Oxidative Stress Experienced during Early Development Influences the Offspring Phenotype

Area of Science:

• Evolutionary biology
• Environmental toxicology
• Developmental biology

Background:

• Early-life oxidative stress (OS) can alter an individual's phenotype.
• The transgenerational effects of early-life OS are not well understood.
• Glutathione is a key antioxidant with potential roles in mediating these effects.

Purpose of the Study:

• To investigate the consequences of early-life OS on parental care and offspring phenotype in zebra finches.
• To examine the role of glutathione in mediating the effects of OS.
• To explore potential pre- and postnatal parental effects on the next generation.

Main Methods:

• Zebra finches were exposed to experimentally induced early-life OS by inhibiting glutathione synthesis.
• Offspring from OS-exposed and control parents were cross-fostered into enlarged or reduced broods.
• Erythrocyte glutathione levels, body mass, and tarsus length were measured in offspring.

Main Results:

• Brood size influenced erythrocyte glutathione levels, indicating environmental sensitivity.
• Parental early-life OS altered offspring sex-specific body mass responses to brood size.
• Offspring reared by OS-exposed foster parents exhibited reduced tarsus length, indicating impaired growth.

Conclusions:

• Environmental conditions during development affect glutathione levels and can influence the next generation.
• Early-life OS can constrain offspring phenotype and parental capacity.
• Transgenerational effects of OS may operate through both direct and indirect parental pathways.