促肾上腺皮质激素释放激素基因敲除小鼠的繁殖与基因型鉴定

Reproduction and genotype identification of corticotropin-releasing hormone gene knockout mice

目的探讨促肾上腺皮质激素释放激素(CRH)基因敲除(KO)小鼠饲养、繁殖及基因型鉴定的方法。方法从美国Jackson实验室引进CRH KO小鼠,按照遗传学规则,对杂合子型(CRH+/-)小鼠进行配对繁殖,提取幼鼠尾部组织全基因组DNA,通过聚合酶链反应(PCR)对幼鼠基因型进行鉴定。结果 CRH KO纯合子型(CRH-/-)小鼠的繁殖和饲养均获得成功,采用PCR成功地对所获得的小鼠进行基因分析,在子代小鼠中存在野生纯合子型(CRH+/+)、杂合子型(CRH+/-)及CRHKO纯合子型(CRH-/-)小鼠。CRH-/-小鼠较另外2种基因型小鼠存活率明显下降,但3种基因型小鼠在出生后10 d及30d体质量无明显差异。结论正确的饲养繁殖以及鉴定方法可从杂合子型(CRH+/-)小鼠中获得CRH KO纯合子型(CRH-/-)小鼠。

Objective To explore the methods of breeding,reproductin and genotype identification of corticotropin-releasing hormone（CRH）knockout（KO）mice.Methods CRH knockout mice were obtained from Jackson laboratory in USA.Heterozygous type（CRH＋/-）mice were inbreeded according to genetic rules to yield CRH knockout mice.The genotypes of offspring were identified by polymerase chain reaction（PCR）using genomic DNA extracted from tissue of mice tails.Results Both breeding and reproductin of CRH KO heterozygous type（CRH＋/-）mice were successful.PCR was used successfully for genetic analysis in mice obtained.There were wild homozygous genotype（CRH＋/＋）,heterozygous genotype（CRH＋/-）and CRH KO homozygous genotype（CRH-/-）in the offspring.Compared with other two genotype mice,survival rate of CRH-/-mice were significantly decreased,however,body mass of the three genotypes mice had no significant difference at 10 and 30 days after birth.Conclusion Appropriate reproductin,breeding and identification are effective methods to obtain CRH KO homozygous genotype（CRH-/-）mice from heterozygous genotype（CRH＋/-）mice.