Temporally replicated DNA methylation patterns in great tit using reduced representation bisulfite sequencing

Area of Science:

• Epigenetics
• Avian Biology
• Molecular Ecology

Background:

• Seasonal reproduction is a key fitness trait, but its molecular basis remains unclear.
• DNA methylation is a potential epigenetic mechanism influencing reproductive timing across species.
• Understanding these mechanisms in birds can provide insights into adaptation and evolution.

Purpose of the Study:

• To investigate genome-wide DNA methylation changes related to breeding timing in great tits (Parus major).
• To analyze temporal variations in DNA methylation under controlled temperature conditions.
• To establish a resource for future research on epigenetics and reproductive phenology.

Main Methods:

• Utilized reduced representation bisulfite sequencing (RRBS) to examine DNA methylation levels.
• Collected DNA from erythrocytes of great tits across four time points during the breeding season.
• Generated extensive sequencing data (63 libraries, ~20 million reads/library) for individual-level analysis.

Main Results:

• Generated comprehensive genome-wide DNA methylation data from great tits.
• Captured temporal variation in DNA methylation throughout the experimental breeding season.
• Data reflects responses to contrasting temperature treatments.

Conclusions:

• Provides a valuable dataset for studying the role of DNA methylation in avian reproductive timing.
• Highlights the potential of epigenetic modifications in mediating environmental influences on fitness traits.
• Lays groundwork for future research connecting epigenetics, environmental cues, and phenological adaptation.