Alan W. Hart

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The X-linked gene filamin A (Flna) encodes a widely expressed actin-binding protein that crosslinks actin into orthogonal networks and interacts with a variety of other proteins including membrane proteins, integrins, transmembrane receptor complexes and second messengers, thus forming an important intracellular signalling scaffold. Heterozygous loss of(More)
PURPOSE To identify the underlying molecular defects causing retinal degeneration in seven N-ethyl-N-nitrosourea (ENU) induced mutant alleles of the Pde6b gene and to analyze the timescale of retinal degeneration in these new models of retinitis pigmentosa. METHODS Conformation sensitive capillary electrophoresis and DNA sequencing were used to identify(More)
The objective of these studies was to evaluate human insulin gene expression following intramuscular plasmid injection in non-diabetic rats as a potential approach to gene therapy for diabetes mellitus avoiding the need for immunosuppression. A wild-type human preproinsulin construct and a mutant construct in which PC2/PC3 sites were engineered to form(More)
PURPOSE A mouse mutant identified during a recessive N-ethyl-N-nitrosourea (ENU) mutagenesis screen exhibited ocular hemorrhaging resulting in a blood-filled orbit, and hence was named "redeye." We aimed to identify the causal mutation in redeye, and evaluate it as a model for diabetic retinopathy (DR). METHODS The causative gene mutation in redeye was(More)
In order to purify and characterize nestin-positive cells in the developing pancreas a transgenic mouse was generated, in which the enhanced green fluorescent protein (EGFP) was driven by the nestin second intronic enhancer and upstream promoter. In keeping with previous studies on the distribution of nestin, EGFP was expressed in the developing embryo in(More)
The transcription factor Pax6 is a developmental regulator with a crucial role in development of the eye, brain, and olfactory system. Pax6 is also required for correct development of the endocrine pancreas and specification of hormone producing endocrine cell types. Glucagon-producing cells are almost completely lost in Pax6-null embryos, and(More)
Idiopathic clubfoot (Talipes Equinovarus) affects 1 in 500 UK births, but its aetiology is very poorly understood, with both genetic and environmental components. We investigated the developmental and genetic basis of clubfoot in a mouse model, and provide evidence that clubfoot is a neuromuscular defect. Although the tibial branch of the sciatic nerve(More)
PURPOSE Mutations in the retinitis pigmentosa (RP) GTPase regulator (RPGR) gene account for more than 70% of X-linked RP cases. This study aims to characterize the proximal promoter region of the human RPGR gene. METHODS The 5'-flanking region (5 kb) of human RPGR was cloned and sequenced. A potential transcription start site and transcription factor(More)
Neurogenin 3 (ngn3) is a basic helix loop helix transcription factor that is transiently expressed in the developing mouse pancreas with peak expression around E15. In mice lacking the ngn3 gene the endocrine cells of the pancreas fail to develop suggesting that the ngn3-positive cell may represent a progenitor cell for the endocrine pancreas. In order to(More)
Dilp1 is a semi-dominant mouse mutation that causes dilated pupils when heterozygous and is lethal when homozygous. We report here that it is caused by a point mutation that introduces a stop codon close to the start of the coding sequence of the paired-like homeobox transcription factor Phox2b. Mice carrying a targeted allele of Phox2b also have dilated(More)