This proposal requests continuation of support for a combined neurochemical and histochemical study of the genetic regulation and development of the dopamine-containing neurons in the brain. The work is focused on a mutant allele that discriminates in its action among the brain's dopaminergic neurons with a striking regional specificity. The genetic mutation to be examined is weaver, an autosomal recessive mutation in mouse in which striatal and nonstriatal targets of the mesotelencephalic dopamine-containing systems are affected or not in a pattern with strict boundaries reproducible in homozygous weaver animals. The pattern strongly suggests separable control of mesolimbic and nigrostriatal systems. Our developmental studies show that this control is exerted during early postnatal life. The gene exerts its effects within a limited developmental period, shows gene dose- dependence and regional specificity. These features are in common with the defect that this gene exerts on a seemingly unrelated population of cells, the cerebellar granule cells.
The aims of the proposal are focused on the role of the dopamine- containing innervation in the development of the striatum, the features that distinguish spared and affected populations of dopamine-containing cells in the weaver mutant, how the genetic control of these subsets of dopamine neurons is regulated, and the definition of features in common between the action of the weaver gene in the cerebellum and in the dopamine system. These studies will require biochemical measurements of and anatomical distribution of tyrosine hydroxylase, dopamine, and tyrosine hydroxylase messenger RNA in addition to the anatomical distribution of substance P, somatostatin, enkephalin. Synaptosomal uptake of 3H dopamine and retrograde tracer studies will be used to examine axonal growth and maintenance. 3H thymidine mapping and the use of chimeric mice and examination of glial cells will aid the developmental studies. We intend to identify the primary and secondary targets of the weaver gene in the midbrain and/or striatum through the use of mouse chimeras that are mixtures of genetically normal and genetically weaver cells. This work has the eventual goal of uncovering the orderly sequence of genetic information which governs the development of dopamine-containing neurons. The disease produced by the weaver gene bears so much resemblance to two diseases of the basal ganglia, Parkinson's disease and Huntington's disease, in terms of the topography of cell and/or axonal loss in the basal ganglia, that we are encouraged to search for common principals underlying these disease states.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS020181-05
Application #
3400404
Study Section
Neurology A Study Section (NEUA)
Project Start
1983-12-01
Project End
1989-11-30
Budget Start
1987-12-01
Budget End
1988-11-30
Support Year
5
Fiscal Year
1988
Total Cost
Indirect Cost
Name
Tufts University
Department
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02111
Schein, J C; Wang, J K T; Roffler-Tarlov, S K (2005) The effect of GIRK2(wv) on neurite growth, protein expression, and viability in the CNS-derived neuronal cell line, CATH.A-differentiated. Neuroscience 134:21-32
Peng, Jun; Wu, Zhijin; Wu, Yongqin et al. (2002) Inhibition of caspases protects cerebellar granule cells of the weaver mouse from apoptosis and improves behavioral phenotype. J Biol Chem 277:44285-91
Schimmel, J J; Crews, L; Roffler-Tarlov, S et al. (1999) 4.5 kb of the rat tyrosine hydroxylase 5' flanking sequence directs tissue specific expression during development and contains consensus sites for multiple transcription factors. Brain Res Mol Brain Res 74:1-14
Schein, J C; Hunter, D D; Roffler-Tarlov, S (1998) Girk2 expression in the ventral midbrain, cerebellum, and olfactory bulb and its relationship to the murine mutation weaver. Dev Biol 204:432-50
Harrison, S M; Roffler-Tarlov, S K (1998) Cell death during development of testis and cerebellum in the mutant mouse weaver. Dev Biol 195:174-86
Roffler-Tarlov, S; Brown, J J; Tarlov, E et al. (1996) Programmed cell death in the absence of c-Fos and c-Jun. Development 122:1-9
Oo, T F; Blazeski, R; Harrison, S M et al. (1996) Neuron death in the substantia nigra of weaver mouse occurs late in development and is not apoptotic. J Neurosci 16:6134-45
Roffler-Tarlov, S; Martin, B; Graybiel, A M et al. (1996) Cell death in the midbrain of the murine mutation weaver. J Neurosci 16:1819-26
Banerjee, S A; Roffler-Tarlov, S; Szabo, M et al. (1994) DNA regulatory sequences of the rat tyrosine hydroxylase gene direct correct catecholaminergic cell-type specificity of a human growth hormone reporter in the CNS of transgenic mice causing a dwarf phenotype. Brain Res Mol Brain Res 24:89-106
Grosson, C L; MacDonald, M E; Duyao, M P et al. (1994) Synteny conservation of the Huntington's disease gene and surrounding loci on mouse Chromosome 5. Mamm Genome 5:424-8

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