Prolonging somatic cell proliferation through constitutive hox gene expression in C. elegans
Svenia D Heinze1,2, Simon Berger1,3, Stefanie Engleitner1,2
1Department of Molecular Life Sciences, University Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland.
Nature Communications
|October 27, 2023
Summary
Hox genes control cell proliferation timing in C. elegans. Constitutive hox gene expression can prolong somatic cell division, suggesting their down-regulation limits adult regeneration.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- Hox genes are crucial for body segment identity and stem cell function in development.
- Unlike higher organisms, C. elegans somatic cells exit the cell cycle permanently after lineage completion, preventing adult regeneration.
Purpose of the Study:
- To investigate the role of hox gene expression levels in regulating somatic cell proliferation timing in C. elegans.
- To determine if hox gene expression can override normal cell cycle arrest in adult somatic cells.
Main Methods:
- Manipulating the expression of the central hox gene lin-39 in specific C. elegans cell types (vulval cells, anchor cells).
- Observing the effects of altered lin-39 expression on cell cycle progression and proliferation.
- Analyzing the impact of ectopic hox gene expression in quiescent cells.
Main Results:
- Down-regulation of lin-39 in dividing vulval cells led to premature cell cycle exit.
- Constitutive lin-39 expression induced precocious cell divisions and extended the proliferative period of vulval cells.
- Ectopic hox gene expression in quiescent anchor cells reactivated the cell cycle and promoted proliferation into adulthood.
Conclusions:
- Hox gene expression levels dictate the temporal competence of somatic cells to proliferate in C. elegans.
- Sustained expression of a single hox transcription factor can extend somatic cell proliferation beyond normal lineage restrictions.
- Reduced hox gene expression at the end of larval development may contribute to the lack of adult somatic cell proliferation in C. elegans.
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