为了克隆变态早期牙鲆头部差异表达的基因,采用抑制差减杂交法,以变态前的仔鱼头部表达的RNA作为驱动RNA,建立了牙鲆变态早期的差减cDNA文库,并利用相对定量RT-PCR对其进行了筛选。差减库的平均插入片段558bp左右,阳性率为81.8%。随机...为了克隆变态早期牙鲆头部差异表达的基因,采用抑制差减杂交法,以变态前的仔鱼头部表达的RNA作为驱动RNA,建立了牙鲆变态早期的差减cDNA文库,并利用相对定量RT-PCR对其进行了筛选。差减库的平均插入片段558bp左右,阳性率为81.8%。随机测定的45个克隆,在剔除假阳性克隆后,共得到22个不同的基因,其中13个为已知cDNA的同源基因,而另外9个为已知蛋白的同源基因,分别为prolactin receptor-like,COL1A1,M-3muscarinic receptor,Sfrs3,tropomyosin,ribosomal protein L27,ribosomal protein S12,GAPDH,COL1A3。在所有22个基因中,COL1A1基因在差减库中的分布频率最高,为22.2%。RT-PCR检测结果表明,在所检测的11个基因中,所有基因在右眼移动前后的牙鲆头部均有表达,只是体现在表达水平上的不同。展开更多
Homeostasis of platelet number in human and other mammals is well maintained for prevention of minor bleeding and for other im- munological functions, but the exact molecular mechanism responsible for immune thrombocy...Homeostasis of platelet number in human and other mammals is well maintained for prevention of minor bleeding and for other im- munological functions, but the exact molecular mechanism responsible for immune thrombocytopenic purpura （ITP） has not been fully understood. In an effort to identify genetic factors involved in initiation of platelet production in response to bleeding injury or platelet destruction, we have successfully generated an animal model of human ITP via intraperitoneal injection of anti-platelet antibody into the Balb/c mouse. Platelet counts were dropped dramatically in animals that received antibody injection within 4 h, maintained at the mini- mum level for a period of 44 h, started to rebound after 48 h, and reached to the maximum at 144 h （6 days）. Final homeostasis reached at approximately 408 h （17 days）, following a minor cycle of platelet number fluctuation. Using semi-quantitative RT-PCR, we assessed and compared mRNA level of CD41, c-myb, c-mpl, caspase-3, caspase-9, GATA-1, and Bcl-xl in bone marrow and spleen. Alteration of mRNA expression was correlated with the change of platelet level, and an inverse relationship was found for expression of the genes be- tween bone marrow and spleen. No transcription was detectable for any of the seven genes in bone marrow at the time when platelet number reached the maximum （144 h）. In contrast, mRNA transcripts of the seven genes were found to be at the highest level in spleen tissue. This is the first study of simultaneous detection of multiple platelet related genes in a highly reproducible ITP animal model. Our results provided the supportive evidence that expression of the above seven genes are more related to negative regulation of platelet number in spleen tissue, at least in the model animals.展开更多
文摘为了克隆变态早期牙鲆头部差异表达的基因,采用抑制差减杂交法,以变态前的仔鱼头部表达的RNA作为驱动RNA,建立了牙鲆变态早期的差减cDNA文库,并利用相对定量RT-PCR对其进行了筛选。差减库的平均插入片段558bp左右,阳性率为81.8%。随机测定的45个克隆,在剔除假阳性克隆后,共得到22个不同的基因,其中13个为已知cDNA的同源基因,而另外9个为已知蛋白的同源基因,分别为prolactin receptor-like,COL1A1,M-3muscarinic receptor,Sfrs3,tropomyosin,ribosomal protein L27,ribosomal protein S12,GAPDH,COL1A3。在所有22个基因中,COL1A1基因在差减库中的分布频率最高,为22.2%。RT-PCR检测结果表明,在所检测的11个基因中,所有基因在右眼移动前后的牙鲆头部均有表达,只是体现在表达水平上的不同。
文摘Homeostasis of platelet number in human and other mammals is well maintained for prevention of minor bleeding and for other im- munological functions, but the exact molecular mechanism responsible for immune thrombocytopenic purpura （ITP） has not been fully understood. In an effort to identify genetic factors involved in initiation of platelet production in response to bleeding injury or platelet destruction, we have successfully generated an animal model of human ITP via intraperitoneal injection of anti-platelet antibody into the Balb/c mouse. Platelet counts were dropped dramatically in animals that received antibody injection within 4 h, maintained at the mini- mum level for a period of 44 h, started to rebound after 48 h, and reached to the maximum at 144 h （6 days）. Final homeostasis reached at approximately 408 h （17 days）, following a minor cycle of platelet number fluctuation. Using semi-quantitative RT-PCR, we assessed and compared mRNA level of CD41, c-myb, c-mpl, caspase-3, caspase-9, GATA-1, and Bcl-xl in bone marrow and spleen. Alteration of mRNA expression was correlated with the change of platelet level, and an inverse relationship was found for expression of the genes be- tween bone marrow and spleen. No transcription was detectable for any of the seven genes in bone marrow at the time when platelet number reached the maximum （144 h）. In contrast, mRNA transcripts of the seven genes were found to be at the highest level in spleen tissue. This is the first study of simultaneous detection of multiple platelet related genes in a highly reproducible ITP animal model. Our results provided the supportive evidence that expression of the above seven genes are more related to negative regulation of platelet number in spleen tissue, at least in the model animals.
