Methods To define the fetus genotypes and gene mutation sites, the PCR and sequencing techniques were applied to amplify and analyze the regions of exon, exon-intron and promoter of TYR gene in probands and their parents of 2 families.

• 方法应用PCR技术扩增TYR基因各外显子、外显子内含子交界区及启动子区,直接以DNA序列测定技术分析先证者或其父母的基因突变,明确致病性突变后,检测胎儿TYR基因相应位点的DNA序列,获知胎儿的基因型。