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Bronchiectasis is a chronic disease characterized by airway infection and inflammation, leading to permanent dilation of the bronchi. Evaluation of underlying etiology is important in managing young bronchiectasis patients with recurrent infections caused byunusual pathogens. The signal transducer and activator of transcription 1 (STAT1) protein plays a key role in STAT signaling andimmune system regulation. Heterozygotes for gain-of-function (GOF) alleles of the STAT1 gene usually display autosomal dominantchronic mucocutaneous candidiasis (CMC) and a wide range of clinical features, such as bronchiectasis. Here, we report on apatient with CMC and bronchiectasis with various types of infections who carried a pathogenic variant of the STAT1 gene. The24-year-old female presented with recurrent respiratory bacterial and nontuberculous mycobacterial infections complicated by severebronchiectasis and CMC. Whole-exome sequencing revealed a c.800C>T (p.Ala267Val) heterozygous mutation in the STAT1gene. Further analysis by Sanger sequencing of STAT1 from the patient and her parents revealed the patient had a de novo occurrenceof the variant. This is the first report of a Korean patient with a GOF pathogenic variant in STAT1. Physicians should be awareof the existence of this variant as a genetic factor associated with CMC and bronchiectasis complicated by recurrent infection.

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