Discovery: Stem Cells Are produced from Endangered Species by Researchers
Stemagen via Bloomberg News
Scientists have managed to produce stemcells from endangered species for the first time, a breakthrough that could save endangered species and could even revive extinct ones.
Oliver Ryder, director of genetics at the San Diego Zoo and co-author of the study,said that stemcell technology provides hope to tackle the problem of extinction of species as efforts to preserve species and habitats do not always work.
George Daley, a professor at Children’s Hospital Boston and Harvard Medical School, said that the technology would allow scientists to capture a genome in a way that is reproducible and will also allow them to study tissue development long after the animal is gone.
However, Prof. Daley added, “Whether or not this can assist in reproduction is somewhat more speculative, and that may or may not ever pan out.”
Conservationists in San Diego started freezing skin samples from endangered species in 1972, in a hope that scientists would some day be able to use the cells to save species that are in danger of extinction.
Stem cells are how we all begin: undifferentiated cells that go on to develop into any of the more than 200 types of cell the adult human body holds.
Few quarrel with predictions of the awesome potential that stem cell research holds. One day, scientists say, stem cells may be used to replace or repair damaged cells, and have the potential to drastically change the treatment of conditions like cancer, Alzheimer's and Parkinson's disease and even paralysis. But the divisions over how to conduct that research have been deep and bitter, and have most recently played out in the courts. Most research has been conducted on embryonic stem cell lines -- cultures of cells derived from four- or five-day-old embryos, or fertilized cells. Opponents of embryonic stem cell research, which often uses embryos discarded by fertility clinics, want it to be severely restricted or banned outright as inhumane.
The most important legislation relating to stem cell research is known as the Dickey-Wicker amendment, which first became law in 1996, and has been renewed by Congress every year since. It specifically bans the use of tax dollars to create human embryos - a practice that is routine in private fertility clinics - or for research in which embryos are destroyed, discarded or knowingly subjected to risk of injury.
For a time, the ban stood in the way of taxpayer-financed embryonic stem cell research, because embryos are destroyed when stem cells are extracted from them. But in August 2001, in a careful compromise, President George W. Bush opened the door a tiny crack, by ordering that tax dollars could be used for studies on a small number of lines, or colonies, of stem cells already extracted from embryos -- so long as federal researchers did not do the extraction themselves.
Congress continued to be inundated with calls from people suffering from diseases for which stem cells research might be the only hope, and from equally vehement opponents. In 2006, the Republican-controlled Congress passed a bill to expand research. In response, Mr. Bush issued the first veto of his presidency. In 2007, Congress, now in Democratic hands, passed a similar bill by a larger margin, but still not by enough to override Mr. Bush's veto.
On March 9, 2009, President Obama issued an executive order rescinding the limits set by Mr. Bush and making clear that the government supported stem-cell research.
In August 2010, Chief Judge Royce C. Lamberth of Federal District Court blocked Mr. Obama's executive order, saying it violated a ban on federal money being used to destroy embryos.
In May 2011, a federal appeals panel voted 2 to 1 to overturn Judge Lambert's ruling. The appeals court said that because the law is written in the present tense, “it does not extend to past actions,” meaning that research on existing lines of stem cells could continue. The ruling, however is just the latest in what is bound to be a lengthy legal battle.
Comments