July 27, 2017 Which is more disruptive to a plant: genetic engineering or conventional breeding?
It often surprises people to learn that GE commonly causes less disruption to plants than conventional techniques of breeding. But equally profound is the realization that the latest GE techniques, coupled with a rapidly expanding ability to analyze massive amounts of genetic material, allow us to make super-modest changes in crop plant genes that will enable farmers to produce more food with fewer adverse environmental impacts. Such super-modest changes are possible with CRISPR-based genome editing, a powerful set of new genetic tools that is leading a revolution in biology.
My interest in GE crops stems from my desire to provide more effective and sustainable plant disease control for farmers worldwide. Diseases often destroy 10 to 15 percent of potential crop production, resulting in global losses of billions of dollars annually. The risk of disease-related losses provides an incentive to farmers to use disease-control products such as pesticides. One of my strongest areas of expertise is in the use of pesticides for disease control. Pesticides certainly can be useful in farming systems worldwide, but they have significant downsides from a sustainability perspective. Used improperly, they can contaminate foods. They can pose a risk to farm workers. And they must be manufactured, shipped and applied all processes with a measurable environmental footprint. Therefore, I am always seeking to reduce pesticide use by offering farmers more sustainable approaches to disease management.
What follows are examples of how minimal GE changes can be applied to make farming more environmentally friendly by protecting crops from disease. They represent just a small sampling of the broad landscape of opportunities for enhancing food security and agricultural sustainability that innovations in molecular biology offer today.
Genetically altering crops the way these examples demonstrate creates no cause for concern for plants or people. Mutations occur naturally every time a plant makes a seed; in fact, they are the very foundation of evolution. All of the food we eat has all kinds of mutations, and eating plants with mutations does not cause mutations in us.
Knocking Out Susceptibility
A striking example of how a tiny genetic change can make a big difference to plant health is the strategy of knocking out a plant gene that microorganisms can benefit from. Invading microorganisms sometimes hijack certain plant molecules to help themselves infect the plant. A gene that produces such a plant molecule is known as a susceptibility gene.
We can use CRISPR-based genome editing to create a targeted mutation in a susceptibility gene. A change of as little as a single nucleotide in the plants genetic material the smallest genetic change possible can confer disease resistance in a way that is absolutely indistinguishable from natural mutations that can happen spontaneously. Yet if the target gene and mutation site are carefully selected, a one-nucleotide mutation may be enough to achieve an important outcome.
There is a substantial body of research showing proof-of-concept that a knockout of a susceptibility gene can increase resistance in plants to a very wide variety of disease-causing microorganisms. An example that caught my attention pertained to powdery mildew of wheat, because fungicides (pesticides that control fungi) are commonly used against this disease. While this particular genetic knockout is not yet commercialized, I personally would rather eat wheat products from varieties that control disease through genetics than from crops treated with fungicides.
The Power of Viral Snippets
Plant viruses are often difficult to control in susceptible crop varieties. Conventional breeding can help make plants resistant to viruses, but sometimes it is not successful.
Early approaches to engineering virus resistance in plants involved inserting a gene from the virus into the plants genetic material. For example, plant-infecting viruses are surrounded by a protective layer of protein, called the coat protein. The gene for the coat protein of a virus called papaya ring spot virus was inserted into papaya. Through a process called RNAi, this empowers the plant to inactivate the virus when it invades. GE papaya has been a spectacular success, in large part saving the Hawaiian papaya industry.
Aerial view of a field trial showing virus-resistant papaya growing well while the surrounding susceptible papaya is severely damaged by the virus. Reproduced with permission from Gonsalves, D., et al. 2004. Transgenic virus-resistant papaya: From hope to reality in controlling papaya ringspot virus in Hawaii. APSnet Features. Online. DOI: 10.1094/APSnetFeature-2004-0704
Through time, researchers discovered that even just a very small fragment from one viral gene can stimulate RNAi-based resistance if precisely placed within a specific location in the plants DNA. Even better, they found we can stack resistance genes engineered with extremely modest changes in order to create a plant highly resistant to multiple viruses. This is important because, in the field, crops are often exposed to infection by several viruses.
Does eating this tiny bit of a viral gene sequence concern me? Absolutely not, for many reasons, including:
Tweaking Sentry Molecules
Microorganisms can often overcome plants biochemical defenses by producing molecules called effectors that interfere with those defenses. Plants respond by evolving proteins to recognize and disable these effector molecules. These recognition proteins are called R proteins (R standing for resistance). Their job is to recognize the invading effector molecule and trigger additional defenses. A third interesting approach, then, to help plants resist an invading microorganism is to engineer an R protein so that it recognizes effector molecules other than the one it evolved to detect. We can then use CRISPR to supply a plant with the very small amount of DNA needed to empower it to make this protein.
This approach, like susceptibility knockouts, is quite feasible, based on published research. Commercial implementation will require some willing private- or public-sector entity to do the development work and to face the very substantial and costly challenges of the regulatory process.
Engineered for Sustainability
The three examples here show that extremely modest engineered changes in plant genetics can result in very important benefits. All three examples involve engineered changes that trigger the natural defenses of the plant. No novel defense mechanisms were introduced in these research projects, a fact that may appeal to some consumers. The wise use of the advanced GE methods illustrated here, as well as others described elsewhere, has the potential to increase the sustainability of our food production systems, particularly given the well-established safety of GE crops and their products for consumption.
Originally posted here:
When genetic engineering is the environmentally friendly choice - Ensia
- Main Show Only - Genetic Engineering - Coast to Coast AM - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- RTPB | Genetic Engineering [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Stop Monsanto From Poisoning Hawai'i: Genetic Engineering Chemical Warfare - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Informatics 161 PSA: Human Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Don't Trust Whole Foods or Other Health Food Stores For Non- GMO Foods | Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Easier Genetic Engineering! (Brainstorm Ep69) - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- TEDxUCIrvine - Francisco Ayala - Cloning, Genetic Engineering, [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Genetic Engineering in Agriculture - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Infowars Special Report : Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Glowing Rats and Extreme Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Endangered Cat Born at Audubon - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Danger of Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- AQA GCSE core science and B1 - Genetic Engineering - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- genetic engineering rDNA.wmv - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Genetic Engineering for Human Enhancement.mp4 - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Genetic Engineering - Seven Wonders of the Microbe World (6/7) - Video [Last Updated On: September 7th, 2012] [Originally Added On: September 7th, 2012]
- Promising new drug target for inflammatory lung diseases [Last Updated On: September 8th, 2012] [Originally Added On: September 8th, 2012]
- Mandatory GM Labeling Would Require Major Change [Last Updated On: September 10th, 2012] [Originally Added On: September 10th, 2012]
- GEN reports on ocular therapeutics targeting the retina [Last Updated On: September 11th, 2012] [Originally Added On: September 11th, 2012]
- Prop. 37: Another example of the perils of the initiative process [Last Updated On: September 15th, 2012] [Originally Added On: September 15th, 2012]
- Genetic test predicts risk for Autism [Last Updated On: September 19th, 2012] [Originally Added On: September 19th, 2012]
- Immediate withdrawal of unsafe GE corn vital - Greens [Last Updated On: September 20th, 2012] [Originally Added On: September 20th, 2012]
- Immediate withdrawal of unsafe GE corn vital [Last Updated On: September 20th, 2012] [Originally Added On: September 20th, 2012]
- NZ out of step on GE [Last Updated On: September 21st, 2012] [Originally Added On: September 21st, 2012]
- Ballot Watch: Labeling genetically engineered foods [Last Updated On: September 30th, 2012] [Originally Added On: September 30th, 2012]
- Just another GE mirage [Last Updated On: October 2nd, 2012] [Originally Added On: October 2nd, 2012]
- The GM Barnyard [Last Updated On: October 3rd, 2012] [Originally Added On: October 3rd, 2012]
- Free Engine [Last Updated On: October 3rd, 2012] [Originally Added On: October 3rd, 2012]
- Cellectis Publishes Results Paving the Way for New Therapeutic Approaches against Cancer and Genetic Diseases [Last Updated On: October 3rd, 2012] [Originally Added On: October 3rd, 2012]
- Does moral decision-making in video games mirror the real world? [Last Updated On: October 3rd, 2012] [Originally Added On: October 3rd, 2012]
- Animals engineered with pinpoint accuracy [Last Updated On: October 3rd, 2012] [Originally Added On: October 3rd, 2012]
- Valley farmers fear 'modified' wording in Prop. 37 [Last Updated On: October 4th, 2012] [Originally Added On: October 4th, 2012]
- No on Proposition 37 [Last Updated On: October 4th, 2012] [Originally Added On: October 4th, 2012]
- The Dangers of Genetic Engineering [Last Updated On: October 5th, 2012] [Originally Added On: October 5th, 2012]
- Are inhaled medications effective and safe in critically ill patients on mechanical ventilation? [Last Updated On: October 5th, 2012] [Originally Added On: October 5th, 2012]
- Calif. initiative will test appetite for GMO food [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- Calif. initiative will test appetite for GMO food - Sat, 06 Oct 2012 PST [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- California to vote on 'genetically modified' labels [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- California initiative will test appetite for genetically modified foods [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- Do we have an appetite for genetically modified food? [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- Genetic labelling mooted in California [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- California initiative to test appetite for 'genetically engineered' food [Last Updated On: October 7th, 2012] [Originally Added On: October 7th, 2012]
- New tool for making genetic engineering of microbial circuits reliably predictable [Last Updated On: October 10th, 2012] [Originally Added On: October 10th, 2012]
- Researchers develop new tool for making genetic engineering of microbial circuits reliably predictable [Last Updated On: October 10th, 2012] [Originally Added On: October 10th, 2012]
- A Welcome Predictability [Last Updated On: October 10th, 2012] [Originally Added On: October 10th, 2012]
- Engineered flies spill secret of seizures [Last Updated On: October 12th, 2012] [Originally Added On: October 12th, 2012]
- Genetic 'remix' key to evolution of bee behavior, researchers find [Last Updated On: October 15th, 2012] [Originally Added On: October 15th, 2012]
- Can vaccines be delivered via the lungs instead of by injection? [Last Updated On: October 15th, 2012] [Originally Added On: October 15th, 2012]
- Food labeling regulations [Last Updated On: October 16th, 2012] [Originally Added On: October 16th, 2012]
- Research and Markets: Therapeutic Antibody Engineering: Current and Future Advances Driving the Strongest Growth Area ... [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- Is there a difference between GE & GMO? [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- Port Townsend Food Coop: A Sad Story of GMO Crop Cross Pollination - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- PUT IT IN YOUR MOUTH! Yes to Prop 37 — it's your right to know what's in your food! - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- editta braun company: planet LUVOS (clip, 4:30) - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- Mimic: The Director's Cut (Blu-ray Trailer) - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- South Park Season 1 Episode 7 - An Elephant Makes Love to a Pig - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- Yes on Prop 37: Animated Video - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- The Day of the Triffids Part 1 Full Movie - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- YES on prop 37 "flashmob" march - Santa Cruz, CA Sept. 2012 - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- World's Weirdest Places Discussed - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- THE CLUB OF ROME - DEPOPULATION AGENDA 21 - THE UNHIVED MIND - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- 27-Medical BiotechnologySG Part II.Gene Therapy, Tissue Engineering and Nanotechnology.mov - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- 26-Medical BiotechnologySG Part Ic. Animal and Human Cloning and Genetic Engineering.mov - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- How to Clone Animals - Video [Last Updated On: November 2nd, 2012] [Originally Added On: November 2nd, 2012]
- Fringe Opening sequence (Season 3 - The Day We Died) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 3 - Olivia) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 3 - Entrada) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 4) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 3) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 2) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (1985) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Dendritic Cells: Biology And Clinical Applications - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Port Townsend Food Coop: "I want my food untainted by GMOs" - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Catholic Priest vs. Biologist - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Watch Real Life Superhero Muscles Like Marvel's The Avengers - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (Season 1) - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Fringe Opening sequence (The Final Season: "Fight For The Future") - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- Port Townsend Food Coop: I Want To Know If GMOs Are In My Food - Video [Last Updated On: November 4th, 2012] [Originally Added On: November 4th, 2012]
- ProCognia jumps on expanded biosimilar collaboration [Last Updated On: November 7th, 2012] [Originally Added On: November 7th, 2012]