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PLANT PHYSIOLOGY , Vol 102, Issue 4 1299-1305, Copyright © 1993 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
The Interplay of Light and the Circadian Clock (Independent Dual Regulation of Clock-Controlled Gene ccg-2(eas)
G. Arpaia, J. J. Loros, J. C. Dunlap, G. Morelli and G. Macino
Dipartimento di Biopatologia Umana, Sezione di Biologia Cellulare Policlinico Umberto I, Universita' di Roma La Sapienza, 00161 Roma, Italy (G.A., G. Macino)
Ambient light is the major agent mediating entrainment of circadian rhythms
and is also a major factor influencing development and morphogenesis. We
show that in Neurospora crassa the expression of clock-controlled gene 2
(ccg-2), a gene under the control of the circadian clock and allelic to the
developmental gene easy wettable (eas), is regulated by light in wild-type
strains. Light elicits a direct and important physiological effect on
ccg-2(eas) expression as demonstrated using several mutant Neurospora
strains. In white collar mutants (wc-1 and wc-2) that are "blind" to blue
light, ccg-2(eas) mRNA shows no variation following illumination with
saturating light. By contrast, ccg-2(eas) mRNA is photoinduced in
clock-null strains such as frequency9 (bd;frq9). The results in the clock
mutants show that an intact circadian oscillator is not required for light
induction of ccg-2(eas). Thus, ccg-2(eas) is subject to a dual regulation
that involves separable regulation by light and circadian rhythm.
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