What is the Difference Between Linker and Adaptor?

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Linkers and adaptors are chemically synthesized oligonucleotides used in DNA ligation and recombinant DNA technology. They both have internal restriction sites but differ in their structure and function. The main differences between linkers and adaptors are:

  1. Structure: Linkers are double-stranded oligonucleotides with two blunt ends, while adaptors have one blunt end and one sticky end.
  2. Function: Linkers are used to ligate blunt ends of a vector and foreign DNA, containing restriction sites for the identification of restriction enzymes. Adaptors, on the other hand, are used for the ligation of DNA fragments with one sticky and one blunt end. Adaptors can also form dimers, while linkers do not.

In summary, linkers and adaptors are both used in DNA ligation, but they have distinct structures and functions. Linkers have two blunt ends and are used to ligate blunt ends of a vector and foreign DNA, while adaptors have one blunt end and one sticky end and are used for the ligation of DNA fragments.

Comparative Table: Linker vs Adaptor

Here is a table summarizing the differences between linkers and adaptors:

Feature Linker Adaptor
Description Linkers are chemically synthesized oligonucleotides with two blunt ends. Adaptors are chemically synthesized oligonucleotides with one sticky end and one blunt end.
Structure No single-stranded tail is present. A single-stranded tail is present at the sticky end.
Disadvantage The DNA fragment might already have a restriction site, limiting the use of linker molecules. The adaptor molecules tend to join and make dimers.
Uses Linkers are used to modify or manipulate DNA or RNA molecules, often by introducing specific sequences or features. Adaptors are primarily used as connectors, allowing the joining of different DNA or RNA molecules or fragments.

Both linkers and adaptors are double-stranded short oligonucleotide sequences that carry internal restriction sites and are chemically synthesized DNA molecules. They are used in recombinant DNA technology and DNA cloning.