DNA banking: the effects of storage of blood and isolated DNA on the integrity of DNA

Am J Med Genet. 1987 Jun;27(2):379-90. doi: 10.1002/ajmg.1320270216.


Long-term storage of DNA is required for a number of genetic studies; prior to extraction, blood samples may be subject to elevated temperatures for variable intervals. We have studied the effect of temperatures ranging from -70 degrees C to +65 degrees C on human blood and on DNA extracted from it. DNA in solution stored at ambient temperatures up to 37 degrees C for 6 months was digestible by three different restriction endonucleases, whereas storage at 45 degrees C is deleterious after 6-7 weeks. DNA can be extracted from blood samples stored at -70 degrees C for at least 2 months or at 23 degrees C for a week or more, but blood stored at these temperatures may yield less high-molecular-weight DNA. Cell pellets from which plasma has been removed also can serve as a source of DNA. Isolated DNA stored dry for years (up to 30) is difficult to dissolve and may appear degraded, but a sample stored dry for 13 years and then in solution at -20 degrees C for 7 years appeared to be intact.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Blood Preservation*
  • DNA / genetics
  • DNA / isolation & purification*
  • DNA Damage*
  • DNA, Recombinant
  • Humans
  • Leukocytes / analysis
  • Retrospective Studies
  • Temperature
  • Tissue Banks*


  • DNA, Recombinant
  • DNA