Primary ciliary dyskinesia (PCD) is an inherited disorder characterized by recurrent infections of the upper and lower respiratory tract, reduced fertility in males and situs inversus in about 50% of affected individuals (Kartagener syndrome). It is caused by motility defects in the respiratory cilia that are responsible for airway clearance, the flagella that propel sperm cells and the nodal monocilia that determine left-right asymmetry1. Recessive mutations that cause PCD have been identified in genes encoding components of the outer dynein arms, radial spokes and cytoplasmic pre-assembly factors of axonemal dyneins, but these mutations account for only about 50% of cases of PCD. We exploited the unique properties of dog populations to positionally clone a new PCD gene, CCDC39. We found that loss-of-function mutations in the human ortholog underlie a substantial fraction of PCD cases with axonemal disorganization and abnormal ciliary beating. Functional analyses indicated that CCDC39 localizes to ciliary axonemes and is essential for assembly of inner dynein arms and the dynein regulatory complex.
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NCBI Reference Sequence
This work was supported by grants from the European Union (LUPA IP) and from the Police Scientifique Fédérale de Belgique (GENFUNC PAI) (to M.G.), from the Legs Poix from the Chancellerie des Universités, the Assistance Publique-Hôpitaux de Paris (PHRC AOM06053, P060245) and the Agence Nationale pour la Recherche (ANR-05-MRAR-022-01) (to S.A.), the US National Institutes of Health (HD04260, DK072301 and DK075972 (to N.K.) and DK079541 (to E.E.D.)) and by grants from the “Deutsche Forschungsgemeinschaft” DFG Om 6/4, GRK1104, SFB592, and the European Community (EU-CILIA; SYS-CILIA) (to H.O.). A.C.M. is a fellow from the FRIA. N.K. is the Jean and George W. Brumley Professor. Y.M. benefits from a postdoctoral fellowship to study abroad from the Japanese Society for the Promotion of Science (JSPS). We thank the Bobtail breeders for assistance; patients and their family members whose cooperation made this study possible; all referring physicians; the German patient support group “Kartagener Syndrom und Primaere Ciliaere Dyskinesie e.V.”; K. Nakamura and the GIGA-R genomics platform for their contribution to sequencing; E. Ostrander for samples from healthy Old English Sheepdogs; the Unité de Recherche Clinique (URC) Est (AP-HP, Hôpital Saint-Antoine, Paris, France) for support; and A. Heer, C. Reinhard, C. Kopp, K. Sutter, M. Petry, C. Tessmer, A.-M. Vojtek and S. Franz for technical assistance.
Ciliary beating pattern of PCD patient OP122 with CCDC39 mutations assessed by high-speed videomicroscopy analyses of respiratory cells obtained by nasal brushing biopsy
Ciliary beating pattern of a healthy control individual assessed by high-speed videomicroscopy analyses of respiratory cells obtained by nasal brushing biopsy
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NovelCFAP43 andCFAP44 mutations cause male infertility with multiple morphological abnormalities of the sperm flagella (MMAF)
Reproductive BioMedicine Online (2019)