甘草3-羟基-3-甲基戊二酰辅酶A还原酶基因多态性与甘草酸含量的相关性分析

Analysis on correlation between 3-hydroxy-3-methylglutary-coenzyme A reductase gene polymorphism of Glycyrrhiza uralensis and content of glycyrrhizic acid

目的:揭示甘草3-羟基-3-甲基戊二酰辅酶A还原酶(HMGR)基因的多态性,并阐述HMGR基因多态性与甘草酸含量的相关性。方法:以甘草酸含量差异显著的甘草个体为材料,通过RT-PCR法扩增其HMGR基因编码区;与载体pMD19-T连接后克隆测序;通过多重比对进行HMGR基因多态性分析,及与甘草酸含量之间的关联分析。结果:HMGR基因编码区多态性包括整码突变、碱基置换突变、拷贝数多态性及等位基因杂合;HMGR编码氨基酸序列中存在以下4种类型变异,即-HSL,-HSV,GALLV,GALSV,其中-HSV型为甘草中普遍存在类型,-HSL型为甘草酸低含量甘草的特有类型,GALSV型为甘草酸高含量甘草特有类型。结论:甘草HMGR基因编码区具有丰富的多态性,和甘草酸含量之间具有相关性。

Objective： To reveal the 3-hydroxy-3-methylglutary-coenzyme A reductase（HMGR） gene polymorphism of Glycyrrhiza uralensis, and the correlation between HMGR gene polymorphism and the content of glycyrrhizic acid. Method： Liquorice plants containing different content of glycyrrhizic acid were used as materials. RT-PCR was used to amplify their HMGR gene sequences, which were connected with vector pMD19-T for clone sequencing. Multiple alignments were performed to analyse HMGR gene polymorphism of G. uralensis. Then the correlation between HMGR gene polymorphism and the content of glycyrrhizic acid was revealed. Resuit： HMGR gene sequences polymorphism included codon mutation, base substitution mutation, copy number polymorphism and allele heterozygosity. There were 4 types of mutations in HMGR gene coding amino acid sequences, namely -HSL, -HSV, GALLV,GALSV. Among them, -HSV type was common in liquorice plants, -HSL type only existed in liquorice plants with low content of glycyrrhizic acid, and GALSV type only existed in liquorice plants with high content of glycyrrhizic acid. Conclusion： HMGR gene sequences of G. uralensis are highly polymorphic and related to the content of glycyrrhizic acid.