As regards the structural genes, three families carried the DNAH5 nonsense variants p.Glu2814Ter, p.Pro3606Hisfs*23, p.Arg3885Ter, and p.Arg2255Ter earlier reported as a frequent molecular-genetic cause of PCD in patients of different origin, including North American, German, Hungarian, Czech, Brazil and Italian individuals [13, 60–63]. The gene discussed is DNAH5; the disease is primary ciliary dyskinesia.