Anthocyanin is an important pigment that affects plant color and nutritional quality.MYBs play an important role in plant anthocyanin synthesis and accumulation.However,the regulatory function of MYB transcription fac...Anthocyanin is an important pigment that affects plant color and nutritional quality.MYBs play an important role in plant anthocyanin synthesis and accumulation.However,the regulatory function of MYB transcription factors in anthocyanin synthesis in flax flowers is still unclear.In this study,402 MYB transcription factors were identified in the flax genome.These MYB members are unevenly distributed on 15 chromosomes.The R2R3-LuMYB members were divided into 32phylogenetic subfamilies.qRT-PCR analysis showed that seven R2R3-LuMYB genes in the adjacent subfamily of the evolutionary tree had similar expression patterns,among which Lu MYB216 was highly expressed in the petals of different colors.Moreover,gene editing of LuMYB216 in flax showed that the petal color,anther color and seed coat color of mutant plants were significantly lighter than those of wild-type plants,and the anthocyanin content of lumyb216 mutant plants was significantly reduced.Correlation analysis indicated that LuMYB216 was significantly positively correlated with the upstream regulator bHLH30.This study systematically analyzed the MYB gene family in flax,laying a foundation for studying the regulation of LuMYB216 in flax flower anthocyanin synthesis.展开更多
文摘目的 探讨胃癌患者血清miR-216b和miR-132水平表达与临床预后的关系。方法 选取2018年1月~2020年2月在佳木斯市中心医院就诊的87例胃癌患者作为胃癌组,选择同期87例健康体检者作为对照组。实时荧光定量PCR (quantitative real-time PCR,qRT-PCR)检测血清中miR-216b和miR-132表达水平,分析胃癌患者血清miR-216b和miR-132表达水平与临床病理特征的关系。根据胃癌患者随访期间的生存或死亡情况,将胃癌患者分为预后良好组(生存,n=51)和预后不良组(死亡,n=36),用受试者工作特征(receiver operating characteristic,ROC)曲线分析血清miR-216b和miR-132表达水平对胃癌患者预后的预测价值;COX回归分析影响胃癌患者预后的因素。结果 与对照组比较,胃癌组血清中miR-216b (0.69±0.20 vs 1.02±0.24)和miR-132 (0.73±0.19 vs 1.01±0.22)表达水平降低,差异具有统计学意义(t=9.853,8.984,均P<0.001)。分化程度为低分化、TNM分期为Ⅲ±Ⅳ期、有淋巴结转移、有远处转移的胃癌患者血清miR-216b,miR-132表达水平低于分化程度为中、高分化、TNM分期为Ⅰ±Ⅱ期、无淋巴结转移、无远处转移的胃癌患者,差异具有统计学意义(t=6.266,3.412,2.890,2.723;4.999,3.734,4.180,5.502,均P<0.05)。与预后良好组比较,预后不良组胃癌患者血清中miR-216b(0.56±0.16vs 0.78±0.23)和miR-132(0.60±0.11 vs 0.82±0.25)表达水平降低,差异具有统计学意义(t=4.952,4.946,均P<0.001)。血清miR-216b,miR-132及二者联合预测胃癌患者预后的曲线下面积(area under the cure,AUC)分别为0.797 (95%CI:0.706~0.889),0.832(95%CI:0.745~0.918)和0.900 (95%CI:0.836~0.964);敏感度和特异度分别为83.3%,68.6%;97.2%,62.7%和79.4%,72.5%;当血清miR-216b,miR-132预测胃癌患者预后不良的截断值分别为0.66,0.76时,预测的敏感度较高。COX回归分析显示,miR-216b低表达、miR-132低表达、分化程度为低分化、TNM分期为Ⅲ+Ⅳ期、有淋巴结转移、有远处转移是胃癌患者预后不良的危险因素(均P<0.05)。结论miR-216b和miR-132在胃癌患者血清中呈低表达,二者可作为预测胃癌患者预后的有效生物标志物。
基金supported by the National Natural Science Foundation of China(31801409)the Innovation and Entrepreneurship Training Program for College Students,Jiangsu Province,China(202210304103Y)the Science and Technology Project of Nantong City,Jiangsu Province,China(JC2020156)。
文摘Anthocyanin is an important pigment that affects plant color and nutritional quality.MYBs play an important role in plant anthocyanin synthesis and accumulation.However,the regulatory function of MYB transcription factors in anthocyanin synthesis in flax flowers is still unclear.In this study,402 MYB transcription factors were identified in the flax genome.These MYB members are unevenly distributed on 15 chromosomes.The R2R3-LuMYB members were divided into 32phylogenetic subfamilies.qRT-PCR analysis showed that seven R2R3-LuMYB genes in the adjacent subfamily of the evolutionary tree had similar expression patterns,among which Lu MYB216 was highly expressed in the petals of different colors.Moreover,gene editing of LuMYB216 in flax showed that the petal color,anther color and seed coat color of mutant plants were significantly lighter than those of wild-type plants,and the anthocyanin content of lumyb216 mutant plants was significantly reduced.Correlation analysis indicated that LuMYB216 was significantly positively correlated with the upstream regulator bHLH30.This study systematically analyzed the MYB gene family in flax,laying a foundation for studying the regulation of LuMYB216 in flax flower anthocyanin synthesis.
