Objective To investigate the relationship between NKX2. 5 gene mutation and atrial septal defect( ASD) in the Zhuang people with congenital heart disease( CHD) of the Guangxi Zhuang Autonomous Region. Methods Polymerase chain reaction and DNA sequencing were used to detect all exons and flanking sequences of NKX2. 5 gene in 30 Zhuang people with CHD-ASD from Guangxi( CHD group) and 30 subjects without CHD( control group). Genotyping of single nucleotide polymorphism( SNP) loci was performed. The association...