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Intertidal dwellers exhibit a circatidal rhythm corresponding to the tidal cycles, but its molecular mechanism remains largely unknown. The mangrove cricket  Apteronemobius asahinai  simultaneously exhibits circatidal and circadian rhythms in its locomotor activity. In  A. asahinai , it is considered that the circatidal rhythm is generated by the circatidal clock, and its molecular mechanism appears to differ from that of the circadian clock. For the molecular dissection, it is necessary to investigate the effects of a candidate gene disruption in several circatidal rhythms. However, the circatidal rhythms other than locomotor activity have not been examined in this species. Here, to identify biological processes related to the circatidal rhythm, we performed whole-transcriptome analysis using RNA sequencing with RNA samples extracted from whole crickets. Under a light-dark cycle without tidal stimuli, more contigs showed a diel expression pattern than a tidal expression pattern. Gene ontology (GO) enrichment analysis revealed that most GO terms overrepresented in contigs related to the tidal cycle were also overrepresented in contigs related to the diel cycle. GO terms specific to tide-related contigs were related to cuticle development, melanization, and sclerotization. These results suggest that physiological events in the cuticle may be controlled by the circatidal clock.

Possible biological processes controlled by the circatidal clock in the mangrove cricket inferred from transcriptome analysis