Sex determination and sex differentiation are important phenomena in fish, but the mechanisms of sex determination in Takifugu rubripes are poorly understood. In our study, the expression patterns of genes for DMRTs (...Sex determination and sex differentiation are important phenomena in fish, but the mechanisms of sex determination in Takifugu rubripes are poorly understood. In our study, the expression patterns of genes for DMRTs (DMRT1, DMRT2 and DMRT3), sox9a and sox9b in T. rubripes tissues were verified with the Reverse Transcription (RT)-PCR detection. It is showed that DMRT1 expressions in testis and ovaries were much lower, and no expressions were found in muscle, blood and tailfin. However, expressions for DMRT2 and DMRT3 were not found in the tissues stated above. Transcripts of sox9a were detected in muscle, fin, ovary and testis, but not in blood, whereas sox9b expression was only detected in ovary. The expression patterns of DMRTs, sox9a and sox9b in T. rubripes gonads suggest that these genes may not be sex-specific.展开更多
在一些爬行动物中,个体的性别完全取决于胚胎发育过程中的环境温度,称之为温度依赖型性别决定(temperaturedependent sex determination,TSD).TSD的分子机制长期是个谜,特别是调控早期性腺分化的分子基础仍不清楚.本文通过表达分析和基...在一些爬行动物中,个体的性别完全取决于胚胎发育过程中的环境温度,称之为温度依赖型性别决定(temperaturedependent sex determination,TSD).TSD的分子机制长期是个谜,特别是调控早期性腺分化的分子基础仍不清楚.本文通过表达分析和基因敲低手段研究了Sox9基因在红耳龟雄性性腺分化中的生物学功能,为TSD动物的性别决定和性腺发育的分子机制的研究奠定了基础.qRT-PCR显示,从性腺分化前的17期起,Sox9呈现产雄温度(male-producing temperature,MPT)性腺特异性高表达,而在产雌温度(female-producing temperature,FPT)性腺中表达水平极低.免疫组化进一步证实了SOX9蛋白的MPT特异性表达趋势,其定位于Sertoli前体细胞核中.温度置换实验显示,与MPT性腺相比,MPT→FPT性腺中(16期置换)的Sox9表达量从17期起就显著降低,表明Sox9能快速响应温度变化.同时MPT性腺经过雌激素处理后,Sox9表达量亦快速下调.功能缺失研究显示,经过Sox9-RNAi处理后,90.9%(20/22)的MPT性腺结构明显雌性化,皮质区高度发育,髓质区退化,揭示Sox9的敲低能导致雄性向雌性性逆转.上述研究表明,Sox9是红耳龟早期睾丸分化的关键调控因子,参与TSD的雄性分化通路.展开更多
目的鉴定胆管癌(cholangiocarcinoma,CCA)甲基化与表达谱综合生物标志物,预测CCA患者预后。方法从癌症基因组图谱(The Cancer Genome Atlas,TCGA)下载33例CCA样本和8例正常样本基因组甲基化数据及临床信息表达谱数据,同时从基因表达综...目的鉴定胆管癌(cholangiocarcinoma,CCA)甲基化与表达谱综合生物标志物,预测CCA患者预后。方法从癌症基因组图谱(The Cancer Genome Atlas,TCGA)下载33例CCA样本和8例正常样本基因组甲基化数据及临床信息表达谱数据,同时从基因表达综合数据库(Gene Expression Omnibus,GEO)下载甲基化数据进行验证。鉴定差异甲基化基因(DMGs)与差异表达基因(DEGs)的交集基因,采用Cox比例风险回归模型鉴定甲基化生物标志物,并使用ROC曲线来评估该模型的性能。在验证组中对该模型进行验证,通过GO功能注释,探讨DNA甲基化标志物的生物学功能。结果通过对TCGA甲基化数据分析,共鉴定出600个差异甲基化基因和6876个差异表达基因,并从中筛选出与生存相关的2个甲基化基因(SOX9和FZD10),最终将SOX9和FZD10组合基因构建预后预测模型,作为CCA预后的生物标志物。ROC曲线下面积(AUC)为0.90。SOX9和FZD10组合生物标志物能够将CCA患者区分为高风险组和低风险组,低风险组患者总生存期明显高于高风险组(2.07年vs 0.92年)。多因素Cox回归分析表明,SOX9和FZD10组合生物标志物是CCA患者预后的独立预测因子。基因本体(GO)功能分析表明,SOX9和FZD10参与转录因子、转录调控、肿瘤蛋白多糖调节和干细胞的调控。结论本研究经过多组学分析,在TCGA数据中筛选出SOX9和FZD10基因组合的甲基化预后标志物,可以将CCA患者分为高风险组与低风险组,并且该组合基因是CCA独立的预后预测因子。展开更多
文摘Sex determination and sex differentiation are important phenomena in fish, but the mechanisms of sex determination in Takifugu rubripes are poorly understood. In our study, the expression patterns of genes for DMRTs (DMRT1, DMRT2 and DMRT3), sox9a and sox9b in T. rubripes tissues were verified with the Reverse Transcription (RT)-PCR detection. It is showed that DMRT1 expressions in testis and ovaries were much lower, and no expressions were found in muscle, blood and tailfin. However, expressions for DMRT2 and DMRT3 were not found in the tissues stated above. Transcripts of sox9a were detected in muscle, fin, ovary and testis, but not in blood, whereas sox9b expression was only detected in ovary. The expression patterns of DMRTs, sox9a and sox9b in T. rubripes gonads suggest that these genes may not be sex-specific.
文摘在一些爬行动物中,个体的性别完全取决于胚胎发育过程中的环境温度,称之为温度依赖型性别决定(temperaturedependent sex determination,TSD).TSD的分子机制长期是个谜,特别是调控早期性腺分化的分子基础仍不清楚.本文通过表达分析和基因敲低手段研究了Sox9基因在红耳龟雄性性腺分化中的生物学功能,为TSD动物的性别决定和性腺发育的分子机制的研究奠定了基础.qRT-PCR显示,从性腺分化前的17期起,Sox9呈现产雄温度(male-producing temperature,MPT)性腺特异性高表达,而在产雌温度(female-producing temperature,FPT)性腺中表达水平极低.免疫组化进一步证实了SOX9蛋白的MPT特异性表达趋势,其定位于Sertoli前体细胞核中.温度置换实验显示,与MPT性腺相比,MPT→FPT性腺中(16期置换)的Sox9表达量从17期起就显著降低,表明Sox9能快速响应温度变化.同时MPT性腺经过雌激素处理后,Sox9表达量亦快速下调.功能缺失研究显示,经过Sox9-RNAi处理后,90.9%(20/22)的MPT性腺结构明显雌性化,皮质区高度发育,髓质区退化,揭示Sox9的敲低能导致雄性向雌性性逆转.上述研究表明,Sox9是红耳龟早期睾丸分化的关键调控因子,参与TSD的雄性分化通路.