Asthma is one of the most common chronic respiratory diseases. Previous study found a series of differentially expressed genes and proteins (transgelin-2, metallothionein-2, ezrin) in asthmatic rat. The aim of the study is to investigate the changes and associations of these gene with asthma in human.

This study will investigate the changes and associations in asthma. In this project, the investigators will explore the changes of gene expression of transgelin-2, metallothionein-2 and ezrin in asthma and investigate their correlation with current diagnosis markers of asthma, including pulmonary function, fractional exhaled nitric oxide,eosinophil counts,immunoglobulin E, interleukin-5, etc.

Inclusion Criteria:

1. Males or females, aged 14-75 years;
2. Patients with a definite diagnosis of bronchial asthma;
3. The diagnosis of asthma according to the Global Initiative for Asthma (GINA), with positive bronchodilator responsiveness (reversibility) test;
4. Healthy volunteers without respiratory symptoms such as cough, wheezing, chest tightness or dyspnea;
5. Agree with all procedures in this trial by signing a written informed consent form.

Exclusion Criteria:

1. Patients with chronic obstructive pulmonary disease or other airway disease;
2. Complicated with other severe primary diseases (including hypertension, cancer, hyperthyroidism, bronchiectasia, cardiac insufficiency) and conditions that would prevent participation in the trial or put the participant at risk;
3. Women who are known to be pregnant or breastfeeding;
4. Not willing to participate;
5. Psychiatric history and neurological disorders can not work normally;
6. Other conditions that the researcher considers inappropriate to participate in this study.

Participants with asthma or non-asthma