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Partially compromised specification causes stochastic effects on gut development in C. elegans.

Hailey Choi1, Gina Broitman-Maduro2, Morris F Maduro2

  • 1Department of Biology, University of California, Riverside, CA 92521, United States; Graduate program in Cell, Molecular and Developmental Biology, University of California, Riverside, CA 92521, United States.

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Summary
This summary is machine-generated.

Perturbing the specification of the C. elegans E cell leads to variable gut fate and hyperplasia in its descendants. However, the developing intestine can accommodate these changes to form a normal structure.

Keywords:
C. elegansCell specificationEndodermGene regulatory networksHyperplasiaMorphogenesisRobustness

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • The C. elegans intestine develops from the E progenitor cell through precise cell divisions and morphogenetic events.
  • The impact of disruptions in early cell specification on later organogenesis remains incompletely understood.

Purpose of the Study:

  • To investigate how compromising the specification of the E cell affects the fate of its descendants and subsequent gut organogenesis in C. elegans.
  • To analyze the relationship between the severity of specification defects and the resulting lineage and differentiation abnormalities.

Main Methods:

  • Generated an allelic series of C. elegans strains with compromised E cell specification by perturbing end-1 and end-3 gene activation.
  • Utilized lineage tracing markers to track all E cell descendants and fate-mapping markers to identify gut cells.
  • Examined the activation timing and protein levels of the gut differentiation factor elt-2 using reporter assays.

Main Results:

  • Partial compromise in E cell specification resulted in E lineage hyperplasia and stochastic, variable adoption of gut fate among descendants.
  • Activation of the elt-2 gene was delayed in these mutants, though final ELT-2::GFP protein levels were comparable to wild type.
  • A stronger specification defect correlated with more severe E lineage defects and greater elt-2 activation delay.

Conclusions:

  • Upstream perturbations in E cell specification significantly impact the E lineage and gut fate determination in C. elegans.
  • Despite lineage abnormalities, the developing intestine can accommodate supernumerary gut cells, leading to relatively normal organogenesis if sufficient descendants adopt a gut fate.