Gel Electrophoresis

 “From Gel to Genius: Making Sense of Electrophoresis for Beginners”

Introduction:
Electrophoresis lets us make the invisible, visible—separating molecules based on size and charge.

Gel electrophoresis is a method used to separate biological molecules (like DNA, RNA, or proteins) based on size and charge. A sample is loaded into a gel matrix, and when an electric current is applied, molecules migrate through the gel.

🔹 What Is It, Really?

Imagine pouring jelly into a tray. This gel (often agarose or polyacrylamide) acts like a molecular sieve. DNA samples are loaded into small wells, and when an electric field is applied, negatively charged DNA fragments migrate toward the positive electrode.

Key Points:

  • Smaller fragments move faster
  • Larger ones lag behind
  • Fragments form distinct bands, which are then visualized (e.g., using ethidium bromide or SYBR Green and UV light)

🔹 Types of Electrophoresis

  • Agarose Gel Electrophoresis: Used mainly for nucleic acids
  • SDS-PAGE: Separates proteins by mass
  • Capillary Electrophoresis: High resolution, used in sequencing

  • Applications:

    • DNA fingerprinting in forensic labs
    • Checking PCR results
    • Analyzing restriction enzyme digests
    • Verifying plasmid constructs in genetic engineering

    Fun Fact: A single band shift can tell you if a mutation exists in a gene!


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