黑线仓鼠及其白化突变系肌张力异常蛋白变体X1基因的克隆与序列分析研究

Cloning and sequence analysis of dystonin(Dst) variant X1 in Cricetulusbarabensis and albino mutant Cricetulusbarabensis

目的将黑线仓鼠及其白化突变系肌张力异常蛋白变体X1基因编码区进行序列比对分析,试揭示黑线仓鼠及其白化突变系肌张力异常蛋白变体X1基因编码区之间是否存在变异。方法根据小鼠与大鼠的同种型肌张力异常蛋白变体X1段基因设计6对引物,采用RT-PCR的方法,从黑线仓鼠及其白化系皮肤中扩增得到cDNA基因,并对其二者进行克隆测序。结果将由RT-PCR方法获得的基因序列进行比对后可知,二者编码区共有17处差异,氨基酸差异共24处,但无关键核酸蛋白出现变异现象。结论黑线仓鼠白化突变系白化性状产生,并不是由肌张力异常蛋白变体X1的这段基因编码区突变造成的,其白化性状产生的机制尚需要进一步的研究。

Objective To clone and sequence the dystonin variant X1 gene of Cricetulusbarabensis and the albino mutant Cricetulusbarabensis so as to find out the difference of encoding arear of the muscular ribosome between Cricetulusbarabensis and the albino mutant Cricetulusbarabensis. Methods According to the same type of abnormal muscle tone protein of the mice and rats,we designed 6 pairs of primers, and got their cDNA genes from skins of the Cricetulusbarabensis and the albino mutant Cricetulusbarabensis by RT-PCR amplification, then cloned and sequenced. Results Sequence alignment showed 17 variances in coding areas, and 24 in amino acid, but no in key nucleic acid and protein. Conclusion The variances in coding areas will not lead to the albino, and its mechanism requires further investigation.