Temperature modulates epidermal cell size in Drosophila melanogaster

Area of Science:

• Developmental Biology
• Ectotherm Physiology
• Evolutionary Biology

Background:

• Ectotherms typically exhibit larger body sizes at maturity when exposed to colder temperatures.
• Temperature's influence on body size is hypothesized to involve effects on epidermal cell growth, proliferation, or death.

Purpose of the Study:

• To investigate the impact of rearing temperature on epidermal cell size and number in Drosophila melanogaster.
• To examine these effects across different tissues (wing, leg, eye) and two distinct populations.

Main Methods:

• Drosophila melanogaster from two South American populations were reared at different temperatures.
• Epidermal cell size and number were quantified in the wing blade, basitarsus of the leg, and cornea of the eye.

Main Results:

• A decrease in rearing temperature led to an increase in the size of wings, legs, and eyes in both sexes and strains.
• This size increase was attributed to an increase in epidermal cell size, with no significant alteration in cell number.
• The effect of temperature on cell size was consistent across the studied tissues and populations.

Conclusions:

• Rearing temperature consistently influences epidermal cell size in Drosophila melanogaster, a finding potentially applicable to other cell types.
• While cell size is consistently affected by temperature, the evolutionary impacts on different organs are not uniform.
• Findings contribute to understanding growth control mechanisms in Drosophila under varying thermal conditions.