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https://www.readbyqxmd.com/read/28704794/genetic-engineering-as-a-tool-for-the-generation-of-mouse-models-to-understand-disease-phenotypes-and-gene-function
#1
REVIEW
Ann-Kathrin Baumgart, Marc Beyer
The usage of mouse models has been vital for biomedical research over the last decades, yet the generation of these models has been extremely difficult and labor-intensive. The identification and generation of nucleases able to introduce site-specific DNA double-strand breaks, particularly the CRIPSR/Cas system, is a major breakthrough for this field as the endogenous DNA repair machinery can be hijacked to specifically introduce genome modifications at these sites. This allows for the time-efficient and cost-efficient generation of mouse models by delivery of designer nucleases together with donor DNA into fertilized oocytes...
July 10, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28689997/dynamic-reorganization-of-nucleosome-positioning-in-somatic-cells-after-transfer-into-porcine-enucleated-oocytes
#2
Chenyu Tao, Juan Li, Xia Zhang, Baobao Chen, Daming Chi, Yaqiong Zeng, Yingjie Niu, Chengfei Wang, Wei Cheng, Wangjun Wu, Zengxiang Pan, Jinmin Lian, Honglin Liu, Yi-Liang Miao
The nucleosome, the fundamental structural unit of chromatin, is a critical regulator of gene expression. The mechanisms governing changes to nucleosome occupancy and positioning during somatic cell reprogramming remain poorly understood. We established a method for generating genome-wide nucleosome maps of porcine embryonic fibroblasts (PEF), reconstructed 1-cell embryos generated by somatic cell nuclear transfer (SCNT), and fertilized zygotes (FZ) using MNase sequencing with only 1,000 cells. We found that donor PEF chromatin, especially X chromosome, became more open after transfer into porcine oocytes and nucleosome occupancy decreased in promoters but increased in the genic regions...
July 3, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/28688923/paraoxonase-activities-in-human-follicular-fluid-role-in-follicular-maturation
#3
Susana Meijide, Irantzu Pérez-Ruiz, M Luisa Hernández, Rosaura Navarro, Marcos Ferrando, Zaloa Larreategui, José-Ignacio Ruiz-Sanz, M Begoña Ruiz-Larrea
The paraoxonases (PONs) are antioxidant enzymes associated with beneficial effects against several diseases and some exposures. Little is known, however, about the role of PONs in human reproduction. This work was conducted to investigate whether any association existed between the activities of the PON enzymes (1, 2, and 3) with the follicular size and fertility parameters in assisted reproduction. The study included 100 subfertile women (patients) and 55 proven fertile women (oocyte donors), all undergoing an ovarian stimulation cycle...
June 22, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28687207/high-risk-of-preterm-birth-and-low-birth-weight-after-oocyte-donation-ivf-analysis-of-133-785-live-births
#4
Mohan Shashikant Kamath, Belavendra Antonisamy, Mariano Mascarenhas, Sesh Kamal Sunkara
A higher risk of pregnancy complications occurs after assisted reproductive techniques compared with spontaneously conceived pregnancies. This is attributed to the underlying infertility and assisted reproduction technique procedures involved during treatment. It is a matter of interest whether use of donor oocytes affects perinatal outcomes compared with pregnancies after autologous IVF. Anonymized data were obtained from the Human Fertilization and Embryology Authority. The analysis included 5929 oocyte donation and 127,856 autologous IVF live births...
June 22, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28669480/predictive-factors-for-live-birth-in-donor-oocyte-recipient-cycles
#5
EDITORIAL
Nigel Pereira, Isaac Kligman
No abstract text is available yet for this article.
June 29, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28663368/betaine-is-accumulated-via-transient-choline-dehydrogenase-activation-during-mouse-oocyte-meiotic-maturation
#6
Taylor McClatchie, Megan Meredith, Mariame O Ouédraogo, Sandy Slow, Michael Lever, Mellissa R W Mann, Steven H Zeisel, Jacquetta M Trasler, Jay M Baltz
Betaine (N,N,N-trimethylglycine) plays key roles in mouse eggs and preimplantation embryos first in a novel mechanism of cell volume regulation and second as a major methyl donor in blastocysts, but its origin is unknown. Here, we determined that endogenous betaine was present at low levels in germinal vesicle (GV) stage mouse oocytes before ovulation, but reached high levels in the mature, ovulated egg. However, no betaine transport into oocytes was detected during meiotic maturation. Since betaine can be synthesized in mammalian cells via choline dehydrogenase (CHDH; EC1...
June 29, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28662882/ovum-pick-up-interval-in-buffalo-bubalus-bubalis-managed-under-wetland-conditions-in-argentina-effect-on-follicular-population-oocyte-recovery-and-in-vitro-embryo-development
#7
J Konrad, G Clérico, M J Garrido, G Taminelli, M Yuponi, R Yuponi, G Crudeli, M Sansinena
The excellent adaptation of water buffalo (Bubalis bubalis) to swampy environments means that animals are frequently managed in areas with restricted access for reproductive procedures. The objective of this study was to evaluate the effect of the ovum pick-up (OPU) interval on follicular population, oocyte recovery, oocyte quality and in vitro embryo production. Twelve Murrah buffaloes were subjected to two consecutive dominant follicle reductions, and randomly assigned to either 7-day (n=6) or 14-day (n=6) OPU interval groups...
June 20, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28658951/qualitative-and-quantitative-analysis-of-proteome-and-peptidome-of-human-follicular-fluid-using-multiple-samples-from-single-donor-with-lc-ms-and-swath-methodology
#8
Aleksandra Ewa Lewandowska, Katarzyna Macur, Paulina Czaplewska, Joanna Liss, Krzysztof Łukaszuk, Stanislaw Oldziej
Human follicular fluid (hFF) is a natural environment of oocyte maturation, and some components of hFF could be used to judge oocyte capability for fertilization and further development. In our pilot small scale study three samples from four donors (12 samples in total) were analyzed to determine which hFF proteins/peptides could be used to differentiate individual oocytes and which are patient specific. Ultrafiltration was used to fractionate hFF to High Molecular Weight (HMW) - proteome (>10kDa) and Low Molecular Weight (LMW) - peptidome (<10 kDa) fractions...
June 28, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28656538/the-dilemma-of-counseling-patients-about-poor-prognosis-live-birth-after-ivf-with-autologous-oocytes-in-a-43-year-old-woman-with-fsh-levels-above-30%C3%A2-miu-ml
#9
Heather R Burks, Marsha Baker, Alexander M Quaas, Kristin A Bendikson, Karine Chung, Richard J Paulson
Providing reasonable expectations to patients with diminished ovarian reserve prior to attempting pregnancy through in vitro fertilization (IVF) is one of the most challenging aspects of fertility care. In some instances, advice from the clinician to pursue more effective treatment, such as donor oocytes, may not be acceptable to the patient. In this case report, a patient is presented who represents a poor prognosis candidate for IVF treatment. She was 43 years old with six prior failed IVF cycles and repetitive basal FSH values above 30 mIU/mL...
June 27, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28651653/influence-of-nitric-oxide-and-phosphodiesterases-during-in-vitro-maturation-of-bovine-oocytes-on-meiotic-resumption-and-embryo-production
#10
Ramon Cesar Botigelli, Katia Lancellotti Schwarz, Fabiane Gilli Zaffalon, Maite Del Collado, Fernanda Cavallari Castro, Hugo Fernandes, Claudia Lima Verde Leal
This study aimed to examine the effects of nitric oxide (NO) and different phosphodiesterase (PDE) families on meiosis resumption, nucleotides levels and embryo production. Experiment I, COCs were matured in vitro with the NO donor S-nitroso-N-acetylpenicillamine (SNAP) associated or not with the soluble guanylate cyclase (sGC) inhibitor 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), meiotic resumption and nucleotides levels were assessed. SNAP delayed germinal vesicle breakdown (GVBD) (53.4 ± 1.2 versus 78...
June 27, 2017: Zygote: the Biology of Gametes and Early Embryos
https://www.readbyqxmd.com/read/28643089/time-lapse-observation-and-transcriptome-analysis-of-a-case-with-repeated-multiple-pronuclei-after-ivf-icsi
#11
J Dai, L Z Leng, C F Lu, F Gong, S P Zhang, W Zheng, G X Lu, G Lin
PURPOSE: The purpose of this study was to investigate the cause of repeated multipronucleus (MPN) formation in zygotes in a patient after both in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI). METHOD: This is a case study. A patient had unexplained primary infertility with recurring total MPN zygotes after IVF and ICSI cycles. Time-lapse monitoring of pronucleus formation was carried out. Embryos developed from MPN zygotes were analyzed by fluorescence in situ hybridization (FISH)...
June 22, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28625761/impact-of-vitamin-d-levels-on-ovarian-reserve-and-ovarian-response-to-ovarian-stimulation-in-oocyte-donors
#12
Alberta Maria Fabris, Maria Cruz, Carlos Iglesias, Alberto Pacheco, Azadeh Patel, Jayesh Patel, Human Fatemi, Juan Antonio García-Velasco
Recently, growing interest in vitamin D has emerged from findings that demonstrate a low vitamin D status in populations. Similarly, much interest has been shown in the role that anti-Müllerian hormone (AMH) plays in reproductive physiology. Considerable confusion as to whether vitamin D status is related to ovarian function can be found in the literature. Our retrospective study was performed from June 2014 to April 2015. Oocyte donors were recruited and stimulated under the antagonist protocol with gonadotrophin-releasing hormone (GnRH) agonist to trigger ovulation...
May 19, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28619101/in-vitro-production-of-bovine-embryos-derived-from-individual-donors-in-the-corral-%C3%A2-dish
#13
Maaike Catteeuw, Eline Wydooghe, Erik Mullaart, Hiemke M Knijn, Ann Van Soom
BACKGROUND: Since the identity of the embryo is of outmost importance during commercial in vitro embryo production, bovine oocytes and embryos have to be cultured strictly per donor. Due to the rather low yield of oocytes collected after ovum pick-up (OPU) per individual cow, oocyte maturation and embryo culture take place in small groups, which is often associated with inferior embryo development. The objective of this study was to improve embryonic development in small donor groups by using the Corral(®) dish...
June 15, 2017: Acta Veterinaria Scandinavica
https://www.readbyqxmd.com/read/28617148/outcomes-of-ivf-cycles-coupled-with-pgs-by-acgh-of-embryos-from-donor-and-autologous-oocytes-transferred-after-vitrification-to-women-of-advanced-maternal-age
#14
Elena M Fedorova, Svetlana A Shlykova, Ksenia V Shunkina, Olga G Zaitceva, Elena N Lapina, Taras V Yanchuk, Alla S Kalugina
It is well documented that aneuploidy rate in preimplantation embryos increases with the mother's age, and at the same time the number of oocytes diminishes. Consequently, for patients of advanced maternal age two options are available to overcome these limitations: use of oocytes from young donors, or use of own oocytes coupled with preimplantation genetic screening (PGS) for 24 chromosomes. However, it is not clear which strategy might be more effective. The aim of this retrospective study was to evaluate outcomes of IVF cycles coupled with transfer of vitrified embryos from donor or autologous oocytes, both with or without PGS...
June 15, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28601410/total-number-of-oocytes-and-zygotes-are-predictive-of-live-birth-pregnancy-in-fresh-donor-oocyte-in%C3%A2-vitro-fertilization-cycles
#15
Eduardo Hariton, Keewan Kim, Sunni L Mumford, Marissa Palmor, Pietro Bortoletto, Eden R Cardozo, Anatte E Karmon, Mary E Sabatini, Aaron K Styer
OBJECTIVE: To evaluate the association of oocyte donor-recipient characteristics, oocyte donor response, and live birth pregnancy rate following fresh donor oocyte IVF-ET. DESIGN: Retrospective cohort study. SETTING: Academic reproductive medicine practice. PATIENT(S): Two hundred thirty-seven consecutive fresh donor oocyte IVF-ET cycles from January 1, 2007 to December 31, 2013 at the Massachusetts General Hospital Fertility Center...
June 7, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28595591/effect-of-race-and-ethnicity-on-utilization-and-outcomes-of-assisted-reproductive-technology-in-the-usa
#16
Alice J Shapiro, Sarah K Darmon, David H Barad, David F Albertini, Norbert Gleicher, Vitaly A Kushnir
BACKGROUND: The purpose of this study was to determine the utilization and live birth rates of assisted reproductive technology (ART) modalities among various racial and ethnic groups in recent years. METHODS: We reviewed ART data reported to the Society for Assisted Reproductive Technologies Clinic Outcome Reporting System (SART CORS) for autologous ART and third-party ART (3ART) cycles which involved donor oocytes, sperm, embryos and gestational carrier, performed in the U...
June 8, 2017: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/28595284/infertility-diagnosis-has-a-significant-impact-on-the-transcriptome-of-developing-blastocysts
#17
Blair R McCallie, Jason C Parks, Darren K Griffin, William B Schoolcraft, Mandy G Katz-Jaffe
STUDY QUESTION: Is the human blastocyst transcriptome associated with infertility diagnosis, specifically: polycystic ovaries (PCO), male factor (MF), and unexplained (UE)? SUMMARY ANSWER: The global blastocyst transcriptome was significantly altered in association with a PCO, MF, and UE infertility diagnosis. WHAT IS KNOWN ALREADY: Infertility diagnosis has an impact on the probability for a successful outcome following an IVF cycle. Limited information is known regarding the relationship between a specific infertility diagnosis and blastocyst transcription during pre-implantation development...
June 8, 2017: Molecular Human Reproduction
https://www.readbyqxmd.com/read/28579040/autonomy-and-self-esteem-of-women-who-donate-to-an-oocyte-cryopreservation-bank-in-the-netherlands
#18
Marjolein R Bakker, Joyce Maas, Marrie H Bekker, Annelien L Bredenoord, Bart C Fauser, Annelies M Bos
Worldwide, oocyte donors donate voluntarily or receive varying amounts of money for donation. This raises ethical questions regarding the appropriateness of financial compensation, and the possibility of undue inducement and exploitation of oocyte donors. Are these donors capable of making an independent, well-considered decision? Regarding this matter, it is important to examine aspects such as autonomy-connectedness and self-esteem. In this cross-sectional study, demographic characteristics and donation motivations were assessed in 92 women who attended the University Medical Center (UMC) Utrecht as potential oocyte donors between June 2012 and July 2016...
May 17, 2017: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/28574624/proper-reprogramming-of-imprinted-and-non-imprinted-genes-in-cloned-cattle-gametogenesis
#19
Masahiro Kaneda, Shinya Watanabe, Satoshi Akagi, Yasushi Inaba, Masaya Geshi, Takashi Nagai
Epigenetic abnormalities in cloned animals are caused by incomplete reprogramming of the donor nucleus during the nuclear transfer step (first reprogramming). However, during the second reprogramming step that occurs only in the germline cells, epigenetic errors not corrected during the first step are repaired. Consequently, epigenetic abnormalities in the somatic cells of cloned animals should be erased in their spermatozoa or oocytes. This is supported by the fact that offspring from cloned animals do not exhibit defects at birth or during postnatal development...
June 2, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28571815/hypothesis-co-transfer-of-genuine-embryos-and-implantation-promoting-compounds-via-artificial-containers-improve-endometrium-receptivity
#20
Onder Celik, Mustafa Acet, Sudenaz Celik, Levent Sahin, Onder Koc, Nilufer Celik
As with other organs endometrial functions are altered with the advancing age. Age related decrease in reproductive functions leads to decline in the number of oocytes retrieved and the synthesis of endometrial receptivity molecules. Despite the significant improvement in assisted reproductive technologies we do not have so many options to enhance endometrial receptivity. Due to lack of drugs having endometrium receptivity enhancement properties, oocyte donation seems to be the only solution for women with implantation failure...
June 2017: Medical Hypotheses
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