Drugs needed to preserve eggs for reproduction need to be given in stages
AUGUSTA, Ga. Cryoprotectants needed to preserve eggs for reproduction
need to be given in stages, albeit rapid ones, say scientists who have developed a mathematical model that predicts optimal time for loading and unloading these drugs.
Their studies in Rhesus monkey eggs, which are very simi...
Attitudes towards assisted reproduction and preimplantation genetic diagnosis
Madrid, December 15, 2008.- According to an international survey by the BBVA Foundation conducted this year, citizens in advanced societies view assisted reproduction
techniques in general and in vitro fertilization in particular as firmly acceptable alternatives for people with fertility problems...
October 2008 Biology of Reproduction highlights
The role of the Dicer. MicroRNAs are emerging as major transcriptional and post-transcriptional regulators of gene expression. DICER, an RNaseIII enzyme, plays a role in the biogenesis of microRNAs; recently there has been a flurry of activity to determine the developmental role of DICER by whol...
September 2008 Biology of Reproduction highlights
Proteomes to unravel gonadotrophs
Although the basic developmental lineage of pituitary gonadotrophs is known, it has been harder to associate specific changes in gene expression with maturation due to the limited cell population. In an article on p. 546 of the September 2008 issue of Biol...
Acidification of the sea hampers reproduction of marine species
By absorbing carbon dioxide from the atmosphere, and from the human use of fossil fuels, the world's seas function as a giant buffer for the Earth's life support system. The chemical balance of the sea has long been regarded as immovable. Today, researchers know that the pH of the sea's surface wa...
Failure of the 1st attempt at assisted reproduction justifies at least 1 additional cycle
This release is also available in Spanish .
Barcelona, Spain: Research into the effect of age and the number of times women undergo assisted reproduction
technology (ART) shows that for younger women, the overwhelming majority achieve a pregnancy within the first two attempts, whereas wom...
Biology of Reproduction highlights
Mother has the final say.
For young male offspring who suffer a dominant mother, a brother may be on the way to help bear the burden. And all because of follicular testosterone. A growing body of evidence suggests a maternal influence on sex determination: dominant human females conceive more...
Yeast missing sex genes undergo unexpected sexual reproduction
DURHAM, N.C. An emerging form of the pathogenic yeast Candida is able to complete a full sexual cycle in a test tube, even though it's missing the genes for reproduction. And it may also do so while infecting us, according to Duke University Medical Center researchers.
"Sex contributes to t...
February 2009 highlights from Biology of Reproduction
Bliss* blocks sperm. Evidence suggests that human male fertility is impacted by long-term exposure to marijuana. Indeed, endocannabinoids and their receptors are present in the male reproductive tract, further suggesting a functional role in fertility, but there has been no genetic test to clari...
Low level herbicide use can damage potato reproduction
MADISON, WI, JANUARY 5, 2009 Currently, plant testing in the United States to determine potential ecological risks from chemical pesticides to nontarget plants requires two tests, both of which use immature plants. Protection of the plant development and reproduction
are not considered, unlike te...
December 2008 highlights from Biology of Reproduction
SO-What? At the time of birth, mouse ovaries are essentially a bag full of primordial oocytes, around which primordial follicles are forming. This key time in ovarian development establishes the population of oocytes and follicles and instigates evelopment of a cohort of follicles. If follicles...
New master switch found in the brain that regulates appetite and reproduction
LA JOLLA, CA Body weight and fertility have long known to be related to each other women who are too thin, for example, can have trouble becoming pregnant. Now, a master switch has been found in the brain of mice that controls both, and researchers at the Salk Institute for Biological Studies sa...
Ancient mother spawns new insight on reptile reproduction
A 75-million-year-old fossil of a pregnant turtle and a nest of fossilized eggs that were discovered in the badlands of southeastern Alberta by scientists and staff from the University of Calgary and the Royal Tyrrell
Museum of Palaeontology are yielding new ideas on the evolution of egg-laying an...
New evidence for female control in reproduction
WASHINGTON, D.C. Adding another layer of competition to the mating game, scientists are reporting possible biochemical proof that the reproductive system of female mammals can sense the presence of sperm and react to it by changing the uterine environment. This may be the molecular mechanism behi...
Salmonid hatcheries cause 'stunning' loss of reproduction
CORVALLIS, Ore. The rearing of steelhead trout in hatcheries causes a dramatic and unexpectedly fast drop in their ability to reproduce in the wild, a new Oregon State University study shows, and raises serious questions about the wisdom of historic hatchery practices.
The research, to be publ...
Low oxygen in coastal waters impairs fish reproduction
PORT ARANSAS, TexasLow oxygen levels in coastal waters interfere with fish reproduction
by disrupting the fishes hormones, a marine scientist from The University of Texas at Austin Marine Science Institute has found.
Incidents of seasonal low levels of oxygen, known as hypoxia, have increased d...
Tissue engineered scaffolding allows reproduction of cartilage tissue
A new study examines the use of tissue-engineered scaffolding made of cartilage cells, which have a limited ability to heal naturally, to replace defective cartilage tissue. Cartilage cells are extracted and seeded to the scaffold which is implanted into the body, where new cartilage tissue is grow...
Sexual reproduction delays aging in a mammalian species
Past research on aging and the life histories of diverse species has shown that sexual reproduction
is biologically costly for individuals and tends to decrease lifespan rather than increase it. But a new study by Philip Dammann and Hynek Burda from the University of Duisburg-Essen shows that, in a...
Sex in the Caribbean: Environmental change drives evolutionary change -- eventually
...nian Tropical Research Institute and Scripps Institution of Oceanography. The fossil record shows that if a species could shift from clonal to sexual reproduction
it survived. Otherwise it was destined for extinction, millions of years later.
Closure of the Isthmus of Panama involved a protracted sequence of v...
Stress signals link pre-existing sickness with susceptibility to bacterial infection
...ria will result in a better power supply. Researchers now show that the stress-signal associated with mitochondrial disease facilitates the growth and reproduction
of the lung-infecting bacteria, Legionella .
Cells with mitochondrial disease increase their production of a signaling protein called AMP-activat...
Parasitic worms make sex worthwhile
...tageous for the snail, whose females favor asexual reproduction
in the absence of parasites, say Indiana Universit...ed Queen Hypothesis" of sex, which suggests sexual reproduction
allows host species to avoid infection by their co...lutionary biologists have long wondered why clonal reproduction
does not replace sexual...
Preimplantation genetic diagnosis may pose neurological risks
...ysis of PGD in mice suggests that this procedure may increase risks of weight gain and memory decline in adulthood.
PGD is used alongside assisted reproduction
technologies to ensure couples that may be carriers of genetic disease (e.g. Ashkenazi Jews who have a high incidence of Tay-Sachs among their populat...
Reintroduced Chinese alligators now multiplying in the wild in China
...rs. The first three animals released in Hongxing Reserve of Xuancheng County in Anhui in 2003 were from the Anhui Research Center of Chinese Alligator reproduction
To ensure the maximum genetic diversity for the effort, project participants imported 12 more animals to Changxing Yinjiabian Chinese All...
Sex involved in plant defense
...of the research paper.
"The variation in sexual reproduction
has a large impact on the ability of plants to evo...s. Though there are short-term benefits to asexual reproduction
populations can grow more rapidly and propagate e...a long-term disadvantage.
"In the end, asexual reproduction
appears to be an evolutionary dead-end."
Playing it safe
...s), from the testis of adult mice. In their natural environment, these cells can only do one thing: constantly generate new sperm. Moreover, their own reproduction
is an extremely rare occurrence. Only two or three of them will be found among the 10,000 cells in the testis tissue of a mouse. However, they can be ...
Study finds role for parasites in evolution of sex
...lineages was surprisingly fast and consistent with the prediction of the parasite hypothesis for sex," Jokela said. "These results suggest that sexual reproduction
provides an evolutionary advantage in parasite rich environments."
So we may well have to thank parasitesin spite of their nasty reputationfor the ...
Chromosomal problems affect nearly all human embryos
...e for Human Genetics and the University Fertility Center, Leuven University, Belgium, told the 25th annual conference of the European Society of Human reproduction
and Embryology today (Wednesday July 1), that the surprising finding meant that current techniques used in preimplantation genetic screening (PGS), wh...
Will IVF work for a particular patient? The answer may be found in her blood
... IVF treatment in blood. Dr. Cathy Allen, from the Rotunda Hospital, Dublin, Ireland, told the 25th annual conference of the European Society of Human reproduction
and Embryology today (Wednesday 1 July) that her research would help understand why IVF works for some patients but not for others.
Previous work i...
Women with endometriosis need special care during pregnancy to avoid risk of premature birth
...annual conference of the European Society of Human reproduction
and Embryology heard today (Wednesday July 1). Dr....esearch is published on-line in the journal Human reproduction
The researchers investigated the assoc...iation between adverse pregnancy outcome, assisted reproduction
technology (ART), and a previous diagnosis of endo...
New test can detect both genetic and chromosomal abnormalities in embryos
... from spare embryos that were known to have cystic fibrosis.
They told a news briefing at the 25th annual meeting of the European Society of Human reproduction
and Embryology in Amsterdam today (Tuesday) that, as a result, they would be able to offer clinical trials to couples seeking fertility treatment late...
Single thawed embryo transfer after PGD does not affect pregnancy rates
... consequent complications associated with these pregnancies.
The research was presented at the 25th annual meeting of the European Society of Human reproduction
and Embryology in Amsterdam and published online in Europe's leading reproductive medicine journal, Human Reproduction, simultaneously today (Tuesday)...
Ovarian transplantation: First baby is born after a new technique
...ies of women who have lost their fertility as a result of cancer treatment was outlined to the 25th annual conference of the European Society of Human reproduction
and Embryology today (Monday 29 June). Dr. Pascal Piver, manager of the IVF Centre at Limoges University Hospital, Limoges, France, described a new,...
Ovarian transplantation: New technique gives greatly improved results in this delicate operation
...it being used in transplants with the same success rate as fresh tissue, a researcher told the 25th annual conference of the European Society of Human reproduction
and Embryology today (Monday 29 June). Dr. Sherman Silber, Director of the St. Louis Infertility Centre, St. Louis, Missouri, USA, said that freezing ...
New, less invasive genetic test greatly improves pregnancy rates in older women with poor prognosis
...ilisation can identify those that are capable of forming a healthy baby, a researcher told the 25th annual conference of the European Society of Human reproduction
and Embryology today (Monday 29 June). Dr. Elpida Fragouli, from the Department of Obstetrics and Gynaecology, University of Oxford, UK, and Reprogene...
ICSI or IVF: Babies born from frozen embryos do just as well
...ICSI in 1992, told the 25th annual meeting of the European Society of Human reproduction
and Embryology in Amsterdam today (Monday) that she and her colleagues had ...os as part of fertility treatment has become a fundamental part of assisted reproduction
technology. We found no differences in the ability of embryo generated by I...
Who goes abroad for fertility treatment and why?
...ect launched at the 25th annual conference of the European Society of Human reproduction
and Embryology today (Monday June 29). Study co-ordinator Dr. Franoise Sh...ish women were single.
The majority of respondents were seeking assisted reproduction
treatment (ART) only (73%) as opposed to 22.2% intrauterine insemination (I...
Female human embryos adjust the balance of X chromosomes before implantation
...place in human female embryos prior to implantation in the womb.
Ms Ilse van den Berg told the 25th annual meeting of the European Society of Human reproduction
and Embryology in Amsterdam today (Monday) that her findings may have implications for the laboratory cultures that embryos are grown in before transf...
Complications early in pregnancy or in previous pregnancies adversely affect existing or subsequent pregnancies
...1000 (2006 figures) the second highest rate in Europe .
Dr Robbert van Oppenraaij told the 25th annual meeting of the European Society of Human reproduction
Embryology in Amsterdam today (Monday) that he and his colleagues from the UK, Denmark and Spain had
reviewed 75 studies carried out between 1980-...
ESHRE launches international study of polar body screening
... Amsterdam, The Netherlands: The efficacy of preimplantation genetic screening (PGS) has been one
of the most hotly disputed subjects in assisted reproduction
over the past few years. None of the trials
carried out so far has shown conclusively whether it works or not. Now the European Society of Human
Environmental cues control reproductive timing and longevity, University of Minnesota study shows
... When humans and animals delay reproduction
because food or other resources are scarce, they m...predict population declines, causing them to delay reproduction
until the decline has occurred, when each offsprin... between current and future reproduction, delaying reproduction
can be a good idea, even if it reduces the number ...