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Ecdysis triggering hormone modulates molt behaviour in the redclaw crayfish Cherax quadricarinatus, providing a mechanistic evidence for conserved function in molt regulation across Pancrustacea.

Abstract：

:Molting enables growth and development across ecdysozoa. The molting process is strictly controlled by hormones - ecdysteroids. Ecdysteroidogenesis occurs in theprothoracic glands and stimulated by prothoracicotropic hormone in insects, while it ensues in the Y-organ and regulated by the molt inhibiting hormone in crustaceans. A peak in ecdysteroids in the hemolymph induces a cascade of multiple neuropeptides including Ecdysis Triggering Hormone (ETH) and Corazonin. The role of ETH is well defined in controlling the molt process in insects, but it is yet to be defined in crustaceans. In this study, we investigated the behavioral response of intermolt crayfish to ETH and Corazonin injections as well as the impact of ETH on the molt period using in vivo assays. Injection of Corazonin and ETH resulted in a clear and immediate eye twitching response to these two neuropeptides. The Corazonin injection induced eye twitching in slow and asynchronous manner, while ETH injection caused eye twitching in a relatively fast and synchronous way. A single injection of ETH to crayfish resulted in a remarkable prolong molt period, at twice the normal molting cycle, suggesting that ETH plays a key role in controlling the molt cycle in decapod crustaceans. Given the key significance of ETH in molt regulation and its plausible application in pest control, we characterized ETH across the pancrustacean orders. Bioinformatic analysis shows the mature ETH sequence is identical in all studied decapod species. ETH can be classified into specific groups based on the associated motif in each insect order and shows an insect motif -KxxPRx to be conserved in crustaceans.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

Minh Nhut T,Mykles DL,Elizur A,Ventura T

doi

10.1016/j.ygcen.2020.113556

subject

Has Abstract

pub_date

2020-11-01 00:00:00

pages

113556

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(20)30309-9

journal_volume

298

pub_type

杂志文章

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