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XOL-1 regulates developmental timing by modulating the H3K9 landscape in C. elegans early embryos
Eshna Jash1, Anati Alyaa Azhar1, Hector Mendoza1
1Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, Michigan, United States of America.
Plos Genetics
|August 15, 2024
Summary
The master regulator XOL-1 is crucial for C. elegans male development, but new research shows it also regulates hermaphrodite embryogenesis timing. Loss of XOL-1 accelerates cell division and alters gene expression, involving MET-2 in hermaphrodites.
Area of Science:
- Developmental Biology
- Genetics
- Nematode Biology
Background:
- Sex determination in C. elegans is regulated by XOL-1 based on X:autosome ratios.
- XOL-1 is essential for male development but its role in hermaphrodites was considered minor.
Purpose of the Study:
- To investigate the role of XOL-1 in hermaphrodite C. elegans embryogenesis.
- To elucidate the downstream effectors and mechanisms of XOL-1 in hermaphrodite development.
Main Methods:
- Utilized imaging and bioinformatics techniques.
- Analyzed xol-1 mutant embryos for cell division rates and transcriptional programs.
- Investigated the role of MET-2 (H3K9 methyltransferase) in xol-1 mutant phenotypes.
Main Results:
- Loss of xol-1 in hermaphrodites accelerates cell division and advances the transcriptional program.
- XOL-1 regulates the timing of dosage compensation and sex-biased gene expression in hermaphrodites.
- xol-1 mutants exhibit MET-2 overexpression and altered H3K9me landscape; loss of met-2 partially rescues xol-1 mutant phenotypes.
Conclusions:
- XOL-1 is a significant developmental regulator in both male and hermaphrodite C. elegans embryos.
- MET-2 acts as a downstream effector of XOL-1 in hermaphrodite development, influencing epigenetic modifications.
