Journal
FRONTIERS IN PHYSIOLOGY
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2022.863380
Keywords
clock gene; diapause; Bombyx mori; transcription activator-like effector nuclease (TALEN); circadian clock
Categories
Funding
- Ministry of Education, Science, Sports and Culture of Japan
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This study investigates the roles of circadian clock genes in temperature-dependent diapause induction in the domestic silkworm. The results show that these genes regulate temperature-induced diapause by acting upstream of cerebral GABAergic and diapause hormone signaling pathways. Furthermore, the temporal expression of clock genes differs significantly between wild-type silkworms and TRPA1 knockout mutants during embryonic development. These findings provide target genes for regulating temperature-dependent diapause induction in silkworms.
The bivoltine strain of the domestic silkworm, Bombyx mori, exhibits a facultative diapause phenotype that is determined by maternal environmental conditions during embryonic and larval development. Although a recent study implicated a circadian clock gene period (per) in circadian rhythms and photoperiod-induced diapause, the roles of other core feedback loop genes, including timeless (tim), Clock (Clk), cycle (cyc), and cryptochrome2 (cry2), have to be clarified yet. Therefore, the aim of this study was to elucidate the roles of circadian clock genes in temperature-dependent diapause induction. To achieve this, per, tim, Clk, cyc, and cry2 knockout (KO) mutants were generated, and the percentages of diapause and non-diapause eggs were determined. The results show that per, tim, Clk, cyc, and cry2 regulated temperature-induced diapause by acting upstream of cerebral gamma-aminobutyric acid (GABA)ergic and diapause hormone signaling pathways. Moreover, the temporal expression of the clock genes in wild-type (wt) silkworms was significantly different from that of thermosensitive transient receptor potential ankyrin 1 (TRPA1) KO mutants during embryonic development. Overall, the findings of this study provide target genes for regulating temperature-dependent diapause induction in silkworms.
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