DNAH9 and primary ciliary dyskinesia: Disruptions in DNAHs, such as DNAH5 (Hornef et al., 2006; Olbrich et al., 2002), DNAH6 (Li et al., 2016), DNAH9 (Fassad et al., 2018; Loges et al., 2018), and DNAH11 (Bartoloni et al., 2002; Knowles et al., 2012; Lucas et al., 2012; Schwabe et al., 2008), are known to cause, or are associated with, primary ciliary dyskinesia (PCD), a genetically heterogeneous disorder that is characterized by chronic airway diseases, left–right laterality disturbances, and male infertility (Leigh et al., 2009).