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Host factors may also be involved in the establishment of pulmonary NTM disease. Cystic fibrosis transmembrane conductance regulator (\n                      <jats:italic>CFTR<\/jats:italic>\n                      ) variants are associated with pulmonary NTM disease and bronchiectasis. However, data on\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants in the Japanese population remain limited.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>\n                      We aimed to determine the frequency of\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants and the impact on the clinical features of pulmonary NTM disease and bronchiectasis in the Japanese population.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      We analysed 458 patients with either pulmonary NTM disease, non-cystic fibrosis bronchiectasis or both at Keio University Hospital from February 2016 to March 2019.\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants were identified using exome sequencing, Sanger sequencing and multiplex ligation-dependent probe amplification (MLPA). These variants were determined to be deleterious using CFTR2 and in silico tools. Clinical characteristics of patients with and without\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants were compared in a 1:8 age-matched and sex-matched ratio. Additionally, exome sequencing was performed for the family of a patient with a family history of pulmonary NTM disease.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Deleterious\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants were identified in 16 patients (3.5%). One variant was identified by MLPA, and 15 by Sanger sequencing. All patients harboured a\n                      <jats:italic>CFTR<\/jats:italic>\n                      variant in one allele. Compared with matched controls, these patients had lower sputum culture conversion rates and higher rates of macrolide resistance. In one family cluster, members with pulmonary NTM disease were found to carry the same\n                      <jats:italic>CFTR<\/jats:italic>\n                      variant.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>\n                      We defined the frequency and clinical characteristics of\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants among the Japanese population with either pulmonary NTM disease, non-cystic fibrosis bronchiectasis or both and found that patients with\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants may be refractory to pulmonary\n                      <jats:italic>Mycobacterium avium<\/jats:italic>\n                      complex disease. Further comprehensive research is needed to assess the impact of\n                      <jats:italic>CFTR<\/jats:italic>\n                      variants on pulmonary NTM disease and bronchiectasis in non-European populations.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjresp-2025-003683","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T14:50:36Z","timestamp":1770216636000},"page":"e003683","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Clinical characteristics of pulmonary non-tuberculous mycobacterial disease with\n                    <i>CFTR<\/i>\n                    variants in the Japanese population"],"prefix":"10.1136","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9181-1527","authenticated-orcid":false,"given":"Genta","family":"Nagao","sequence":"first","affiliation":[{"name":"Division of Pulmonary Medicine, 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