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Development, Vol 127, Issue 17 3777-3788, Copyright © 2000 by Company of Biologists
JOURNAL ARTICLES |
L Ma, J Merenmies and LF Parada
Center for Developmental Biology, UT Southwestern Medical Center, Dallas, TX 75390-9133, USA.
Neural development relies on stringent regulation of key genes that mediate specialized function. TrkA is primarily expressed in neural crest-derived sensory and sympathetic neurons where it transmits critical survival information. We have identified a 457 base pair sequence upstream of the murine first TrkA coding exon that is conserved in human and in chick, and is sufficient for expression in the correct cells with appropriate timing. Mutation analysis of consensus transcription factor binding domains within the minimal enhancer reveals a complex positive regulation that includes sites required for global expression and sites that are specifically required for DRG, trigeminal or sympathetic expression. These results provide a foundation for identification of the transcriptional machinery that specifies neurotrophin receptor expression.
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