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Related Experiment Videos

Ribosomal protein gene expression is cell type specific during development in Dictyostelium discoideum.

A K Agarwal1, S N Parrish, D D Blumberg

  • 1Department of Biological Science, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.

Differentiation; Research in Biological Diversity
|November 7, 1999
PubMed
Summary

Amino acid starvation triggers Dictyostelium discoideum development. Ribosomal protein mRNA is selectively lost from prespore cells, but retained in prestalk cells, suggesting cell-type-specific regulation.

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Area of Science:

  • Cellular biology
  • Developmental biology
  • Molecular genetics

Background:

  • Amino acid starvation initiates the developmental cycle in Dictyostelium discoideum.
  • Early development involves selective loss of ribosomal protein (r-protein) mRNAs from polysomes.
  • This mRNA loss is mediated by sequences in the 5' non-translated leader of r-protein mRNAs.

Purpose of the Study:

  • To investigate the cell-type-specific expression of ribosomal protein genes during Dictyostelium development.
  • To determine if ribosomal protein synthesis is differentially regulated in prestalk versus prespore cells.

Main Methods:

  • Fusion of ribosomal protein gene promoters and 5' non-translated leaders (rp-L11 and rp-S9) to the Escherichia coli beta-galactosidase reporter gene.
  • In situ detection of beta-galactosidase enzyme activity in Dictyostelium cells during development.

Related Experiment Videos

  • Analysis of reporter gene expression in prestalk and prespore cell populations.

    • Main Results:

    • Beta-galactosidase activity was detected in most growing cells.
    • By 15 hours of development, beta-galactosidase activity was significantly reduced in prespore cells.
    • Strong beta-galactosidase activity persisted in prestalk cells.

    Conclusions:

    • Ribosomal protein genes are expressed in prestalk cells during starvation-induced development.
    • Cells differentiating into the prespore pathway shut off ribosomal protein synthesis.
    • These findings suggest that ribosomal protein mRNAs are excluded from polysomes in a cell-type-specific manner, contributing to developmental regulation.