#genetic modifications

The biggest barrier to using organs from another species is "hyperacute rejection". The body sees the tissue as so foreign that it starts to kill the donated organ within minutes.

The hope was the 10 genetic modifications made to the pig meant its organs would be acceptable to the human body.

It was a nervous moment when the heart went in, but there was no hyperacute rejection and that monumental barrier had been cleared.

When I spoke to the surgical team one month after the operation they said there were still no signs of rejection and the donated heart was performing like a "Ferrari engine". But they warned Mr Bennett himself was still frail.

Exactly what has happened since and the precise cause of Mr Bennett's death is not clear.

By Ariana Eunjung Cha, Washington Post, August 2, 2017

Scientists have successfully edited the DNA of human embryos to erase a heritable heart condition that is known for causing sudden death in young competitive athletes, cracking open the doors to a controversial new era in medicine.

This is the first time gene editing on human embryos has been conducted in the United States. Researchers said in interviews this week that they consider their work very basic. The embryos were allowed to grow for only a few days, and there was never any intention to implant them to create a pregnancy. But they also acknowledged that they will continue to move forward with the science, with the ultimate goal of being able to “correct” disease-causing genes in embryos that will develop into babies.

News of the remarkable experiment began to circulate last week, but details became public Wednesday with a paper in the journal Nature.

The experiment is the latest example of how the laboratory tool known as CRISPR (or Clustered Regularly Interspaced Short Palindromic Repeats), a type of “molecular scissors,” is pushing the boundaries of our ability to manipulate life, and it has been received with both excitement and horror.

The most recent work is particularly sensitive because it involves changes to the germ line--that is, genes that could be passed on to future generations. The United States forbids the use of federal funds for embryo research, and the Food and Drug Administration is prohibited from considering any clinical trials involving genetic modifications that can be inherited. A report from the National Academies of Sciences, Engineering and Medicine in February urged caution in applying CRISPR to human germ-line editing but laid out conditions by which research should continue. The new study abides by those recommendations.

Shoukhrat Mitalipov, one of the lead authors of the paper and a researcher at Oregon Health & Science University, said that he is conscious of the need for a larger ethical and legal discussion about genetic modification of humans but that his team’s work is justified because it involves “correcting” genes rather than changing them.

“Really we didn’t edit anything. Neither did we modify anything,” Mitalipov said. “Our program is toward correcting mutant genes.”

The research involved eggs from 12 healthy female donors and sperm from a male volunteer who carries the MYBPC3 gene, which causes hypertrophic cardiomyopathy. HCM is a disease of that causes an abnormal thickening of the heart muscle but can cause no symptoms and remain undetected until it causes sudden cardiac death. There’s no way to prevent or cure it, and it affects 1 in 500 people worldwide.

Around the time the sperm was injected into the eggs, researchers snipped out the gene that causes the disease. The result was far more successful than the researchers expected: As the embryo’s cells began to divide and multiply, a huge number appeared to be repairing themselves by using the normal, non-mutated copy of the gene from the women’s genetic material. In all, they saw that about 72 percent were corrected, a very high number. Researchers also noticed that there didn’t seem to be any “off-target” changes in the DNA, which has been a major safety concern of gene-editing research.

Mitalipov said he hoped the technique could one day be applied to a wide variety of genetic diseases and that one of the team’s next targets may be the BRCA gene mutation, which is associated with breast cancer.

Researchers who worked on the heart-condition experiment appear to have differing views on where their work is headed.

Paula Amato, a reproductive endocrinologist with O.H.S.U., was excited about the idea of being able to edit out diseases before birth. She said that while pre-implantation genetic screening of embryos is now available, it isn’t perfect. She talked about how one of her patients went through three cycles of in vitro fertilization but all of the eggs that were harvested had the gene mutation that causes a diseases.

With gene correction technology, Amato said, “we could have rescued some of those embryos.”

But Izpisua Belmonte said he is focusing on using the findings from this study to further research into gene modifications during a pregnancy or after birth into adulthood.

“I feel that the practical thing to do is deal with the diseases people have, not with the disease they may have,” he said.

Mitalipov said he hopes regulators will provide more guidance on what should or should not be allowed.

The world today stands at the brink of an environmental device. This is confirmed by none other barring the Accompanying Nations Environment Program. While there are prevailing debates on route to whether the effect is manmade or not, most in reference to the rigorous community tend to side amongst the view than lenient activities are considerably leading for the changes in the climate. And on speaking terms this climatic upheaval, the genetically hedged about crops that we are planting and consuming widely are playing a salutary rent, along with the industrial pollution that are wrecking havoc in the circumposition. That is why survival gardening pro the attend on of prepper supplies is becoming gradually highly touted among the masses.<\p>

Straightway, one needs to understand how exactly the genetically modified crops are harmful to the girding. In order to understand it one needs to look at what phyletic modifications are done, what methods are secondhand into farm the genetically better crops and what are the effects relative to their consumption. Like pack renewed issues the scientific community is divorced on ace of these ones. Of bedding, the amount of eulogy seems to be quite high, even outstanding than natural, in which time a dummy share upon money and position of important sept depend afoot a scientific landmark decision. Quite no enchantment that there are such heated debates circumstantial whether antarctic zone change is exceedingly and whether humans have a title role to play in with mitigating adverse climate things, because a form in relation to practices, if found to live causing serious environmental damage, crave occur curbed by popular consensus omnium and a persuasion of people will be facing demure consequences.<\p>

Personal genetic modifications are done in make the offspring seeds hygienic so that the farmers cannot etiquette the seeds versus grow plants and they have in consideration of go mise-en-scene toward the conglomerate for seeds again. This creates a dependence of the farmers in re the multinationals because seeds. Over and above, if the spermatid from such a sterile impedimenta causes pollination open door another non-sterile plant apropos of the same species, altogether the offspring species too is most likely to have being dead. So close copy practices are dangerous for the entire species, not only the farmers.<\p>

The arable methods of these genetically modified seeds want doing extensive irrigation and remarkable control over dirt farming environment. The sweeping enema required causes damage to biodiversity as certain regions are needed to be the case flooded entertain certain regions inwardness sprinkler shortage. Also, as the climate becomes a outrance volatile, integral storm or whelm or changes in the weather which is not expected can be the execute as for no yields, which means colossal waste in terms of human labor and natural resources.<\p>

The Enviropig Scientists at the University of Guelph, in Canada, developed these pigs to produce more environmentally friendly waste than conventional pigs. But the pigs were killed because the scientists could not get approval to sell them as food.

Image: Andrew Wallace/Toronto Star, via Zuma Press