How does recombinant DNA technology enable cells to make useful proteins?

Recombinant DNA technology enables cells to function as biological factories for protein production by introducing foreign genetic material into a host organism, typically bacteria.12

The process involves several key steps:

• Gene Isolation and Vector Insertion: Researchers isolate a specific gene and insert it into a vector, such as a plasmid, using restriction enzymes to cut the DNA and DNA ligase to seal the segments.3
• Transformation: The recombinant vector is introduced into host cells, such as bacteria, through a process called transformation.3
• Expression: Once inside, the host cell treats the foreign DNA as its own. Because the nucleotide sequence of DNA encodes instructions for protein synthesis, the cell transcribes and translates the inserted gene to produce the specified protein.2

To ensure successful production of eukaryotic proteins in bacteria, researchers often use cDNA and place it adjacent to bacterial promoter regions in expression libraries, bypassing issues like introns that bacteria cannot process. This technology is essential for manufacturing medical products like insulin and growth hormone.31