高度近视人群METTL4基因的单核苷酸多态分析

目的:分析位于18p11.31的METTL4基因的单核苷酸多态(SNPs),探讨它们与高度近视发病的关系。方法:收集正常对照人群71例及高度近视患者177例,其中常染色体显性遗传家系先证者(AD组)59例、常染色体隐性遗传家系先证者(AR组)46例、无明显家系的散发患者(SF组)52例。制备外周血基因组DNA,PCR扩增METTL4基因的外显子序列,应用异源双链-单链构象多态性(HA-SSCP)方法分析PCR产物,对存在差异条带的PCR产物进行测序分析。结果:在METTL4基因的编码区发现2个SNPs位点:SNP7438A→C位于第2外显子,Glu 230 Asp,在GenBank未见报道;SNP131C→A位于第4外显子,Gln310Lys。正常人与高度近视各组SNP7438A→C的基因型分布无明显差异;AR高度近视组、SF高度近视组的SNP131C→A基因型分布与对照人群无显著差异,而AD高度近视与对照组差异显著(P<0.05)。结论: SNP7438A→C与高度近视的发病无关。SNP131C→A与AD高度近视发病的关系需要进一步研究。

SNPs analysis of the METTL4 gene in high myopia groups

AIM: To investigate the single nucleotide polymorphisms (SNPs) in the METTL4 gene which was mapped to 18p11.31, and the relationship between the SNPs and high myopia. METHODS: Genomic DNA was collected from 71 control subjects and 177 individuals with high myopia. Among them, there were 59 autosomal dominant high myopia probands (AD group), 46 autosomal recessive probands (AR group) and 72 patients non-transmitted (SF group). The exons of METTL4 gene were analyzed by polymerase chain reaction, heteroduplex-single strand conformation polymorphism (HA-SSCP) and sequencing. RESULTS: There were 2 SNPs of METTL4 gene in high myopia individuals and control subjects: SNP7438A→C, Glu230Asp, which hadn't been reported in GenBank;and SNP131C→A, Gln310Lys. SNP7438A→C genotypes between controls and high myopia groups were not different. SNP131C→A genotypes between controls and AR or SF groups were not different, while SNP131C→A genotypes showed a significant difference between AD group and control subjects. CONCLUSION: In METTL4 gene, SNP7438A→C is not responsible for high myopia. Further studies are needed to confirm whether SNP131C→A is responsible for autosomal dominant high myopia.