The expression of the clock gene cycle has rhythmic pattern and is affected by photoperiod in the moth Sesamia nonagrioides

The Cryptochrome1 (cry1) Gene has Oscillating Expression Under Short and Long Photoperiods inSesamia nonagrioides

“…In Drosophila, PER is the key negative regulator of clock function, but until now, in all insects where cry2 is present and irrespective of cry1's presence, CRY2 shows this role [29]. In a previous work we found that the chronological pattern of gene expression in MCSB brain is amazingly distinct from that of Drosophila [12]. In the MCSB, Sncyc and Snper mRNA levels oscillate with a similar phase, but in Drosophila they are in antiphase [30,31].…”

“…Second, in insects enclosing only CRY2, the cryptochrome may service dual functions, as both a transcriptional repressor and a photoreceptor [25]. In a previous work we found that the cycle gene in MCSB show interesting changes related to Drosophila, proposing that this species is a remarkable new model to study the molecular control of insect biological clocks [12]. We speculate that in insects maybe there is another possibility, such as in MCSB, where it seems that CRY1 alone, could evolve dual functions as transcriptional repressor and a photoreceptor.…”

“…In order to comprehend whether and how the circadian system is associated to photoperiodism, a significant piece of evidence is whether clock genes products oscillate and how they respond to a varying photoperiod [7][8][9]. The connection of circadian clock genes in diapause initiation has been debated [1,[10][11][12].…”

“…When diapause has been induced, larvae persist to grow and molt without pupating and up to six additional instars, elsewhere the normal five or six have been noticed, when larvae are continuous in diapausing conditions [11]. To accomplish indications to the link among the molecular mechanism of circadian and photoperiod clocks, in recent works we studied the expression of the clock genes period, timeless and cycle and the results suggested that transcriptional regulations of these clock genes act in the diapause programming in MCSB [11,12]. In the current study, we examined the contribution of cryptochrome1 (cry1) gene in the circadian rhythm and in the photoperiodic regulation of diapause in S. nonagrioides.…”

Comparative analysis of the daytime and nighttime brain transcriptomes of Pelteobagrus vachellii

“…Jiang, Wang, Cao, Dong, and Chen (2017) suggested that the circadian clock in non‐SCN regions of chick brains, such as the hypothalamus, may be involved in regulating photoperiod information. Furthermore, Kontogiannatos, Gkouvitsas, and Kourti (2017) demonstrated that photoperiodic situation influences the expression process and/or amounts of circadian clock gene cycles in Sesamia nonagrioides .…”