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Single step embryo culture

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https://www.readbyqxmd.com/read/29076502/derivation-of-hypermethylated-pluripotent-embryonic-stem-cells-with-high-potency
#1
Siqin Bao, Walfred Wc Tang, Baojiang Wu, Shinseog Kim, Jingyun Li, Lin Li, Toshihiro Kobayashi, Caroline Lee, Yanglin Chen, Mengyi Wei, Shudong Li, Sabine Dietmann, Fuchou Tang, Xihe Li, M Azim Surani
Naive hypomethylated embryonic pluripotent stem cells (ESCs) are developmentally closest to the preimplantation epiblast of blastocysts, with the potential to contribute to all embryonic tissues and the germline, excepting the extra-embryonic tissues in chimeric embryos. By contrast, epiblast stem cells (EpiSCs) resembling postimplantation epiblast are relatively more methylated and show a limited potential for chimerism. Here, for the first time, we reveal advanced pluripotent stem cells (ASCs), which are developmentally beyond the pluripotent cells in the inner cell mass but with higher potency than EpiSCs...
October 27, 2017: Cell Research
https://www.readbyqxmd.com/read/28938744/an-improved-ivm-method-for-cumulus-oocyte-complexes-from-small-follicles-in-polycystic-ovary-syndrome-patients-enhances-oocyte-competence-and-embryo-yield
#2
F Sánchez, F Lolicato, S Romero, M De Vos, H Van Ranst, G Verheyen, E Anckaert, J E J Smitz
STUDY QUESTION: Are meiotic and developmental competence of human oocytes from small (2-8 mm) antral follicles improved by applying an optimized IVM method involving a prematuration step in presence of C-Type Natriuretic Peptide (CNP) followed by a maturation step in presence of FSH and Amphiregulin (AREG)? SUMMARY ANSWER: A strategy involving prematuration culture (PMC) in the presence of CNP followed by IVM using FSH + AREG increases oocyte maturation potential leading to a higher availability of Day 3 embryos and good-quality blastocysts for single embryo transfer...
October 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28913804/doubled-haploid-laboratory-protocol-for-wheat-using-wheat-maize-wide-hybridization
#3
Meenakshi Santra, Hong Wang, Scott Seifert, Scott Haley
In traditional wheat breeding, the uniformity of lines derived from a breeding population is obtained by repeated selfing from the F1 which takes several generations to reach homozygosity in loci controlling traits of interest. Using doubled haploid technology, however, it is possible to attain 100% homozygosity at all loci in a single generation and completely homogeneous breeding lines can be obtained in 1-2 years. Thus, doubled haploid technology may significantly reduce cultivar development time. Two major methods for producing wheat doubled haploids are androgenesis (anther culture and microspore culture) and embryo culture using wheat-maize wide hybridization, the latter being the most effective and widely used method...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28871411/histodifferentiation-of-oil-palm-somatic-embryo-development-at-low-auxin-concentration
#4
M S Pádua, R S Santos, C R G Labory, V C Stein, E G Mendonça, E Alves, L V Paiva
Large-scale propagation of oil palm (Elaeis guineensis, Jacq.) is difficult due to its single apical meristem. Thus, obtaining plants is mainly through seed germination, and a long growing period is required before oil production is possible. An alternative to large-scale seedling production is indirect somatic embryogenesis. The aim of this study was to analyze the somatic embryogenesis process in oil palm (E. guineensis Jacq.) with amino acids and low concentrations of auxins. The Tenera hybrid was analyzed by cytochemical and ultrastructural methods and was used to regenerate oil palm plants...
September 4, 2017: Protoplasma
https://www.readbyqxmd.com/read/28760446/in-vitro-to-in-vivo-extrapolation-of-effective-dosimetry-in-developmental-toxicity-testing-application-of-a-generic-pbk-modelling-approach
#5
Styliani Fragki, Aldert H Piersma, Emiel Rorije, Marco J Zeilmaker
Incorporation of kinetics to quantitative in vitro to in vivo extrapolations (QIVIVE) is a key step for the realization of a non-animal testing paradigm, in the sphere of regulatory toxicology. The use of Physiologically-Based Kinetic (PBK) modelling for determining systemic doses of chemicals at the target site is accepted to be an indispensable element for such purposes. Nonetheless, PBK models are usually designed for a single or a group of compounds and are considered demanding, with respect to experimental data needed for model parameterization...
October 1, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28718081/blastocyst-utilization-rates-after-continuous-culture-in-two-commercial-single-step-media-a-prospective-randomized-study-with-sibling-oocytes
#6
Ioannis A Sfontouris, Efstratios M Kolibianakis, George T Lainas, Christos A Venetis, George K Petsas, Basil C Tarlatzis, Tryfon G Lainas
PURPOSE: The aim of this study is to determine whether blastocyst utilization rates are different after continuous culture in two different commercial single-step media. METHODS: This is a paired randomized controlled trial with sibling oocytes conducted in infertility patients, aged ≤40 years with ≥10 oocytes retrieved assigned to blastocyst culture and transfer. Retrieved oocytes were randomly allocated to continuous culture in either Sage one-step medium (Origio) or Continuous Single Culture (CSC) medium (Irvine Scientific) without medium renewal up to day 5 post oocyte retrieval...
October 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28575413/comprehensive-protocol-of-traceability-during-ivf-the-result-of-a-multicentre-failure-mode-and-effect-analysis
#7
L Rienzi, F Bariani, M Dalla Zorza, E Albani, F Benini, S Chamayou, M G Minasi, L Parmegiani, L Restelli, G Vizziello, A Nanni Costa
STUDY QUESTION: Can traceability of gametes and embryos be ensured during IVF? SUMMARY ANSWER: The use of a simple and comprehensive traceability system that includes the most susceptible phases during the IVF process minimizes the risk of mismatches. WHAT IS KNOWN ALREADY: Mismatches in IVF are very rare but unfortunately possible with dramatic consequences for both patients and health care professionals. Traceability is thus a fundamental aspect of the treatment...
August 1, 2017: Human Reproduction
https://www.readbyqxmd.com/read/28526029/cell-fixation-and-preservation-for-droplet-based-single-cell-transcriptomics
#8
Jonathan Alles, Nikos Karaiskos, Samantha D Praktiknjo, Stefanie Grosswendt, Philipp Wahle, Pierre-Louis Ruffault, Salah Ayoub, Luisa Schreyer, Anastasiya Boltengagen, Carmen Birchmeier, Robert Zinzen, Christine Kocks, Nikolaus Rajewsky
BACKGROUND: Recent developments in droplet-based microfluidics allow the transcriptional profiling of thousands of individual cells in a quantitative, highly parallel and cost-effective way. A critical, often limiting step is the preparation of cells in an unperturbed state, not altered by stress or ageing. Other challenges are rare cells that need to be collected over several days or samples prepared at different times or locations. METHODS: Here, we used chemical fixation to address these problems...
May 19, 2017: BMC Biology
https://www.readbyqxmd.com/read/28266932/should-we-forget-about-embryos-till-day-5
#9
Fernando Bronet, David Agudo
PURPOSE OF REVIEW: To find the way of having more and better blastocyst is essential. How to culture embryos up to blastocyst stage remains critical. RECENT FINDINGS: Several studies show how a blastocyst score can predict the implantation potential. If that score is enough to choose the best blastocyst, as culture conditions would not be affected in these days, we would not need to check early cleavage embryos, even it could be better for the embryo development...
June 2017: Current Opinion in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28238490/composition-of-single-step-media-used-for-human-embryo-culture
#10
COMPARATIVE STUDY
Dean E Morbeck, Nikola A Baumann, Devin Oglesbee
OBJECTIVE: To determine compositions of commercial single-step culture media and test with a murine model whether differences in composition are biologically relevant. DESIGN: Experimental laboratory study. SETTING: University-based laboratory. ANIMAL(S): Inbred female mice were superovulated and mated with outbred male mice. INTERVENTION(S): Amino acid, organic acid, and ions content were determined for single-step culture media: CSC, Global, G-TL, and 1-Step...
April 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/27916207/integrating-insulin-into-single-step-culture-medium-regulates-human-embryo-development-in%C3%A2-vitro
#11
RANDOMIZED CONTROLLED TRIAL
Mohamed Fawzy, Mohamed Sabry, Mohamed Nour, Mohamed Y Abdelrahman, Eman Roshdy, Yasmin Magdi, Hazem Abdelghafar
OBJECTIVE: To evaluate the effect of supplementing single-step embryo culture medium with insulin on human embryo development. DESIGN: Comparative study. SETTING: Two private centers. PATIENT(S): The study involved a sibling oocyte split of 5,142 retrieved oocytes from 360 patients. INTERVENTION(S): Sibling oocytes split after intracytoplasmic sperm injection for culture from day 0 through day 5 or 6 in insulin-supplemented or control medium...
February 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/27855520/novel-technologies-emerging-for-preimplantation-genetic-diagnosis-and-preimplantation-genetic-testing-for-aneuploidy
#12
REVIEW
Karen Sermon
Preimplantation genetic diagnosis (PGD) was introduced as an alternative to prenatal diagnosis: embryos cultured in vitro were analysed for a monogenic disease and only disease-free embryos were transferred to the mother, to avoid the termination of pregnancy with an affected foetus. It soon transpired that human embryos show a great deal of acquired chromosomal abnormalities, thought to explain the low success rate of IVF - hence preimplantation genetic testing for aneuploidy (PGT-A) was developed to select euploid embryos for transfer...
January 2017: Expert Review of Molecular Diagnostics
https://www.readbyqxmd.com/read/27823786/non-invasive-metabolomics-for-improved-determination-of-embryonic-sex-markers-in-chemically-defined-culture-medium
#13
E Gómez, M Muñoz, C Simó, C Ibáñez, S Carrocera, D Martín-González, A Cifuentes
Metabolic differences between early male and female embryos can be reflected in culture medium (CM). We used a single bovine embryo culture step (24h) supporting improved birth rates under chemically defined conditions (CDC) to investigate biomarker detection of embryonic sex in contrast to classical BSA-containing medium. In vitro matured slaughterhouse oocytes were fertilized in vitro with a single bull. Embryos were initially cultured in synthetic oviduct fluid with BSA. On day-6, morulae were cultured individually in droplets with (BSA) or without protein (CDC)...
November 25, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27678484/microfluidics-for-mammalian-embryo-culture-and-selection-where-do-we-stand-now
#14
Séverine Le Gac, Verena Nordhoff
The optimization of in-vitro culture conditions and the selection of the embryo(s) with the highest developmental competence are essential components in an ART program. Culture conditions are manifold and they underlie not always evidence-based research but also trends entering the IVF laboratory. At the moment, the idea of using sequential media according to the embryo requirements has been given up in favor of the use of single step media in an uninterrupted manner due to practical issues such as time-lapse incubators...
April 1, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/27491772/blastocyst-culture-using-single-versus-sequential-media-in-clinical-ivf-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#15
REVIEW
Ioannis A Sfontouris, Wellington P Martins, Carolina O Nastri, Iara G R Viana, Paula A Navarro, Nick Raine-Fenning, Sheryl van der Poel, Laura Rienzi, Catherine Racowsky
PURPOSE: The purpose of this study was to undertake a review of the available evidence comparing the use of a single medium versus sequential media for embryo culture to the blastocyst stage in clinical IVF. METHODS: We searched the Cochrane Central, PubMed, Scopus, ClinicalTrials.gov, Current Controlled Trials and WHO International Clinical Trials Registry Platform to identify randomized controlled trials comparing single versus sequential media for blastocyst culture and ongoing pregnancy rate...
October 2016: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/27423665/implementing-pgd-pgd-a-in-ivf-clinics-considerations-for-the-best-laboratory-approach-and-management
#16
REVIEW
Antonio Capalbo, Valeria Romanelli, Danilo Cimadomo, Laura Girardi, Marta Stoppa, Lisa Dovere, Domenico Dell'Edera, Filippo Maria Ubaldi, Laura Rienzi
For an IVF clinic that wishes to implement preimplantation genetic diagnosis for monogenic diseases (PGD) and for aneuploidy testing (PGD-A), a global improvement is required through all the steps of an IVF treatment and patient care. At present, CCS (Comprehensive Chromosome Screening)-based trophectoderm (TE) biopsy has been demonstrated as a safe, accurate and reproducible approach to conduct PGD-A and possibly also PGD from the same biopsy. Key challenges in PGD/PGD-A implementation cover genetic and reproductive counselling, selection of the most efficient approach for blastocyst biopsy as well as of the best performing molecular technique to conduct CCS and monogenic disease analysis...
October 2016: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/27421614/cleavage-stage-or-blastocyst-transfer-what-are-the-benefits-and-harms
#17
REVIEW
Demián Glujovsky, Cynthia Farquhar
ET is a critical step in an assisted reproduction cycle. Over the past decade there has been an increasing trend to extending culture from cleavage-stage to blastocyst transfer. There has also been a trend to single ET and reporting the success of an assisted reproductive cycle as a cumulative live-birth rate after using both fresh and frozen embryos. There is low evidence that fresh blastocyst transfer is associated with improved live-birth rates compared with fresh cleavage-stage embryos. However, in the few studies that report cumulative pregnancy rates after fresh and frozen transfers, no significant difference was found...
August 2016: Fertility and Sterility
https://www.readbyqxmd.com/read/27179264/bisphenol-a-in-culture-media-and-plastic-consumables-used-for-art
#18
N Gatimel, M Z Lacroix, S Chanthavisouk, N Picard-Hagen, V Gayrard, J Parinaud, R D Léandri
STUDY QUESTION: Do the embryo culture media and plastic materials used during assisted reproductive technology (ART) laboratory procedures expose embryos to bisphenol A (BPA)? SUMMARY ANSWER: BPA was not detected in embryo culture media or protein supplements at concentrations above those encountered in normal patient serum and follicular fluids. WHAT IS KNOWN ALREADY: BPA is strongly suspected of altering the epigenome during mammalian development...
July 2016: Human Reproduction
https://www.readbyqxmd.com/read/27101515/quantification-of-cancer-cell-extravasation-in-vivo
#19
Yohan Kim, Karla C Williams, Carson T Gavin, Emily Jardine, Ann F Chambers, Hon S Leong
Cancer cell 'invasiveness' is one of the main driving forces in cancer metastasis, and assays that quantify this key attribute of cancer cells are crucial in cancer metastasis research. The research goal of many laboratories is to elucidate the signaling pathways and effectors that are responsible for cancer cell invasion, but many of these experiments rely on in vitro methods that do not specifically simulate individual steps of the metastatic cascade. Cancer cell extravasation is arguably the most important example of invasion in the metastatic cascade, whereby a single cancer cell undergoes transendothelial migration, forming invasive processes known as invadopodia to mediate translocation of the tumor cell from the vessel lumen into tissue in vivo...
May 2016: Nature Protocols
https://www.readbyqxmd.com/read/27008092/does-embryo-culture-medium-influence-the-health-and-development-of-children-born-after-in-vitro-fertilization
#20
Céline Bouillon, Roger Léandri, Laurent Desch, Alexandra Ernst, Céline Bruno, Charline Cerf, Alexandra Chiron, Céline Souchay, Antoine Burguet, Clément Jimenez, Paul Sagot, Patricia Fauque
In animal studies, extensive data revealed the influence of culture medium on embryonic development, foetal growth and the behaviour of offspring. However, this impact has never been investigated in humans. For the first time, we investigated in depth the effects of embryo culture media on health, growth and development of infants conceived by In Vitro Fertilization until the age of 5 years old. This single-centre cohort study was based on an earlier randomized study. During six months, in vitro fertilization attempts (No...
2016: PloS One
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