Locus-specific vector/primer systems for rapid cloning of allelic variants

Area of Science:

• Molecular Biology
• Genetics
• Biotechnology

Background:

• Traditional cDNA cloning methods can be time-consuming and involve multiple purification steps.
• The need for efficient methods to clone and sequence polymorphic genetic variants is crucial in areas like human genetics and immunology.

Purpose of the Study:

• To develop a rapid and simplified cDNA cloning procedure.
• To create a single-tube protocol for cloning and sequencing allelic variants of polymorphic loci.
• To demonstrate the utility of locus-specific single-stranded (ss) vector/primers.

Main Methods:

• Development of single-stranded (ss) vector/primers by replacing the polylinker of M13mp19 with locus-specific oligodeoxynucleotide sequences.
• Linearization of the ss vector/primer to prime cDNA synthesis.
• Direct transformation of competent bacterial hosts with recircularized DNA without intermediate purifications.

Main Results:

• A rapid, single-tube cDNA cloning protocol was successfully established.
• The method eliminates the need for intermediate column purifications or extractions.
• The developed vector/primers are specific for HLA-DQ beta genes and human Ig variable regions associated with IgM antibodies.

Conclusions:

• The novel ss vector/primer system significantly simplifies cDNA cloning and sequencing.
• This method is particularly useful for cloning and sequencing multiple allelic variants of polymorphic loci with conserved 3' sequences.
• The protocol offers a more efficient approach for genetic research involving polymorphic gene regions.