title: A passenger strand variant in miR-196a2 contributes to asthma severity in children and adolescents: A preliminary study.
abstract: There is emerging evidence to support the role of microRNAs in allergic airway diseases and inflammation. Genetic variants in microRNA genes might affect microRNA-mediated cell regulation. This preliminary study was designed to investigate the association of the microRNA-196a2 rs11614913 (C/T) polymorphism with susceptibility to asthma and clinical outcomes in children and adolescents. Genotyping of rs11614913 polymorphism was determined in 96 patients with bronchial asthma (6-18 years of age) and 96 unrelated controls, using real-time polymerase chain reaction technology. In-silico target prediction and network core analyses were performed. The asthmatics did not show significant differences in genotype distribution (p = 0.609) and allele frequencies (p = 0.428) compared with the controls. There were also no associations with disease duration, age at onset, asthma phenotype, asthma control, therapeutic level, airway hyper-responsiveness, or biochemical parameters in the blood. However, the CC genotype was associated with a more severe degree of asthma (p = 0. 023) and higher frequency of nocturnal asthma (p = 0.002). Carriers for CC were 17 times more likely to develop nocturnal asthma, and had a more than 2.5-fold increased risk for poor disease outcome compared with CT and TT individuals. In conclusion, microRNA-196a2 rs11614913 polymorphism might be associated with asthma severity in our sample of the Egyptian population. Further investigations in studies with a larger sample size and functional tests are needed to validate our findings and to explore the detailed biological mechanisms.
authors.affiliation: a Pulmongist, Ministry of Health, Egypt.|b Emergency Department, Al Jahra Hospital, Al Jahra, Kuwait.
authors.forename: Mohammad H
authors.initials: MH
authors.lastname: Hussein
authors.affiliation: c Department of Histology and Cell Biology (Genetics Unit), Faculty of Medicine, Suez Canal University, PO Box 41522, Ismailia, Egypt.
authors.forename: Eman A
authors.initials: EA
authors.lastname: Toraih
authors.affiliation: d Department of Medical Biochemistry, Faculty of Medicine, Suez Canal University, PO Box 41522, Ismailia, Egypt.
authors.forename: Nagwa M
authors.initials: NM
authors.lastname: Aly
authors.affiliation: e Department of Chest Diseases and Tuberculosis, Faculty of Medicine, Suez Canal University, PO Box 41522, Ismailia, Egypt.
authors.forename: Eman
authors.initials: E
authors.lastname: Riad
authors.affiliation: d Department of Medical Biochemistry, Faculty of Medicine, Suez Canal University, PO Box 41522, Ismailia, Egypt.
authors.forename: Manal S
authors.initials: MS
authors.lastname: Fawzy
mesh_terms: D000293:Adolescent; D001249:Asthma / Q000235:genetics* / Q000473:pathology; D016022:Case-Control Studies; D002648:Child; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D035683:MicroRNAs / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D060888:Real-Time Polymerase Chain Reaction; D012129:Respiratory Function Tests; D012720:Severity of Illness Index
chemical_list: C542543:MIRN196 microRNA, human; D035683:MicroRNAs
keywords: Egyptians; RT-qPCR; asthma; asthme; miR-196a2; polymorphism; polymorphisme; real-time qPCR; Égyptiens