目的·利用微阵列芯片技术检测高脂饮食诱导的小鼠非酒精性脂肪性肝病（non-alcoholic fatty liver disease，NAFLD）模型中肝组织mRNA的m⁶A甲基化修饰和基因表达的变化。方法·以6~8周龄雄性C57BL/6J小鼠为实验动物，高脂饲料喂养16周诱导建立NAFLD模型（高脂组，n=10）；另设基础组（n=10）为对照，给予含10%脂肪的基础饲料喂养。苏木精-伊红（hematoxylin-eosin，H-E）染色评估小鼠肝组织病理改变，判断NAFLD模型是否构建成功。运用甲基化RNA免疫共沉淀技术（methylated RNA immunoprecipitation，MeRIP）和微阵列测序技术（microarray表达谱分析）检测2组小鼠肝组织中mRNA的m⁶A甲基化和表达水平变化。结果·基础组小鼠肝脏呈鲜红色，少见脂肪沉积；高脂组小鼠肝脏边界黄润，H-E染色可见肝细胞中脂滴弥漫浸润且相互融合，提示高脂饲料诱导的NAFLD模型构建成功。MeRIP-微阵列芯片检测结果显示，与基础组相比，高脂组小鼠肝脏中共有320个基因m⁶A甲基化修饰水平变化显著（P<0.05且变化倍数>1.5），其中有108个上调基因和212个下调基因。将组间m⁶A甲基化水平差异显著的基因与mRNA差异表达基因取交集，发现有163个基因m⁶A甲基化水平和mRNA表达水平均差异显著。结论·高脂饮食诱导的小鼠NAFLD模型中肝组织mRNA的m⁶A修饰变化显著，且该变化与mRNA的基因表达有关。

Objective ·To detect the differences in m⁶A methylation modification and gene expression of liver tissue mRNA in high-fat diet-induced mouse models of non-alcoholic fatty liver disease (NAFLD) using microarray technology. Methods ·The NAFLD models were established in 6-8 weeks old male C57BL/6J mice fed with high-fat chow for 16 weeks (high-fat group, n=10). The basal group (n=10) was given 10% fat diet. Hematoxylin-eosin (H-E) staining was used to assess the histopathological changes in liver tissue and to determine the success of the NAFLD models. The changes of mRNA m⁶A methylation and expression levels in the liver tissues of the two groups were detected by using methylated RNA immunoprecipitation (MeRIP) and microarray expression profiling. Results ·The livers of the mice in the basal group were bright red with few fat deposits, while the livers of the mice in the high-fat group were yellowish with diffuse infiltration and fusion of lipid droplets in the hepatocytes by H-E staining, suggesting that the high-fat diet-induced NAFLD models were successfully constructed. The results of the MeRIP-microarray showed that the m⁶A methylation levels of 320 genes in the livers of mice in the high-fat group were significantly altered compared with those in the basal group (P<0.05 and fold change>1.5), of which 108 genes were up-regulated and 212 genes were down-regulated. Genes with significant differences in m⁶A methylation levels between the two groups were intersected with those with differentially expressed mRNAs, and 163 genes were found to have significant differences in both m⁶A methylation level and mRNA expression level. Conclusion ·The change in m⁶A modification of liver tissue mRNA in the high-fat diet-induced mouse models of NAFLD is significant and the change is associated with the gene expression of mRNA.