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Lineage-specific control of convergent differentiation by a Forkhead repressor
Karolina Mizeracka1,2, Julia M Rogers3,4, Jonathan D Rumley5
1Department of Genetics, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA.
Development (Cambridge, England)
|August 23, 2021
Summary
The Forkhead transcription factor UNC-130 is crucial for glial cell specification in C. elegans, acting as a repressor in one of three lineages. Its function is conserved in humans, highlighting its role in convergent differentiation.
Area of Science:
- Developmental biology
- Cell biology
- Genetics
Background:
- Convergent differentiation involves multiple lineages producing identical cell types.
- Molecular mechanisms driving convergent differentiation are not well understood.
Purpose of the Study:
- To identify molecular players involved in convergent differentiation.
- To elucidate the function of the Forkhead transcription factor UNC-130 in C. elegans glial cell development.
Main Methods:
- Investigated the role of UNC-130 in C. elegans glial cell specification.
- Analyzed lineage-specific gene expression and cell differentiation.
- Examined UNC-130 DNA binding activity.
- Assessed functional conservation with human FoxD3.
Main Results:
- UNC-130 is required in only one of three convergent lineages producing the same glial cell type.
- UNC-130 acts transiently as a repressor in progenitors and terminal cells.
- Specification defects correlate with UNC-130 DNA binding.
- Human FoxD3 can functionally replace UNC-130.
Conclusions:
- UNC-130 acts early in a specific lineage to ensure proper cell type specification during convergent differentiation.
- Unlike terminal selectors, UNC-130 regulates distinct progenitor pathways for a common cell type.
- Conserved function of UNC-130 and FoxD3 suggests a fundamental role in lineage-specific differentiation.
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