In particular, gonadotropin replacing hormone (GnRH) is released in rhythmic pulses, and disruption of this rhythm is associated with pathologies of reproduction and sexual development.
For example, while continuous light normally causes arrhythmicity in wild-type flies, the knockdown of Kr-h1, Nipped-A, Thor, nrv1, Nf1, CG11155 (ionotropic glutamate receptor), and Fmr1 resulted in flies that were rhythmic, suggesting a disruption in the light input pathway to the clock.
His longtime friend and adversary Pieter van den Toorn argued that Stravinsky's signature rhythmic and metric disruptions and displacements respond better to precision than to sloppiness.
All these mutants demonstrate disruption of rhythmic pattern of locomotor activity and at the gene expression level [ 12- 14].
The increased cancer incidence in lines that maintain circadian rhythms seems inconsistent with the conclusion that disruption of rhythmic sympathetic outflow underlies the increased tumor development.
In some nonmammalian vertebrates, the pineal gland is considered to serve as the master clock organ because its removal results in disruption of rhythmic behaviours such as locomotor activity [ 18, 19].
It is also tempting to speculate that disruption of the rhythmic regulation of mTOR signaling can be responsible for the well-known jet leg-initiated dysfunction of the digestive system.
The extensive nature of this disruption to rhythmicity in the peripheral transcriptome is further emphasised upon considering that those strongly rhythmic transcripts not altered by forced desynchrony are perhaps not reflective of the peripheral transcriptome at large.
We also note that forced expression of per or cyc in ISCs is able to partially restore rhythmic divisions in their respective mutant backgrounds, whereas disruption of these genes in only ECs perturbs ISC rhythmic division.
Mice with a targeted disruption of different circadian proteins lose rhythmic patterns of behavior and develop multiple physiological abnormalities [ 3, 6].
