wasp, Nasonia, affects the MZT and which aspects of the Drosophila MZT are conserved...
May 2017: Genesis: the Journal of Genetics and Development
https://www.readbyqxmd.com/read/28381614/dynamic-rna-protein-interactions-underlie-the-zebrafish-maternal-to-zygotic-transition
#10
Vladimir Despic, Mario Dejung, Mengting Gu, Jayanth Krishnan, Jing Zhang, Lydia Herzel, Korinna Straube, Mark B Gerstein, Falk Butter, Karla M Neugebauer
During the maternal-to-zygotic transition (MZT), transcriptionally silent embryos rely on post-transcriptional regulation of maternal mRNAs until zygotic genome activation (ZGA). RNA-binding proteins (RBPs) are important regulators of post-transcriptional RNA processing events, yet their identities and functions during developmental transitions in vertebrates remain largely unexplored. Using mRNA interactome capture, we identified 227 RBPs in zebrafish embryos before and during ZGA, hereby named the zebrafish MZT mRNA-bound proteome...
July 2017: Genome Research
https://www.readbyqxmd.com/read/28323615/stella-modulates-transcriptional-and-endogenous-retrovirus-programs-during-maternal-to-zygotic-transition
#11
Yun Huang, Jong Kyoung Kim, Dang Vinh Do, Caroline Lee, Christopher A Penfold, Jan J Zylicz, John C Marioni, Jamie A Hackett, M Azim Surani
The maternal-to-zygotic transition (MZT) marks the period when the embryonic genome is activated and acquires control of development. Maternally inherited factors play a key role in this critical developmental process, which occurs at the 2-cell stage in mice. We investigated the function of the maternally inherited factor Stella (encoded by Dppa3) using single-cell/embryo approaches. We show that loss of maternal Stella results in widespread transcriptional mis-regulation and a partial failure of MZT. Strikingly, activation of endogenous retroviruses (ERVs) is significantly impaired in Stella maternal/zygotic knockout embryos, which in turn leads to a failure to upregulate chimeric transcripts...
March 21, 2017: ELife
https://www.readbyqxmd.com/read/28192787/m-6-a-dependent-maternal-mrna-clearance-facilitates-zebrafish-maternal-to-zygotic-transition
#12
Boxuan Simen Zhao, Xiao Wang, Alana V Beadell, Zhike Lu, Hailing Shi, Adam Kuuspalu, Robert K Ho, Chuan He
The maternal-to-zygotic transition (MZT) is one of the most profound and tightly orchestrated processes during the early life of embryos, yet factors that shape the temporal pattern of vertebrate MZT are largely unknown. Here we show that over one-third of zebrafish maternal messenger RNAs (mRNAs) can be N(6)-methyladenosine (m(6)A) modified, and the clearance of these maternal mRNAs is facilitated by an m(6)A-binding protein, Ythdf2. Removal of Ythdf2 in zebrafish embryos decelerates the decay of m(6)A-modified maternal mRNAs and impedes zygotic genome activation...
February 23, 2017: Nature
https://www.readbyqxmd.com/read/28100783/dual-functional-roles-of-molecular-beacon-as-a-microrna-detector-and-inhibitor
#13
Wai Ming Li, Ching-Man Chan, Andrew L Miller, Chow H Lee
MicroRNAs are essential in many cellular processes. The ability to detect microRNAs is important for understanding its function and biogenesis. This study is aimed at using a molecular beacon to detect miR-430 in developing zebrafish embryos as a proof of principle. miR-430 is crucial for the clearance of maternal mRNA during maternal zygotic transition in embryonic development. Despite its known function, the temporal and spatial expression of miR-430 remains unclear. We used various imaging techniques, including laser scanning confocal microscopy, spinning disk, and lightsheet microscopy, to study the localization of miR-430 and any developmental defects possibly caused by the molecular beacon...
March 3, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28073917/the-e3-ubiquitin-ligase-rnf114-and-tab1-degradation-are-required-for-maternal-to-zygotic-transition
#14
Ye Yang, Cheng Zhou, Ying Wang, Weixiao Liu, Chao Liu, Liying Wang, Yujiao Liu, Yongliang Shang, Mingrui Li, Shuai Zhou, Yuanting Wang, Wentao Zeng, Jianli Zhou, Ran Huo, Wei Li
The functional role of the ubiquitin-proteasome pathway during maternal-to-zygotic transition (MZT) remains to be elucidated. Here we show that the E3 ubiquitin ligase, Rnf114, is highly expressed in mouse oocytes and that knockdown of Rnf114 inhibits development beyond the two-cell stage. To study the underlying mechanism, we identify its candidate substrates using a 9,000-protein microarray and validate them using an in vitro ubiquitination system. We show that five substrates could be degraded by RNF114-mediated ubiquitination, including TAB1...
February 2017: EMBO Reports
https://www.readbyqxmd.com/read/27993988/a-mapk-cascade-couples-maternal-mrna-translation-and-degradation-to-meiotic-cell-cycle-progression-in-mouse-oocytes
#15
Qian-Qian Sha, Xing-Xing Dai, Yujiao Dang, Fuchou Tang, Junping Liu, Yin-Li Zhang, Heng-Yu Fan
Mammalian oocyte maturation depends on the translational activation of stored maternal mRNAs upon meiotic resumption. Cytoplasmic polyadenylation element binding protein 1 (CPEB1) is a key oocyte factor that regulates maternal mRNA translation. However, the signal that triggers CPEB1 activation at the onset of mammalian oocyte maturation is not known. We provide evidence that a mitogen-activated protein kinase (MAPK) cascade couples maternal mRNA translation to meiotic cell cycle progression in mouse oocytes by triggering CPEB1 phosphorylation and degradation...
February 1, 2017: Development
https://www.readbyqxmd.com/read/27881336/-outcome-analysis-of-monozygotic-twin-pregnancy-conceived-by-assisted-reproductive-techniques
#16
Shu-Xian Feng, Xue-Lan Li, Xing-Yu Zhou, Yu-Dong Liu, Ping-Ping Guo, De-Sheng Ye, Xin Chen, Shi-Ling Chen
OBJECTIVE: To analyze the incidence, management, and outcomes of monozygotic twin (MZT) pregnancy conceived by assisted reproductive techniques (ART). METHODS: A retrospective analysis was performed of clinical pregnancies after in vitro fertilization and embryo transfer (IVF-ET) and introcytoplasmic sperm injection and embryo transfer (ICSI-ET) from January, 2010 to June 2015 at our center. We investigated the incidence, managements and outcomes of 94 MZT pregnancies...
November 20, 2016: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/27725350/cardiorespiratory-effects-of-isoflurane-in-asiatic-black-bears-ursus-thibetanus-anesthetized-with-intramuscular-medetomidine-and-zolazepam-tiletamine
#17
Dong-Hyuk Jeong, Jeong-Jin Yang, Seong-Hoon Seok, Dong-Joo Song, Seong-Chan Yeon
The objective of this study was to determine the dose-dependent effects of isoflurane on various cardiovascular parameters and the stable range of isoflurane concentrations in Asiatic black bears (Ursus thibetanus). Seven Asiatic black bears were intramuscularly injected with medetomidine, zolazepam and tiletamine (MZT) to induce anesthesia, and anesthesia was maintained by administering isoflurane in 100% oxygen (4 l/min) without mechanical ventilation. Several cardiovascular parameters were measured at five end-tidal isoflurane concentrations (0...
January 20, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/27725165/improved-development-by-melatonin-treatment-after-vitrification-of-mouse-metaphase-ii-oocytes
#18
Yue Zhang, Wei Li, Yongshun Ma, Dian Wang, Xiaoxue Zhao, Changjun Zeng, Ming Zhang, Xianyin Zeng, Qinggang Meng, Guangbin Zhou
The study was aimed to investigate the effect of melatonin on the development potential of mouse MII oocytes after cryopreservation. Mouse MII oocytes were subjected first to vitrification/warming and 2 h of in vitro culture (phase 1), then to parthenogenetic activation (PA) followed by in vitro culture of parthenogenetic embryos (phase 2). Different concentrations of melatonin (0, 10(-9), 10(-6) mol/L) were added to the medium during either phase 1, phase 2 or both phases. The fresh oocytes were used as control...
December 2016: Cryobiology
https://www.readbyqxmd.com/read/27664211/do-arts-affect-the-incidence-of-monozygotic-twinning
#19
I Mateizel, S Santos-Ribeiro, E Done, L Van Landuyt, H Van de Velde, H Tournaye, G Verheyen
STUDY QUESTION: Does the manipulation of gametes or embryos during ARTs increase the risk for monozygotic twinning (MZT)? SUMMARY ANSWER: Frozen embryo transfer (ET) is associated with a lower MZT rate, while blastocyst culture is associated with an increased risk of monozygotic pregnancy. WHAT IS KNOWN ALREADY: Monozygotic twins have a higher risk for perinatal complications. Although an increased incidence of monozygotic pregnancies after ART has been previously reported, data regarding the possible impact of different laboratory procedures are conflicting...
November 2016: Human Reproduction
https://www.readbyqxmd.com/read/27626377/broad-histone-h3k4me3-domains-in-mouse-oocytes-modulate-maternal-to-zygotic-transition
#20
John Arne Dahl, Inkyung Jung, Håvard Aanes, Gareth D Greggains, Adeel Manaf, Mads Lerdrup, Guoqiang Li, Samantha Kuan, Bin Li, Ah Young Lee, Sebastian Preissl, Ingunn Jermstad, Mads Haugland Haugen, Rajikala Suganthan, Magnar Bjørås, Klaus Hansen, Knut Tomas Dalen, Peter Fedorcsak, Bing Ren, Arne Klungland
Maternal-to-zygotic transition (MZT) is essential for the formation of a new individual, but is still poorly understood despite recent progress in analysis of gene expression and DNA methylation in early embryogenesis. Dynamic histone modifications may have important roles in MZT, but direct measurements of chromatin states have been hindered by technical difficulties in profiling histone modifications from small quantities of cells. Recent improvements allow for 500 cell-equivalents of chromatin per reaction, but require 10,000 cells for initial steps or require a highly specialized microfluidics device that is not readily available...
September 22, 2016: Nature
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