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Tag: "embryos" at biology news

Fruit fly gene research may shed light on human disease processes

...is graduate students have been researching how fly embryos become male or female, a process that occurs over ...ilure to properly count X chromosomes is lethal to embryos of mammals and flies. That's why biologists want to understand the process of "chromosome counting....

The origin of the brain lies in a worm

...investigated how the developing CNS in Platynereis embryos gets subdivided into the regions that later on give rise to the different CNS structures. The regions are defined by the unique combination of regulatory genes expressed, which endow every type of neuron with a specific molecular fingerprint. Compari...

Old dinosaur research leads to new honor

...Robert Reisz discovering the oldest known dinosaur embryos and the oldest known reptile that stands on two le...t discovery ?finding 190-million-year-old dinosaur embryos in South Africa in 2005 ?is part of a time period that is about 100 million years younger than the o...

Penn researchers replace organ in adult mice using 'single-parent' stem cells

...According to McLaughlin, this is because mammalian embryos rely on a process called genomic imprinting, where cells will read certain genes from only one parent. Imprinting failures could lead to the death of an embryo and are frequently associated with some forms of cancer and other genetic disorders. ...

Procedure predicts embryos most likely to result in pregnancy

...ormed each year in the United States. In 2002, 3.1 embryos on average were transferred in IVF cycles, but onl...ften result from simultaneous transfer of multiple embryos with the hope that at least one will lead to a pregnancy." By comparing the content of the succes...

Scientists discover stage at which an embryonic cell is fated to become a stem cell

...genetic information in this protein in early mouse embryos can influence cell fate determination ...

Tumor-suppressor gene is critical for placenta development

...she crossed the two strains of mice, the resulting embryos had the DNA-destroying enzyme and the gene markers...moved the DNA between the two markers, leaving the embryos without a working Rb gene in the placental progenitor cells. These stem cells divided far too oft...

Scientists discover new, readily available source of stem cells

... from the amniotic fluid that surrounds developing embryos was published today in Nature Biotechnology. "Our hope is that these cells will provide a valuable resource for tissue repair and for engineered organs as well," said Anthony Atala, M.D., senior researcher and director of the Institute for Regenerat...

'Insulator' helps silence genes in dormant herpes virus

...en inserted copies of the structure into fruit fly embryos to see if they could block the activity driven by gene-activating elements called "enhancers" during development. "If the element we were testing was an insulator, then only one enhancer would be affected, and that's exactly what we found," Zhou ...

AAAS decries latest stem cell veto

...h proponents say would be derived from microscopic embryos left over and due to be discarded after in vitro fertility treatments. Current U.S. policy limits such funding to fewer than 20 stem cell lines that had been created when the president first announced U.S. policy in 2001. "Our concern is that this...

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