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🫁What Are Transgenic Animals and Why Are Scientists Creating Them?




✍🏻Have you ever wondered what happens when humans take control of animal genetics? What if we could design animals to produce human medicines, mimic human diseases, or even replace costly vaccine trials on monkeys?
Welcome to the world of transgenic animals — creatures whose DNA has been altered to express foreign genes… and they’re changing science, medicine, and biotechnology as we know it.
Let’s explore this fascinating topic in depth.


What Are Transgenic Animals?

So, what exactly are transgenic animals?
These are animals whose DNA has been intentionally manipulated, meaning an extra gene from another organism is inserted into their genome.
This added gene—called a foreign gene or transgene—gets expressed in the animal’s body, affecting how it functions.

Over the years, scientists have successfully created transgenic mice, rabbits, pigs, sheep, cows, and even fish. But here’s something interesting—over 95% of all transgenic animals in labs today are mice, because of their fast breeding and genetic similarity to humans.

But why do we make these animals in the first place?
Let’s understand the key reasons.


Studying Normal Physiology & Development –

To understand how our bodies grow and function, scientists use transgenic animals.
For example, a gene responsible for insulin-like growth factor IGF can be inserted into a mouse. By observing how this affects the mouse's growth, researchers learn how IGF works in humans too.

This helps scientists study gene regulation, development processes, and internal bodily functions—without experimenting directly on humans.


Understanding Human Diseases –

Want to know how diseases like Alzheimer’s, cancer, or cystic fibrosis develop? Transgenic animals help us here too.

By inserting disease-causing human genes into animals like mice, we create animal models that mirror human illnesses.
These animals become tools for studying disease progression and testing new drugs.
For example, Alzheimer’s genes inserted in mice help scientists test treatments before trying them on humans.


Producing Biological Medicines –

Some human diseases require complex biological medicines, like proteins or enzymes, which are hard and expensive to produce.
That’s where transgenic animals come in.

By inserting a human gene into a cow, goat, or sheep, scientists can make the animal’s milk produce specific human proteins.
A famous example?
In 1997, a transgenic cow named Rosie was created. She produced milk rich in human alpha-lactalbumin, a protein that makes her milk more nutritionally balanced for infants than normal cow’s milk.

Another example includes human alpha-1-antitrypsin, produced to treat emphysema, a serious lung disease.


Vaccine Safety Testing –

Before any vaccine is given to humans, it must be tested for safety. Traditionally, monkeys were used for this, but transgenic animals are changing that.

For instance, transgenic mice are being developed to test the polio vaccine.
If found reliable, these mice could replace primates in labs—making vaccine testing faster, cheaper, and more ethical.


Chemical Safety & Toxicity

Ever wondered how we test if a new chemical or drug is toxic?
This is called toxicity testing, and transgenic animals are proving to be game-changers here too.

Scientists engineer animals with sensitive genes that react more strongly to toxic substances. These reactions give early warning signs of harmful chemicals, and testing can be done much quicker than with regular animals.


From advancing disease research to producing life-saving medicines and testing chemicals safely, transgenic animals are at the cutting edge of modern science.
But as powerful as this technology is, it also brings ethical questions—like animal welfare, environmental risks, and long-term genetic impacts.

Still, if used responsibly, these genetically engineered creatures could shape the future of medicine, agriculture, and biotechnology in unimaginable ways.




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⚠️ This video is entirely AI-generated for educational purposes. Both the visuals and the voiceover have been created using artificial intelligence. No real human voice or footage has been used. Content is produced by Knowledge Chronicle for informative and learning purposes only. 📚