Abstract
The hypothalamic gonadotropin-releasing hormone (GnRH) neurons are important regulators of reproductive function. During development, these cells arise in the olfactory placode and migrate to the central nervous system, where they form a diffuse population of neurosecretory cells that mediate central nervous system control of reproduction. Little is known of the mechanisms regulating the differentiation of these cells. Studies of the transcriptional regulation of the GnRH gene have demonstrated the importance of the GATA family of zinc-finger transcription factors in gene expression. Although GATA factors are not highly expressed in mature GnRH-secreting neurons, we report that GATA-4 is highly expressed in migrating GnRH neurons in the developing mouse. We also report that a second DNA binding activity regulating GnRH gene expression at the site of GATA-factor action persists in mature hypothalamus and may also play a role in gene expression in the differentiated GnRH neuron.
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