The proposed research will investigate factors that may be important in determining the lineages of two precociously developing neurons in the frog embryo, Rohon-Beard (RB) neurons and primary motoneurons (PMN). Quantitative fate maps for these neurons, derived from intracellular injections of the lineage marker, horseradish peroxidase, have recently will constructed for the 16- and 32-cell stage blastulae. The proposed experiments will perturb the normal blastomere arrangement in a variety of ways in order to determine, by comparison to the normal quantitative fate map, whether the phenotype and number of these two specific neurons are determined to arise from particular blastomers, or to arise from any blastomere located in the appropriate position. Furthermore, the non-CNS descendants of these blastomeres will be mapped, and compared to normal maps. These experiments are important for the study of the effect of genomic, cytoplasmic, or cell-to-cell communication influences on the commitment of embryonic cells to the nervous system. Specifically, the neuronal and non-neuronal lineages of various identifiable blastomeres will be mapped after manipulations that affect gap junctional communication determination or commitment to lineage are transferred between cells during the early cleavage stages. Cytoplasmic transplantation and inhibition of metabolic by the 32-cell stage of development, in order to locate the subcellular moiety or process controlling this lineage determination. Finally, single cell transplantations and embryo- half separations will be performed to investigate the role of direct cell contact on those blastomeres that seem to be induced by their neighbors to contribute to CNS lineages. The results of these experiments will identify the cellular interactions that are necessary at cleavage stages for the expression of neuronal lineages, and will allow us to analyze what developmental decisions lead to the formation of the vertebrate nervous system.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS023158-06
Application #
3406367
Study Section
Neurology B Subcommittee 2 (NEUB)
Project Start
1986-01-15
Project End
1991-12-31
Budget Start
1991-01-01
Budget End
1991-12-31
Support Year
6
Fiscal Year
1991
Total Cost
Indirect Cost
Name
University of Virginia
Department
Type
Schools of Medicine
DUNS #
001910777
City
Charlottesville
State
VA
Country
United States
Zip Code
22904
Yan, Bo; Neilson, Karen M; Ranganathan, Ramya et al. (2015) Microarray identification of novel genes downstream of Six1, a critical factor in cranial placode, somite, and kidney development. Dev Dyn 244:181-210
Grant, Paaqua A; Yan, Bo; Johnson, Michael A et al. (2014) Novel animal pole-enriched maternal mRNAs are preferentially expressed in neural ectoderm. Dev Dyn 243:478-96
Lee, Hyun-Kyung; Lee, Hyun-Shik; Moody, Sally A (2014) Neural transcription factors: from embryos to neural stem cells. Mol Cells 37:705-12
Karpinski, Beverly A; Maynard, Thomas M; Fralish, Matthew S et al. (2014) Dysphagia and disrupted cranial nerve development in a mouse model of DiGeorge (22q11) deletion syndrome. Dis Model Mech 7:245-57
Moody, Sally A; Klein, Steven L; Karpinski, Beverley A et al. (2013) On becoming neural: what the embryo can tell us about differentiating neural stem cells. Am J Stem Cells 2:74-94
Yan, Bo; Neilson, Karen M; Moody, Sally A (2010) Microarray identification of novel downstream targets of FoxD4L1/D5, a critical component of the neural ectodermal transcriptional network. Dev Dyn 239:3467-80
Rogers, Crystal D; Moody, Sally A; Casey, Elena S (2009) Neural induction and factors that stabilize a neural fate. Birth Defects Res C Embryo Today 87:249-62
Yan, Bo; Neilson, Karen M; Moody, Sally A (2009) foxD5 plays a critical upstream role in regulating neural ectodermal fate and the onset of neural differentiation. Dev Biol 329:80-95
Yan, Bo; Neilson, Karen M; Moody, Sally A (2009) Notch signaling downstream of foxD5 promotes neural ectodermal transcription factors that inhibit neural differentiation. Dev Dyn 238:1358-65
Schlosser, Gerhard; Awtry, Tammy; Brugmann, Samantha A et al. (2008) Eya1 and Six1 promote neurogenesis in the cranial placodes in a SoxB1-dependent fashion. Dev Biol 320:199-214

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