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Thermal cycle labeling: zeptomole detection sensitivity and microgram probe amplification using CviJl*
N Swaminathan1, K McMaster, P M Skowron
1CHIMERx, Madison, Wisconsin 53704, USA.
Analytical Biochemistry
|February 4, 1998
Summary
A novel thermal cycle labeling (TCL) method efficiently amplifies and labels DNA probes from anonymous samples. This technique uses a specific endonuclease and nucleotide analogs for sensitive, high-quality probe generation.
Area of Science:
- Molecular Biology
- Biotechnology
Background:
- DNA probe labeling and amplification are crucial for molecular diagnostics and research.
- Existing methods can be inefficient or require specific starting materials.
Purpose of the Study:
- To develop a new, efficient method for labeling and amplifying DNA probes from anonymous samples.
- To enable sensitive detection using minimal starting material.
Main Methods:
- Utilized the endonuclease CviJI* to fragment DNA into small, sequence-specific pieces.
- Employed thermal cycle labeling (TCL) with repeated denaturation, annealing, and extension cycles for amplification.
- Incorporated nucleotide analogs and [alpha-33P]dCTP for hapten-tagging and radiolabeling.
Main Results:
- Achieved significant amplification of DNA material, generating microgram quantities of probes.
- Demonstrated a detection limit as low as 25 zmol (2.5 x 10^-20 mol) using hapten-tagged probes.
- Produced high-specific-activity probes (2.6 x 10^9 cpm/microgram) with [alpha-33P]dCTP, exhibiting reduced radiolytic decay and a 1-month shelf life.
Conclusions:
- The thermal cycle labeling (TCL) method provides an efficient way to generate amplified and labeled DNA probes.
- CviJI*-generated primers eliminate the need for synthetic oligonucleotides, simplifying probe preparation.
- This protocol is suitable for sensitive molecular detection from limited or anonymous DNA samples.