Tag: "embryo" at biology news

USGS finds elevated levels of organochlorine pesticides in Aleutian bald eagles

...tive success because of eggshell thinning and embryo death, was associated with many of these declines. Since DDT was banned in the United States, populations of bald eagles, peregrine falcons and ospreys have increased. The researchers are continuing their studies into the so...

Researchers say hormones are key to evolution of insect metamorphosis

...tial or no metamorphosis, the absence of JH during embryo formation anddevelopment allows the embryo to become a miniature version of the adult. Inembryos of insects with complete metamorphosis, Truman...

New mouse model could be key to understanding role of folic acid in preventing birth defects

...olved for 18 years.Having a tool to dissect how an embryo gets folic acid is going to be useful toanswering many clinical questions. There are practical applications to ourfindings. It is also gratifying when the collaborative efforts of an outstandingresearch team all comes together like it did in this stu...

A safer way of altering genes

...ks, every cell in theanimal that develops from the embryo will contain the added genes, including itssperm and eggs. This means that the genes will be inherited by the transgenicanimals' offspring. It's a haphazard process, however. Often the gene doesn't getincorporated into the embryo's genome. And...

Errant nerve cells risk a clockwork death

...tudy commissural axons,which in the developing rat embryo extend themselves from one side of the spinalcord to the other. Under normal conditions, commissural axons sprouting from one side of thespinal cord migrate toward a guiding structure at the base of the developingspinal cord known as the floor plat...

Woman pregnant after selecting healthy embryo

...nces University patient to become pregnant with an embryo that was selected because it showed no signs of genetic abnormalities. The procedure is called preimplantation genetic diagnosis (PGD) and involves the testing of embryos for signs of abnormalities before the embryos are transferred to a womans uteru...

Key developmental genes identified, linked to rare syndrome

...ew, embryonic pattern. As cells in the developing embryo reproduce, newly synthesized DNA continually is re...ion patterns are critical to the development of an embryo and in the regulation of a number of biological processes. Scientists believe that this same sort o...

Crack open an egg and cure a disease

...the egg white. "We put it in a one-day-old chicken embryo by microinjecting it into a cavity called the blastoderm," explains Sensoli. He and his colleagues hope that some virus reaches primordial cells in the blastoderm which develop into sperm and eggs, so the gene for the protein can be passed down to fu...

Zebrafish's powerful heart gene could lead to transplant therapy

...sed toredirect the fate of cells in the developing embryo to become beating heartcells, suggesting that a si...n of the heart. Expression of gata5 throughoutthe embryo caused heart cells to form and beat -- spontaneously andrhythmically -- as far away from the head re...

Human stem cell research leads Science's top ten list of the best scientific advances in 1999

...ve damage. But, for many, using cells from a human embryo to do so is a troubling prospect. Although the debate is sure to continue, new federal rules suggest that the climate for embryonic stem cell research may be beginning to thaw. And there are few ethical concerns regarding stem cells from adults, whi...

Mouse embryo hints at how mammalian body forms

Researchers have made a finding in the mouse embryo that they say provides a fundamental insight into ...igin in the so-called blastocyst stage -- when the embryo is a free-floating, hollow ball of cells -- through to its progression into the later embryo, implan...

UCSF researcher reports on protein therapy to reverse facial birth defects

...niofacial deformities, and that dosing the chicken embryo with a regulatory protein can restore a near normal face. The results suggest that, someday, carefully timed protein treatments in human fetuses might repair cleft palate and milder forms of some birth defects. The research was presented here toda...

Scientists clarify much-sought enzyme, pave road to cancer therapy

...lls shut down production of telomeraseearly on, in embryo development. In cancer cells, however, the enzymecontinues to be widely active, says Greider. The exact reason for telomerase's continued activity in cancer cells isn'tclear, says Greider. Some have speculated, she says, that whatever sparkscancer'...

Researchers discover retinal stem cells in adult mammals

...ously dividing and self-renewing, beginning in the embryo and continuing throughout post-natal life and into adulthood. When this cell division occurs, one of the two new cells is identical to the original while the other is slightly different. These new cells continue to divide and can become specialized a...

Gene tracking follows cells from embryo to adult

...l crest, named for their site of origin. When the embryo is little more than an elongated blob, a thickened...st cells leave the presumptive brain region of the embryo and migrate to distal sites of the emerging body. However, the labeling techniques have been rather...

White House honors Hutchinson Center Scientist with Presidential Early Career Award

...h focuses on the hindbrain, which in the zebrafish embryo resembles a segmented worm. She wants to know how those segments form and how the cells they contain become grouped according to function, from controlling motor activity to patterning the development of the head. But what does hindbrain development ...

Gene defects tied to inability of cells to repair DNA damage

...have been diagnosed worldwide.) "If the developing embryo is unable to repair endogenous types of DNA damage, normal damage that cells are always exposed to, the likelihood of going to full term is reduced," Leadon explained. "I think one of the goals of a number of labs including ours is to figure out why ...

New fertility technique to help women have own genetic baby from donor egg

...elop treatment for women with repeated failures of embryo development caused by defective cytoplasm in their eggs. Compared to standard egg donation this approach will enable a nearly full genetic contribution (with the exception of 37 female extranuclear genes) from both parents to the future embryo. T...

Northwestern scientists shed new light on neurodegenerative diseases

...ehavior, moving with normal speed and growing from embryo to adulthood in the expected time of 48 hours. On the other hand, the worms with 82 residues were extremely sluggish, and their growth was slowed. It took them more than twice as long to reach adulthood. Under a microscope, the researchers could see ...

Adult stem cells can produce a wealth of cell types, Science authors report

...iety of tissue types by growing them together with embryo cell cultures in the lab and injecting them into early-stage chick and mouse embryos. In the lab cultures, the offspring of the stem cells switched their identities to become muscle cells. Depending on which early cell layer they managed to infiltra...

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