Titers of ecdysone, 20-hydroxyecdysone and juvenile hormone III throughout the life cycle of a hemimetabolous insect, the ovoviviparous cockroachNauphoeta cinerea

1985 ◽  
Vol 41 (7) ◽  
pp. 913-917 ◽  
Author(s):  
B. Lanzrein ◽  
V. Gentinetta ◽  
H. Abegglen ◽  
F. C. Baker ◽  
C. A. Miller ◽  
...  
Keyword(s):  
Life Cycle ◽  
Juvenile Hormone ◽  
Juvenile Hormone Iii ◽  
Hemimetabolous Insect

Epoxidation of juvenile hormone was a key innovation improving insect reproductive fitness

2021 ◽  
Vol 118 (45) ◽  
pp. e2109381118
Author(s):  
Marcela Nouzova ◽  
Marten J. Edwards ◽  
Veronika Michalkova ◽  
Cesar E. Ramirez ◽  
Marnie Ruiz ◽  
...  
Keyword(s):  
Life Cycle ◽  
Juvenile Hormone ◽  
Reproductive Performance ◽  
Reproductive Fitness ◽  
Fitness Cost ◽  
Evolutionary Significance ◽  
Methyl Farnesoate ◽  
Entire Life ◽  
Entire Life Cycle ◽  
Key Innovation

Methyl farnesoate (MF) plays hormonal regulatory roles in crustaceans. An epoxidated form of MF, known as juvenile hormone (JH), controls metamorphosis and stimulates reproduction in insects. To address the evolutionary significance of MF epoxidation, we generated mosquitoes completely lacking either of the two enzymes that catalyze the last steps of MF/JH biosynthesis and epoxidation, respectively: the JH acid methyltransferase (JHAMT) and the P450 epoxidase CYP15 (EPOX). jhamt−/− larvae lacking both MF and JH died at the onset of metamorphosis. Strikingly, epox−/− mutants, which synthesized MF but no JH, completed the entire life cycle. While epox−/− adults were fertile, the reproductive performance of both sexes was dramatically reduced. Our results suggest that although MF can substitute for the absence of JH in mosquitoes, it is with a significant fitness cost. We propose that MF can fulfill most roles of JH, but its epoxidation to JH was a key innovation providing insects with a reproductive advantage.

De novo biosynthesis of juvenile hormone III and I by the accessory glands of the male mosquito

1994 ◽  
Vol 24 (5) ◽  
pp. 437-444 ◽  
Author(s):  
Dov Borovsky ◽  
D.A. Carlson ◽  
R.G. Hancock ◽  
H. Rembold ◽  
E. Van Handel
Keyword(s):  
Juvenile Hormone ◽  
De Novo ◽  
Juvenile Hormone Iii ◽  
De Novo Biosynthesis ◽  
Accessory Glands ◽  
Male Mosquito

Biosynthesis of (10R)-Juvenile hormone III from farnesoic acid byAedes aegyptiovary

1994 ◽  
Vol 27 (1) ◽  
pp. 11-25 ◽  
Author(s):  
Dov Borovsky ◽  
David A. Carlson ◽  
István Ujváry ◽  
Glenn D. Prestwich
Keyword(s):  
Juvenile Hormone ◽  
Juvenile Hormone Iii ◽  
Farnesoic Acid
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