An
"oocyte" is a scientific term used to describe an egg cell in females. It is the cell that can be fertilized by a sperm cell to start the development of a new life.
Full definition
It also should relieve the worries of the scholars involved with the journal Communio ¯ the use
of oocytes in epigenetic reprogramming was one of the major reasons they feared the resulting cell was a disabled embryo.
But few labs had a source of
human oocytes with which to attempt the experiment.
To find out more about the pathway's role in
oocyte maturation, Nick Duesbery, a postdoc in Vande Woude's lab, was seeking compounds that block MAPK's activity.
Jennifer F. Kawwass, M.D., of the Emory University School of Medicine, Atlanta, and colleagues examined trends in use of
donor oocytes in the United States and assessed perinatal outcomes.
Dolly was the only lamb born from 277 fusions of
oocytes with udder cells.
Effects of Myo - inositol Supplementation on
Oocytes Quality in PCOS Patients: A Double - blind Trial.
We hypothesized that the MfR subunits, methoprene - tolerant transcription factor (Met) and steroid receptor coactivator (SRC), would be expressed coincident with the timing of sex programming of developing
oocytes by methyl farnesoate in daphnids.
Like Medieval alchemists who searched for an elixir that could turn base metals into gold, biology's modern alchemists have learned how to
use oocytes to turn normal skin cells into valuable stem cells, and even whole animals.
«The leap of faith is finding the viable sperm or oocytes [cells that become eggs],» says John Critser, scientific director of the Cryobiology Research Institute in Indianapolis.
The authors write that the reasons for lower live birth rates with use of
cryopreserved oocytes remain to be established.
[9] Prasad, S., Tiwari, M., Pandey, A.N., Shrivastav, T.G., & Chaube, S.K. «Impact of stress
on oocyte quality and reproductive outcome.»
In a development that could alter the ethical landscape surrounding human embryonic stem (ES) cells, scientists have found that mouse ES cells can develop
into oocytes in culture dishes.
Wakayama, T., Perry, A. C. F., Zuccotti, M., Johnson, K. R., and Yanagimachi, R. Full - Term Development of Mice from
Enucleated Oocytes Injected with Cumulus Cell Nuclei.
Using a powerful microscope to observe mouse
oocytes as they split, Ellenberg's group found that the spindles assembled into two coherent structures, one for the future egg and one for the future polar body.At first, spindles appeared throughout the cell in a sort of mesh.
He was also instrumental in developing techniques for post thaw extended culture (PTEC) following fertilized
oocyte cryopreservation demonstrating the importance of embryo - endometrial synchrony for implantation, for which he received another research award.
First, they extract immature, unfertilised egg cells
called oocytes from the ovaries of ewes.
In the ovary of a normal mouse (left), a large follicle is shown at a late stage of development (a light pink
oocyte surrounded by follicular cells, inset).
Another unique feature is that the bitch ovulates ova in the primary
oocyte stage.
The study
Mammalian oocytes locally remodel follicular architecture to provide the foundation for germ line - soma communication was co-authored by Stephany El - Hayek, Qin Yang, Laleh Abbassi, Greg FitzHarris, and Hugh J. Clarke.
Neuroticism was positively associated with trait anxiety
at oocyte collection (Cooper et al., 2000), state anxiety following IVF treatment failure (Verhaak et al., 2004, 2005a, b) and depression after IVF treatment success and failure Verhaak et al. (2005a, b; Volgsten et al., 2010).
Reproductive potential of mature
oocytes after conventional ovarian hyperstimulation for in vitro fertilization
A successfully implanted
oocyte developed into the lamb Dolly, a clone of the nuclear donor, the Finn - Dorset ewe.
Research activites of the faculty focus on equine
oocyte activation and immunocontraception.
Myo - inositol rather than D - chiro - inositol is able to
improve oocyte quality in intracytoplasmic sperm injection cycles.
These authors also identified a significant partner effect, namely that a man's depression score at
oocyte collection predicted their partner's stress appraisals after the embryo transfer and pregnancy test.
Freezing oocytes (immature eggs) is already an established, if not totally reliable, practice at some IVF clinics.
To establish the living mouse colony, an aliquot of the frozen sperm was used to
fertilize oocytes from C57BL / 6J inbred mice (Stock No. 000664).
For policy makers, revising the National Assisted Reproductive Technology Surveillance System to allow reporting of outcomes on a per - couple basis (
including oocyte donors) would provide significantly more useful information for decision - making purposes.»
Figure 1: Confocal (upper half) and super-resolution (STED, lower half) micrograph of localising oskar mRNPs in close proximity to the posterior pole of a developing
Drosophila oocyte.
Areas of Research and Publication - Assisted reproductive technologies and
oocyte donation in women of advanced reproductive age.
With more women delaying childbirth until their thirties or even later, understanding
how oocytes age is crucial to helping women have healthy babies.
Donated
fresh oocytes traditionally have been used immediately, creating embryos for transfer into the uterus, with extra embryos being cryopreserved for later use.
In biology, folliculogenesis refers to the maturation of the ovarian follicle, a densely - packed shell of somatic cells that contains an
immature oocyte.
The term «
oocyte assisted reprogramming» suggests that the egg cell will merely assist in reprogramming.
These results open new opportunities for developing a therapy for
preserving oocytes of female cancer patients treated with chemotherapeutics.