Identification of a ubiquitously active promoter of the murine activation-induced cytidine deaminase (AICDA) gene.

Identification of a ubiquitously active promoter of the murine activation-induced cytidine deaminase (AICDA) gene.
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鉴定小鼠激活诱导胞苷脱氨酶 (AICDA) 基因的普遍活性启动子。

DOI:
10.1016/j.molimm.2005.05.007
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发表时间:
2006
影响因子:
3.6
通讯作者:
Livak,Ferenc
Livak,Ferenc
中科院分区:
医学3区
文献类型:
--
作者:
Yadav,Anjana;Olaru,Alexandru;Saltis,Mark;Setren,Adam;Cerny,Jan;Livak,Ferenc

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免疫球蛋白基因的体细胞超突变和类别转换重组依赖于激活诱导的胞苷脱氨酶(AICDA)的存在。AICDA表达仅限于生发中心的活化B淋巴细胞。已经表明,AICDA的不适当表达可能导致基因组不稳定性和推定的自身反应性抗体的异常亲和力成熟。为了更好地了解其严格调控的表达的分子控制,我们已经确定了转录起始位点和上游,保守的启动子区的小鼠AICDA基因。启动子缺乏共识TATA盒,但含有一个启动子(Inr)元件,并在几个鼠和人细胞系中有活性,而与内源性AICDA表达无关。突变分析确定了一个功能上重要的SP结合位点,它在体外所有细胞类型中都能结合Sp1和Sp3。与最近的一份报告相反,没有证据表明Pax5在这个DNA位点直接结合。我们讨论了普遍存在的和淋巴细胞特异性因子在AICDA基因转录控制中的作用。
Somatic hypermutation and class switch recombination of immunoglobulin genes are dependent on the presence of the activation-induced cytidine deaminase (AICDA) enzyme. AICDA expression is restricted to activated B-lymphocytes in the germinal centers. It has been suggested that inappropriate expression of AICDA may lead to genome instability and aberrant affinity maturation of putative autoreactive antibodies. To better understand the molecular control of its tightly regulated expression we have identified the transcription initiation site and an upstream, conserved promoter region of the murine AICDA gene. The promoter lacks a consensus TATA box but contains an initiator (Inr) element and is active in several murine and human cell lines irrespective of endogenous AICDA expression. Mutagenesis analysis identified a functionally important Sp-binding site which binds both Sp1 and Sp3 in vitro in all cell types. Contrary to a recent report, no evidence was found for direct Pax5-binding at this DNA site. We discuss the role of ubiquitous and lymphoid-specific factors in the control of AICDA gene transcription.
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