Journal
THORAX
Volume 67, Issue 5, Pages 433-441Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/thoraxjnl-2011-200301
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Funding
- National Institute of Health [5 U54 HL096458-06]
- Office of the Director
- ORDR
- NHLBI
- National Institutes of Health [5 R01HL071798]
- Children's Discovery Institute
- National Institute of Allergy and Infectious Diseases
- Flight Attendant Medical Research Institute
- Deutsche Forschungsgemeinschaft (DFG) [Om 6/4, GRK1104, SFB592]
- US Federal government from National Heart, Lung, and Blood Institute [N01-HV-48194]
- National Center of Research Resources [RR00046, UL1 RR025747, UL1 RR025780]
- NHLBI [5 U54 HL096458-06, P01 HL034322]
- CFF [R026-CR07]
- NIH Office of Rare Diseases Research (ORDR)
- [R01 HL08265]
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Rationale Primary ciliary dyskinesia (PCD) is an autosomal recessive, genetically heterogeneous disorder characterised by oto-sino-pulmonary disease and situs abnormalities (Kartagener syndrome) due to abnormal structure and/or function of cilia. Most patients currently recognised to have PCD have ultrastructural defects of cilia; however, some patients have clinical manifestations of PCD and low levels of nasal nitric oxide, but normal ultrastructure, including a few patients with biallelic mutations in dynein axonemal heavy chain 11 (DNAH11). Objectives To test further for mutant DNAH11 as a cause of PCD, DNAH11 was sequenced in patients with a PCD clinical phenotype, but no known genetic aetiology. Methods 82 exons and intron/exon junctions in DNAH11 were sequenced in 163 unrelated patients with a clinical phenotype of PCD, including those with normal ciliary ultrastructure (n=58), defects in outer and/or inner dynein arms (n=76), radial spoke/central pair defects (n=6), and 23 without definitive ultrastructural results, but who had situs inversus (n=17), or bronchiectasis and/or low nasal nitric oxide (n=6). Additionally, DNAH11 was sequenced in 13 subjects with isolated situs abnormalities to see if mutant DNAH11 could cause situs defects without respiratory disease. Results Of the 58 unrelated patients with PCD with normal ultrastructure, 13 (22%) had two (biallelic) mutations in DNAH11; and two patients without ultrastructural analysis had biallelic mutations. All mutations were novel and private. None of the patients with dynein arm or radial spoke/central pair defects, or isolated situs abnormalities, had mutations in DNAH11. Of the 35 identified mutant alleles, 24 (69%) were nonsense, insertion/deletion or loss-of-function splice-site mutations. Conclusions Mutations in DNAH11 are a common cause of PCD in patients without ciliary ultrastructural defects; thus, genetic analysis can be used to ascertain the diagnosis of PCD in this challenging group of patients.
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