Influence of photoperiodic history on clock genes and the circadian pacemaker in the rat retina.
Eur J Neurosci
; 23(1): 105-11, 2006 Jan.
Article
em En
| MEDLINE
| ID: mdl-16420420
ABSTRACT
The influence of seasonal lighting conditions on expression of clock genes and the circadian pacemaker was investigated in the rat retina. For this purpose, the 24-h profiles of nine clock genes (bmal1, clock, per1, per2, per3, dec1, dec2, cry1 and cry 2) and the arylalkylamine N-acetyltransferase gene as an indicator of the circadian pacemaker output were compared between light-dark periods of 8 16 and 16 8 h. The photoperiod influenced the daily patterns of the amount of transcript for per1, per3, dec2 and arylalkylamine N-acetyltransferase. This indicates that photoperiodic information modulates clock gene expression in addition to the circadian pacemaker of the retina. Under constant darkness, photoperiod-dependent changes in the daily profile of the level of transcript persisted for the arylalkylamine N-acetyltransferase gene but not for any of the clock genes. Hence, quantitative expression of each clock gene is influenced by the photoperiod only under the acute light-dark cycle, whereas the pacemaker is capable of storing photoperiodic information from past cycles.
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Base de dados:
MEDLINE
Assunto principal:
Retina
/
Proteínas Nucleares
/
Expressão Gênica
/
Regulação da Expressão Gênica
/
Ritmo Circadiano
/
Fotoperíodo
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article