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. 1984 Mar;73(3):832–841. doi: 10.1172/JCI111278

Circulating DNA in systemic lupus erythematosus. Isolation and characterization.

C R Steinman
PMCID: PMC425087  PMID: 6323528

Abstract

Immunoprecipitable double-stranded (dsDNA) was previously shown to persist in the circulation of a clinically recognizable subgroup of patients with systemic lupus erythematosus (SLE). Plasma from 10 such patients was subjected to a DNA isolation procedure that used a combination of proteolysis, phenol extraction, and hydroxylapatite adsorption and elution in the presence of urea. The isolated dsDNA was radiolabeled by nick translation and then characterized by isopyknic ultracentrifugation in CsCl under both neutral and alkaline conditions, as well as after digestion with S1-endonuclease. These experiments demonstrated essential identity in nucleotide base composition between the plasma-derived DNA and human genomic DNA. The presence of specific human base sequences in the plasma DNA was demonstrated by finding that authentic human genomic DNA accelerated the renaturation of plasma DNA when compared with the effect of nonhuman, control DNA. The proportion of such sequences in plasma DNA was estimated by attempting to renature the plasma DNA in the presence of human DNA under conditions shown to result in complete renaturation of human DNA in model experiments. In this way, a minimum of 47% of plasma DNA base sequences could be shown also to be present in human genomic DNA. However, an average of 10-20% of the plasma-derived DNA failed to renature under these conditions, a result that was further confirmed by comparing the renaturation of the tritium-labeled plasma DNA specimens, in double-label experiments, with internal controls consisting of 14C-labeled authentic human DNA. Attempts to drive the reaction to completion with human DNA led to a similar conclusion. The relative nonrenaturability of this fraction of plasma DNA did not appear to be attributable to extensive chain breakage, although adequate analysis of this DNA subfraction was limited by reagent availability. It was therefore concluded that, in this group of SLE patients, persistently circulating DNA consisted largely of base sequences also found in human genomic DNA. The additional presence in plasma of a DNA subfraction that differed in its renaturation behavior from human genomic DNA was recognized, although its significance could not be established with certainty.

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Selected References

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