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Related Experiment Videos

Single copy gene detection requiring minimal cell numbers.

R M Feddersen1, B G Van Ness

  • 1University of Minnesota.

Biotechniques
|January 1, 1989
PubMed
Summary

This study presents a modified DNA extraction and Southern blot method for analyzing minimal cell samples. The technique enables quantitative DNA analysis from as few as 50,000 cells, aiding in leukemia and myeloma diagnostics.

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Area of Science:

  • Molecular Biology
  • Clinical Diagnostics
  • Genetics

Background:

  • Conventional DNA extraction and Southern blot hybridization are limited by sample size.
  • DNA amplification techniques are not universally applicable for all clinical analyses.
  • Minimal cell numbers in clinical samples often hinder molecular diagnostics.

Purpose of the Study:

  • To develop a modified DNA extraction and Southern blot hybridization technique for quantitative analysis of DNA from minimal cell samples.
  • To enable molecular analysis of clinical conditions where sample quantity is a limiting factor.
  • To demonstrate the diagnostic utility of the modified technique in various clinical scenarios.

Main Methods:

  • Cells were immobilized in agarose blocks for lysis, deproteinization, and restriction enzyme digestion.
  • DNA was size-fractionated via agarose gel electrophoresis and analyzed by Southern blot hybridization.
  • The method allows for storage of cells in agarose blocks for extended periods and thawing of frozen cells.

Main Results:

  • The modified technique provides quantitative recovery and analysis of DNA from minimal cell numbers (as few as 5 x 10^4 cells).
  • Single copy sequences can be detected, allowing for sensitive analysis.
  • The method was successfully applied to examine immunoglobulin gene rearrangements in leukemia and myeloma patients and to assess bone marrow engraftment post-transplant.

Conclusions:

  • This modified DNA extraction and Southern blot hybridization technique offers a robust method for analyzing limited clinical samples.
  • The technique has significant diagnostic applications in hematologic malignancies and transplantation monitoring.
  • It overcomes limitations of conventional methods, enabling precise DNA analysis from scarce cellular material.

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