Ontogeny of DNA synthetic rhythms in chick (Gallus domesticus) liver.
1. The diurnal pattern of DNA synthesis and mitotic activity in neonatal (1-4-day-old) chick liver were investigated under various feeding and lighting regimens. 2. In the meal-fed chicks under the condition of light-dark cycle, DNA synthesis exhibited a 12 hr cycle; the peaks occurring at 9:00 and 21:00. 3. Fasting caused a gradual decrease in the 21:00 peaks. 4. The changes in the lighting regimen to 24 hr continuous lighting also caused a profound change in the DNA-synthetic pattern, suggesting a complex interplay of feeding and lighting regimens in the manifestation of the DNA-synthetic rhythm in neonatal chick liver.
Oka
T
T
Department of Nutrition, School of Medicine, University of Tokushima, Japan.
Han
J P
JP
Fujii
T
T
Miyamoto
K
K
Suzuki
I
I
Natori
Y
Y
D000818:Animals; D002645:Chickens / Q000378:metabolism*; D002940:Circadian Rhythm; D004247:DNA / Q000096:biosynthesis*; D004435:Eating; D005215:Fasting; D008027:Light; D008099:Liver / Q000378:metabolism*; D008297:Male; D008940:Mitotic Index
D004247:DNA