Genomic cloning and structural analysis of the murine polymeric receptor (pIgR) gene and promoter region.

Genomic cloning and structural analysis of the murine polymeric receptor (pIgR) gene and promoter region.
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鼠聚合受体 (pIgR) 基因和启动子区域的基因组克隆和结构分析。

DOI:
10.1016/s0378-1119(97)00447-2
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发表时间:
1997
期刊:
影响因子:
3.5
通讯作者:
Wang,J
Wang,J
中科院分区:
生物学3区
文献类型:
--
作者:
Martín,MG;Gutierrez,EM;Lam,JT;Li,TW;Wang,J

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聚合物受体(pIgR)的作用是转运聚合物伊加穿过各种粘膜上皮层。尽管已经克隆了包括小鼠在内的几种哺乳动物的pIgR cDNA,但人类的基因组结构仅得到部分分析,其5′上游区域和转录起始位点均未知。我们报告的小鼠pIgR基因的分离和表征,跨越32 kb,包含11个外显子。小鼠基因的一般结构,包括其内含子/外显子边界与其人类同源物相似;然而,第二个内含子在小鼠中为7.2kb,而在人类中仅为0.8kb。引物延伸和5′-RACE独立鉴定了相同的转录起始位点。对5′-侧翼区350个碱基对的序列分析显示了几个基序,包括TATA盒,以及推测的干扰素-γ,HNF-3β和AP 1位点。总之,我们已经分离了鼠pIgR基因,并描述了它的结构和组织。
The role of the polymeric receptor (pIgR) is to transport polymeric IgA across various mucosal epithelial layers. Although several mammalian pIgR cDNAs, including mouse, have been cloned, genomic structure has only been partially analyzed in the human, and neither its 5′-upstream region nor its transcriptional start site is known. We report the isolation and characterization of the murine pIgR gene that spans 32kb and contains 11 exons. The general organization of the murine gene, including its intron/exon boundaries was similar to its human homolog; however, the second intron was 7.2kb in the mouse vs. only 0.8kb in humans. Primer extension and 5′-RACE independently identified the identical transcriptional initiation site. Sequence analysis of 350 base pairs in the 5′-flanking region revealed several motifs, including a TATA box, and putative interferon-γ, HNF-3β and AP1 sites. In summary, we have isolated the murine pIgR gene and described its structure and organization.
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