title: Identification and functional analysis of variant haplotypes in the 5'-flanking region of protein phosphatase 2A-Bδ gene.
abstract: Serine-threonine protein phosphatase 2A (PP2A) is a trimeric holoenzyme that plays an integral role in the regulation of cell growth, differentiation, and apoptosis. The substrate specificity and (sub)cellular localization of the PP2A holoenzymes are highly regulated by interaction with a family of regulatory B subunits (PP2A-Bs). The regulatory subunit PP2A-B/PR55δ (PP2A-Bδ) is involving in the dephosphorylation of PP2A substrates and is crucial for controlling entry into and exit from mitosis. The molecular mechanisms involved in the regulation of expression of PP2A-Bδ gene (PPP2R2D) remain largely unknown. To explore genetic variations in the 5'-flanking region of PPP2R2D gene as well as their frequent haplotypes in the Han Chinese population and determine whether such variations have an impact on transcriptional activity, DNA samples were collected from 70 healthy Chinese donors and sequenced for identifying genetic variants in the 5'-flanking region of PPP2R2D. Four genetic variants were identified in the 1836 bp 5'-flanking region of PPP2R2D. Linkage disequilibrium (LD) patterns and haplotype profiles were constructed for the genetic variants. Using serially truncated human PPP2R2D promoter luciferase constructs, we found that a 601 bp (-540 nt to +61 nt) fragment constitutes the core promoter region. The subcloning of individual 5'-flanking fragment revealed the existence of three haplotypes in the distal promoter of PPP2R2D. The luciferase reporter assay showed that different haplotypes exhibited distinct promoter activities. The EMSA revealed that the -462 G>A variant influences DNA-protein interactions involving the nuclear factor 1 (NF1). In vitro reporter gene assay indicated that cotransfection of NF1/B expression plasmid could positively regulate the activity of PPP2R2D proximal promoter. Introduction of exogenous NF1/B expression plasmid further confirmed that the NF1 involves in the regulation of PPP2R2D gene expression. Our findings suggest that functional genetic variants and their haplotypes in the 5'-flanking region of PPP2R2D are critical for transcriptional regulation of PP2A-Bδ.
authors.affiliation: Faculty of Preventive Medicine, Guangdong Provincial Key Laboratory of Food, Nutrition and Health, School of Public Health, Sun Yat-sen University, Guangzhou, People's Republic of China.
authors.forename: Hui-Feng
authors.initials: HF
authors.lastname: Chen
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Lin
authors.forename: Yu-Xi
authors.initials: YX
authors.lastname: Chen
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Wan
authors.forename: Jie
authors.initials: J
authors.lastname: Luo
authors.forename: Chen-Zi
authors.initials: CZ
authors.lastname: Zhang
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Li
authors.forename: Yao-Ming
authors.initials: YM
authors.lastname: Hu
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Mai
authors.forename: Wen
authors.initials: W
authors.lastname: Chen
authors.forename: Zhong-Ning
authors.initials: ZN
authors.lastname: Lin
authors.forename: Yu-Chun
authors.initials: YC
authors.lastname: Lin
mesh_terms: D024506:5' Flanking Region; D000483:Alleles; D030541:Databases, Genetic; D014644:Genetic Variation; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D051839:NFI Transcription Factors / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D054648:Protein Phosphatase 2 / Q000235:genetics* / Q000378:metabolism
chemical_list: D051839:NFI Transcription Factors; C080333:transcription factor nuclear factor 1; D054648:Protein Phosphatase 2