In denying Medicaid patients with sickle cell disease or transfusion-dependent beta-thalassemia access to Vertex Pharmaceuticals Inc.’s fertility preservation program, which is intended to counteract a side effect of the company’s gene-editing therapy, Casgevy, “the federal government now stands as the barrier between thousands of predominantly Black Americans and the necessary medical care that would protect their basic right to have biological children,” Vertex said in a lawsuit filed July 15.