HIF signaling in the prothoracic gland regulates growth and development in hypoxia but not normoxia in Drosophila.

The developmental regulation of body size is a fundamental life-history characteristic that in most animals is tied to the transition from juvenile to adult form. In holometabolous insects, this transition is ostensibly initiated at the attainment of a critical weight in the final larval instar. It has been hypothesized that the size-sensing mechanism used to determine attainment of critical weight exploits oxygen limitation as a larvae grows beyond the oxygen-delivery capacity of its fixed tracheal system; that is, developmentally induced cellular hypoxia initiates the synthesis of the molting hormone ecdysone by the prothoracic gland.

Genome-Wide Association Analysis of Anoxia Tolerance in .

As the genetic bases to variation in anoxia tolerance are poorly understood, we used the Genetics Reference Panel (DGRP) to conduct a genome-wide association study (GWAS) of anoxia tolerance in adult and larval Survival ranged from 0-100% in adults exposed to 6 h of anoxia and from 20-98% for larvae exposed to 1 h of anoxia. Anoxia tolerance had a broad-sense heritability of 0.552 in adults and 0.