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CFIA Science Fact Sheet: Using genomics tools for day-to-day applications

What is genomics?

Genomics is the science that decodes genetic information in an organism's DNA. It enables the study of how genes function and interact with each other, and how they influence the growth and development of an organism. Genomics is sometimes confused with genetics, which is the study of individual genes and how organisms inherit genetic traits, for example, why somebody has brown eyes and another has blue.

Genomics helps us to understand, interpret, and use DNA to solve real-world challenges. These challenges are wide-ranging, such as finding solutions to meet food and energy demands, climate change, and long-term health issues. What scientists learn from genomics has the potential to improve the quality of life for people in Canada and around the world.

How the CFIA uses genomics

Researchers at the CFIA use genomics to develop new methods and tools to help improve how we develop policies and programs and enforce regulations. Genomics can also provide the scientific evidence that the CFIA needs to protect the health, safety and well-being of Canada's plants, animals, food and economy.

Examples of how the CFIA uses genomics:

The CFIA uses this DNA barcode to:

Picture - DNA barcode. Description follows.
Description for DNA barcode

The CFIA uses this DNA barcode to:

  • track outbreaks of food-borne illness
    • By analyzing the bacteria that cause foodborne illnesses down to the DNA level, investigators can narrow down specific strains of bacteria to specific locations or causes of contamination. The technology is similar to how a detective can link a fingerprint to a specific culprit at a crime scene.
  • combat invasive species quickly and accurately
    • Some insects can be harmless or even beneficial to their natural environment, while some invasive species can destroy ecosystems. For example, the Canadian Forestry Service estimates that removing and replacing trees affected by the emerald ash borer could cost up to $2 billion in Canada over 30 years. Bug experts, known as entomologists, can spend 20 years to develop the expertise to identify an insect visually. Using DNA technology means people trained in how to use the tool can simply and quickly identify an insect that might look nearly identical to several other species.
  • identify fake food products
    • Once meat or fish has been processed, it can be almost impossible to visually identify what animal it is. DNA barcoding allows inspectors to take a tiny sample of a product and not only confirm what the label says, but whether other unlisted ingredients have been mixed in, for example what meats are in a sausage.

Genomes and DNA barcodes

whole genome sequencing
The CFIA uses a process known as whole genome sequencing (WGS) to identify an organism's entire genome. A short piece of it can be used to identify a species whenever its DNA is found. That short piece of the genome acts like a barcode – whenever scientists see that piece of DNA, they know without a doubt what species they're dealing with.

Creating a DNA barcode

Having a tool that can quickly and accurately identify an organism is a huge time saver for scientists trying to solve complex problems. A process known as whole genome sequencing identifies the complete DNA sequence of an organism at a single time. To do this, scientists collect a DNA sample and then analyze it to identify billions of nucleotides, the basic structures that compose the DNA of an organism's genome.

Almost any biological sample that contains a full copy of DNA–even a very small amount–can provide the genetic material necessary for whole genome sequencing. These samples can be skin cells, seeds, plant leaves, or anything else that has DNA-containing cells.

How we create a DNA barcode:

Picture - How we create a DNA barcode. Description follows.
Description for how we create a DNA barcode

How we create a DNA barcode:

  • Extract DNA
  • Find out how much DNA is available
  • Make copies of the DNA so that there is enough to analyze
  • Prepare the DNA to be sequenced
  • Sequence the DNA
  • Analyze and validate the sequence
  • Maintain the sequence record for future reference

Tools of the trade

While a DNA barcode makes solving problems simpler, identifying one is a complex process. There are many steps that each require specialized equipment and techniques to get the job done. Once researchers have collected tissue that contains DNA, they are careful to handle it in a way to keep the sample sterile.

DNA barcodes can be kept in a database for future reference. The database also allows the DNA sequencing results from multiple projects to be merged and easily compared.

CFIA scientists organize the DNA barcodes they obtain using the Barcode of Life database. The database is part of the International Barcode of Life project (iBOL), which is the largest biodiversity genomics initiative ever undertaken. Hundreds of biodiversity scientists and genomics specialists from 25 countries are working together to build a comprehensive DNA barcode library. This library will be used to create a system to identify all living things by their DNA.

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