Gene Drive in the News
A curated collection of articles from the popular press
Genetically Engineered Mosquito Imminent Mass Release Ignores Science, Public Health and Environmental Risks
20577H. Bourque, Friends of the Earth, 2022-03-07 11:00:22.
In defiance of science and public health concerns, today the Environmental Protection Agency (EPA) approved the mass release of billions of experimental genetically engineered (GE) mosquitoes into the United States’ most populous and agriculturally significant states. The biotechnology company Oxitec was granted an Experimental Use Permit for the release of a genetically engineered version of the species Aedes aegypti across Fresno, Tulare, San Bernadino and Stanislaus Counties in California and in Monroe County in Florida. This will be the biggest release of GE insects in the world. EPA’s approval came despite growing concerns raised by scientists, public health experts and environmental groups about potential impacts of the experimental releases to public health, the environment and endangered species. No publicly available data supports Oxitec’s claims that GE mosquitoes will reduce incidence of mosquito borne diseases. An independent peer-reviewed study from Yale University scientists revealed that over two years of continual releases of the GE mosquitoes at a test site in Brazil failed to reduce populations of Aedes aegypti. The Yale study also found that the GE mosquitoes bred with local Aedes aegypti, resulting in hybrid mosquitoes in the wild that may be more aggressive, more difficult to eradicate and may increase the spread of mosquito-borne disease.
GMO mosquitoes set for release in California to quell disease
20572M. Renda, Courthouse News Service, 2022-03-07 10:48:47.
The U.S. Environmental Protection Agency approved the experimental use of genetically engineered mosquitoes in California and Florida to reduce the populations of invasive mosquitoes that carry a host of infectious diseases like Zika and dengue fever. “With mosquito and vector-borne diseases a growing concern in California, we see Oxitec’s technology as an important additional option to control the invasive Aedes aegypti mosquito,” said Dr. Mustapha Debboun, general manager of the Delta Mosquito and Vector Control District, a government agency in the Central Valley. “We look forward to working in partnership with Oxitec and have been impressed with results from their previous projects in Brazil and the Florida Keys.” The Aedes aegypti mosquitoes were historically relegated to tropical and subtropical zones but have since invaded every continent on Earth except Antarctica. They are capable of bringing the diseases that plague tropical regions with them.
New tech fights fall armyworm by letting offspring die
20568V. Ouma, Sci Dev Net, 2022-03-01 09:43:19.
Scientists have developed a new technology that could control the devastating fall armyworm crop pest by releasing genetically-controlled males that suppress populations as subsequent offspring cannot survive, a study says. The fall armyworm, Spodoptera frugiperda, which was detected in Sub-Saharan Africa for the first time in 2016, could lead to one-third maize yield losses in some countries and up to US$6.3 billion loss annually, according to the study published in the journal BMC Biotechnology. The gene technology developed by Oxitec, a UK-based biotechnology company that genetically modifies insects to assist in insect control, enables production of male-only cohorts of the friendly fall armyworm that when released into farmer fields will mate with pest female fall armyworms, and their female offspring cannot survive, resulting in fewer pests on the crops and therefore less damage
Should we kill every mosquito on Earth?
20519J. Phelan, LiveScience, 2022-02-28 08:05:44.
Before you grab that can of bug spray, know this: While some mosquitoes are dangerous to us, not all are. Even those that are sometimes harmful tend not to feed on humans, preferring honeydew, plant sap and nectar, according to Mosquito Joe, a mosquito control company. There are around 3,500 mosquito species, but "only around 100 will potentially bite and spread disease to humans," Steven Sinkins, a professor in microbiology and tropical medicine at the Centre for Virus Research at the University of Glasgow in Scotland, told Live Science in an email. For instance, Culiseta mosquitoes often bite humans, but are not known to carry any debilitating diseases, while Toxorhynchites, which are common the world over and tend to live in forests, prefer nectar sugars to blood, according to Entomology Today. Therefore, it probably wouldn't be necessary to get rid of every mosquito species. Instead, we could target the more problematic ones, such as Aedes aegypti, which carry diseases such as yellow fever and Zika. A. aegypti is now ubiquitous, but it wasn't always this way. The species first spread out of Africa during the slave trade between the 15th and 19th centuries, through trade with Asia in the 18th and 19th centuries, and via troop movements during World War II, according to the World Mosquito Program, a nonprofit based in Australia.
A UC malaria initiative program receives grant for work researching genetically engineered mosquitoes
20483S. Slater, The California Aggie, 2022-02-23 08:39:35.
Malaria, a mosquito-borne infectious disease, was discovered in 1880, and has remained widespread in tropical regions around the equator including parts of Africa, Asia and Latin America, resulting in thousands of deaths and a significant blow to economic development in these regions. Many of the attempted strategies to eliminate malaria in the past have planned to do so by eliminating mosquitoes entirely — but according to a recent press release, the Vector Genetics Laboratory (VGL) at UC Davis, in collaboration with a UC malaria initiative program that originally started at UC Irvine, and with the financial support of a $10.2 million grant from Open Philanthropy, is taking a different approach. “Mosquitoes are a part of the ecosystem,” Greg Lanzaro, project principal investigator and director at VGL, said. “Our strategy does not eliminate mosquitoes. The mosquitoes will still be there, they’ll just be incapable of transmitting malaria. In every sense these mosquitoes are normal mosquitoes, except for the fact that they can’t transmit malaria.” The idea is called a “population modification strategy,” Lanzaro said, explaining that groups at UC Irvine and Johns Hopkins University genetically engineered mosquitoes that are incapable of transmitting the malaria parasite. “The way that malaria is transmitted is that the mosquito bites a person who has malaria and it picks up the parasite in the blood that it feeds on,” Lanzaro said. “Then the parasite develops in the mosquito so that when the mosquito bites the next person, they spread the parasite. Our mosquitoes have been engineered with a couple of genes that kill the parasite inside of the mosquito, so they’re not able to transmit.”
First ever gene-edited ticks offer new weapons against Lyme disease
20524N. Lavars, New Atlas, 2022-02-16 08:14:12.
Gene editing in ticks had been thought to be impossible until now, and with good reason. Tick embryos are very tricky to inject because the egg that contains them has a tough layer on the outside, high pressure levels inside, and is also coated in a waxy layer the mothers create using what's called the Gené's organ."Despite their capacity to acquire and pass on an array of debilitating pathogens, research on ticks has lagged behind other arthropod vectors, such as mosquitoes, largely because of challenges in applying available genetic and molecular tools," said Monika Gulia-Nuss, a co-senior author of the study and a molecular biologist at the University of Nevada, Reno. Gulia-Nuss and her research team, which included scientists from the University of Maryland and Penn State University, believe they have finally cracked the code. The first step in the breakthrough technique involves ablating the Gené's organ to prevent the formation of the waxy coating. The eggs were then treated with chemicals benzalkonium chloride and sodium chloride to both eliminate the tough protective layer and lower the pressure inside the eggs.
Could Crispr Flip the Switch on Insects’ Resistance to Pesticides?
20288E. Mullin, WIRED, 2022-02-02 11:53:17.
WHILE THE COVID-19 pandemic raged across the world in 2020, another disease was quietly infecting more than 220 million people on the continent of Africa: malaria. That year, the disease led to more than 600,000 deaths, most of them children. Caused by the parasite Plasmodium, the illness is spread through the bites of infected female Anopheles mosquitoes. Insecticide-treated bed nets and indoor spraying have long been some of the most effective strategies for combating the disease. But decades of using these chemicals has lessened their potency. It happens like this: Insecticides kill off most of the mosquitoes in an area. But a small number may survive because something about their genetic makeup makes them unaffected by the pesticide. Mosquitoes within that small population mate with each other and pass on their genes to their offspring, breeding more resistant mosquitoes. In some cases, resistance has built up just a few years after the introduction of an insecticide. It makes fighting deadly mosquitoes a constant game of whack-a-mole. Insecticides remain the frontline in fighting malaria, because interventions like building mosquito-resistant housing are still experimental, and the effort to develop a vaccine has taken decades. Last summer the World Health Organization recommended Mosquirix, the first anti-parasitic vaccine, for African children under age 5, but it is only 30 percent effective at preventing serious disease, and will take many years to achieve approval and distribution among individual nations.
Gene Editing Is Popular, But Controversial, Research Are
20387Relias, RELIAS MEDIA, 2022-02-01 09:18:26.
Gene drive research carries great potential for controlling insect vectors of devastating diseases, but there are multiple unresolved ethical concerns. Unanticipated “downstream” effects on ecosystems, or in organisms that carry the gene drive machinery, are possible. To help researchers balance risks and benefits for society and humanity, scientists involved in the Controlling and Countering Gene Editing in Mosquitoes research project developed a code of ethics for gene drive research. Today, gene drive researchers are focused on diseases that mosquitoes carry. The goal is to make a mosquito that cannot infect a person with malaria. “All of a sudden, it’s become a very hot research area. With the discovery of CRISPR, everybody wants to apply CRISPR to everything. But here is an area where it actually makes sense,” says lead author George J. Annas, JD, MPH, director of the Center for Health Law, Ethics, and Human Rights at Boston University.
Crisp Genes
20283J. Mckenna, The Simple Science, 2022-01-29 11:44:36.
Imagine we had the power to use genetic technologies to stop one of humanity’s most dangerous predators. What is that predator? Sharks? Crocodiles? Snakes? Think far, far smaller. It is in fact, the mosquito.Mosquitos cause all sorts of nasty diseases like the Zika Virus, Dengue Fever, Yellow Fever, and malaria. While nobody really wants to contract any of those diseases, and they’ll all make you pretty miserable, they’re nothing compared to the frankly hellacious malaria being one of the single biggest killers of humans in history. Well, plot twist, we actually do have the technology and it comes in the form of some genetic machinery discovered in bacteria: CRISPR-Cas9 (or CRISPR for short).
Scientists find transmission chain-breaker, give new hope for fight against malaria
20473ANI, ANI, 2022-01-27 08:09:19.
A recent study, published online in 'PLoS Biology', has revealed that blocking a key protein found in Anopheles gambiae mosquitoes -- the principal vector for malaria transmission to humans in Africa could thwart infection with malaria parasites and thus prevent them from transmitting the parasites to humans. The study was undertaken by Johns Hopkins Malaria Research Institute at the Johns Hopkins Bloomberg School of Public Health. In a lab experiment, the researchers used CRISPR/Cas9 gene-editing technology to delete the gene for a protein called CTL4 from Anopheles gambiae mosquitoes. This deletion made the mosquitoes highly resistant to the malaria parasite. The researchers found that disrupting the CTL4 protein brought a 64 percent decrease in infection prevalence. The researchers believe that targeting the CTL4 protein could be the basis for new strategies to control malaria in regions where it is still endemic.
Track New Zealand’s Bid to Take Back Nature
20169K. Peek, Scientific American, 2022-01-25 09:05:48.
A thousand years ago the islands that today form New Zealand were riotously wild. Birds, reptiles and invertebrates flourished in lush forests hundreds of miles from any other landmass. Māori settlers in the 1200s brought Polynesian rats for food, and together the humans and the rodents began to shift the ecological balance. Native species started to go extinct. Enter European ships, bearing new carnivores: more aggressive rat species, plus mice, stoats, and others. These ground-based predators hunted differently from the falcons and other aerial threats New Zealand wildlife had evolved with. Native birds that slept in burrows made easy prey for prowling mammals. Invasive predator populations exploded, devastating native wildlife. But in the past 60 years humans have intervened to help old New Zealand ecosystems claw their way back. First, a single five-acre (two-hectare) islet called Maria Island (Ruapuke in Māori) was declared rat-free by ecologists in 1964, five years after volunteers set poisoned bait. It was a special case. The white-faced storm petrels at risk there were especially charismatic—they appear to walk on water—and easily gained public support. The ample baiting effort also got particularly lucky with its placement, ecologists say. Nevertheless, the serendipitous success kicked off decades of eradication efforts.
Could we delete diseases passed down through our DNA?
20278E. Rayne, SYFY, 2022-01-23 11:33:23.
What has now been proven possible was once the stuff of science fiction dreams. CRISPR has shown it can successfully edit out detrimental genetic conditions before they are inherited — which could mean the beginning of the end for hereditary diseases. It could also help obliterate invasive species from ecosystems under attack. Imagine if gene editing could delete conditions you never asked to be born with while getting rid of the cane toad invasion in Australia. CRISPR-Cas9 has been able to successfully edit DNA again and again, but it’s never done anything like this. Kind of like DNA autocorrecting itself, the editing needs to make deletion in a cell happen during a certain phase of meiosis. Researcher Kimberly Cooper of UC San Diego, who coauthored a study recently published in PLOS Biology, figured out exactly when to get to that meiotic window and how to control which copies of genes are handed down to the next generation.
Gene drives and metaphors
20127B. Nerlich, Making Science Public, 2022-01-21 09:32:53.
I have been writing about developments in the biosciences for twenty years. In that time, I have covered a wide variety of topics, such as cloning, genomics, the human genome project, the microbiome project, faecal microbial transplants, synthetic biology, epigenetics, genome editing and now gene drive. I was lucky enough to get many reflections on these topics (by me and other colleagues!) published in the appropriately titled journal New Genetics and Society. The newest addition to this family of articles is one on gene drives – a range of controversial technologies that can potentially be used for the eradication or conservation of animal species – written with Aleksandra Stelmach. It has a certain family resemblance with the other articles, as it too deals with the use of metaphor in framing a particular issue in the biosciences. However, it is also quite different. While the other articles mainly examined media articles on the genetic or genomic topics they covered, this article is based on the analysis of interviews with gene drive experts and practitioners reflecting on their and others’ uses of metaphors. The article was prompted by emerging findings from a Wellcome Trust funded project, led by Sarah Hartley, aiming to increase understanding of how people communicate about gene drives. Aleksandra carried out 30 interviews with scientists, experts, and NGOs working in sectors or being involved in sectors relating to gene drive research in the United Kingdom, the United States, and Australia.
CRISPR Technology Can Eliminate Disease-Spreading Mosquitoes
20133S. Krishana, Now, 2022-01-19 13:10:41.
Scientists have uncovered a new technique they call the “precision-guided sterile insect technique,” or pgSIT. While most CRISPR procedures affect organisms that spread diseases by passing a gene change down generations, this system is more limited. It targets male mosquito genes that are linked to fertility. As a result of changing these genes, any offspring these mosquitoes have would be infertile. “pgSIT is a new scalable genetic control system that uses a CRISPR-based approach to engineer deployable mosquitoes that can suppress populations,” said Omar Akbari, one of the study’s authors. “Males don’t transmit diseases, so the idea is that, as you release more and more sterile males, you can suppress the population without relying on harmful chemicals and insecticides.” But it’s the female population that spreads diseases, so pgSIT targets them, as well. According to the study, the CRISPR technology treatment renders female mosquitoes unable to fly or hold their wings up. It also makes them slower and more lethargic in their movements. Combined, these effects lower the chances that these female mosquitoes will mate or successfully find a blood source and attach to it to spread disease.
Genetic Strategy Reverses Insecticide Resistance
20108H. Tasoff, The Current, 2022-01-18 17:08:09.
University of California biologists have now developed a method that reverses insecticide resistance using CRISPR/Cas9 technology. A team including UC Santa Barbara researchers Craig Montell(link is external) and Menglin Li(link is external), UC San Diego researchers Bhagyashree Kaduskar, Raja Kushwah and Professor Ethan Bier of UCSD’s Tata Institute for Genetics and Society (TIGS) used the genetic editing tool to replace an insecticide-resistant gene in fruit flies with the normal insecticide-susceptible form. Their achievement, described in Nature Communications(link is external), could significantly reduce the amount of insecticides used. “This strategy could be used to reverse the resistance of mosquito disease vectors that spread devastating diseases that impact hundreds of millions of people each year,” said Craig Montell, a professor of molecular, cellular and developmental Biology at UC Santa Barbara.
Nuclear technique cuts mosquito numbers in Cuban trial
20111M. A. Madsen, IAEA, 2022-01-13 17:14:31.
A pilot trial of a SIT campaign was conducted between April and August 2020 in an area of 50 hectares in El Cano, an isolated neighbourhood of southwest Havana. Arroyo Arenas, another neighbourhood of similar size, was used as an untreated control site. In the pilot trial, almost 1.3 million sterile male mosquitoes were released. Male mosquitos do not carry dengue, bite, nor feed on blood. The IAEA supported Cuba in attaining equipment to separate male and female mosquitoes ahead of irradiation and release and helped equip mosquito rearing facilities. Prior to the trial, Cuba had little capacity in insect rearing and the IAEA supported Cuban fellows to be sent for training on the technique in Brazil, Colombia, Mexico and at the IAEA laboratories in Austria. "Using the SIT for mosquitoes is relatively new anywhere in the world, and pilot trials like this one show how promising they can be," said Rui Cardoso Pereira, Head of the Insect Pest Control Section at the Joint FAO/IAEA Centre of Nuclear Techniques for Food and Agriculture.
Scientists expand CRISPR-Cas9 genetic inheritance control in mammals
20038M. Aguilera, Phys Org, 2022-01-12 09:43:07.
Led by graduate student Alexander Weitzel, Grunwald, Cooper and their colleagues have now succeeded in developing CRISPR-Cas9 inheritance control in male mice by shifting the gene editing window to more closely match the timing of meiosis in both sexes. Their results were published December 23, 2021 in the journal PLOS Biology. The achievement advances the prospects of scientists being able to use genetic editing for new laboratory models in an array of research pursuits, from investigations of human disease to therapeutic drug design to invasive species removal. "For these gene conversion strategies to work in any context—in the lab or in wild populations—you need the mechanism of gene conversion to work in both males and females," said Cooper, associate professor in the Section of Cell and Developmental Biology, Division of Biological Sciences. "It seems as though the reason this process was previously working in females is because we were closer to the female meiotic window. Now that we've moved Cas9 expression to within the meiotic window in males, it works in them too."
Information Sharing in Senegal on the Gene Drive Technology as a potential Complementary Tool for Malaria Vector Control
19902AUDA-NEPAD, AUDA-NEPAD, 2022-01-04 08:23:49.
AUDA-NEPAD in partnership with the National Biosafety Authority (Autorité Nationale de Biosécurité (ANB) in Senegal organized an Information sharing meeting on the gene drive technology as a complementary tool for malaria vector control, from 22-23 December 2021, in Somone, Senegal. The key objective of the meeting was to discuss the opportunities offered by gene drive technology for malaria control, based on the current state of art of knowledge and experiences from countries that are testing this approach. Sixty people, including key stakeholders from relevant institutions in Senegal and experts from Burkina Faso and Mali took part in the meeting. In his opening remarks, Mr. Ousseynou Kassé, Executive Director of ANB thanked AUDA-NEPAD for the support provided in the organization of this meeting. He also thanked the experts from Burkina Faso and Mali who came to share their experiences on the subject. “We started the discussions on the Gene Drive approach some years ago at the COP-MOP meeting held in Mexico and we continued it in the past years in the sub-region. Recently we were in Accra twice to discuss the same topic ahead of the next COP-MOP meeting”, he said. Mr. Yero Dé, Chairperson of the Orientation Council of ANB, highlighted that the meeting seeks to improve stakeholders’ understanding of the gene drive technology as a novel malaria control approach. “We need to consider adopting this new approach through an open discussion on how this technology could be used in the health sector and in particular in malaria control and elimination. Malaria mortality rate is very high in most of our countries and the efforts deployed so far to control the disease face important challenges, including the resistance of the vector to the current treatments”, he further stated.
How sci-fi weapon could stop grey squirrels killing Britain’s trees
19723rymeradelle, INentertainment, 2021-12-23 12:41:06.
Grey squirrels pose the greatest threat to British foresters at the moment. They eat the bark of trees, leaving them to die. Picture: Grey squirrel perched on a tree It’s bad enough watching Britain’s ash trees wither from the ash dieback fungus now ravaging our countryside. We can only do so much. The squirrel is an exception to this rule. And it’s not just trees which are paying the price. This pest kills songbirds, and also pinches nests. Worse still, our native red squirrel, which once roamed the entire country — without chewing trees to death — is now an endangered species, clinging on in pockets of Scotland and places such as the Isle of Wight. The number of people living in the area is estimated to be around 200,000. Red Squirrel Survival Trust will make an announcement next month, with Red Squirrel Day on January 21. Its patron, the Prince of Wales, loves the vanishing red so much that he has a squirrel-feeding table in the hallway at Birkhall, his home on the Balmoral estate (where he has also erected ‘Squirrel Crossing’ road signs).
Scientists Used CRISPR Gene Editing to Choose the Sex of Mouse Pups
19906S. Fan, Singuarity Hub, 2021-12-23 08:37:01.
“Do you want a boy or a girl?” can be an awkward question.But in certain circles, it’s a question that’s asked every day. Take agriculture. In a perfect world, most cows would only birth females. Chicks would grow up to be all hens. “Sexing” a farm animal when they’re at a young age wouldn’t be a thing—especially when it means male animals, without the ability to produce milk or eggs, are often culled at a young age to preserve resources. There might be a better way. This month, a team tapped into the power of CRISPR to control the sex of the offspring in mice. By splicing CRISPR components into the parents’ genome, the team was able to flip on—or off—a switch that nearly perfectly determined the sex of their litters. Unlike previous attempts, the baby mice could go on to have litters of their own of both sexes. The targeted gene used for the edit is conserved across evolution, suggesting the technique could work in more animals than just mice. But it’s controversial. Essentially, the technique selectively kills off embryos of a certain sex, which immediately raises ethical red flags. For now, scientists aren’t concerned about the technology being used in humans due to its complexity. But the study is the latest to showcase biotech’s increasing ability to manipulate reproduction.
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