Is there a risk of transmitting genetic disorders to babies conceived by fertility procedures?
...rics warns that, even after thorough screenings of sperm donors, genetic disorders can be transmitted to th...g leukemia. The study results showed that the same sperm donor was used for all five pregnancies. After conducting advanced genetic testing, the authors est...Ecologists home in on how sperm whales find their prey
Ecologists have at last got a view of sperm whales' behaviour during their long, deep dives, t...sh Ecological Society's Journal of Animal Ecology, sperm whales like bats use echolocation consistently to track down their prey at depth. Working in the...Algae's protein 'tails' create motion and aid munching
...ENCE, R.I. -- When single-celled organisms such as sperm crack their whip-like appendages called flagella, the beating sets them in motion. But in certain colonies of green algae, flagella also boost nutrient uptake, according to surprising new research. In the early online edition of the Proceedings of th...Study shows that genetic quality of sperm deteriorates as men age
New research indicates that the genetic quality of sperm worsens as men get older, increasing a man's risk ...f California, Berkeley, found a steady increase in sperm DNA fragmentation with increasing age of the study participants, along with increases in a gene muta...Origen publishes in Nature a robust and versatile method for creating transgenic chickens
...n to primordial germ cells, the precursor cells to sperm and eggs," said Marie-Cecile van de Lavoir, senior...cells known as primordial germ cells (PGCs) become sperm or eggs in the adult animal. Previous attempts to culture PGCs from mice and humans produced embryon...New egg freezing technique offers hope to hundreds of women
... men have been able to use their previously frozen sperm for IVF treatment but women have not been able to ...ashige Kuwayama told a news briefing that although sperm could be frozen, thawed and used for in vitro fertilisation with high levels of success, the freeze-...Study links high levels of nitric oxide to infertility and sperm DNA damage
...lays an essential role in many bodily functions to sperm DNA damage and male infertility, the 22nd annual c...ctive system, and we know that it can affect human sperm functions, such as motility, viability and metabolism. At low concentrations it can have a positive ...New method of testing eggs for abnormalities could solve problems of embryo freezing
... normal eggs were inseminated by intra-cytoplasmic sperm injection (ICSI) before being cultured and transferred to the women. In the other 244 cases, the researchers used the conventional criteria of choosing eggs that appeared, on close external inspection, to be normal, before insemination by ICSI. There...ICSI children are developing well at the age of eight
...dies of children conceived using intra-cytoplasmic sperm injection (ICSI), the study showed a slightly higher rate of major congenital malformations. She suggested this could be related to the genetic background of the parents rather than to the ICSI technique. Dr Belva, a paediatrician and research assis...Slow-frozen people? Latest research supports possibility of cryopreservation
...Only certain kinds of cells and tissues, including sperm and embryos, currently can be frozen and successfully rewarmed. A major problem hindering wider use of cryopreservation is formation of ice crystals, which damage cell structures. cryopreservation may be most familiar, however, as the controversial i...Chromosomal abnormalities in sperm higher after vasectomy reversal
...greater rate of chromosomal abnormalities in their sperm than do normal fertile men, a scientist told the 2...en with obstructive azoospermia, a condition where sperm are created but cannot be mixed with the ejaculatory fluid due to a physical obstruction (such as a ...New research reveals unexpected post-mating gene expression in model lab insect
...dence that after fruit flies mate, the presence of sperm and male proteins in the female's reproductive tra...ila and studies of mating insects, showed that the sperm and proteins transferred from males to females during mating have "profound effects" on female gene ...World-first stem cell research could aid male infertility
Scientists have shown for the first time that sperm grown from embryonic stem cells can be used to pro...hey developed a new strategy for generating mature sperm cells in the laboratory using embryonic stem cells from mice. They then went on to test whether this...Sperm created in the laboratory from embryonic stem cells produce viable progeny
... (ES) cells cultured in the laboratory can produce sperm with the capacity to produce viable offspring. The... including investigation of mechanisms involved in sperm production and development of new treatment strategies for infertility. Previous studies have show...Early fetal gender test demands rapid ethical policymaking
...d of achieving this goal. Now that methods, like sperm selection and non-invasive methods of testing an e...the cost and effort involved, the unreliability of sperm sorting or the need for termination of pregnancy following prenatal diagnosis," says Hall. "People a...Gene breakthrough heralds better prospect for malaria solution
...uit fly and mosquito, they do this by altering the sperm of infected males to prevent them from successfull...is that the changes it makes in the development of sperm are so subtle that they can be difficult to trace." In their research the scientists compared the ...MEN may contribute more than just sperm to the babymaking process their semen may coax th...carrier agent for sperm. It is thought to increase sperm motility and strength but not actually affect the woman's body. Indeed, IVF clinics rinse the semen ......ion in other biological processes, such as after a sperm enters an egg and how flu viruses enter cells. Zimmerberg is testing the stalk hypothesis on sea urchin eggs and the nerve cells of the Woods Hole squid....Study finds how organs monitor themselves during early development
...ses. Germ cells are cells that give rise to either sperm or egg and can ultimately give rise to a new organ...ment, she says. In every organism, both egg and sperm cells cannot develop unless they are embedded in a matrix of somatic cells, says Dr. Lehmann. Inter...Genetic surprise confirms neglected 70-year-old evolutionary hypothesis
...ha, is one of the same genes that is essential for sperm motility in the flies, as well as in humans and other mammals. Masly's work shows a back door through which speciation can start. If the right genes jump around in the genome, a population can begin creating individuals that can't successfully mate w...