Jumping Genes

News: Polar bears in southern Greenland are ‘using jumping genes to rapidly rewrite their own DNA’ to survive melting sea ice.

About Jumping Genes

• Jumping genes are segments of DNA that can move from one position to another within the genome.
  • They are scientifically known as transposable elements. 
• They are called jumping genes because they can change their location in the DNA sequence.
  • This movement can affect how genes function.
• Discovery of Jumping Genes: Jumping genes were discovered by Barbara McClintock while studying maize plants.
• Types of Jumping Genes: There are two main types of jumping genes called DNA transposons and retrotransposons.
  • Each type moves in a different way within the genome.
• Mechanism
  • DNA transposons move by cutting themselves out of one location and inserting into another location in the DNA.
    • This process is known as the cut-and-paste mechanism.
  • Retrotransposons move by making a copy of themselves through an RNA intermediate.
  • The original remains in place while the copy inserts into a new position.
• How Jumping Genes Move: Jumping genes move with the help of special enzymes that allow them to cut, copy, or insert DNA.
  • These enzymes make the movement possible inside the genome
• Regulation of Jumping Genes: Cells control jumping genes using mechanisms such as DNA methylation and RNA-based silencing.
  • These controls help maintain genome stability.
• Presence in Living Organisms: Jumping genes are found in almost all living organisms, including plants, animals, and humans.
• Applications 
  • In genetic engineering, transposons are used to introduce desired genes into plants, animals, or cells for research. 
  • They are also being studied for gene therapy, where they may help deliver healthy genes to treat genetic disorders, such as through the Sleeping Beauty transposon system.
  • In addition, jumping genes are used in insertional mutagenesis to disrupt genes and study their functions.
• Effect on Genes: Jumping genes can disrupt normal genes when they insert themselves into important regions of DNA.
  • This disruption can change gene activity or stop gene function.
• Role in Genetic Diversity: Jumping genes increase genetic diversity by creating changes in the DNA sequence.
  • These changes help populations adapt to changing environments.
• Issues with Jumping Genes: Jumping genes can cause harmful mutations that lead to genetic disorders or diseases.