Sera from human subjects affected by autoimmune connective tissue diseases and containing antiribosomal autoantibodies were used to analyze by immunoblotting ribosomal proteins from trout (Oncorhynchus mykiss) liver, mussel (Mytilus edulis) hepatopancreas and whole fly maggots (Calliphora vomitoria). As usual in medical analysis of autoantibodies, the reference antigen preparation was extracted from rat liver. With the used sera, six known ribosomal proteins from rat liver were characterized: P0, P1, P2, p30, p25 and p20. These six proteins were all targeted in trout; moreover an important 40 kDa fraction, undetectable in rat pattern, was seen. p30 and p20 were undetected in mussel and fly maggot; but p25, undetected in mussel, is clearly characterized in fly maggot. The interest of these data to infer phylogenic relationships is discussed.
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