DNAAF4 and primary ciliary dyskinesia: Interestingly, Drosophila truncated Dnaaf4 resembles the protein that would potentially be synthesised from the human gene bearing the pathogenic mutation detected in PCD: in the original report, 7 out of 9 DNAAF4 variants in PCD patients were nonsense mutations predicted to encode a truncated protein lacking TPR domains (Tarkar et al., 2013).