Juvenile Ankylosing Spondylitis is related to spondylitis and enthesopathy. An important gene associated with Juvenile Ankylosing Spondylitis is MRAP (Melanocortin 2 Receptor Accessory Protein), and among its related pathways/superpathways are Cytokine Signaling in Immune system and Non-genomic actions of 1,25 dihydroxyvitamin D3. Affiliated tissues include bone.