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. 1993 Jan;52(1):183-91.

The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms

M B Frank  1 , K Itoh, A Fujisaku, P Pontarotti, M G Mattei, B R Neas
Affiliations

The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms

M B Frank et al. Am J Hum Genet. 1993 Jan.

Abstract

Autoantibodies to Ro/SSA occur in nearly half of the patients with systemic lupus erythematosus and are associated with lymphopenia, photosensitive dermatitis, and pulmonary and renal disease, which suggests that they have an immunopathologic role. The majority of Ro/SSA precipitin-positive patients produce serum antibodies that bind to the 60-kD and 52-kD Ro/SSA proteins. We previously isolated and determined the nucleotide sequence of a cDNA clone that encodes the 52-kD form of the human Ro/SSA protein. In the present study, we have determined the chromosomal location of the gene by in situ hybridization to the end of the short arm of chromosome 11. Hybridization of portions of the cDNA probe to restriction enzyme-digested DNA indicated the gene is composed of at least three exons. The exon encoding the putative zinc fingers of this protein was found to be distinct from that which encodes the leucine zipper. An RFLP of this gene was identified and is associated with the presence of lupus, primarily in black Americans.

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