What Are GMOs? A Comprehensive Introduction

What Are GMOs?

Genetically modified organisms (GMOs) are living things — plants, animals, or microorganisms — whose genetic material (DNA) has been altered in a way that does not occur naturally through mating or natural recombination.

How Are GMOs Created?

Scientists use several techniques to create GMOs:

Recombinant DNA Technology: Genes from one organism are inserted into another organism's genome. For example, the Bt gene from *Bacillus thuringiensis* bacteria has been inserted into corn to make it resistant to certain insects.

CRISPR-Cas9: A newer, more precise gene-editing tool that allows scientists to add, remove, or alter genetic material at specific locations in the genome.

Agrobacterium-mediated transformation: A naturally occurring soil bacterium is used to transfer genes into plant cells.

A Brief History

• 1973: First recombinant DNA organisms created by Herbert Boyer and Stanley Cohen
• 1982: First GMO insulin approved for human use (Humulin)
• 1994: First GMO food crop approved for sale (Flavr Savr tomato)
• 1996: Commercial GMO crop cultivation begins widely
• 2012: CRISPR-Cas9 developed as a gene-editing tool
• 2020s: New generation of GMO crops with enhanced nutritional profiles

Common GMO Crops

Today, the most widely grown GMO crops include soybeans, corn (maize), cotton, canola, sugar beets, alfalfa, papaya, squash, and potatoes. These crops are engineered for traits such as herbicide tolerance, insect resistance, disease resistance, and improved nutritional content.

Scientific Consensus

The overwhelming scientific consensus, supported by organizations including the World Health Organization (WHO), the National Academies of Sciences, Engineering, and Medicine (NAS), and the European Food Safety Authority (EFSA), is that currently approved GMO foods are safe for human consumption.