Jo-1 antibody

Understanding Jo-1 antibody

Jo-1 antibodies are autoantibodies produced by the immune system against histidyl-tRNA synthetase (Jo-1), an enzyme essential for protein synthesis. Instead of protecting the body, these antibodies mistakenly attack its own tissues, leading to abnormal immune activity. Their presence in the blood is strongly linked to idiopathic inflammatory myopathies, especially polymyositis (causing muscle inflammation and weakness) and dermatomyositis (which involves muscle weakness along with characteristic skin rashes).

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What does Jo-1 antibody measure?

The Jo-1 antibody test is a blood test that detects Jo-1 autoantibodies, which are strongly associated with autoimmune conditions like polymyositis and dermatomyositis. These conditions can cause progressive muscle weakness and, in the case of dermatomyositis, distinctive skin rashes. The test helps in diagnosing, monitoring, and managing such autoimmune disorders.