Quantifying phenotypic variation in isogenic Caenorhabditis elegans expressing Phsp-16.2::gfp by clustering 2D...

Area of Science:

• Genetics and Molecular Biology
• Developmental Biology
• Animal Model Systems

Background:

• Isogenic populations exhibit significant phenotypic variation.
• GFP reporters in Caenorhabditis elegans can predict longevity and stress resistance.
• Understanding the sources of this variation is crucial.

Purpose of the Study:

• To investigate residual variation in GFP reporter expression in isogenic Caenorhabditis elegans.
• To identify distinct expression patterns within bright and dim phenotypic groups.
• To explore the role of intestinal cells in observed expression patterns.

Main Methods:

• Utilized a GFP reporter in isogenic Caenorhabditis elegans populations.
• Separated worms into brightest and dimmest 3% based on GFP expression.
• Developed and applied a novel image processing method for direct worm image analysis.
• Validated findings using confocal microscopy.

Main Results:

• Distinct relative expression patterns were observed between bright and dim worm groups.
• Bright worms showed correlated expression patterns, while dim worms segregated into two distinct patterns.
• Confocal microscopy confirmed that intestinal cells are the primary source of fluorescence.
• Specific clusters in dim worms were linked to highly active intestinal cells.

Conclusions:

• A novel image analysis method can reveal complex expression patterns in Caenorhabditis elegans.
• Intestinal cell activity appears to be a significant factor in observed phenotypic variation.
• Further research into intestinal cell function can enhance understanding of C. elegans phenotypic variation.