eprintid: 10100244
rev_number: 8
eprint_status: archive
userid: 695
dir: disk0/10/10/02/44
datestamp: 2020-06-10 08:39:22
lastmod: 2020-06-10 08:39:22
status_changed: 2020-06-10 08:39:22
type: thesis
metadata_visibility: show
creators_name: Marden, Chloe Maria
title: Functional analysis of the p47phox gene promoter
ispublished: unpub
keywords: Biological sciences
note: Thesis digitised by ProQuest.
abstract: Defects in the p47phox gene that encodes a cytosolic component of the phagocytic NADPH oxidase complex are responsible for the majority of cases of autosomal recessive Chronic Granulomatous Disorder (AR-CGD). Somatic gene therapy for p47phox-deficient AR-CGD requires regulated, sustainable expression of in cells affected by CGD. This thesis investigated regulation of the gene with the ultimate aim of constructing a retroviral vector that incorporates p47phox regulatory sequence. Myeloid and non-myeloid cell lines were transfected with CAT reporter gene constructs containing 57-3100 base pairs (bp) of the p47phox 5' promoter. Assay of CAT activity in stable transfectants demonstrated that -3100bp promoter was insufficient to direct fully regulated expression. However, an inhibitory region located upstream of position -500, and proximal sequence (-143bp) sufficient for the direction of significant expression in myeloid cells were identified. Mutation analysis demonstrated that an interferon-stimulated response element (ISRE) located between positions -103 and -116 and a consensus binding site for the Ets family transcription factor PU.1 located between positions -38 and -43 were required for optimal expression in myeloid cells. Electrophoretic mobility shift assay (EMSA) demonstrated myeloid and B-cell-specific binding of PU.1 at the consensus binding site. EMSA revealed that PU.1 bound as four distinct species in a cell-type-specific pattern that altered significantly in response to myeloid differentiation. Phosphatase treatment of nuclear extract suggested that PU.1 EMSA complexes were differentially phosphorylated. Based on the results of functional and protein binding studies, a -143bp p47phox promoter fragment containing ISRE and PU.1 motifs was incorporated into a U3-deleted retroviral vector and stably transfected into a retroviral packaging line to produce a replication-deficient p47phox CAT reporter retrovirus. Transduction of myeloid and non-myeloid cell lines resulted in significant CAT reporter gene activity in myeloid cells.
date: 1999
oa_status: green
full_text_type: other
thesis_class: doctoral_open
thesis_award: Ph.D
language: eng
thesis_view: UCL_Thesis
primo: open
primo_central: open_green
verified: verified_manual
full_text_status: public
pages: 313
institution: UCL (University College London)
thesis_type: Doctoral
citation:        Marden, Chloe Maria;      (1999)    Functional analysis of the p47phox gene promoter.                   Doctoral thesis  (Ph.D), UCL (University College London).     Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10100244/1/out.pdf