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IRM-2小鼠是我所培育的近交系小鼠品系,我们通过对IRM-2小鼠及其亲本ICR小鼠与615小鼠比较,结果发现,IRM-2小鼠突出的生物学特性是具有较强的辐射抗性[1]。通过mRNA差异显示分析已获得的21条表达序列标签与已知小鼠基因非同源[2],提示IRM-2小鼠体内可能存在辐射抗性相关基因和某种保护机制。本研究从构建的全长IRM-2小鼠cDNA文库[3]测定cDNA克隆的序列,对得到的全长cDNA进行功能鉴定,分析全长cDNA在IRM-2小鼠辐射抗性中发挥的作用,从分子水平上揭示抗辐射特性的本质。
抗辐射小鼠cDNA文库的全长cDNA功能鉴定
The function analysis of full-length cDNA sequence from IRM-2 mouse cDNA library
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摘要:
目的 鉴定IRM-2小鼠cDNA文库的全长cDNA功能。 方法 以IRM-2小鼠的21条表达序列标签为引物进行PCR,从IRM-2小鼠全长cDNA文库中测定cDNA克隆的序列。观察小鼠胚胎成纤维细胞经6.5 Gy γ射线照射后全长cDNA的表达和全长cDNA转染对辐射敏感细胞共济失调性毛细血管扩张症(AT)5B1VA细胞生长的影响。 结果 小鼠胚胎成纤维细胞经照射后,IRM-2小鼠4号、5号和2号cDNA表达水平均高于其亲本ICR小鼠和615小鼠。将全长cDNA转染AT5B1VA细胞,经照射后4号、5号和2号cDNA细胞存活率较高。 结论 IRM-2小鼠4号、5号和2号全长cDNA具有较强的抗辐射功能。 Abstract:Objective To identify the function of full-length cDNA sequence from IRM-2 mouse cDNA library. Methods Full-length cDNA products were amplified by PCR from IRM-2 mouse cDNA library according to twenty-one pieces of expressed sequence tag. The expression of full-length cDNAs were detected after mouse embryonic fibroblasts were exposed to 6.5 Gy γ-ray radiation. And the effect on the growth of radiosensitivity cells AT5B1VA transfected with full-length cDNAs was investigated. Results The expression of No.4, 5 and 2 full-length cDNAs from IRM-2 mouse were higher than that of parental ICR and 615 mouse after mouse embryonic fibroblasts irradiated with γ-ray radiation. And the survival rate of AT5B1VA cells transfected with No.4, 5 and 2 full-length cDNAs was high. Conclusion No.4, 5 and 2 full-length cDNAs of IRM-2 mouse are of high radioresistance. -
Key words:
- Oligonucleotide array sequence analysis /
- Gene library /
- IRM-2 mice
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