Animal Biotechnology: Myths, Lessons, and Possibilities
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- Charles Reed
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1 These handouts are provided for informational purposes only. The slides and images contained in this presentation may not be used without the prior permission of the presenter. Animal Biotechnology: Myths, Lessons, and Possibilities What is Animal Biotechnology? Assisted Reproductive Technologies Help distribute genetics beyond natural matings AI, semen sexing, in vitro fertilization, embryo transfer, embryo splitting 1300s-present 1
2 What is Animal Biotechnology? Cloning More rapid distribution of naturally occurring desirable traits in breeding stock 1990s-present Genetic Engineering Introduces/modifies genes not naturally occurring to introduce new traits 1980s-present ARTs in Animal Agriculture ARTs developed to improve reproductive efficiency Genetic Diversity No longer limited to nearby genetics ARTs in Animal Agriculture Practical/economic issues Mating is dangerous to males and females Keeping herds of bulls/boars is costly and can be dangerous Maximize distribution of genetics Better livestock increased profitability 2
3 Cloning via Somatic Cell Nuclear Transfer Definitions Somatic Cell Nuclear Transfer = the fusion of the nuclei (or entirety) of diploid donor cells with unfertilized, enucleated oöcytes. Clone = Animal resulting directly from SCNT (AC= Animal Clone) Definitions Clone Progeny = Any animal derived from sexual reproduction that has a clone as at least one parent. Specifically excludes clones of clones. 3
4 Expansion of Elite Breeding Stock (clones are for breeding, not eating) ARTs in the Breeding Pyramid Elite AI, ET, ES, SCNT Multiplier Production Herds AI AI/NM Food FDA Risk Assessment Food safety Animal health Weight of evidence evaluation 4
5 RA Conclusions: Risks to Animals Most adverse outcomes early in life No unique risks; Increased frequency LOS seen in cattle and sheep Surrogate dams Clones No apparent health risks after 50 days of age 5
6 RA Conclusions: Food Consumption Risks Clones: Food from cattle, swine, and goat clones that meet federal and state requirements is as safe as food from conventional animals that meets the same requirements As safe as food we eat every day RA Conclusions: Food Consumption Risks Clone Progeny: Food from clone offspring poses no additional risk compared with food from other animals As safe as food we eat every day Current Status Final release January 15, 2008 USG has no further scientific concerns USDA begins smooth and orderly market transition Legislative proposals Additional review Labeling International Efforts NZ EFSA Japan 6
7 Cloning Myths -1 Herds of Clones will Roam the Earth (or at least the US) Elite breeders; expense Cloning is a New Technology Not so; widely used in plants (bananas, potatoes, Grandma s geraniums) Clones Have a Specific Animal s DNA Grafted on to a Body Blank Oh, please 7
8 Cloning Myths-2 Can Cure Diseases in Animals No, but it can propagate diseaseresistant animals (see also GE animals) Weakens the Immune System No evidence for increased disease rate or adverse changes in immune cell types Cloning Myths-2 Offspring of clones are clones, and get weaker with each generation Sexually-reproduced offspring are NOT clones; they re animals (like any other) Lessons from Cloning It s just another tool in the toolbox Stakeholder alignment Regulatory alignment Asymmetrical international decisionmaking 8
9 Cloning Possibilities Rapid deployment of desirable traits Rescue genetics of non-viable animals Rescue rare genetics Research tool for reproduction Tool for propagating GE animals What About GE Animals? Why are we doing this? Can t regular breeding accomplish the same thing? Possibly: -Production traits -Disease resistance Not likely: -Pharma animals -Xenotransplants -Unique production traits GE Animals: Definitions Genetic Engineering: introduction of new genes via rdna technology. New genes usually found on an rdna construct. Constructs may be heritable or non-heritable (e.g., gene therapy) 9
10 GE Animals: Definitions GE Animal: Animal produced via genetic engineering (contrast w Genetically Modified Organism: one modified via breeding, not limited to genetic engineering) Why GE Animals? Allows for introduction of traits NOT possible via conventional breeding Alternative to antibiotics and steroid hormones in feed, implants, etc. Agricultural and medical applications in many species Production matrix is known and safe 10
11 GE Animal:Products (1) Enhanced Food Quality/Agronomic Traits/Environmental Benefits Cows Producing Milk with Long Shelf Life/Digestibility Growth Enhanced Atlantic Salmon Enviropig Omega-3 Fatty Acid Pork Milk for Cheese Making GE Animal:Products (1) Animal Health Mastitis-Resistant Dairy Cows BSE-Resistant Cattle Other disease resistance Fish consumption Current annual US fish consumption: 15 lbs/person To meet 2025 projected fish consumption 1 Billion lb deficit Growth enhanced fish can help meet the demand Faster growth Smaller environmental footprint Decrease stress on wild populations 11
12 Growth Hormone-Enhanced Atlantic Salmon These salmon are the same age, yet one grew spectacularly, thanks to a gene transplant Enviropig Environmental Issue Problem Most plant-derived phosphate not bioavailable Supplementation required Phosphates excreted in manure; run-off 12
13 Environmental Issue Enviropig as part of solution Pig produces enzymes in saliva to make plant phosphorus bioavailable No need for supplementation; excretion~intake; less phosphate in manure GE Animal:Products (2) Products for Human Therapeutic Use Chickens/Cattle/Goats for pharmaceutical production Swine as Xenotransplantation Sources Cattle/Goats producing anti-biowarfare agents GE Animal:Products (2) Mixed-Use High-Value Products Goats producing spider silk Cows producing highly specific antibody:functional molecule products 13
14 BioPharming Manufacturing capacity shortage Biological similarities make animals excellent choice as bioreactors Non-toxic matrix Cheaper, less disease risk than isolating products from human cadavers Significant experience with vaccine development GE Animals Making Antibodies to Biowarfare Agents (Hematech) Need for large-scale reliable sources of therapeutic agents for biowarfare agents (e.g., anthrax, viruses) Cattle as excellent sources of polyclonal antibodies Introduce human antibody genes, remove bovine antibody genes Plasmaphoresis to isolate GE Animal: Chemical Defense Agents (Pharmathene) Organophorphorus agents (modern nerve gas) block acetylcholinesterase GE Goats produce human butylcholinesterase, pretreatment to guard against acute effects, or posttreatment to protect against long-term effects 14
15 Spider-Silk Goats (UWyoming) Orb-spinning spider silk remarkably strong, flexible Difficult to produce artificially Can be produced in milk of GE goats Uses: Personal protection (Kevlar-type vests) Parachutes Medical sutures GE Animals: (3) Companion Animals Hypoallergenic cat GloFish Where is the Technology Today? Most early in development, and growing Proof of concept growing rapidly Some in regulatory review process One in commercial sales (GloFish) Most tech providers small, entrepreneurial, VC-driven operations Public reaction likely wary 15
16 Animal Biotech Challenges Need formalized regulatory program Need reliable funding sources Products with clear benefits Realistic communications; no overpromising Public acceptance Implications for Biosecurity Clones + Rapid introduction of disease-resistant animals + Ability to rescue valuable genetics if attack - Improper use limits diversity Implications for Biosecurity GE Animals + Reliable, high volume sources of means to combat biological or chemical agents + Rapid replenishment of food sources - No products yet available 16
17 Thanks for your attention! 17
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