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Allometry of cell types in planarians by single-cell transcriptomics.

Elena Emili1, Alberto Pérez-Posada1,2,3, Virginia Vanni1,2,3

  • 1Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, UK.

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|May 7, 2025
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Summary
This summary is machine-generated.

This study reveals how cell proportions change with body size in planarians, using single-cell RNA sequencing. Gut basal cells are key to size adaptation, highlighting cell-type allometry.

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Area of Science:

  • Developmental Biology
  • Ecology
  • Genomics

Background:

  • Allometry studies the relationship between body size and biological traits.
  • Cell-type allometry, the study of how cell proportions change with body size, is underexplored.
  • Single-cell RNA sequencing (scRNA-seq) offers novel tools for investigating cellular heterogeneity.

Purpose of the Study:

  • To investigate cell-type allometry in planarians using scRNA-seq.
  • To identify how cell type proportions vary with organism size.
  • To understand the molecular mechanisms underlying size-dependent cellular changes.

Main Methods:

  • Utilized scRNA-seq to analyze cell composition in planarians of varying sizes.
  • Compared gene expression profiles across different cell types and body sizes.
  • Identified regulated gene modules associated with body size changes.

Main Results:

  • Planarians maintain the same basic cell types but alter their proportions based on body size.
  • Gut basal cells showed the most significant changes in proportion with size, suggesting an energy storage role.
  • Specific gene modules were identified as being regulated in response to body size across distinct cell types.

Conclusions:

  • Cell-type allometry is a significant factor in organismal size regulation.
  • Planarian gut basal cells play a crucial role in adapting to changes in body size.
  • scRNA-seq is a powerful technology for dissecting cell-type allometry and its molecular underpinnings.