To research for a genetic marker of bronchial asthma, a single nucleotide polymorphism (SNP) analysis of DNA obtained from the peripheral blood of patients with bronchial asthma and normal control will be performed.

Unrelated Kazaks subjects who have bronchial asthma were recruited in the current study. Genotyping for various SNP associated due to the linkage disequilibrium patterns is to be performed. Genotypes would be statistically compared between patients with bronchial asthma and normal control subjects free of bronchial asthma

Inclusion Criteria:

• Persons with bronchial asthma confirmed by a doctor;
• The age of the patients is from 5 to 60 years;
• Persons of Kazakh nationality, whose paternal and maternal grandparents are Kazakhs.
• Persons who are able and willing to provide written informed consent;
• Persons capable and willing to comply with the research protocol;

Exclusion Criteria:

• Persons who, in the opinion of the researcher, are mentally or legally incapacitated, which prevents obtaining informed consent;
• Pregnant or lactating women;
• Tuberculosis of any localization in the active phase and in history;
• Severe and decompensated diseases of the liver and kidneys, cardiovascular system;
• Severe and decompensated course of endocrine diseases;
• Autoimmune diseases;
• Systemic diseases;
• Oncological diseases;

Persons with bronchial asthma confirmed by a doctor