目的探讨1例46,XY女性性反转患者的遗传发病机制。方法应用核型分析方法分析外周血淋巴细胞染色体、荧光原位杂交(fluorescence in situ hybridization,FISH)技术确认性染色体、Sanger测序法对SRY基因测序、下一代测序技术对外周血DNA...目的探讨1例46,XY女性性反转患者的遗传发病机制。方法应用核型分析方法分析外周血淋巴细胞染色体、荧光原位杂交(fluorescence in situ hybridization,FISH)技术确认性染色体、Sanger测序法对SRY基因测序、下一代测序技术对外周血DNA外显子组测序、多重连接依赖探针扩增(multiplex ligation-dependent probe amplification,MLPA)技术检测NR0B1、SF1、SRY、SOX9、WNT4基因拷贝数变异。结果患者染色体核型为46,XY;FISH分析结果显示性染色体为特异的X和Y信号;Sanger测序未检出SRY基因变异,外显子组高通量测序未见该疾病相关的有害变异,在Xp21上有大约67.31kb的重复片段,此片段包含MAGEB1、MAGEB3、MAGEB4和NR0B1基因;经MLPA分析结果显示,患者和母亲的NR0B1基因有1个拷贝重复。结论Xp21携带的NR0B1基因重复引起的46,XY女性性反转,由表型正常的携带者母亲以X连锁隐性遗传方式传递,具有隐匿性和较高发病率的特点。展开更多
The nuclear receptor DAX-1, encoded by the NR0B1 gene, is presented in the hypothalamic tissues in humans and other vertebrates. Human patients with NR0B1 mutations often have hypothalamic-pituitary defects, but the i...The nuclear receptor DAX-1, encoded by the NR0B1 gene, is presented in the hypothalamic tissues in humans and other vertebrates. Human patients with NR0B1 mutations often have hypothalamic-pituitary defects, but the involvement of NR0B1 in hypothalamic development and function is not well understood. Here, we report the disruption of the nr0b1 gene in zebrafish causes abnormal expression of gonadotropins, a reduction in fertilization rate, and an increase in postfasting food intake, which are indicators of abnormal hypothalamic functions. We find that loss of nr0b1 increases the number of prodynorphin(pdyn)-expressing neurons but decreases the number of pro-opiomelanocortin(pomcb)-expressing neurons in the zebrafish hypothalamic arcuate region(ARC). Further examination reveals that the proliferation of progenitor cells is reduced in the hypothalamus of nr0b1 mutant embryos accompanying the decreased expression of genes in the Notch signaling pathway. Additionally, the inhibition of Notch signaling in wildtype embryos increases the number of pdyn neurons, mimicking the nr0b1 mutant phenotype. In contrast,ectopic activation of Notch signaling in nr0b1 mutant embryos decreases the number of pdyn neurons.Taken together, our results suggest that nr0b1 regulates neural progenitor proliferation and maintenance to ensure normal hypothalamic neuron development.展开更多
基金supported by the National Natural Science Foundation of China (31970917)the National Key Research and Development Program of China (2018YFA0801000)+2 种基金the Shanghai Municipal Science and Technology Major Project (No. 2018SHZDZX01)ZJ LabShanghai Center for Brain Science and Brain-Inspired Technology (Shanghai, China)。
文摘The nuclear receptor DAX-1, encoded by the NR0B1 gene, is presented in the hypothalamic tissues in humans and other vertebrates. Human patients with NR0B1 mutations often have hypothalamic-pituitary defects, but the involvement of NR0B1 in hypothalamic development and function is not well understood. Here, we report the disruption of the nr0b1 gene in zebrafish causes abnormal expression of gonadotropins, a reduction in fertilization rate, and an increase in postfasting food intake, which are indicators of abnormal hypothalamic functions. We find that loss of nr0b1 increases the number of prodynorphin(pdyn)-expressing neurons but decreases the number of pro-opiomelanocortin(pomcb)-expressing neurons in the zebrafish hypothalamic arcuate region(ARC). Further examination reveals that the proliferation of progenitor cells is reduced in the hypothalamus of nr0b1 mutant embryos accompanying the decreased expression of genes in the Notch signaling pathway. Additionally, the inhibition of Notch signaling in wildtype embryos increases the number of pdyn neurons, mimicking the nr0b1 mutant phenotype. In contrast,ectopic activation of Notch signaling in nr0b1 mutant embryos decreases the number of pdyn neurons.Taken together, our results suggest that nr0b1 regulates neural progenitor proliferation and maintenance to ensure normal hypothalamic neuron development.
