Zebrafish is a good vertebrate model for development studies. Research on gene expression and regulation during zebrafish embryonic development plays an important role in revealing the molecular mechanism of morphogen...Zebrafish is a good vertebrate model for development studies. Research on gene expression and regulation during zebrafish embryonic development plays an important role in revealing the molecular mechanism of morphogenesis in vertebrate. Tubulin locates the cytoplasmic determinants in eggs, organizes the formation of basic cytoskeleton and controls various cell movements. There are several types of tubulin, each of which has specific expression regions and functions. In this study, the full_length cDNA of a Xenopus β 2 tubulin was used as template to generate Dig_labeled antisense RNA which was used as a probe to carry out in situ hybridization on whole mount zebrafish embryos. Under the experimental conditions, the tubulin transcript was first detected in a group of cells in embryos at the midblastula stage. With the development of the embryo, this transcript was gradually restricted to the nervous system. These results demonstrate that the expression of this β 2 tubulin gene in zebrafish embryos is neural specific.展开更多
Direct exposure to intensive visible light can lead to solar retinopathy, including macular injury. The signs and symptoms include central scotoma, metamorphopsia, and decreased vision. However, there have been few st...Direct exposure to intensive visible light can lead to solar retinopathy, including macular injury. The signs and symptoms include central scotoma, metamorphopsia, and decreased vision. However, there have been few studies examining retinal injury due to intensive light stimulation at the cellular level. Neural network arrangements and gene expression patterns in zebrafish photoreceptors are similar to those observed in humans, and photoreceptor injury in zebrafish can induce stem cell-based cellular regeneration. Therefore, the zebrafish retina is considered a useful model for studying photoreceptor injury in humans. In the current study, the central retinal photoreceptors of zebrafish were selectively ablated by stimulation with high-intensity light. Retinal injury, cell proliferation and regeneration of cones and rods were assessed at 1, 3 and 7 days post lesion with immunohistochemistry and in situ hybridization. Additionally, a light/dark box test was used to assess zebrafish behavior. The results revealed that photoreceptors were regenerated by 7 days after the light-induced injury. However, the regenerated cells showed a disrupted arrangement at the lesion site. During the injury-regeneration process, the zebrafish exhibited reduced locomotor capacity, weakened phototaxis and increased movement angular velocity. These behaviors matched the morphological changes of retinal injury and regeneration in a number of ways. This study demonstrates that the zebrafish retina has a robust capacity for regeneration. Visual impairment and stress responses following high-intensity light stimulation appear to contribute to the alteration of behaviors.展开更多
Proteins of the DYRK(dual-specificity tyrosine-phosphorylation-regulated kinase) family are characterized by the presence of a conserved kinase domain and N-terminal DH box.DYRK2 is involved in regulating key developm...Proteins of the DYRK(dual-specificity tyrosine-phosphorylation-regulated kinase) family are characterized by the presence of a conserved kinase domain and N-terminal DH box.DYRK2 is involved in regulating key developmental and cellular processes,such as neurogenesis,cell proliferation,cytokinesis,and cellular differentiation.Herein,we report that the ortholog of DYRK2 found in zebrafish shares about 70% identity with that of human,mouse,and chick.RT-PCR showed that DYRK2 is expressed maternally and zygotically.In-situ hybridization results show that DYRK2 is expressed in somite cells that will develop into muscles.Our results provide preliminary evidence for investigating the in-vivo function of DYRK2 in zebrafish muscle development.展开更多
目的观察外源性视黄酸对斑马鱼心脏前后轴发育即心脏房室分化的影响。方法采用化学遗传学方法在斑马鱼胚胎发育至12.5hpf(hours post fertilization)给予5×10-8mol/L和10-7mol/L外源性视黄酸处理1.5h。应用胚胎整体原位杂交观察视...目的观察外源性视黄酸对斑马鱼心脏前后轴发育即心脏房室分化的影响。方法采用化学遗传学方法在斑马鱼胚胎发育至12.5hpf(hours post fertilization)给予5×10-8mol/L和10-7mol/L外源性视黄酸处理1.5h。应用胚胎整体原位杂交观察视黄酸对心脏特异基因vmhc,amhc,nkx2.5和nppa表达的影响。结果vmhc,amhc探针的整体原位杂交结果显示视黄酸处理会导致斑马鱼胚胎心脏的前后轴发育异常,表现为vmhc表达细胞的范围缩小,amhc表达细胞的范围明显增大。视黄酸可以明显增强nppa在心脏的表达。视黄酸对心脏房室分化的影响在48hpf后表现得明显。结论5×10-8mol/L和10-7mol/L视黄酸在12.5hpf处理斑马鱼胚胎对斑马鱼心脏早期发生没有影响。斑马鱼发育过程中,视黄酸对心脏的房室分化过程起着重要的调控作用,视黄酸支持心房的分化和发育,同时抑制心室发育。展开更多
文摘Zebrafish is a good vertebrate model for development studies. Research on gene expression and regulation during zebrafish embryonic development plays an important role in revealing the molecular mechanism of morphogenesis in vertebrate. Tubulin locates the cytoplasmic determinants in eggs, organizes the formation of basic cytoskeleton and controls various cell movements. There are several types of tubulin, each of which has specific expression regions and functions. In this study, the full_length cDNA of a Xenopus β 2 tubulin was used as template to generate Dig_labeled antisense RNA which was used as a probe to carry out in situ hybridization on whole mount zebrafish embryos. Under the experimental conditions, the tubulin transcript was first detected in a group of cells in embryos at the midblastula stage. With the development of the embryo, this transcript was gradually restricted to the nervous system. These results demonstrate that the expression of this β 2 tubulin gene in zebrafish embryos is neural specific.
基金supported by the National Natural Science Foundation of China,No.81301080,81671179the Fundamental Research Funds for the Central Universities in China,No.63161215the Natural Science Foundation of Tianjin of China,No.15JCYBJC24400,15JCQNJC10900
文摘Direct exposure to intensive visible light can lead to solar retinopathy, including macular injury. The signs and symptoms include central scotoma, metamorphopsia, and decreased vision. However, there have been few studies examining retinal injury due to intensive light stimulation at the cellular level. Neural network arrangements and gene expression patterns in zebrafish photoreceptors are similar to those observed in humans, and photoreceptor injury in zebrafish can induce stem cell-based cellular regeneration. Therefore, the zebrafish retina is considered a useful model for studying photoreceptor injury in humans. In the current study, the central retinal photoreceptors of zebrafish were selectively ablated by stimulation with high-intensity light. Retinal injury, cell proliferation and regeneration of cones and rods were assessed at 1, 3 and 7 days post lesion with immunohistochemistry and in situ hybridization. Additionally, a light/dark box test was used to assess zebrafish behavior. The results revealed that photoreceptors were regenerated by 7 days after the light-induced injury. However, the regenerated cells showed a disrupted arrangement at the lesion site. During the injury-regeneration process, the zebrafish exhibited reduced locomotor capacity, weakened phototaxis and increased movement angular velocity. These behaviors matched the morphological changes of retinal injury and regeneration in a number of ways. This study demonstrates that the zebrafish retina has a robust capacity for regeneration. Visual impairment and stress responses following high-intensity light stimulation appear to contribute to the alteration of behaviors.
基金Supported by the Open Research Fund Program of Key Laboratory of Marine Drugs(Ocean University of China),Grant of Ministry of Education to X.TAN,KLMD(OUC)200609the National Natural Science Foundation of China(No.30970423)
文摘Proteins of the DYRK(dual-specificity tyrosine-phosphorylation-regulated kinase) family are characterized by the presence of a conserved kinase domain and N-terminal DH box.DYRK2 is involved in regulating key developmental and cellular processes,such as neurogenesis,cell proliferation,cytokinesis,and cellular differentiation.Herein,we report that the ortholog of DYRK2 found in zebrafish shares about 70% identity with that of human,mouse,and chick.RT-PCR showed that DYRK2 is expressed maternally and zygotically.In-situ hybridization results show that DYRK2 is expressed in somite cells that will develop into muscles.Our results provide preliminary evidence for investigating the in-vivo function of DYRK2 in zebrafish muscle development.
文摘目的观察外源性视黄酸对斑马鱼心脏前后轴发育即心脏房室分化的影响。方法采用化学遗传学方法在斑马鱼胚胎发育至12.5hpf(hours post fertilization)给予5×10-8mol/L和10-7mol/L外源性视黄酸处理1.5h。应用胚胎整体原位杂交观察视黄酸对心脏特异基因vmhc,amhc,nkx2.5和nppa表达的影响。结果vmhc,amhc探针的整体原位杂交结果显示视黄酸处理会导致斑马鱼胚胎心脏的前后轴发育异常,表现为vmhc表达细胞的范围缩小,amhc表达细胞的范围明显增大。视黄酸可以明显增强nppa在心脏的表达。视黄酸对心脏房室分化的影响在48hpf后表现得明显。结论5×10-8mol/L和10-7mol/L视黄酸在12.5hpf处理斑马鱼胚胎对斑马鱼心脏早期发生没有影响。斑马鱼发育过程中,视黄酸对心脏的房室分化过程起着重要的调控作用,视黄酸支持心房的分化和发育,同时抑制心室发育。
