Gene Drive in the News
A curated collection of articles from the popular press
Genetically modified mosquitoes … could CRISPR gene editing end malaria?
24315D. Wells, SelectScience, 2022-12-22 08:44:13.
Despite being a preventable and treatable disease, malaria is currently affecting the lives of more than 200 million people.1 This results in over half a million deaths per year, with 80% of this mortality occurring in children under the age of 5.2 In addition to the tragic social and humanitarian considerations, the economic losses to Africa attributed to malaria equate to around $12 billion a year.3 Hence, the public health burden of malaria is huge, and continued efforts in malaria control, elimination strategies, and case management are crucial to minimizing the devastation that malaria has on at-risk communities. In this article, we explore the innovative use of genetically modified mosquitoes as a means of fighting this devastating disease.
New CRISPR tech makes it possible to wipe out invasive mice
241812022-12-11 11:12:20.
East Maui project hopes mosquito v. mosquito mating battle will save endangered birds
24173K. Cerizo, MAUINOW, 2022-12-11 11:03:34.
Good news in the fight against vector-borne diseases
24175K. Magori, 2022-12-09 11:07:13.
At the turn of the century, several research groups attempted to apply modern genetic methodologies to achieve similar outcomes without the need for irradiation and the resulting fitness costs. Luke Alphey and his colleagues at Oxford University developed a dominant lethal genetic system for autocidal control in the Mediterranean fruitfly, where a transactivator causes lethality in the early developmental stages of heterozygous insects unless repressed by tetracycline. The company he funded (Oxitec Limited) successfully adapted this system in several agriculturally important pest species, as well as in Aedes aegypti and other mosquitoes. (Full disclosure: I worked at Oxitec Limited in 2007, but own no shares or have any other conflict of interest with them). While the first generation of these mosquitoes proved to successfully reduce wild-type mosquito populations, they required labor-intensive separation of male and female mosquitoes before release in close proximity. While this ensured that only non-biting male mosquitoes are released, it also limited the scalability of this approach.
Experts urge caution over biotech that can wipe out insect pests
24153L. Fauvel, Phys Org, 2022-12-09 07:09:45.
Dozens of scientists, experts and campaigners called for a ban on the release of genetically-edited organisms into the wild, in a statement Friday warning of potentially severe risks to the world's pollinators. The appeal was launched at crunch biodiversity talks in Montreal, where delegates from almost all the world's countries were meeting to negotiate a strategy to halt human environmental destruction, which threatens the natural life support systems of the planet. A host of new genome-editing tools that modify the genetic material of living beings have emerged in recent years, and are being researched and developed largely to target insects and plants in agriculture. Supporters argue that they could help human health, agriculture and even species conservation. But their use in the wild carries "understudied risks which could accelerate the decline of pollinator populations and put entire food webs at risk," according to the letter drafted by the French non-governmental organization Pollinis.
How selfish genes succeed
24155Stowers Institute for Medical Research, ScienceDaily, 2022-12-08 07:17:01.
A new study reveals how a selfish gene in yeast uses a poison-antidote strategy that enables its function and likely has facilitated its long-term evolutionary success. This strategy is an important addition for scientists studying similar systems including teams that are designing synthetic drive systems for pathogenic pest control. Collective and collaborative advancement on understanding drive may one day lead to the eradication of pest populations that harm crops or even humans in the case of vector borne diseases.
A natural gene drive could steer invasive rodents on islands to extinction
24129B. Brookshire, ScienceNews, 2022-12-05 09:12:58.
In the battle against the invasive house mouse on islands, scientists are using the rodent’s own genes against it. With the right tweaks, introducing a few hundred genetically altered mice could drive an island’s invasive mouse population to extinction in about 25 years, researchers report in the Nov. 15 Proceedings of the National Academy of Sciences. The trick is adding the changes to a section of mouse DNA that gets inherited far more often than it should. Scientists have been creating similar extra-inheritable genes — called gene drives — in the lab. The chunks are designed to get passed on to most or all of an animal’s offspring instead of the usual half, and make those offspring infertile in the bargain. Scientists have used gene drives to reduce populations of mosquitoes and fruit flies (SN: 12/17/18). But mammals are a different story. Scientists have previously synthesized a gene drive that gets passed on in mice about 80 percent of the time (SN: 1/23/19). But the drive isn’t strong enough to stop a population quickly. Luckily, nature has it handled. A haplotype is a naturally occurring group of genes that gets passed on as a unit during replication. The genome of the house mouse (Mus musculus) has a particular haplotype, called the t haplotype, that gets passed on to offspring more than 95 percent of the time, instead of the typical 50 percent.
East African policy dialogue on research of genetically modified mosquitoes for malaria control and elimination
24112C. Mugoya, Target Malaria, 2022-12-02 09:27:43.
The East African Community Secretariat, in collaboration with the East African Health Research Commission; NEPAD, AFIDEP and IFAKARA Health Institute recently convened an East African regional dialogue in Dar es salaam, Tanzania from 17-19 November 2022 to deliberate the way forward on the legal and regulatory frameworks guiding research on genetically modified mosquitoes to solve the problem of malaria in the East African region. The dialogue was attended by legislators from the seven countries of the East African Community partner states – Kenya, Uganda, Tanzania, Burundi, DR Congo, Rwanda and South Sudan, policy makers, government officials, and health experts including biotechnology/biosafety regulators.
Oxitec’s mosquitoes are getting “friendly” with California
24109L. Patrick, The Sun Gazette, 2022-12-01 09:34:07.
Biotech company Oxitec is buzzing around Visalia, with the hopes of releasing their genetically engineered mosquitoes in Tulare County. Oxitec has one more hurdle to jump over in order to release their “friendly” Aedes aegypti mosquitoes in Tulare County, and that’s to gain the approval of the California Department of Pesticide Regulation (DPR). Though their attempts to release their GE mosquitoes in California have been met with both supportive and hesitant reactions from different state agencies and environmental groups, Oxitec’s Dr. Kevin Gorman said the technology has been researched and reviewed with “much scrutiny,” despite claims that the mosquitoes are ineffective or hazardous. “We have a biological approach to managing pest insects, and the biological approach is a mating-based technology. It’s very targeted, it only affects the species that [they’re] mating with,” Gorman said. “Not only is it environmentally safe, it’s effective.” The male GE mosquitoes from Oxitec have been engineered with a self-limiting gene, and this gene infects wild female mosquitoes to prevent them from reproducing female offspring. This leaves only male mosquitoes in the gene pool, according to Gorman. Female mosquitoes are targeted since they are the only ones that bite, and therefore capable of transmitting diseases. The engineered males will only mate with Aedes aegypti females, and do not leave an environmental footprint, according to Gorman. The release of these mosquitoes is supposed to reduce the natural population of the invasive mosquito, which are known to carry diseases such as dengue, chikungunya, Zika, yellow fever and others.
Scientist Recommends Gene Drive Strategies Of Pest Control To Increase Food Security
24062L. Agbo, allnews, 2022-11-28 16:46:37.
A Nigerian scientist, Dr. Rose Gidado has recommended that Nigerian policymakers and farmers adopt the technology of a gene drive-based pest management technique in order to increase bumper harvest and food security.In an interview with NAN on Monday in Abuja, Gidado, the Deputy Director at the National Biotechnology Development Agency (NABDA) and the OFAB's Country Coordinator, made the statement.In order to attain food security, which would lead to national development, she claimed that Nigerian farmers needed to accept the use of gene drive technology for their seeds and food crops.“Gene drives are systems that warrant biased inheritance by improving the possibility of DNA sequence passing from one generation to the other via sexual reproduction and potentially throughout an entire population.“It is a modern biotechnology technique that alters the tendency of transmitting a specific allele from the natural 50 per cent probability by propagating a particular set of genes throughout a population,’’ Gidado said.
That new chestnut? USDA plans to allow the release of GE trees into wild forests
24060D. E. Davis, The Hill, 2022-11-27 16:42:48.
In the 21st century, there are those who believe the trees can be resuscitated via genetic engineering (GE). In fact, the U.S. Department of Agriculture (USDA) has just released a draft environmental impact statement and draft plant pest risk assessment that will allow the unrestricted planting of blight-tolerant GE chestnut trees on public and private lands. If approved, the tree would be the first genetically engineered plant released with the purpose of spreading freely into the wild. Although the agency is recommending the tree’s release into wild forests, they are also requesting public input regarding their recent decision to do so. (You can submit comments here.) The restoration of the American chestnut is a noble undertaking that certainly deserves our serious consideration and thoughtful deliberation. If the plan is accomplished successfully, the tree would improve forest health, increase biodiversity, and provide important economic benefits for local communities. However, as an environmental historian, I am deeply concerned that individuals endorsing the unregulated status of the GE chestnut have not sufficiently educated themselves about potential problems associated with genetically modified trees
Should NZ use contentious gene tech in our war on pests?
24032J. Morton, NZ Herald, 2022-11-27 09:45:02.
Gene-altering technology could offer “breakthrough opportunities” for saving our pest-threatened species, a new future-scoping report says, but there’d be some tricky issues to address before it’d be a realistic option. Scientists have already been exploring how these contentious tools - among several areas canvassed in a new future-focused briefing by the Department of Conservation and Land Information New Zealand - might aid our ongoing war on pest predators. But it’s doubtful that would happen anytime soon, given the tech isn’t yet ready, and the Government has little appetite toward making law changes that’d likely be needed to unleash it in our environment. The briefing, just put out for public feedback, explained how gene-editing tools like Crispr-Cas9 could be used to change particular genes or introduce new traits.
Discovery of 119-Million-Year-Old “Selfish” Genes Casts Doubt on Established Evolution Beliefs
24042Stowers Institute for Medical Research, SciTechDaily, 2022-11-23 10:50:53.
Meiotic drivers, a kind of selfish gene, are indeed selfish. They are found in virtually all species’ genomes, including humans, and unjustly transfer their genetic material to more than half of their offspring, resulting in infertility and impaired organism health. Their longevity over evolutionary time was thought to be brief due to their parasitic potential, until recently. The Stowers Institute for Medical Research, in collaboration with the National Institute for Biological Sciences in Beijing, China, has discovered a selfish gene family that has survived for over 100 million years—ten times longer than any other meiotic driver ever identified—calling into question established beliefs about how natural selection and evolution deal with these threatening sequences.
Turns Out Fighting Mosquitoes With Mosquitoes Actually Works
24018E. Mullin, Wired, 2022-11-21 08:56:57.
In the Brazilian city of Indaiatuba, an effort is underway to eliminate these pests before they have a chance to spread illness. The weapon: more Aedes aegypti mosquitoes—but ones genetically engineered to kill their own kind. Made by British biotechnology firm Oxitec, the mosquitoes seem to be working. The modified mosquitoes carry a synthetic self-limiting gene that prevents female offspring from surviving. This is important, because only the females bite and transmit disease. In a new study, scientists at the company showed that their engineered insects were able to slash the local population of Aedes aegypti by up to 96 percent over 11 months in the neighborhoods where they were released. “This is an area with high levels of Aedes aegypti, and they periodically have outbreaks of dengue,” says Nathan Rose, head of malaria programs at Oxitec. In fact, this summer the Brazilian Ministry of Health reported that dengue fever was continuing to spread in all five regions of the country. Between January 1 and May 31, Brazil had more than 1.1 million cases—an increase of 198 percent compared to the same period in 2021. In those five months, the disease, which causes high fever, rash, and muscle and joint pain, killed 504 people. For the study, which was conducted in 2018 and 2019, the company chose four densely populated neighborhoods with high levels of Aedes aegypti. In two, scientists released a “dose” of 100 male mosquitoes per resident per week. In the others, they cranked that up to 500.
Should we use a genetic weapon against mosquitoes carrying malaria?
23988T. H. Saey, ScienceNewsExplores, 2022-11-17 08:58:08.
In a large laboratory cage, a male mosquito carries a genetic weapon that could launch the destruction of his species. That loss could also mean the end of the parasite that causes malaria. The weapon? A self-replicating bit of DNA known as a gene drive. It’s one of the most anticipated tools being developed to stop mosquitoes from spreading diseases like malaria to humans. It’s also one of the most controversial. The gene drive interferes with the insects’ ability to reproduce. In one small lab study, it wiped out captive populations of mosquitoes in just eight to 12 generations. A larger study in outdoor cages in Terni, Italy, worked too. Within as little as five to 10 years, this gene drive could be ready to test in the wild. Researchers are eyeing Africa for the first test release. There, malaria takes a huge toll. In 2020, it sickened close to 241 million people on the continent. And most of the globe’s 670,000 malaria deaths that year were in Africa. About eight in every 10 were children, the World Health Organization says. Many tools have been made to fight the disease. There are preventive drugs, insecticide-treated bed nets and even vaccines. These efforts are helping. But mosquitoes are developing resistance to insecticides. And some anti-malaria drugs may no longer work well. “To go toward zero [cases], we need to have something that is transformational,” says Fredros Okumu. By that, he means a completely new type of strategy. Okumu is a mosquito biologist. He directs science programs at Ifakara Health Institute in Tanzania, a country in East Africa. Gene drives might be the big change people are looking for. This technology was first devised in 2015. Researchers are still refining and testing it. Other types of genetically altered mosquitoes have been released in Brazil, the United States and elsewhere. But so far, those altered genes spread slowly among wild populations. Gene drives could potentially spread to nearly every member of a species quickly. In this way, they could forever alter the species. Or even wipe it out.
Health experts meet in Dar over use of GMO mosquitoes to fight Malaria
23991M. Chelangat, NATION, 2022-11-16 09:03:01.
Regional health think thanks led by the African Institute for Development and Policy (AFIDEP), East African Community(EAC) Health department, East African Health Research Commission and Ifakara health institute will be meeting in Dar es Salaam, Tanzania for three day starting tomorrow to discuss the development of genetically modified mosquitoes to help in controlling and eliminating malaria.The experts will also be discussing regulatory reforms and policies, given that regulatory frameworks of many African countries do not provide clear guidance on how to develop and test genetically modified mosquitoes. According to the Centers for Disease Control and Prevention (CDC), genetically modified mosquitoes are mass produced in a laboratory to carry two types of genes.
Gene drive could be used to wipe out invasive mice on islands
23862M. Le Page, NewScientist, 2022-11-11 10:11:35.
For the first time, researchers have created a gene drive – a kind of genetic parasite – that could be used to eradicate mammalian pests such as mice by making them infertile. The technology could provide a humane alternative to the poison baits currently used to tackle invasive mice on islands, which have severe impacts on native birds, reptiles and plants. “It’s the first example of a mammalian gene drive technology that has had proof of concept in a laboratory setting,” says Paul Thomas at the University of Adelaide in Australia. Most animals have two copies of each chromosome, but their offspring gets only one copy from each parent. This means that if a piece of DNA is added to one chromosome of an individual, only half its offspring will inherit it. Gene drives are bits of DNA that encode various mechanisms for cheating the system and ensuring they get inherited by more than half of offspring. This means they can spread in a population even if they are harmful. Various kinds of natural gene drives have been discovered. In 2013, Kevin Esvelt at Massachusetts Institute of Technology created the first synthetic gene drive using the gene-editing technology CRISPR. Such CRISPR-based gene drives work extremely well in insects and several teams hope to use them to prevent the spread of malaria, either by wiping out mosquitoes or by making them less likely to infect people.
World first trial to eradicate mice through gene modification
23838I. Mannix, COSMOS, 2022-11-10 09:51:29.
Mouse populations could be eradicated in some areas through new gene modification technology to render female mice infertile. The technology – called t-CRISPR – was previously developed to target malaria-transmitting mosquitoes. This is the first proof of concept for its use as a mammalian genetic biocontrol tool targeting house mice, which is an invasive pest in Australia. In time, it could be used to control rodents on islands and landmasses where they cause widespread destruction. The research, published in Proceedings of the National Academy of Sciences, is the first time t-CRISPR has been successfully tested on mammals in a laboratory setting, according to senior author Professor Paul Thomas. Computer modelling conducted by the team suggests about 250 gene-modified mice could eradicate an island population of 200,000 mice in around 20 years. “We have had mouse plagues in Australia for 150 years and existing controls, like baits, cause inhumane death and are expensive and labour intensive to deploy,” says Thomas, who works across the University of Adelaide and the South Australian Health and Medical Research Institute.
Gene drive technology to suppress invasive mice
23843University of Adelaide, Phys Org, 2022-11-09 09:55:57.
Researchers at the University of Adelaide have released their first findings on the potential effectiveness of revolutionary gene drive technology to control invasive mice. The team has developed a world-first proof of concept for the technology—called t-CRISPR—using laboratory mice. Using sophisticated computer modeling performed by co-first author Dr. Aysegul Birand, the researchers also found about 250 gene-modified mice could eradicate an island population of 200,000 mice in around 20 years. The results of the study have been published today in Proceedings of the National Academy of Sciences.
Calif. Legislature bites back at GE mosquito releases
23866L. Patrick, Sun Gazette, 2022-11-08 10:15:50.
A biotech company created millions of genetically modified mosquitoes, but not in the Jurassic Park sense. The lab grown species could actually lower the population of an invasive mosquito that carries a plethora of diseases on its shoulders.On Nov. 3, several members of the California legislature sent a letter to the Department of Pesticide Regulation (DPR) asking it to delay the release of millions of genetically engineered (GE) mosquitoes in Tulare County by Oxitec, a British biotech company, in the interest of further regulatory review. The GE mosquitoes are meant to lower the population of Aedes aegypti, an invasive mosquito that has been plaguing communities in the county for the last few years. However, members of the legislature are pushing for the DPR to resist the GE mosquitoes because of unforeseen effects they might have on people and the environment. This would be the first experimental release of of the non-biting mosquitoes, which OxiTec calls “friendly mosquitoes,” in Tulare County. Though the U.S. Environmental Protection Agency approved the release of the mosquitoes on March 7, the agency has been awaiting approval from DPR for several months, even after a 15-month scientific evaluation process and a 15-day public comment period that ended on April 19.
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