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The Human NGFI-B Gene Gives Rise to Two Isoforms with Different Expression Profiles

机译:人类NGFI-B基因使两种具有不同表达谱的同工型升高

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摘要

NGFI-B is an immediate-early gene that belongs to the steroid/thyroid receptor superfamily. In this study, we cloned and characterized a human NGFI-B isoform designated NGFI-B2, which has a unique 5'-untranslated region and which lacks C-terminal amino acid sequences corresponding to the putative ligand-binding or dimerizing domain. The NGFI-B and NGFI-B2 mRNAs are differentially expressed in human tissued. To study the transcriptional regulation of these isoforms, we examined the effects of forskolin and 12-0-tetradecanoyl-phorbol-13-acetate (TPA) on their expression in human neuroblastoma and breast cancer cells. NGFI-B, but not NGFI-B2 transcripts were rapidly induced, suggesting that NGFI-B2 is not associated with the immediate-early response. The expression and regulation of the NGFI-B isoforms suggested that they are expressed by separate promoters, and that they play different roles in biological processes.
机译:NGFI-B是一种早期激素基因,属于类固醇/甲状腺受体超家族。在这项研究中,我们克隆并鉴定了命名为NGFI-B2的人NGFI-B同工型,该同工型具有独特的5'非翻译区,并且缺少对应于假定的配体结合或二聚结构域的C末端氨基酸序列。 NGFI-B和NGFI-B2 mRNA在人体组织中差异表达。为了研究这些同工型的转录调控,我们研究了福司可林和12-0-十四烷酰基-phorbol-13-乙酸盐(TPA)对它们在人神经母细胞瘤和乳腺癌细胞中表达的影响。 NGFI-B,但不是NGFI-B2转录物被快速诱导,这表明NGFI-B2与立即早期反应无关。 NGFI-B亚型的表达和调控表明它们由单独的启动子表达,并且它们在生物学过程中起不同的作用。

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