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Updated: Jun 5, 2025
07:54
Manipulation of Ploidy in Caenorhabditis elegans
Published on: March 15, 2018
10.9K
Somatic polyploidy supports biosynthesis and tissue function by increasing transcriptional output.
Alexander T Lessenger1, Jan M Skotheim1,2, Mathew P Swaffer1,3
1Department of Biology, Stanford University, Stanford, CA, USA.
The Journal of Cell Biology
|December 9, 2024
Summary
Somatic polyploidy in C. elegans intestine drives cell growth and yolk production. Reduced DNA content impairs biosynthesis, affecting offspring development and protein synthesis.
Area of Science:
- Cell Biology
- Developmental Biology
- Genetics
Background:
- Somatic polyploidy is hypothesized to enhance cell size and biosynthesis in demanding tissues.
- The in vivo role of DNA concentration in limiting cellular biosynthesis remains unclear.
Purpose of the Study:
- To investigate the role of polyploidy in Caenorhabditis elegans intestinal cell growth and yolk biosynthesis.
- To understand how DNA concentration affects mRNA levels and gene expression in vivo.
Main Methods:
- Manipulating polyploidization levels in C. elegans intestine.
- Analyzing cell size, mRNA concentration, and RNA Polymerase II loading.
- Assessing offspring production and growth rates.
Main Results:
- Reduced polyploidy led to smaller intestinal cells with diluted mRNA, impacting highly expressed transcripts.
- Lowly expressed genes showed partial compensation via increased RNA Polymerase II binding.
- Polyploidy-deficient animals exhibited reduced offspring production and slower growth due to impaired yolk protein synthesis.
Conclusions:
- Intestinal polyploidy is essential for C. elegans cell growth and yolk biosynthesis.
- DNA dilution affects gene expression, with compensatory mechanisms in place.
- Altered protein synthesis impacts organismal fitness and reproductive success.
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