Dideoxy DNA sequencing with end-labeled oligonucleotide primers.

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• DNA sequencing is crucial for genetic analysis and research.
• The dideoxy method is a standard technique for DNA sequencing.
• Radiolabeling is often employed to detect sequencing products.

Purpose of the Study:

• To evaluate the efficacy of end-labeled oligonucleotide primers as a radiolabel source in dideoxy DNA sequencing.
• To demonstrate the versatility of this method with different primers and templates.
• To present an economical and convenient alternative to existing radiolabeling strategies.

Main Methods:

• End-labeling of oligonucleotide primers with a radiolabel.
• DNA sequencing using the dideoxy method with end-labeled primers.
• Utilizing both single-stranded (M13) and denatured double-stranded DNA templates.
• Storage and analysis of labeled primers and extension products.

Main Results:

• End-labeled oligonucleotide primers effectively serve as the radiolabel source in dideoxy DNA sequencing.
• The method is applicable to various primers, including universal primers and mixed-sequence probes.
• Both single-stranded and denatured double-stranded DNA templates are compatible.
• Labeled primers and extension products exhibit stability during storage for weeks.

Conclusions:

• End-labeled oligonucleotide primers provide a practical and cost-effective method for radiolabeling in DNA sequencing.
• This technique facilitates the identification of clones isolated via oligonucleotide hybridization.
• It offers a valuable alternative to using alpha-labeled deoxynucleoside triphosphates for radiolabeling.