GRP94 is encoded by two differentially expressed genes during development of rainbow trout (Oncorhynchus mykiss)

GRP94 is encoded by two differentially expressed genes during development of rainbow trout (Oncorhynchus mykiss)
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GRP94 在虹鳟 (Oncorhynchus mykiss) 发育过程中由两个差异表达基因编码

DOI:
10.1007/s10695-014-9979-7
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发表时间:
2014
影响因子:
2.9
通讯作者:
Seyfert HM
Seyfert HM
中科院分区:
农林科学3区
文献类型:
--
作者:
Rebl A;Brietzke A;Goldammer T;Seyfert HM

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葡萄糖调节蛋白 94 kDa (GRP94) 是一种内质网 (ER) 定位的热休克蛋白,除其他功能外,它在 Toll 样受体 (TLR) 和其他一些免疫相关因子的折叠和输出中发挥着至关重要的作用。我们在虹鳟鱼中鉴定出 GRP94 编码基因的两个拷贝,它们具有 91% 的 DNA 序列同一性。概念上翻译的 ORF 分别编码 795-aa GRP94a 和 510-aa GRP94b 蛋白变体,具有特征结构域和氨基酸残基。然而,较短的变体缺乏其在 ER 中定位所需的基序,因此可能代表假定的哺乳动物直系同源物 GRP94a 的亚型。据哺乳动物报道,热应激仅轻微影响鳟鱼两个编码 GRP94 基因的表达。我们记录了编码 GRP94 变体以及代表其潜在靶标的广泛 TLR 组的转录本丰度。在胚胎和幼鱼鳟鱼中,仅编码 TLR1、-2、-9 和 -20 的 mRNA 被发现具有显着浓度,而其他 9 个 TLR 的表达几乎检测不到。 GRP94a 编码基因表现出持续的高表达水平,表明该异构体在虹鳟鱼的整个生命周期中至关重要。与 GRP94a mRNA 水平相比,GRP94b 编码 mRNA 的浓度仅为 ~0.1%。这些结构和基因表达数据共同表明两种 GRP94 基因产物发挥不同的生理作用。
The glucose-regulated protein, 94 kDa (GRP94), is an endoplasmic reticulum (ER)-localized heat shock protein that plays among other functions a crucial role in folding and exports of Toll-like receptors (TLRs) and some other immune-relevant factors. We identified two copies of the GRP94-encoding gene in rainbow trout sharing 91 % DNA sequence identity. The conceptually translated ORFs encode a 795-aa GRP94a and a 510-aa GRP94b protein variant, respectively, with characteristic domains and amino acid residues. However, the shorter variant lacks motifs required for its localization in the ER and might thus represent an isoform of the putative mammalian ortholog GRP94a. Heat stress only slightly affects the expression of the two GRP94-encoding trout genes, as reported for mammals. We recorded the abundances of transcripts coding for both GRP94 variants as well as for a broad panel of TLRs representing their potential targets. In embryonic and larval trout, only the mRNAs encoding TLR1, −2, −9, and −20 were found in significant concentrations, while the expression of nine other TLRs was hardly detectable. The GRP94a-encoding gene showed constantly high expression levels indicating that this isoform is vitally required throughout the life cycle of rainbow trout. The concentration of the GRP94b-encoding mRNA was only ~0.1 % compared to the GRP94a mRNA level. These structural and gene expression data together suggest that the two GRP94 gene products fulfill different physiological roles.
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