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Zhou N, Liang W, Zhang Y, Quan G, Li T, Huang S, Huo Y, Cui H, Cheng Y. ODAD1 variants resulting from splice-site mutations retain partial function and cause primary ciliary dyskinesia with outer dynein arm defects. Front Genet 2023; 14:1270278. [PMID: 38028630 PMCID: PMC10651219 DOI: 10.3389/fgene.2023.1270278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/13/2023] [Indexed: 12/01/2023] Open
Abstract
Primary ciliary dyskinesia (PCD) is a genetically heterogeneous disorder caused by defects in motile ciliary function and/or structure. Outer dynein arm docking complex subunit 1 (ODAD1) is an important component of the outer dynein arm docking complex (ODA-DC). To date, 13 likely pathogenic mutations of ODAD1 have been reported. However, the pathogenesis of ODAD1 mutations remains elusive. To investigate the pathogenesis of splice-site mutations in ODAD1 discovered in this study and those reported previously, molecular and functional analyses were performed. Whole-exome sequencing revealed a compound mutation in ODAD1 (c.71-2A>C; c.598-2A>C) in a patient with PCD, with c.598-2A>C being a novel mutation that resulted in two mutant transcripts. The compound mutation in ODAD1 (c.71-2A>C; c.598-2A>C) led to aberrant splicing that resulted in the absence of the wild-type ODAD1 and defects of the outer dynein arm in ciliary axonemes, causing a decrease in ciliary beat frequency. Furthermore, we demonstrated that the truncated proteins resulting from splice-site mutations in ODAD1 could retain partial function and inhibit the interaction between wild-type ODAD1 and ODAD3. The results of this study expand the mutational and clinical spectrum of PCD, provide more evidence for genetic counseling, and offer new insights into gene-based therapeutic strategies for PCD.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Yuanxiong Cheng
- Department of Pulmonary and Critical Care Medicine, The Third Affiliated Hospital of Southern Medical University, Guangzhou, China
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Hunter‐Schouela J, Geraghty MT, Hegele RA, Dyment DA, Pierre DS, Richer J, Sheffield H, Zariwala MA, Knowles MR, Lehman A, Dell S, Shapiro AJ, Kovesi TA. First reports of primary ciliary dyskinesia caused by a shared DNAH11 allele in Canadian Inuit. Pediatr Pulmonol 2023; 58:1942-1949. [PMID: 37088965 PMCID: PMC10330405 DOI: 10.1002/ppul.26414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 02/07/2023] [Accepted: 03/31/2023] [Indexed: 04/25/2023]
Abstract
BACKGROUND Primary ciliary dyskinesia (PCD) is typically an autosomal recessive disease characterized by recurrent infections of the lower respiratory tract, frequent and severe otitis media, chronic rhinosinusitis, neonatal respiratory distress, and organ laterality defects. While severe lower respiratory tract infections and bronchiectasis are common in Inuit, PCD has not been recognized in this population. METHODS We report a case series of seven Inuit patients with PCD identified by genetic testing in three Canadian PCD centers. RESULTS Patients ranged from 4 to 59 years of age (at time of last evaluation) and originated in the Qikiqtaaluk region (Baffin Island, n = 5), Nunavut, or Nunavik (northern Quebec, n = 2), Canada. They had typical features of PCD, including neonatal respiratory distress (five patients), situs inversus totalis (four patients), bronchiectasis (four patients), chronic atelectasis (six patients), and chronic otitis media (six patients). Most had chronic rhinitis. Genetic evaluation demonstrated that all had homozygous pathogenic variants in DNAH11 at NM_001277115.1:c.4095+2C>A. CONCLUSIONS The discovery of this homozygous DNAH11 variant in widely disparate parts of the Nunangat (Inuit homelands) suggests this is a founder mutation that may be widespread in Inuit. Thus, PCD may be an important cause of chronic lung, sinus, and middle ear disease in this population. Inuit with chronic lung disease, including bronchiectasis or laterality defects, should undergo genetic testing for PCD. Consideration of including PCD genetic analysis in routine newborn screening should be considered in Inuit regions.
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Affiliation(s)
- Julia Hunter‐Schouela
- Department of Pediatrics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Michael T. Geraghty
- Department of Pediatrics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Robert A. Hegele
- Department of Medicine and Robarts Research Institute, Western University, London, Ontario, Canada
| | - David A. Dyment
- Department of Genetics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - David St Pierre
- Respiratory Epidemiology and Clinical Research Unit, Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Julie Richer
- Department of Genetics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
| | - Holden Sheffield
- Department of Pediatrics, Qikiqtani General Hospital, Iqaluit, Nunavut, Canada
| | - Maimoona A. Zariwala
- Department of Pathology and Laboratory Medicine, Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Michael R. Knowles
- Department of Medicine, Marsico Lung Institute, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA
| | - Anna Lehman
- Department of Medical Genetics, University of British Columbia on behalf of the Silent Genomes Precision Medicine Consortium, Vancouver, British Columbia, Canada
| | - Sharon Dell
- Department of Pediatrics, BC Children’s Hospital, Vancouver, British Columbia, Canada
| | - Adam J. Shapiro
- Department of Pediatrics, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - Thomas A. Kovesi
- Department of Pediatrics, Children’s Hospital of Eastern Ontario, Ottawa, Ontario, Canada
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Rabiasz A, Ziętkiewicz E. Schmidtea mediterranea as a Model Organism to Study the Molecular Background of Human Motile Ciliopathies. Int J Mol Sci 2023; 24:ijms24054472. [PMID: 36901899 PMCID: PMC10002865 DOI: 10.3390/ijms24054472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 03/12/2023] Open
Abstract
Cilia and flagella are evolutionarily conserved organelles that form protrusions on the surface of many growth-arrested or differentiated eukaryotic cells. Due to the structural and functional differences, cilia can be roughly classified as motile and non-motile (primary). Genetically determined dysfunction of motile cilia is the basis of primary ciliary dyskinesia (PCD), a heterogeneous ciliopathy affecting respiratory airways, fertility, and laterality. In the face of the still incomplete knowledge of PCD genetics and phenotype-genotype relations in PCD and the spectrum of PCD-like diseases, a continuous search for new causative genes is required. The use of model organisms has been a great part of the advances in understanding molecular mechanisms and the genetic basis of human diseases; the PCD spectrum is not different in this respect. The planarian model (Schmidtea mediterranea) has been intensely used to study regeneration processes, and-in the context of cilia-their evolution, assembly, and role in cell signaling. However, relatively little attention has been paid to the use of this simple and accessible model for studying the genetics of PCD and related diseases. The recent rapid development of the available planarian databases with detailed genomic and functional annotations prompted us to review the potential of the S. mediterranea model for studying human motile ciliopathies.
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Shapiro AJ, Stonebraker JR, Knowles MR, Zariwala MA. A Deep Intronic, Pathogenic Variant in DNAH11 Causes Primary Ciliary Dyskinesia. Am J Respir Cell Mol Biol 2022; 67:511-514. [PMID: 36178856 PMCID: PMC9648669 DOI: 10.1165/rcmb.2022-0176le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Affiliation(s)
- Adam J. Shapiro
- McGill University Health Centre Research InstituteMontreal, Quebec, Canada
| | | | - Michael R. Knowles
- University of North Carolina School of MedicineChapel Hill, North Carolina
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Perspectives for Primary Ciliary Dyskinesia. Int J Mol Sci 2022; 23:ijms23084122. [PMID: 35456939 PMCID: PMC9031447 DOI: 10.3390/ijms23084122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 11/25/2022] Open
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