What is the role of the Jo-1 antigen in the etiology of polymyositis?

Updated: Jan 05, 2021
  • Author: Mythili Seetharaman, MD; Chief Editor: Herbert S Diamond, MD  more...
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The Jo-1 antigen is histidyl-tRNA synthetase. This enzyme is partially responsible for attaching tRNA to their cognate ribosomal RNA (rRNA). The Jo-1 antigen migrates as a 53-kd protein on sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS-PAGE).

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