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clock neurons
by James (no login)News tips from the Journal of Neuroscience
1. PDF Differentially Affects Groups of Clock Neurons
Taishi Yoshii, Corinna Wülbeck, Hana Sehadova, Shobi Veleri, Dominik Bichler, Ralf Stanewsky, and Charlotte Helfrich-Förster
The ~150 clock neurons in Drosophila brain are classified into seven groups based on position, size, protein expression, and function. Some of these groups primarily drive morning activity, whereas others drive evening activity. Interactions among these groups are required to maintain rhythmic activity patterns and molecular oscillations, but these interactions are poorly understood. The neuropeptide pigment-dispersing factor (PDF), which is expressed in the cells that drive morning peak activity, has been proposed to couple the oscillations of different clock neurons. PDF lengthens the period of some neurons, and shortens the period of others. Yoshii et al. have now identified the specific functional groups accelerated and decelerated by PDF. These differential effects of PDF may help adjust circadian activity patterns to seasonal changes in day length. As days lengthen, the morning activity peak in normal flies is accelerated, and the evening peak is delayed. This effect was abolished in PDF-null flies.
Posted on Feb 24, 2009, 6:06 PM
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