Upregulation of E93 Gene Expression Acts as the Trigger for Metamorphosis Independently of the Threshold Size in the Beetle Tribolium castaneum

被引：51

作者：

Chafino, Silvia ^{[1
]}

Urena, Enric ^{[1
]}

Casanova, Jordi ^{[2
,3
]}

Casacuberta, Elena ^{[1
]}

Franch-Marro, Xavier ^{[1
]}

Martin, David ^{[1
]}

机构：

[1] Univ Pompeu Fabra, CSIC, Inst Evolutionary Biol, Passeig Maritim Barceloneta 37-49, Barcelona 08003, Spain

[2] CSIC, Inst Biol Mol Barcelona, Baldiri Reixac 4, E-08028 Barcelona, Spain

[3] BIST, IRB Barcelona, Baldiri Reixac 10, Barcelona 08028, Spain

来源：

CELL REPORTS | 2019年 / 27卷 / 04期

关键词：

RED FLOUR BEETLE; JUVENILE-HORMONE; BROAD-COMPLEX; TOBACCO HORNWORM; PRECOCIOUS METAMORPHOSIS; INSECT METAMORPHOSIS; IMAGINAL DISC; DROSOPHILA; GROWTH; DOWNSTREAM;

D O I：

10.1016/j.celrep.2019.03.094

中图分类号：

Q2 [细胞生物学];

学科分类号：

071009 ; 090102 ;

摘要：

Body size in holometabolous insects is determined by the size at which the juvenile larva undergoes metamorphosis to the pupal stage. To undergo larva-pupa transition, larva must reach a critical developmental checkpoint, the threshold size (TS); however, the molecular mechanisms through which the TS cues this transition remain to be fully characterized. Here, we use the flour beetle Tribolium castaneum to characterize the molecular mechanisms underlying entry into metamorphosis. We found that T. castaneum reaches a TS at the beginning of the last larval instar, which is associated with the downregulation of TcKr-h1 and the upregulation of TcE93 and TcBr-C. Unexpectedly, we found that while there is an association between TS and TcE93 upregulation, it is the latter that constitutes the molecular trigger for metamorphosis initiation. In light of our results, we evaluate the interactions that control the larva-pupa transition and suggest alternative models.

引用

页码：1039 / +

页数：13

共 49 条

[1] THE DROSOPHILA E93 GENE FROM THE 93F EARLY PUFF DISPLAYS STAGE-SPECIFIC AND TISSUE-SPECIFIC REGULATION BY 20-HYDROXYECDYSONE [J].