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. 1990 Apr;80(1):38–43. doi: 10.1111/j.1365-2249.1990.tb06438.x

A recombinant topoisomerase I used for autoantibody detection in sera from patients with systemic sclerosis.

R Verheijen 1, F Van den Hoogen 1, R Beijer 1, A Richter 1, E Penner 1, W J Habets 1, W J van Venrooij 1
PMCID: PMC1535233  PMID: 1691063

Abstract

We report the expression of a cDNA clone encoding 695 carboxyl-terminal amino acids of human DNA topoisomerase I (topoI) in Escherichia coli. More than 96% of the anti-HeLa topoI-positive sera from patients with a connective tissue disease displayed also an immunoreactivity with this recombinant protein (the HTopoA protein). Sera from patients with a definite diagnosis systemic sclerosis and reacting with HeLa topoI, all reacted with the HTopoA protein as well. Sera from patients with systemic sclerosis that did not contain anti-topoI antibodies (about 30% of the systemic sclerosis sera), as concluded from HeLa immunoblot, displayed also no immunoreactivity with our recombinant antigen. By expressing different fragments of HTopoA, we were able to assign at least three different autoimmune epitope regions on the HTopoA protein and we show that over a period of 5 years the amount of anti-topoI antibodies against these regions may fluctuate.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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