Age- and temperature-dependent somatic mutation accumulation in Drosophila melanogaster

Area of Science:

• Genetics and Genomics
• Aging Research
• Comparative Biology

Background:

• Somatic mutations accumulate with age in a tissue-specific manner, as previously shown in mice.
• Understanding mutation accumulation across species provides insights into aging mechanisms.

Purpose of the Study:

• To investigate somatic mutation accumulation in Drosophila melanogaster using a reporter-based assay.
• To compare mutation frequencies and types between flies and mice.
• To explore the relationship between temperature, aging, and mutation rates in flies.

Main Methods:

• Utilized a transgenic Drosophila melanogaster model with a mutation reporter gene (lacZ locus).
• Quantified somatic mutation frequency and characterized genome rearrangements in fly tissues.
• Assessed the impact of age and temperature on mutation accumulation.

Main Results:

• Somatic mutation frequency in flies was approximately three times higher than in mice.
• Flies exhibited a greater proportion of large genome rearrangements compared to mice.
• Mutation accumulation in flies increased with age and was accelerated at higher temperatures, correlating with reduced lifespan.
• Higher mutation loads were observed in the thorax compared to the abdomen, implicating oxidative stress in flight muscles.

Conclusions:

• Somatic mutation loads are significantly higher in short-lived flies than in longer-lived mice.
• Mutation accumulation in flies is more closely linked to biological aging processes than chronological age.
• Environmental factors like temperature can exacerbate mutation rates and impact lifespan.