PMID: 12770000May 29, 2003Paper

Sequential deposition of yolk components during oogenesis in an insect, Aedes aegypti (Diptera: Culicidae)

Journal of Insect Physiology
H BriegelA O Lea

Abstract

Vitellogenesis in Aedes aegypti of uniform body size was followed at 27 degrees C in narrow time intervals throughout their first reproductive cycle by measuring the length, diameter, and volume of follicles and oocytes, the latter as an expression of the yolk mass (vitellus). Independent of all experimental conditions, a two-step process of elongation was recognized for both follicle length and yolk length, so that growth curves were consistently composed of two linear regressions with different slopes against time. Follicle lengths started to increase immediately after the blood meal, while oocytes took up to 6 h to show a measurable increase in yolk length. The first linear phase continued until 30 h, when yolk length reached 268+/-22 micro m. At this point, a transition occurred where the linearity shifted sharply for the next 6 h to 2-4-times higher slopes for both regressions. This second growth phase represented a 40% elongation of oocytes and follicles. Then, both curves leveled off at their final size, characteristic of mature ovaries: 462+/-10 micro m for oocytes, 489+/-11 micro m for follicles. These values remained constant until oviposition. The first linear growth phase was associated with an equicaloric and synch...Continue Reading

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Citations

Apr 5, 2005·Insect Biochemistry and Molecular Biology·Douglas H SieglaffMark R Brown
Feb 27, 2010·BMC Developmental Biology·Wagner VitalCarlos Logullo
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Sep 28, 2021·Frontiers in Microbiology·Arley Calle-TobónBerlin Londoño-Rentería

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