A targeted next-generation sequencing panel reveals novel mutations in Japanese patients with primary ciliary dyskinesia

Auris Nasus Larynx. 2018 Jun;45(3):585-591. doi: 10.1016/j.anl.2017.09.007. Epub 2017 Sep 19.

Abstract

Objective: Primary ciliary dyskinesia (PCD) is a rare genetic disorder caused by functional impairment of cilia throughout the body. The early diagnosis of PCD is important for the prevention of long-term sequelae; however, this is often challenging because of the phenotypic heterogeneity of PCD and difficulty in genetic analysis. The majority of PCD patients in Japan are not diagnosed properly. To diagnose PCD more accurately, we developed a targeted next-generation sequencing (NGS) panel.

Methods: We examined 46 patients (age range, 1-64 years; 23 male and 23 female) who were clinically suspected of PCD. First, mutation hotspots in DNAH5 and DNAI1 were sequenced by the Sanger method. Next, exome sequencing was performed in 32 known PCD genes using our novel NGS panel with the Ion Torrent PGM system. Variant annotation was generated by Ion Reporter Version 5.0 (Life Technologies). Mutations found in the panel were validated by Sanger sequencing.

Results: Disease-causing gene mutations were found in 10 patients from 7 families: DNAH5 in 4 families, and DNAI1, CCDC40, and RSPH4A in 1 family each. Heterozygous mutations were found in 1 patient. The majority of the mutations found in the present analysis were novel.

Conclusion: Japanese PCD patients have novel mutations in cilia-related genes. This targeted NGS panel can identify disease-causing mutations in patients with PCD.

Keywords: Bronchiectasis; Chronic rhinosinusitis; Gene mutation; Nasal nitric oxide; Secretary otitis media.

MeSH terms

  • Adolescent
  • Adult
  • Asians / genetics*
  • Axonemal Dyneins / genetics*
  • Child
  • Child, Preschool
  • Cytoskeletal Proteins
  • Female
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Infant
  • Japan
  • Kartagener Syndrome / genetics*
  • Male
  • Middle Aged
  • Mutation
  • Proteins / genetics*
  • Sequence Analysis, DNA
  • Young Adult

Substances

  • CCDC40 protein, human
  • Cytoskeletal Proteins
  • DNAI1 protein, human
  • Proteins
  • RSPH4A protein, human
  • Axonemal Dyneins
  • DNAH5 protein, human