The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Rhythmic transcription: the molecular basis of circadian melatonin synthesis.

Adaptation to a changing environment is an essential feature of physiological regulation. The day/night rhythm is translated into hormonal oscillations governing the physiology of all living organisms. In mammals the pineal gland is responsible for the synthesis of the hormone melatonin in response to signals originating from the endogenous clock located in the hypothalamic suprachiasmatic nucleus (SCN). The molecular mechanisms involved in rhythmic synthesis of melatonin involve the CREM gene, which encodes transcription factors responsive to activation of the cAMP signalling pathway. The CREM product, ICER, is rhythmically expressed and participates in a transcriptional autoregulatory loop which also controls the amplitude of oscillations of serotonin N-acetyl transferase (AANAT), the rate-limiting enzyme of melatonin synthesis. In contrast, chick pinealocytes possess an endogenous circadian pacemaker which directs AANAT rhythmic expression. cAMP-responsive activator transcription factors CREB and ATF1 and the repressor ICER are highly conserved in the chick with the notable exception of ATF1 that possesses two glutamine-rich domains in contrast to the single domain encountered to date in mammalian systems. ICER is cAMP inducible and undergoes a characteristic day-night oscillation in expression reminiscent of AA-NAT, but with a peak towards the end of the night. Interestingly CREB appears to be phosphorylated constitutively with a transient fall occurring at the beginning of the night. Thus, a transcription factor modulates the oscillatory levels of a hormone.[1]


  1. Rhythmic transcription: the molecular basis of circadian melatonin synthesis. Foulkes, N.S., Whitmore, D., Sassone-Corsi, P. Biol. Cell (1997) [Pubmed]
WikiGenes - Universities