Overexpression of a Zebrafish ARNT2-like Factor Represses CYP1A Transcription in ZLE Cells

Overexpression of a Zebrafish ARNT2-like Factor Represses CYP1A Transcription in ZLE Cells
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斑马鱼 ARNT2 样因子的过度表达抑制 ZLE 细胞中 CYP1A 转录

DOI:
10.1007/s101260000001
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发表时间:
2000
影响因子:
3
通讯作者:
Chin
Chin
中科院分区:
生物学2区
文献类型:
--
作者:
Wen;Jun;H. Hsu;Z. Kong;Chin

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摘要:芳烃受体核转位因子(ARNT)是一类新的碱性螺旋环螺旋PAS(bHLH-PAS)转录因子家族,它控制着多种生理和发育过程。在先前的研究中,我们通过逆转录-聚合酶链反应从斑马鱼胚胎、肝脏和其他组织中获得了ARNT 2样因子的部分互补DNA片段。为了研究该因子的功能,我们筛选了一个胚胎互补DNA文库,并获得了该ARNT 2样因子zARNT 2A的完整cDNA。zARNT 2A的蛋白质序列包括基本螺旋-环-螺旋和PAS-A/B基序,与小鼠ARNT 2因子的氨基端部分具有最高的序列相似性。然而,其在PAS-A/B基序之后缺乏羧基末端反式激活基序。zARNT 2A在培养细胞中的瞬时表达导致TCDD依赖性CYP 1A转录的抑制。整体原位杂交结果显示zARNT 2A在孕5期的脑和前肾中表达。在成鱼中,zARNT 2A信使RNA在广泛的组织中转录,表明zARNT 2A及其相应的信号转导机制在鱼类发育等生理方面具有重要作用。
Abstract: Aryl hydrocarbon receptor nuclear translocator (ARNT) factors belong to a novel basic-helix-loop-helix–PAS (bHLH-PAS) transcription factor family that controls a variety of physiological and developmental processes. In a previous study, we obtained a partial complementary DNA fragment of an ARNT2-like factor from zebrafish embryo, liver, and other tissues by reverse transcription–polymerase chain reaction. In an effort to characterize the function of this factor, we screened an embryonic complementary DNA library and obtained a complete cDNA of this ARNT2-like factor, zARNT2A. The deduced protein sequence of zARNT2A encompasses the basic-helix-loop-helix and PAS-A/B motifs and shares highest sequence similarity with the amino-terminal half of mouse ARNT2 factor. However, it lacks a carboxy-terminal transactivation motif following the PAS-A/B motifs. Transient expression of zARNT2A in cultured cells resulted in repression of TCDD-dependent CYP1A transcription. Whole-mount in situ hybridization revealed that zARNT2A is expressed in brain and pronephros at prime-5 stages. In adult fish, zARNT2A messenger RNA is transcribed in a wide range of tissues, which indicates that zARNT2A and its corresponding signal transduction mechanisms have important roles in fish development and other physiological aspects.
脊椎动物 ARNT 蛋白的功能多样性:将 ARNT2 鉴定为海洋硬骨鱼、异斜眼底 ARNT 的主要形式。
DOI: 10.1006/abbi.1998.0992
发表时间: 1999
影响因子: 3.9
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影响因子: 11.1
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