Genetically Modified Organisms (GMOs)

Genetically Modified Organism (GMO) refers to living organisms whose genetic material has been altered using modern biotechnology techniques in ways that cannot occur naturally. This process involves introducing new traits into an organism by transferring genes from another species or modifying its existing genetic structure. Organisms modified through this technology are also referred to in the literature as transgenic organisms, genetically engineered organisms, or bioengineered organisms.

The foundation of genetic technology lies in isolating a gene that codes for a desired trait from one organism and inserting it into the genome (genetic material) of another. These transferred genes are called "transgenes." GMO technology has application potential in many fields including agriculture, medicine, industry, and environmental management. However, alongside its potential benefits, this technology has also sparked scientific, ethical, and legal debates due to possible impacts on human health, the environment, biodiversity, and socio-economic structures.

Historical Development of GMOs

Genetic engineering technology gained momentum from the 1980s onward, evolving from a scientific research field into everyday application. The first genetic engineering experiments in plants began in 1982–1983, and the transition of this technology to agricultural use did not take long.

The entry of GMOs into commercial agriculture occurred in 1996 with the market launch of the FlavrSavr^【1】 tomato, which had an extended shelf life. This event is regarded as a milestone in the integration of GMO agricultural products into global trade. In the same year, commercial production began for genetically modified maize, soybean, cotton, and rapeseed, and the global area planted with GMO crops reached 1.7 million hectares.

In Türkiye, the process related to GMOs began in 1998 with field trials conducted with the permission of the Ministry of Agriculture and Rural Affairs. In 1999, pilot productions were carried out with potatoes in Niğde and with cotton and maize in Akçakale, Nazilli, and Adana.

Throughout the 2000s, the cultivation of GMO crops continued to increase rapidly worldwide. By 2004, the cultivated area reached 81 million hectares, by 2007 approximately 116 million hectares, and by 2010 it reached 148 million hectares.

GMO Technology and Application Areas

Genetic modification studies involve identifying, isolating, replicating, and transferring a gene that confers a desired trait to a target organism. Various methods have been developed for this transfer process:

• Gene Transfer in Plants: Techniques such as the gene gun ("shot-gun" method), the use of the bacterium Agrobacterium tumefaciens as a vector, and protoplast transformation are employed for gene transfer in plants.

• Gene Transfer in Animals: In animals, the leading methods include DNA microinjection, embryonic stem cell-mediated gene transfer, and the use of retroviruses as vectors.

The potential benefits and purposes of GMOs developed through these technologies span a wide range:

Agricultural Applications

Increased Yield and Resistance

GMO technology aims to make plants resistant to pests such as insects and viruses, as well as to chemicals such as herbicides. For example, by transferring a gene from the bacterium Bacillus thuringiensis (Bt) into maize and cotton, these crops have gained resistance to specific insect species. This is intended to reduce the use of agricultural pesticides. Additionally, developing crops more resistant to environmental stresses such as drought, salinity, and extreme heat is also a key objective.

Shelf Life and Quality

Another application area is extending the shelf life of fruits and vegetables by delaying ripening. The Flavr Savr tomato, developed by Calgene, is one of the first commercial products in this field. Similarly, improving organoleptic properties such as taste and aroma is also targeted.

Nutrition and Health

Enhanced Nutritional Value

GMO technology is used to enhance the nutritional value of foods. One of the best-known examples is "Golden Rice," which has been genetically modified to produce beta-carotene, a precursor of vitamin A. This product was developed as a solution to nutritional deficiencies in regions where rice is a staple food and vitamin A deficiency is widespread. Similarly, it is possible to increase the proportion of unsaturated fatty acids in vegetable oils or enrich proteins with essential amino acids.

Edible Vaccines and Pharmaceuticals

Plants can be genetically modified to produce antigens against various diseases and serve as platforms for "edible vaccines." Research continues on producing vaccines against diseases such as hepatitis, cholera, and rabies in plants such as bananas, potatoes, and tomatoes. This method is expected to reduce vaccine costs and simplify distribution. Additionally, some plants are used as "bioreactors" to produce pharmacological proteins such as insulin.

Organ Transplantation (Xenotransplantation)

Genetically modified animals hold potential as a source of organs for human transplantation. The goal is to remove genes in animals such as pigs that trigger rejection by the human immune system, thereby providing a solution for patients awaiting organ transplants.

Industrial and Environmental Applications

Enzyme and Additive Production

Food enzymes such as chymosin used in cheese production or various food additives can be produced more easily and at lower cost through genetically modified microorganisms.

Bioremediation

Some genetically modified plants and microorganisms are used to clean toxic waste and heavy metals from soil and water.

Debates and Potential Risks

The development and widespread adoption of GMOs have generated significant debates. These discussions focus on various dimensions including human and animal health, the environment, socio-economics, and ethics.

Health Risks

Allergic Reactions

Gene transfer can introduce new proteins into food, potentially triggering allergic reactions. The most concrete example is the transfer of a gene from Brazil nuts into soybeans, which caused allergic reactions in individuals sensitive to Brazil nuts. This product was withdrawn from the market after detection.

Toxicity

There is concern that the transferred gene itself or unintended changes in the plant's metabolism could produce toxic compounds.

Antibiotic Resistance Genes

During gene transfer, antibiotic resistance genes are sometimes used as "markers" to select successfully modified cells. This raises a theoretical risk that these genes could transfer via consumption to bacteria in the intestines of humans or animals, potentially spreading antibiotic resistance.

Environmental Risks

Gene Flow and "Superweeds"

Gene flow refers to the transfer of pollen from GMO plants to related wild species via wind or insects, resulting in hybridization. There is concern that if herbicide-resistance genes transfer to wild weeds, it could lead to the emergence of "superweeds" that are extremely difficult to control.

Impact on Biodiversity

The widespread cultivation of genetically uniform GMO crops can threaten genetic diversity by reducing local varieties and their associated wild species. This is considered a significant risk for countries like Türkiye, which are rich in genetic resources.

Effects on Non-Target Organisms

There are concerns that Bt crops, which produce toxins against pests, may also harm beneficial or harmless insect species such as butterflies. A laboratory study at Cornell University showed that pollen from Bt maize could harm monarch butterfly larvae, sparking widespread debate on this issue.

Socio-Economic and Ethical Issues

Patenting and Farmer Dependency

GMO seeds and associated genes are typically patented by large multinational corporations. This situation forces farmers to purchase seeds annually from these companies and eliminates the traditional practice of saving seeds from their own harvests.

Terminator Technology

This technology involves developing plants that produce sterile seeds after planting. It aims to prevent farmers from reusing patented seeds in subsequent years and has faced intense criticism for increasing farmers' dependency on seed companies.

Labeling

Labeling of GMO-containing products is one of the most contentious issues globally. Proponents emphasize consumers' right to information and choice, while opponents argue that labeling may create unfounded fears about the products and increase costs.

Religious and Cultural Concerns

Some religious and cultural groups oppose practices such as transferring animal genes into plants or pig genes into other organisms on ethical grounds.

Legal Status and Regulations

The production, trade, and consumption of GMOs are subject to different legal regulations worldwide.

International Level

The key international instrument regulating the transboundary movement of modern biotechnology products is the Cartagena Protocol on Biosafety. Entered into force in 2003 and signed by Türkiye, this protocol, based on the precautionary principle, allows countries to restrict or ban imports of GMOs even in the absence of scientific certainty regarding potential risks.

International Variations

Regulations regarding GMOs vary significantly from country to country. In the United States, the production of GMO products is widespread, and labeling is not mandatory unless there is a significant difference from their natural counterparts. In contrast, the European Union applies a strict authorization and monitoring system and requires mandatory labeling of all food and feed containing GMOs above a threshold of 0.9%.

Situation in Türkiye

In Türkiye, the legal framework for GMOs was established by the Biosafety Law No. 5977, which entered into force in 2010. This law prohibits the production of genetically modified plants and animals. The import, processing, and use of GMOs and their products require approval from the Biosafety Board under the Ministry of Food, Agriculture, and Livestock. The Board makes decisions based on risk assessments conducted through scientific committees. To date, only a few GMO soybean and maize varieties have been permitted for use in Türkiye, exclusively as animal feed and not for human consumption. The use of GMO products in sensitive items such as infant formula is completely prohibited.