Previous reports indicate gene mutations or deletions such as DNAI1, DNAI2, DNAH5, DNAH11, CCDC103, ARMC4, KTU/DNAAF2, LRRC50/DNAAF1, LRRC6, DYX1C1, ZMYND10, CCDC39, CCDC40, CCDC164, HYDIN, RSPH4A and RSPH1 in published cases of PCD and KS [41]. The gene discussed is DNAI2; the disease is primary ciliary dyskinesia.