the 5′ flanking region and intron1 of the bovine prion protein gene (prnp) are responsible for negative feedback regulation of the prion protein的5u2032侧翼地区和intron1牛朊蛋白基因(prnp)负责负反馈调节的朊病毒蛋白.pdf
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The 5 9 Flanking Region and Intron1 of the Bovine Prion
Protein Gene (PRNP) Are Responsible for Negative
Feedback Regulation of the Prion Protein
1,2 2 1 3
Guangai Xue , Yoko Aida , Takashi Onodera , Akikazu Sakudo *
1 Department of Molecular Immunology, School of Agricultural and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan, 2 Viral Infectious Diseases Research Unit,
RIKEN, 2-1 Hirosawa, Wako, Saitama, Japan, 3 Laboratory of Biometabolic Chemistry, School of Health Sciences, Faculty of Medicine, University of the Ryukyus, Nishihara,
Okinawa, Japan
Abstract
Transcription factors regulate gene expression by controlling the transcription rate. Some genes can repress their own
expression to prevent over production of the corresponding protein, although the mechanism and significance of this
negative feedback regulation remains unclear. In the present study, we describe negative feedback regulation of the bovine
prion protein (PrP) gene PRNP in Japanese Black cattle. The PrP-expressing plasmid pEF-boPrP and luciferase-expressing
plasmids containing the partial promoter fragment of PRNP incorporating naturally occurring single-nucleotide or insertion/
deletion polymorphisms were transfected into N2a cells. Transfection of pEF-boPrP induced PrP overexpression and
decreased the promoter activity of PRNP in the wild-type haplotype (23-bp Del, 12-bp Del, and 247C). Reporter gene assays
further demonstrated that the 12- and 23-bp Ins/Del polymorphisms, which are thought to be associated with Sp1 (Specific
protein 1) and RP58 (Repressor Protein with a predicted molecular mass of 58 kDa), in intron1 and the upstream region,
respectively, and an additional polymorphism (247CRA) in th
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