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DNMT1 mutant ants develop normally but have disrupted oogenesis.
Iryna Ivasyk1, Leonora Olivos-Cisneros2, Stephany Valdés-Rodríguez2,3
1Laboratory of Social Evolution and Behavior, The Rockefeller University, New York, NY, USA. iivasyk@rockefeller.edu.
Nature Communications
|April 18, 2023
Summary
Ants can develop normally without DNA methylation or the DNMT1 enzyme, challenging previous theories. However, DNA methyltransferase 1 (DNMT1) is essential for germline development and reproduction in these insects.
Area of Science:
- Epigenetics
- Insect Biology
- Developmental Biology
Background:
- DNA methylation is a key gene regulator in mammals, but its role in arthropods, particularly in social insects, is debated.
- Previous studies suggested DNA methylation regulates caste development in eusocial insects, but findings lack consistency.
Purpose of the Study:
- To investigate the function of DNA methylation and the DNMT1 enzyme in the development and reproduction of the clonal raider ant, Ooceraea biroi.
- To clarify the role of DNA methylation in caste determination and germline function in ants.
Main Methods:
- CRISPR/Cas9 gene editing was used to mutate the DNA methyltransferase DNMT1 in Ooceraea biroi.
- DNA methylation levels were assessed in mutant and wild-type ants.
- Developmental and reproductive phenotypes of mutant ants were observed and compared to wild-type.
Main Results:
- Mutant ants exhibited significantly reduced DNA methylation but showed no defects in development.
- No evidence was found supporting DNA methylation's role in regulating caste development.
- Mutant ants were sterile, indicating a critical role for DNMT1 in germline function.
- DNMT1 was observed in the ovaries and oocytes of wild-type ants, suggesting maternal provisioning.
Conclusions:
- Ooceraea biroi can develop normally without DNA methylation or functional DNMT1, contrasting with mammals.
- DNA methylation does not appear to regulate caste development in this ant species.
- DNMT1 plays an essential, albeit previously unknown, role in the insect germline, particularly in reproduction.
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