Diseases that impair kidney function, both inherited and acquired, represent a major medical problem. This proposal is designed to further our understanding at the molecular level of normal kidney development and function and to identify perturbations that occur in disease states by studying the expression of transcription factors that are highly expressed in specific subsets of kidney cells.
The specific aims and methods to be used are:
(AIM 1). To determine the biological function of the two major isoforms of WT1 by identifying targets of regulation by this transcription factor. Reverse transcription and polymerase chain reaction will be used to identify genes that are either induced or repressed in stable transfectants that overexpress WT1 protein. The putative targets identified by the approach will be further characterized by northern analysis and RNA in situ hybridization ina variety of cell lines, normal fetal kidney and Wilms tumors to determine which of these genes are most likely to be important in nephrogenesis and the process of Wilms tumorigenesis.
(AIM) 2). To determine the biological function of the two major isoforms of WT1 by identifying targets of regulation by this transcription factor. Reverse transcription and polymerase chain reaction will be used to identify genes that are either induced or repressed in stable transfectants that overexpress WT1 protein. The putative targets identified by this approach will be further characterized by northern analysis and RNA in situ hybridization in a variety of cell lines, normal fetal kidney and Wilms tumors to determine which of these genes are most likely to be important in nephrogenesis and the process of Wilms tumorigenesis., (AIM 2). To characterize Tbx2, a member of a new family of putative transcription factors that is expressed in lung and kidney by a) studying its pattern of expression in fetal and adult tissues and b) determining its cellular function through in vivo and in vitro tbx2 expression studies. Tbx2 is expressed in fetal and adult kidney an lung and exhibits striking homology within its putative DNA binding domain to the DNA binding domain of several other murine and drosophila genes. The research design entails a) the identification of the subset of kidney cells expressing Tbx2 by RNA in situ hybridization and immunocytochemistry, b) the use of gel mobility shift assays to define the specific DNA sequences that are bound by the Tbx2 protein and the use of transient transfection assays with reporter constructs to demonstrate that Tbx2 encodes a transcription factor.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
1R01DK048796-01A1
Application #
2149252
Study Section
Pathology A Study Section (PTHA)
Project Start
1995-08-01
Project End
1998-07-31
Budget Start
1995-08-01
Budget End
1996-07-31
Support Year
1
Fiscal Year
1995
Total Cost
Indirect Cost
Name
Cleveland Clinic Lerner
Department
Type
DUNS #
017730458
City
Cleveland
State
OH
Country
United States
Zip Code
44195
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Wong, Yong Wee; Schulze, Christian; Streichert, Thomas et al. (2007) Gene expression analysis of nuclear factor I-A deficient mice indicates delayed brain maturation. Genome Biol 8:R72
Butz, Nataliya V; Gronostajski, Richard M; Campbell, Christine E (2006) T-box proteins differentially activate the expression of the endogenous interferon gamma gene versus transfected reporter genes in non-immune cells. Gene 377:130-9
Butz, Nataliya V; Campbell, Christine E; Gronostajski, Richard M (2004) Differential target gene activation by TBX2 and TBX2VP16: evidence for activation domain-dependent modulation of gene target specificity. Gene 342:67-76
Murtagh, Janice; Martin, Finian; Gronostajski, Richard M (2003) The Nuclear Factor I (NFI) gene family in mammary gland development and function. J Mammary Gland Biol Neoplasia 8:241-54
Carlson, H; Ota, S; Campbell, C E et al. (2001) A dominant repression domain in Tbx3 mediates transcriptional repression and cell immortalization: relevance to mutations in Tbx3 that cause ulnar-mammary syndrome. Hum Mol Genet 10:2403-13
Sinha, S; Abraham, S; Gronostajski, R M et al. (2000) Differential DNA binding and transcription modulation by three T-box proteins, T, TBX1 and TBX2. Gene 258:15-29
Seppala, R; Lehto, V P; Gahl, W A (1999) Mutations in the human UDP-N-acetylglucosamine 2-epimerase gene define the disease sialuria and the allosteric site of the enzyme. Am J Hum Genet 64:1563-9
He, M l; Wen, L; Campbell, C E et al. (1999) Transcription repression by Xenopus ET and its human ortholog TBX3, a gene involved in ulnar-mammary syndrome. Proc Natl Acad Sci U S A 96:10212-7
Chaudhry, A Z; Vitullo, A D; Gronostajski, R M (1998) Nuclear factor I (NFI) isoforms differentially activate simple versus complex NFI-responsive promoters. J Biol Chem 273:18538-46

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