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Tag: "embryos" at biology news

Biologists develop genome-wide map of miRNA-mRNA interactions

...letely sequenced and a model organism to study how embryos develop. Using PicTar, an algorithm developed at NYU, the researchers predicted miRNA functions of C. elegans genes. The researchers found that one-third of C. elegans miRNAs target gene sets have related functions. That is, it appears that miRNAs ca...

UF scientists trace origin of shark's electric sense

...archers analyzed electroreceptordevelopment in the embryos of the lesser spotted catshark, an animal that is largely motionless during the day and hunts at night, mainly in the seagrass beds of the eastern Atlantic Ocean. Using molecular tests, scientists found two independent genetic markers of neural cres...

Mice with glowing hearts shed light on how hearts develop

...s insights into how hearts develop in living mouse embryos and could improve our understanding of irregular heartbeats, known as arrhythmias, as well as open doors to observing cellular processes to better understand basic physiology and disease. The technique for making living, functional cells fluoresce, ...

Genetically engineered mosquitoes show resistance to dengue fever virus

...y of mosquitoes descended from one of the original embryos that survived the procedure. They found that the vast majority of that family was highly resistant to dengue infection. They also were able to detect the engineered RNA in the mosquitoes, a sign that the genetic alteration had been successful and pas...

Vital ocean prey play active role in environment

...gs move offshore to deep water to spawn, where the embryos sink. The embryos hatch into free-swimming larvae at depth, then swim upward over the course of several weeks. The lar...

Study fishes out new role for prostaglandins

...ogical Sciences. Early in development, vertebrate embryos consist of one layer of cells. These simple embryos must go through a complex reorganization called gastrulation to establish the three primitive layers...

Wisconsin scientists grow two new stem cell lines in animal cell-free culture

...n animal cells - such as those obtained from mouse embryos in the case of embryonic stem cells - and other an...tem cell lines were derived from five blastocysts, embryos less than a week old and which were donated for research with the informed, written consent of patie...

One big biology question solved

...rivative of Vitamin A, causes germ cells in female embryos to begin meiosis, leading to the production of egg.... They also discovered an enzyme present in male embryos that wipes out retinoic acid and so suppresses meiosis until after birth, resulting in sperm product...

With few factors, adult cells take on character of embryonic stem cells

...ully induced differentiated cells taken from mouse embryos or adult mice to behave like embryonic stem cells....enes--all previously found to play a role in early embryos and embryonic stem cell identity--as candidate factors that might give body cells the ability to bec...

Nutrition a major factor in rise in twin pregnancies

...hat the rate of dizygotic (DZ) twinning ?where two embryos are involved and half the twins will be of differe... the community generally." "Because two implanted embryos have twice the chance of MZ twins than a single implanting embryo the best way of minimising MZ as w...

How IVF could be causing genetic errors in embryos

The conditions in which embryos are cultured in the laboratory during in vitro fer...ary work investigating genetic imprinting in mouse embryos had shown that certain culture media and concentrations of oxygen altered the expression of several ...

Study finds that a woman's chances of having twins can be modified by diet

...ation. Some studies also suggest that IGF may help embryos survive in the early stages of development. The co...g -- where the transfer and/or implantation of two embryos results in three infants -- and he proposed that adding more calcium or reducing the chelating agent...

New egg freezing technique offers hope to hundreds of women

...th 42.5% using fresh eggs), with an average of 2.3 embryos transferred each time (compared with an average of 1.1 embryos formed from fresh eggs). Eleven healthy babies were born (nine singletons and one pair of twins), wh...

Successful transplantation from pig embryos to mice

...as brought the possibility of transplants from pig embryos one step closer. The results of the study appeared... to reject them. By transplanting tissues from pig embryos into mice lacking proper immune systems, they determined that the best time frame for pancreatic tis...

With few factors, adult cells take on character of embryonic stem cells

...ully induced differentiated cells taken from mouse embryos or adult mice to behave like embryonic stem cells....enes--all previously found to play a role in early embryos and embryonic stem cell identity--as candidate factors that might give body cells the ability to bec...

Ten years later, Dolly is still making headlines

...ten years ago, will speak about his plans to clone embryos to alter disease genes in humans. Wilmut will be joined by two other leaders in biotechnology research, Dr. Kevin Eggan of the Harvard Stem Cell Institute, where plans were just announced to create the world's first cloned human embryonic stem cells,...

Making a face: A new and earlier marker of neural crest development

...s -- that formation of neural crest cells in chick embryos is independent of both mesoderm and neural tissues...h disruption of neural crest development. Chick embryos have well-characterized stages and are a valuable model for examining vertebrate development. While ...

Study shows frogs can play key role in stem cell research

...yos, to inactivate the native PouV proteins. These embryos continued to grow, but had defective heads and tails. When the scientists looked closely at these embryos, they found that cells had become specialised before they were supposed to ?before the embryo was ready for them. Consequently, the structures...

Sperm created in the laboratory from embryonic stem cells produce viable progeny

...essful fertilization and the resulting early stage embryos were successfully transplanted into mice. Six of t...tilize eggs and support full-term development into embryos and adult mice. "Our approach provides an accessible in vitro model system for studies of mammalian ...

New technology addresses female fertility preservation

...h can be fertilized and ultimately lead to healthy embryos and the birth of live mice. Previously developed methods of growing follicles or eggs outside of the body do not provide the three-dimensional support to maintain the follicle structure in which the egg must grow. "While the research is in its early...

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