Nucleotide sequence encoding a 52 kDa Ro/SSA autoantigen
First Claim
1. An isolated nucleic acid molecule separate from the human genome encoding a Ro/SSA human autoantigen having a molecular weight by SDS-PAGE and Western blot of 52 kDa, or encoding an effective amount of the amino acid sequence of the Ro/SSA autoantigen to form an epitope immunoreactive with an anti-Ro/SSA autoantibody and which is isolated by a process comprising hybridizing under standard conditions to nucleic acid probes having the sequence set forth in FIG. 1 or portions thereof.
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Abstract
Complementary DNA encoding a 52 kDa form of a protein present in the human Ro/SSA ribonucleoprotein complex has been cloned. A lambda gt11 cDNA library made from human thymocyte mRNA was screened with serum from a SLE patient and two immunoreactive clones were isolated. These clones reacted with other patient sera which had anti-52 kDa Ro/SSA antibodies and with affinity purified anti-52 kDa Ro/SSA antibodies. Moreover, affinity purified antibodies eluted from fusion proteins of the isolated clones reacted only with the 52 kDa protein of lymphocytes in the Western blot. Ro/SSA RNAs were also precipitated with these affinity purified antibodies, further confirming that the clones encode a 52 kDa Ro/SSA antigen. The sequence differs from the previously reported 60 kDa Ro/SSA gene.
1 Citation
7 Claims
- 1. An isolated nucleic acid molecule separate from the human genome encoding a Ro/SSA human autoantigen having a molecular weight by SDS-PAGE and Western blot of 52 kDa, or encoding an effective amount of the amino acid sequence of the Ro/SSA autoantigen to form an epitope immunoreactive with an anti-Ro/SSA autoantibody and which is isolated by a process comprising hybridizing under standard conditions to nucleic acid probes having the sequence set forth in FIG. 1 or portions thereof.
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5. An isolated nucleic acid molecule separate from the human genome consisting of nucleotides 1 to 38 of the sequence set forth in FIG. 1.
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6. An isolated nucleic acid molecule separate from the human genome consisting of nucleotides 1467 to 1843 of the sequence set forth in FIG. 1.
Specification