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Tag: "embryo" at biology news

Scientists unpick genetics of first 15 minutes of life

...lains why eggs fail to produce a zygote - or early embryo - despite the presence of 'healthy' sperm. Although the researchers use the fruit fly Drosophila melanogaster to discover the basic genetic processes of sex, the same genetic processes are present in all sexually reproducing animals, including human...

Researchers discover key to human embryonic stem-cell potential

...d can now see how this is accomplished." Once an embryo is a few days old, the stem cells start to differe...they also repress a key set of genes needed for an embryo to develop. This key set of repressed genes produce additional transcription factors that are resp...

Newly recognized gene mutation may reduce seeds, resurrect plants

...n genetic connection between lipid development and embryo development in plants, said Matthew Jenks, lead au...role in crop seed self-thinning mechanisms through embryo abortion. Unlike some other mutants that abort all of its seeds, the mutant RST1 plant aborts only ...

UT Southwestern researchers discover master switch in cell death

...when it removes the webbing from the fingers of an embryo or shapes a developing brain. But the darker side of this complex process manifests itself in cancers when cells don’t die when they’re supposed to. The key to the researchers?finding was the interaction between the Mule enzyme and a major player in...

Discarded placentas deliver researchers promising cells similar to embryonic stem cells

...mmented Dr. Strom. The amnion is derived from the embryo and forms as early as eight days after fertilization, when the fate of cells has yet to be determined, and serves to protect the developing fetus. According to the researchers' studies using placentas from full-term pregnancies, amniotic epithelial c...

Most embryos produced during IVF do not result in live births

...ation genetic diagnosis and biochemical markers of embryo viability," said Patrizio. "In addition this study should also move the field toward perfecting methods of egg production." ...

Israeli scientists successfully transplant frozen-thawed ovaries in sheep

...erm. This way, we knew that the development of the embryo depended solely on the quality of the ooctye," said Dr Arav. Two years after transplantation the researchers carried out magnetic resonance imaging (MRI) on one sheep with a transplanted ovary and one untreated control sheep. It showed that the tran...

NYU biologists map out early stages of embryo formation

...eliminary molecular diagram of the early stages of embryo formation, offering for the first time a global lo... systems--in this case, an engineering diagram for embryo formation. Using a new way to combine results from different functional genomic approaches including...

Orientation and the egg

...ment of first polarity in the developing mammalian embryo is one of the most contentious topics in developmental biology today. Drs. Davor Solter and Takashi Hiiragi have new evidence to fuel the ongoing debate. Using various techniques, including comprehensive time-lapse microscopy, the researchers showed ...

Human embryonic stem cells have the potential to develop into eggs and sperm in the laboratory

...ametes produced in this way and therefore a unique embryo would form. "In addition, if we could produce eggs from HESCs they could also be used for therapeutic cloning (somatic nuclear replacement) circumventing the need for eggs from patients who donate them, as this is a major limitation of this techniqu...

New Look at DNA Hints at Origin of UV Damage

...ecause it takes only three days to develop from an embryo to an adult capable of reproducing. Also, scientists can easily manipulate specific genes in the worm, and in contrast to other animal models, large quantities of the worms can be grown quickly and can even be frozen and used later. "C elegans lives...

Wild grasses and man-made wheats advance research capabilities

...d wheat and then rescue and nurture the developing embryo to get a plant, he said. Hexaploid wheat has three genomes or sets of chromosomes. This is the makeup of the typical bread wheat. After such a cross, the initial plant will have genetic abnormalities. A series of crosses back to the hexaploid wheat ...

Novel plague virulence factor identified

...ecause it takes only three days to develop from an embryo to an adult capable of reproducing. Also, scientists can easily manipulate specific genes in the worm, and in contrast to other animal models, large quantities of the worms can be grown quickly and can even be frozen and used later. "C elegans lives...

Scientists find microRNAs regulate plant development

...ur study. This result implies that the Arabidopsis embryo relies on microRNA restriction of ARF17 activity to achieve normal bilateral symmetry." A second report focuses on the function of the protein ARGONAUTE1 (AGO1), a major component of the RNA-induced silencing complex in Arabidopsis. There are many A...

Invitrogen Launches i-Path -- A Unique Systems Biology Platform at BIO 2005

...inued to divide to the six- to ten-cell stage. One embryo continued to develop to the compacted stage, when the individual cells started to flatten and increase their contact with one another. Mr Heindryckx said: "To our knowledge, this is the first report describing the development of cloned human embryos...

Scientists succeed in cloning human embryos from eggs matured in the lab

...inued to divide to the six- to ten-cell stage. One embryo continued to develop to the compacted stage, when the individual cells started to flatten and increase their contact with one another. Mr Heindryckx said: "To our knowledge, this is the first report describing the development of cloned human embryos...

Scripps research scientists identify infertility molecule

...." If the receptors do turn out to be relevant to embryo implantation in humans, then the mechanisms involv.... Finally, the fertilized egg must become a viable embryo and implant in the uterus. Problems can occur in any one of these steps along the way and cause inf...

Researchers discover mechanism for multiplying adult stem cells

...an organism. Oct4's primary function is to keep an embryo in an immature state. It acts as a gatekeeper, preventing the cells in the embryo from differentiating into tissue-specific cells. While Oct4 is operating, all the cells in the embry...

Study: Well-known protein helps stem cells become secretory cells

...ession of 34 secretory genes in a normal fruit fly embryo to see which genes were turned on when. All 34 genes were expressed at high levels in the early salivary gland, they found. According to Andrew, "This suggests the salivary gland becomes programmed for secretion because all the components required to...

Vitamin A's paradoxical role in influencing symmetry during embryonic development revealed

... embryonic stem cells enter the node region of the embryo and begin forming the embryo's three main layers o... by studying the behavior of stem cells within the embryo will we be able to understand how these cells are instructed to give rise to specific cell types tha...

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