regulatory procedure for the assessment of gm foods
TRANSCRIPT
Traditional Views of Food Safety
Historically, our beliefs about the safety of foods have been based almost entirely on tradition and cultural experience In practice, very few of the foods we eat today have been subject to any toxicological studies and yet they are genetically accepted as safeEven foods that contain toxins or anti-nutrients have been considered safe through a long history of use
What’s Changed?
Genetically modified (GM) foods Scrutinized by scientists, regulators and the public
Subject to unprecedented regulatory oversight
Have caused us to rethink our traditional views of food safety
Definition of “safe”
Approaches to systematically evaluating safety
FOOD SAFETY
FOOD SAFETY, involves all those hazards, whether chronic or acute, that
may make the food injurious to the health of consumers.
IT IS NOT NEGOTIABLE
(FAO 2003)
Can Safety be Proven?
It is impossible to prove that something is safe “Zero” risk and “Absolute” safety are impossible to achieve in the food system
GM Foods- Safety Review
Takes around 10-14 years: Laboratory research Contained greenhouse evaluation Contained small scale field trials Pre-commercial testing Commercial release
Key Initiatives
Codex Ad Hoc Intergovernmental Task Force on Foods Derived from Biotechnology
General Principles for the Risk Analysis of Foods Derived from Recombinant DNA Plants
Guidelines for the Conduct of Safety Assessment of Foods Derived from Recombinant DNA plants and Microorganisms
The Comparative Approach
Based on the principle that you can compare a GM food with a counterpart having a history of safe use
Comparison can include an evaluation of the same risk factors established for the counterpart
This approach is commonly referred to as the “Substantial Equivalence” approach
Goals of Substantial Equivalence
To structure the safety assessment relative to the counterpart food
To identify intended or unintended differences on which further safety assessment should focus
To determine “…as safe as…”
Substantial Equivalence
is not... A safety assessment in itself
A characterization of the hazard
An endpoint in the risk assessment process
Limitations of Substantial Equivalence
Availability of a counterpart
Availability of data on agronomic / compositional properties
Availability of data on natural variations
Availability of analytical methods
Codex Guidelines for Foods Derived from Recombinant DNA Microorganisms
The Safety assessment of a food produced using a recombinant DNA microorganism follows a stepwise process of addressing relevant factors, including: Description of the rDNA microorganism
Description of recipient microorganism and its use in food production
Description of donor organism
Description of the genetic modification(s) including vector and construct
Characterisation of the genetic modification(s)
Codex Guidelines for Foods Derived from Recombinant DNA Microorganisms
Safety assessment:
-Expressed substances: assessment of potential toxicity and other traits related to pathogenicity;
-Compositional analyses of key components;
-Evaluation of metabolites;
-Effects of food processing;
-Assessment of immunological effects; allergenicity
-Assessment of viability and residence of microorganisms in the human GI tract
-Anitibiotic resistance and gene transfer
-Nutritional modification
International Consensus
Even considering its limitations, the concept of substantial equivalence as a tool to help regulators structure the safety assessment process has been reaffirmed on numerous occasions internationally There are no alternative strategies that provide a better assurance of safety (WHO/FAO Joint Expert Consultation, 2000)
‘some form of substantial equivalence, starting with a direct comparison of the novel foodstuffs with their unmodified counterparts, appears to be the only practical solution’
The goal of each safety assessment is to
provide assurance, in the light of the best
available scientific knowledge that the food does
not cause harm when prepares, used and/or eaten
according to its intended use.
Questions that need to be answeredIs the transferred DNA safe to consume?
If an antibiotic resistance marker is used, is it safe?
Are the newly produced proteins safe to consume?
Have potential allergens been introduced into the food?
Are the composition and nutritional value changed?
Questions that need to be answered
Are there changes in the content of important substances?
In what forms will the food or food products isolated from it be consumed?
Do the newly introduced substances survive processing, shipment, storage and preparation?
What is the expected human dietary exposure?
BAFPS Framework on Food Safety Assessment of GM Foods
Sound scientific evidence Pursued in accordance with recognized risk
assessment guidelines and appropriate sampling techniques
Carried out in a transparent manner Evaluation shall consider the safety of its
conventional counterparts Shall take into account the history of safe use as
food source from the importing country
BAFPS Assessment of GM Foods
Focused on Horizontal Gene transfer Safe use of Antibiotic Resistance Marker Gene Nutritional Composition Possible allergenicity Unintended effects
Summary
Important components of GM regulation
Guidelines – risk assessment, management
Legislation – GM process, GM products
Periodic re-evaluation of Guidelines and implementation procedures give the applicants, reviewers, administrators, regulators and the public an opportunity to assess how well the system is working