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Constitutive expression of a stress-inducible heat shock protein gene, hsp70, in phylogenetically distant Antarctic fish

机译:压力诱导型热休克蛋白基因hsp70在系统发育距离较远的南极鱼中的组成型表达

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摘要

Previous research on Antarctic notothenioid fishes demonstrated the loss of the heat-shock response characterized by the rapid synthesis of molecular chaperones in response to increasing pools of damaged proteins. We determined that this loss was the result of constitutive expression of the inducible hsp70 gene. In this study, we examined the extent of this unique expression pattern in Antarctic fish by comparing the expression of two genes, the constitutive hsc71 gene and the inducible hsp70 gene, in tissues from Trematomus bernacchii to expression in tissues of Pagothenia borchgrevinki, a second Antarctic notothenioid, and Lycodichthys dearborni, a phylogenetically distant Antarctic species. Our study indicated that the expression of hsc71 is similar in all species; however, the constitutive expression of the inducible hsp70 gene was also manifested in these species. These data further suggest that cold denaturation of proteins at ecologically relevant temperatures may be contributing to this change in expression of the hsp70 gene.
机译:先前对南极类胡萝卜素鱼类的研究表明,热激响应的丧失以分子伴侣迅速合成为特征,响应于受损蛋白质库的增加。我们确定这种损失是可诱导的hsp70基因组成型表达的结果。在这项研究中,我们通过比较两个基因,即组成性hsc71基因和可诱导性hsp70基因在伯纳德Trematomus bernacchii组织中的表达以及在第二个南极州Pagothenia borchgrevinki组织中的表达,研究了南极鱼这种独特表达模式的程度。类胡萝卜素和Lycodichthys dearborni,一种在系统发育上遥远的南极物种。我们的研究表明,hsc71在所有物种中的表达都相似。然而,诱导型hsp70基因的组成型表达也出现在这些物种中。这些数据进一步表明,在生态上相关的温度下蛋白质的冷变性可能是hsp70基因表达变化的原因。

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