Dorothy F. Sobieszczuk

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Cranial neural crest cells are a pluripotent population of cells derived from the neural tube that migrate into the branchial arches to generate the distinctive bone, connective tissue and peripheral nervous system components characteristic of the vertebrate head. The highly conserved segmental organisation of the vertebrate hindbrain plays an important(More)
Neuronal differentiation is regulated by proneural genes that promote neurogenesis and inhibitory mechanisms that maintain progenitors. This raises the question of how the up-regulation of proneural genes required to initiate neurogenesis occurs in the presence of such inhibition. We carried out loss and gain of gene function, an interaction screen for(More)
Within the developing vertebrate head, the migration of neural tube-derived neural crest cells (NCCs) through the cranial mesenchyme is patterned into three streams, with mesenchyme adjacent to rhombomeres (r)3 and r5 maintained NCC-free. The receptor tyrosine kinase erbB4 is expressed within r3 and r5 and is required to maintain the r3-adjacent NCC-free(More)
The F9 murine embryonal carcinoma (EC) cell line, a well established model system for the study of retinoic acid (RA)-induced differentiation, differentiates into cells resembling three types of extra-embryonic endoderm (primitive, parietal and visceral), depending on the culture conditions and RA concentration used. A number of previously identified genes(More)
Much progress has been made in understanding the developmental roles of Eph receptor tyrosine kinases and their membrane-bound ligands, ephrins. Interactions between these molecules fall largely into two classes: EphA receptors (of which there are eight family members) bind promiscuously to glycosylphosphatidylinositol (GPI)anchored ephrin-A ligands (five(More)
Maximal histamine release (HR) from leucocytes, in response to Concanavalin A (Con A) was significantly higher in a group of 16 adults with moderate to severe atopic dermatitis (AD) when compared to 13 non-atopic adults. In a further 4 adults with AD, HR was similar to that in the normals, suggesting the existence of 'high releaser' and 'low releaser'(More)
Previous studies have demonstrated that depletion of Gas7 impedes neurite outgrowth in primary cultures of Purkinje neurons, and that Gas7 promotes neurite outgrowth in PC12 cells. To investigate the physiological function of Gas7, we generated by homologous recombination a Gas7-mutant mouse which produced a Gas7 variant protein with an in-frame deletion of(More)
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