Insertion of a rabbit beta-globin gene sequence into an E. coli plasmid

Area of Science:

• Molecular Biology
• Recombinant DNA Technology
• Gene Cloning

Background:

• Messenger RNA (mRNA) serves as a template for protein synthesis.
• Synthesizing complementary DNA (cDNA) from mRNA allows for gene manipulation and cloning.
• Bacterial plasmids are commonly used vectors for gene cloning.

Purpose of the Study:

• To clone the rabbit beta-globin gene sequence.
• To create a recombinant DNA molecule for studying gene expression.
• To develop a method for inserting eukaryotic DNA into bacterial plasmids.

Main Methods:

• In vitro synthesis of double-stranded DNA from rabbit globin mRNA.
• Elongation of DNA with homopolymeric deoxyguanosine (dG) tails.
• Preparation of an Escherichia coli plasmid by cleavage with EcoRI, followed by addition of deoxycytidine (dC) tails.
• Annealing of globin DNA with the prepared plasmid to form a hybrid DNA molecule.
• Transformation of E. coli with the hybrid DNA and selection of a clone (pCR1-betaG1).
• Hybridization experiments using radioactive globin cDNA to confirm the presence of the globin sequence.
• Analysis of the recombinant plasmid's circular DNA for EcoRI sensitivity.

Main Results:

• A recombinant plasmid, designated pCR1-betaG1, was successfully constructed and introduced into E. coli.
• Hybridization experiments confirmed that pCR1-betaG1 contains a DNA sequence corresponding to part of the rabbit beta-globin gene.
• The purified recombinant plasmid DNA demonstrated sensitivity to EcoRI digestion, indicating the successful reconstitution of EcoRI sites.

Conclusions:

• The study successfully cloned a portion of the rabbit beta-globin gene into an E. coli plasmid.
• The developed method allows for the efficient insertion of eukaryotic DNA into bacterial plasmids.
• The recombinant plasmid pCR1-betaG1 serves as a valuable tool for further molecular studies of the beta-globin gene.