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https://www.readbyqxmd.com/read/27932551/antigen-unmasking-enhances-visualization-efficacy-of-the-oocyte-activation-factor-phospholipase-c-zeta-in-mammalian-sperm
#1
Junaid Kashir, Luke Buntwal, Michail Nomikos, Brian L Calver, Panagiotis Stamatiadis, Peter Ashley, Vyronia Vassilakopoulou, David Sanders, Paul Knaggs, Evangelia Livaniou, Adnan Bunkheila, Karl Swann, F Anthony Lai
STUDY QUESTION: Is it possible to improve clinical visualization of phospholipase C zeta (PLCζ) as a diagnostic marker of sperm oocyte activation capacity and male fertility? SUMMARY ANSWER: Poor PLCζ visualization efficacy using current protocols may be due to steric or conformational occlusion of native PLCζ, hindering antibody access, and is significantly enhanced using antigen unmasking/retrieval (AUM) protocols. WHAT IS KNOWN ALREADY: Mammalian oocyte activation is mediated via a series of intracellular calcium (Ca(2+)) oscillations induced by sperm-specific PLCζ...
December 8, 2016: Molecular Human Reproduction
https://www.readbyqxmd.com/read/27919073/mitochondrial-replacement-in-human-oocytes-carrying-pathogenic-mitochondrial-dna-mutations
#2
Eunju Kang, Jun Wu, Nuria Marti Gutierrez, Amy Koski, Rebecca Tippner-Hedges, Karen Agaronyan, Aida Platero-Luengo, Paloma Martinez-Redondo, Hong Ma, Yeonmi Lee, Tomonari Hayama, Crystal Van Dyken, Xinjian Wang, Shiyu Luo, Riffat Ahmed, Ying Li, Dongmei Ji, Refik Kayali, Cengiz Cinnioglu, Susan Olson, Jeffrey Jensen, David Battaglia, David Lee, Diana Wu, Taosheng Huang, Don P Wolf, Dmitry Temiakov, Juan Carlos Izpisua Belmonte, Paula Amato, Shoukhrat Mitalipov
Maternally inherited mitochondrial (mt)DNA mutations can cause fatal or severely debilitating syndromes in children, with disease severity dependent on the specific gene mutation and the ratio of mutant to wild-type mtDNA (heteroplasmy) in each cell and tissue. Pathogenic mtDNA mutations are relatively common, with an estimated 778 affected children born each year in the United States. Mitochondrial replacement therapies or techniques (MRT) circumventing mother-to-child mtDNA disease transmission involve replacement of oocyte maternal mtDNA...
December 8, 2016: Nature
https://www.readbyqxmd.com/read/27907920/aneuploidy-detection-and-mtdna-quantification-in-bovine-embryos-with-different-cleavage-onset-using-a-next-generation-sequencing-based-protocol
#3
Miroslav Hornak, David Kubicek, Petr Broz, Pavlina Hulinska, Katerina Hanzalova, Darren Griffin, Marie Machatkova, Jiri Rubes
Bovine embryos are now routinely used in agricultural systems as a means of disseminating superior genetics worldwide, ultimately with the aim of feeding an ever-growing population. Further investigations, common for human IVF embryos, thus have priority to improve cattle IVF, as has screening for aneuploidy (abnormal chromosome number). Although the incidence and consequences of aneuploidy are well documented in human preimplantation embryos, they are less well known for the embryos of other animals. To address this, we assessed aneuploidy levels in thirty-one 2-cell bovine embryos derived from early- and late-cleaving zygotes...
December 2, 2016: Cytogenetic and Genome Research
https://www.readbyqxmd.com/read/27856185/utilization-of-third-party-in%C3%A2-vitro-fertilization-in-the-united%C3%A2-states
#4
Vitaly A Kushnir, Sarah K Darmon, Alice J Shapiro, David F Albertini, David H Barad, Norbert Gleicher
BACKGROUND: The use of in vitro fertilization that includes third-party in vitro fertilization is increasing. However, the relative contribution of third-party in vitro fertilization that includes the use of donor oocytes, sperm, or embryo and a gestational carrier to the birth cohort after in vitro fertilization is unknown. OBJECTIVE: The purpose of this study was to examine the contribution of third-party in vitro fertilization to the in vitro fertilization birth cohort over the past decade...
November 14, 2016: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/27852688/the-role-of-intracytoplasmic-sperm-injection-in-non-male-factor-infertility-in-advanced-maternal-age
#5
Samer Tannus, Weon-Young Son, Ashley Gilman, Grace Younes, Tal Shavit, Michael-Haim Dahan
STUDY QUESTION: Does ICSI improve reproductive outcomes compared with conventional IVF when used for non-male factor infertility in women aged 40 years and over? SUMMARY ANSWER: There is no advantage of ICSI over conventional IVF in women aged 40 years and over when used for non-male factor infertility. WHAT IS KNOWN ALREADY: The use of ICSI has increased dramatically in recent years and is being applied for indications other than male factor infertility...
November 16, 2016: Human Reproduction
https://www.readbyqxmd.com/read/27842997/cryopreserved-oocyte-versus-fresh-oocyte-assisted-reproductive-technology-cycles-united-states-2013
#6
Sara Crawford, Sheree L Boulet, Jennifer F Kawwass, Denise J Jamieson, Dmitry M Kissin
OBJECTIVE: To compare characteristics, explore predictors, and compare assisted reproductive technology (ART) cycle, transfer, and pregnancy outcomes of autologous and donor cryopreserved oocyte cycles with fresh oocyte cycles. DESIGN: Retrospective cohort study from the National ART Surveillance System. SETTING: Fertility treatment centers. PATIENT(S): Fresh embryo cycles initiated in 2013 utilizing embryos created with fresh and cryopreserved, autologous and donor oocytes...
November 11, 2016: Fertility and Sterility
https://www.readbyqxmd.com/read/27821591/rest-is-required-for-nuclear-reprogramming-by-inhibiting-tgf%C3%AE-signaling-pathway
#7
Qing-Ran Kong, Bing-Teng Xie, Heng Zhang, Jing-Yu Li, Tian-Qing Huang, Ren-Yue Wei, Zhong-Hua Liu
Differentiated cells can be reprogrammed by transcription factors, and these factors that are responsible for successful reprogramming need to be further identified. Here, we show that the neuronal repressor REST is rich in porcine oocytes and requires for nuclear transfer (NT)-mediated reprogramming through inhibiting TGFβ signaling pathway. REST was dramatically degraded after oocyte activation, but the residual REST was incorporated into the transferred donor nuclei during reprogramming in NT embryos. Inhibition of REST function in oocytes compromised the development of NT embryos but not that of IVF and PA embryos...
November 7, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27815560/nitric-oxide-no-stimulates-steroidogenesis-and-folliculogenesis-in-fish
#8
Vinay Kumar Singh, Bechan Lal
The present study was undertaken to understand the physiological significance of the existence of nitric oxide synthase (NOS)/nitric oxide (NO) system in fish ovary. For this, two doses of NO donor, sodium nitroprusside (SNP, 25 µg and 50 µg) and NOS inhibitor, N-nitro-l-arginine methyl ester (l-NAME, 50 µg and 100 µg)/100 g body weight were administered during the two reproductive phases of reproductive cycle of the Clarias batrachus During the late-quiescence phase, high dose of l-NAME decreased the NO, testosterone, 17β-estradiol, vitellogenin contents in serum and ovary and activities of 5-ene-3β-hydroxysteroid dehydrogenases (3β-HSD) and 17β-hydroxysteroid dehydrogenases (17β-HSD) in ovary, whereas higher dose of SNP increased these parameters...
February 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/27803583/use-of-clomiphene-based-stimulation-protocol-in-oocyte-donors-a-comparative-study
#9
Aparna Singh, Shilpa Bhandari, Pallavi Agrawal, Nitika Gupta, Niharika Munaganuru
INTRODUCTION: This study was undertaken to compare between clomiphene citrate (CC) and gonadotropin-releasing hormone antagonist-based protocols in donor-recipient cycles in terms of parameters of ovarian stimulation and obstetric outcome. MATERIALS AND METHODS: Two hundred and three fertile oocyte donors were stimulated using two different protocols: Clomiphene based (n = 103) and antagonist based (n = 100). Donors in the one group were stimulated from day 1 or 2 of spontaneous or withdrawal bleeds with CC (50 mg/day) and recombinant follicle-stimulating hormone (FSH) till the day of trigger while donors in the other group were stimulated using recombinant FSH from day 1 or 2, and the antagonist was added as per flexible antagonist protocol...
July 2016: Journal of Human Reproductive Sciences
https://www.readbyqxmd.com/read/27789184/a-limited-survey-based-uncontrolled-follow-up-study-of-children-born-after-ooplasmic-transplantation-in-a-single-centre
#10
Serena H Chen, Claudia Pascale, Maria Jackson, Mary Ann Szvetecz, Jacques Cohen
Experimental ooplasmic transplantation from donor to recipient oocyte took place between 1996 and 2001 at Saint Barnabas Medical Center, USA. Indication for 33 patients was repeated implantation failure. Thirteen couples had 17 babies. One patient delivered twins from mixed ooplasmic and donor egg embryos. A limited survey-based follow-up study on the children is reported: 12 out of 13 parents completed a questionnaire on pregnancy, birth, health, academic performance and disclosure. Parents of a quadruplet did not participate...
October 24, 2016: Reproductive Biomedicine Online
https://www.readbyqxmd.com/read/27769207/neonatal-outcomes-in-pregnancies-resulting-from-oocyte-donation-a-cohort-study-in-sweden
#11
Evangelia Elenis, Gunilla Sydsjö, Alkistis Skalkidou, Claudia Lampic, Agneta Skoog Svanberg
BACKGROUND: Pregnancies resulting through oocyte donation have been associated with increased risk for adverse outcomes for the mother, such as gestational hypertensive disorders. However, little is known about possible neonatal complications of such pregnancies. The purpose of this study was to evaluate the neonatal health outcomes among singleton pregnancies in a population of relatively young and healthy oocyte recipients in Sweden, taking into account the medical indication leading to treatment...
October 21, 2016: BMC Pediatrics
https://www.readbyqxmd.com/read/27764913/influences-of-somatic-donor-cell-sex-on-in-vitro-and-in-vivo-embryo-development-following-somatic-cell-nuclear-transfer-in-pigs
#12
Jae Gyu Yoo, Byeong-Woo Kim, Mi-Rung Park, Deug-Nam Kwon, Yun-Jung Choi, Teak-Soon Shin, Byung-Wook Cho, Jakyeom Seo, Jin-Hoi Kim, Seong-Keun Cho
Objective: The present study investigates pre- and post-implantation developmental competence of nuclear-transferred porcine embryos derived from male and female fetal fibroblasts. Methods: Male and female fetal fibroblasts were transferred to in vitro-matured enucleated oocytes and in vitro and in vivo developmental competence of reconstructed embryos was investigated. And, a total of 6,789 female fibroblast nuclear-transferred embryos were surgically transferred into 41 surrogate gilts and 4,746 male fibroblast nuclear-transferred embryos were surgically transferred into 25 surrogate gilts...
October 20, 2016: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/27732616/in-vitro-and-in-vivo-development-of-horse-cloned-embryos-generated-with-ipscs-mesenchymal-stromal-cells-and-fetal-or-adult-fibroblasts-as-nuclear-donors
#13
Ramiro Olivera, Lucia Natalia Moro, Roberto Jordan, Carlos Luzzani, Santiago Miriuka, Martin Radrizzani, F Xavier Donadeu, Gabriel Vichera
The demand for equine cloning as a tool to preserve high genetic value is growing worldwide; however, nuclear transfer efficiency is still very low. To address this issue, we first evaluated the effects of time from cell fusion to activation (<1h, n = 1261; 1-2h, n = 1773; 2-3h, n = 1647) on in vitro and in vivo development of equine embryos generated by cloning. Then, we evaluated the effects of using different nuclear donor cell types in two successive experiments: I) induced pluripotent stem cells (iPSCs) vs...
2016: PloS One
https://www.readbyqxmd.com/read/27678040/reproductive-outcomes-of-familial-oocyte-donation
#14
Joseph Hasson, Togas Tulandi, Weon-Yong Son, Na'ama Al Ma'mari, Ahmad Badeghiesh, Sammer Tannus, Janet Takefman, Tal Shavit
OBJECTIVE: Oocyte donation (OD) from a family member may be more available to patients. Our objective was to compare reproductive outcomes of familial OD with those of unrelated OD. DESIGN: Retrospective cohort study in a single university-affiliated center. SETTING: Not applicable. PATIENT(S): Four hundred thirty OD cycles performed from 2010 to 2014: 124 from family members and 306 from unrelated donors. INTERVENTION(S): None...
December 2016: Fertility and Sterility
https://www.readbyqxmd.com/read/27677907/mechanics-in-human-fibroblasts-and-progeria-lamin-a-mutation-e145k-results-in-stiffening-of-nuclei
#15
Ketaki Apte, Reimer Stick, Manfred Radmacher
The lamina is a filamentous meshwork beneath the inner nuclear membrane that confers mechanical stability to nuclei. The E145K mutation in lamin A causes Hutchinson-Gilford progeria syndrome (HGPS). It affects lamin filament assembly and induces profound changes in the nuclear architecture. Expression of wild-type and E145K lamin A in Xenopus oocytes followed by atomic force microscopy (AFM) probing of isolated oocyte nuclei has shown significant changes in the mechanical properties of the lamina. Nuclei of oocytes expressing E145K lamin A are stiffer than those expressing wild-type lamin A...
September 28, 2016: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/27672731/fresh-versus-cryopreserved-oocyte-donation
#16
Vitaly A Kushnir, Norbert Gleicher
PURPOSE OF REVIEW: Utilization of cryopreserved instead of fresh donor oocytes has rapidly increased in recent years. Whether treatment outcomes are comparable has, however, remained controversial. RECENT FINDINGS: More than 24% of initiated oocyte donation cycles in the USA during 2013-2014 involved previously cryopreserved oocytes. The use of cryopreserved-donated oocytes may simplify logistics and lower costs per treatment cycle. Whether cryopreserved donor oocytes also lower costs per live birth is still undetermined as they result in lower live birth rates in comparison to fresh donor oocyte cycles...
September 24, 2016: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/27664211/do-arts-affect-the-incidence-of-monozygotic-twinning
#17
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/27650944/oocytes-from-small-and-large-follicles-exhibit-similar-development-competence-following-goat-cloning-despite-their-differences-in-meiotic-and-cytoplasmic-maturation
#18
Min Yang, Justin Hall, Zhiqiang Fan, Misha Regouski, Qinggang Meng, Heloisa M Rutigliano, Rusty Stott, Kerry A Rood, Kip E Panter, Irina A Polejaeva
Reduced developmental competence after IVF has been reported using oocyte derived from small follicles in several species including cattle, sheep, and goats. No information is currently available about the effect of follicle size of the cytoplast donor on in vivo development after somatic cell nuclear transfer (SCNT) in goats. Oocytes collected from large (≥3 mm) and small follicles (<3 mm) were examined for maturation and in vivo developmental competence after SCNT. Significantly greater maturation rate was observed in oocytes derived from large follicles compared with that of small follicles (51...
August 10, 2016: Theriogenology
https://www.readbyqxmd.com/read/27634396/prepubertal-heifers-versus-cows-the-differences-in-the-follicular-environment
#19
E Warzych, P Pawlak, M Pszczola, A Cieslak, D Lechniak
The oocyte quality is to a large extent influenced by the sexual maturity of the donor female. Although this phenomenon has already been broadly described in domestic animals, the underlying mechanisms are poorly understood. Published data focus on oocyte ultrastructure, fertilization abnormalities, and blastocyst developmental rate. The goal of the present experiment was to characterize the follicular environment (oocyte, cumulus [CC] and granulosa (GC) cells as well as follicular fluid [FF]) in ovarian follicles of prepubertal heifers and cows...
August 12, 2016: Theriogenology
https://www.readbyqxmd.com/read/27622855/effect-of-long-term-exposure-of-donor-nuclei-to-the-oocyte-cytoplasm-on-production-of-cloned-mice-using-serial-nuclear-transfer
#20
Sayaka Wakayama, Yoshiaki Tanabe, Hiroaki Nagatomo, Eiji Mizutani, Satoshi Kishigami, Teruhiko Wakayama
Although animal cloning is becoming increasingly practicable, cloned embryos possess many abnormalities and so there has been a low success rate for producing live animals. This is most likely due to incomplete reprogramming of somatic cell nuclei before they start to develop as the donor nuclei are usually only exposed to the oocyte cytoplasm for 1-2 hours before reconstructed oocytes are activated to avoid oocyte aging. Therefore, in this study, we attempted to extend the exposure period of somatic cell nuclei to the oocyte cytoplasm to determine whether this could enhance reprogramming of donor nuclei...
November 2016: Cellular Reprogramming
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