Isolated Growth Hormone Deficiency, Type Ia, also known as isolated growth hormone deficiency type ia, is related to microcephalic osteodysplastic primordial dwarfism, type i and seckel syndrome, and has symptoms including back pain, muscle cramp and sciatica. An important gene associated with Isolated Growth Hormone Deficiency, Type Ia is GH1 (Growth Hormone 1), and among its related pathways/superpathways are Mesenchymal Stem Cells and Lineage-specific Markers and G-protein signaling_RhoA regulation pathway. The drugs Anastrozole and Letrozole have been mentioned in the context of this disorder. Affiliated tissues include pituitary and bone, and related phenotypes are hypoglycemia and growth delay