Osteopetrosis, Autosomal Recessive 1, also known as autosomal recessive osteopetrosis 1, is related to autosomal recessive malignant osteopetrosis and osteopetrosis, autosomal recessive 5, and has symptoms including ophthalmoplegia An important gene associated with Osteopetrosis, Autosomal Recessive 1 is TCIRG1 (T Cell Immune Regulator 1, ATPase H+ Transporting V0 Subunit A3), and among its related pathways/superpathways are Transport of inorganic cations/anions and amino acids/oligopeptides and Signaling by Receptor Tyrosine Kinases. The drug Levoleucovorin has been mentioned in the context of this disorder. Affiliated tissues include bone and bone marrow, and related phenotypes are splenomegaly and hepatomegaly