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Protein/DNA interaction profiling reveals novel regulators of the pineal transcriptome
1School of Biosciences, Cardiff University, Cardiff CF10 3US, UK.
Molecular and Cellular Endocrinology
|May 2, 2006
Summary
Daily rhythms in the rat pineal gland involve complex gene regulation. Researchers identified novel DNA-binding activities, including AP-2, contributing to these crucial circadian neuroendocrine functions.
Area of Science:
- Circadian Biology
- Neuroendocrinology
- Molecular Biology
Background:
- The rat pineal gland exhibits daily variations in gene expression, linked to hormone production cycles.
- Understanding the transcriptional regulation behind these rhythms is key to circadian neuroendocrine function.
Purpose of the Study:
- To investigate day-night changes in DNA-binding activity associated with transcriptional rhythms in the rat pineal gland.
- To identify novel DNA-binding factors involved in the gland's circadian regulation.
Main Methods:
- Utilized a protein/DNA interaction array to screen for differential DNA-binding activities between day and night.
- Validated array findings using conventional DNA-binding assays.
- Detected and characterized specific AP-2 protein isoforms (AP-2alpha, AP-2beta, AP-2gamma) in the pineal gland.
Main Results:
- Out of 54 potential DNA-binding sequences, 47 were detected, with 29 (62%) showing significant day:night differences.
- Confirmed known rhythmic activities (CRE, AP-1) and identified novel activities, notably a nocturnally elevated AP-2 consensus binding activity.
- Demonstrated the presence of AP-2beta and AP-2gamma proteins, and a nocturnally elevated AP-2alpha isoform in the rat pineal gland.
Conclusions:
- The rat pineal gland possesses a complex network of transcriptional rhythms.
- Novel DNA-binding factors, including specific AP-2 isoforms, contribute significantly to the gland's circadian neuroendocrine function.
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