Objective: To establish quantitative detection of methylation of γ-globin gene( HBG)promoter by pyrosequencing. Methods: The whole blood DNA samples from 30 patients with mild β-thalassemia diagnosed by gene detection were collected to find the Cp G site in the promoter region of γ-globin gene. PCR amplification primers and pyrosequencing primers were designed. DNA samples were amplified by PCR after transformation by hydrogen sulfite. The PCR products were treated with single strand,followed by pyrosequenc...