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Department of Biology, Gilmer Hall, University of Virginia, P.O. Box 400328, Charlottesville, VA 22904-4328, USA
*Author for correspondence (e-mail: crc2s{at}virginia.edu)
Accepted September 5, 2001
As the only class I helix-loop-helix transcription factor in Drosophila, Daughterless (Da) has generally been regarded as a ubiquitously expressed binding partner for other developmentally regulated bHLH transcription factors. From analysis of a novel tissue-specific allele, dalyh, we show that da expression is not constitutive, but is dynamically regulated. This transcriptional regulation includes somatic ovary-specific activation, autoregulation and negative regulation. Unexpectedly, the diverse functions of da may require that expression levels be tightly controlled in a cell and/or tissue-specific manner. Our analysis of dalyh identifies it as the first springer insertion that functions as an insulating element, with its disruptive activity mediated by the product of a fourth chromosome gene, Suppressor of lyh [Su(lyh)].
Key words: bHLH, Autoregulation, Oogenesis, Insulation, daughterless, Drosophila
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