Overview
This lecture reviews 10 significant achievements in genetic engineering, highlighting breakthroughs in agriculture, animal cloning, disease prevention, and food science.
Introduction to Genetic Engineering
- Genetic engineering allows modification, isolation, or replication of DNA in living organisms.
- The goal is to improve life in various fields through scientific innovation.
Engineered Fruits and Foods
- The melon, also called cocomelon, is a fruit combining traits of watermelon, cucumber, and lime, created through genetic engineering.
- Lemato is a hybrid between lemon and tomato, with additional genetic traits from rose, lemongrass, and carrot.
- Pink pineapple is genetically modified to suppress yellow pigment, revealing a natural pink color from lycopene; it is safe and nutritious.
- Modern bananas were genetically modified to be edible and seedless, unlike the wild, inedible originals.
- Golden rice is genetically engineered to contain beta-carotene, providing vitamin A to prevent deficiencies in developing countries.
Animal Cloning and Modification
- The first cloned dog, Snoopy, was created in South Korea using genes from an Afghan dog and an empty egg cell.
- Dolly the sheep was the first mammal cloned from an adult cell, marking a milestone in reproductive cloning.
- South Korean scientists cloned a glowing cat by inserting jellyfish genes, which may help with preserving rare species.
Bacterial Engineering for Medicine
- Salmonella bacteria have been engineered to target and destroy brain tumors, turning a harmful microbe into a cancer treatment.
Genetic Engineering Against Disease
- Chinese researchers edited twin babies' DNA to make them resistant to HIV/AIDS by modifying CCR5 cells during embryonic development.
Key Terms & Definitions
- Genetic Engineering — manipulation of an organism’s DNA for desired traits.
- Cloning — producing a genetically identical copy of an organism.
- Beta-carotene — an orange pigment, precursor to vitamin A.
- Lycopene — a red pigment found in certain fruits, such as tomatoes.
- Endosperm — the nutrient-rich tissue in seeds like rice.
- Transgenic — an organism containing genes from another species.
- CCR5 — a gene encoding a protein that allows HIV entry into cells.
Action Items / Next Steps
- Review examples of genetic engineering in food and medicine.
- Prepare to discuss ethical implications of genetic engineering and cloning in class.