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Dogru D, Polat SE, Tan Ç, Tezcan İ, Yalçın SS, Utine E, Oğuz B, Yaz İ, Emiralioğlu N, Hızal M, Yalçın E, Özçelik U, Çağdaş D, Kiper N. Impact of mannose-binding lectin 2 gene polymorphisms on disease severity in noncystic fibrosis bronchiectasis in children. Pediatr Pulmonol 2020; 55:1190-1198. [PMID: 32119194 DOI: 10.1002/ppul.24711] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 02/22/2020] [Indexed: 11/08/2022]
Abstract
BACKGROUND Mannose-binding lectin (MBL) is a complement protein involved in the innate immune system, and is associated with some chronic respiratory diseases including noncystic fibrosis (non-CF) bronchiectasis in adults. The aim of this study was to investigate the frequency of MBL2 gene polymorphisms in children with non-CF bronchiectasis, and the effect of MBL deficiency on disease severity. METHODS Fifty children with non-CF bronchiectasis (bronchiectasis group) and 50 healthy controls (control group) were included. The demographic findings, number of acute pulmonary exacerbations in the previous year, airway cultures, pulmonary function tests, and radiologic scores of the bronchiectasis group were recorded. DNA extraction was performed in both groups and MBL2 gene polymorphisms in codons 52, 54, 57 in exon 1 and H/L, Y/X in the promoter region were studied using real-time polymerase chain reaction. Haplotypes were made by genotypes, and MBL serum expression was classified according to the genotypes in the literature. RESULTS The bronchiectasis group consisted of 23 (46%) patients with primary ciliary dyskinesia, 5 (10%) with primary immunodeficiency diseases, and 22 (44%) with idiopathic bronchiectasis. There were no statistically significant differences between the bronchiectasis and control groups in terms of allele and genotype frequencies of polymorphisms in codons 52, 54, 57 in exon 1 and promoter H/L. However, the YX heterozygote genotype was more frequent in the control group (82%) compared with the bronchiectasis group (50%) (P = .002). The frequency of patients with intermediate serum MBL expression genotype was higher in the bronchiectasis group (20%) than in the control group (0%) (P = .001). In the bronchiectasis group, there were no significant differences in growth, annual pulmonary exacerbation rates in the last year, pulmonary function tests, radiologic scores, and microbiologic findings between low, intermediate, and high-expressing genotypes. CONCLUSIONS In children with non-CF bronchiectasis, MBL genotype was different from healthy controls. MBL deficiency associated only with MBL genotype was not related to disease severity in this group of patients.
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Affiliation(s)
- Deniz Dogru
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Sanem E Polat
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Çağman Tan
- Department of Pediatrics, Division of Pediatric Immunology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - İlhan Tezcan
- Department of Pediatrics, Division of Pediatric Immunology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Sıddıka S Yalçın
- Department of Pediatrics, Division of Social Pediatrics, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Eda Utine
- Department of Pediatrics, Division of Pediatric Genetics, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Berna Oğuz
- Department of Radiology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - İsmail Yaz
- Department of Pediatrics, Division of Pediatric Immunology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Nagehan Emiralioğlu
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Mina Hızal
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Ebru Yalçın
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Uğur Özçelik
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Deniz Çağdaş
- Department of Pediatrics, Division of Pediatric Immunology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
| | - Nural Kiper
- Department of Pediatrics, Division of Pediatric Pulmonology, Faculty of Medicine, Hacettepe University, Ankara, Turkey
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