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Related Experiment Video

Updated: Apr 5, 2026

Optogenetic Random Mutagenesis Using Histone-miniSOG in C. elegans

Optogenetic Random Mutagenesis Using Histone-miniSOG in C. elegans

Published on: November 14, 2016

Wild worm embryogenesis harbors ubiquitous polygenic modifier variation.

Annalise B Paaby¹, Amelia G White¹, David D Riccardi¹

¹Department of Biology and Center for Genomics and Systems Biology, New York University, New York, United States.

|August 23, 2015

Summary

Wild-type genomes contain hidden genetic variations that modify gene function only when other genes are disrupted. These cryptic genetic variations (CGV) reveal the complex genetic architecture underlying traits like embryogenesis.

Keywords:

C. elegans cryptic genetic variation evolutionary biology genetic background genomics modifier variation

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Area of Science:

Developmental Biology
Genetics
Evolutionary Biology

Background:

Embryogenesis is a fundamental biological process that exhibits species-specific evolution.
Essential processes may accumulate cryptic genetic variation (CGV), which influences gene function under specific conditions.

Purpose of the Study:

To investigate cryptic genetic variation (CGV) in natural populations of *Caenorhabditis elegans*.
To understand how segregating genetic variants modify the penetrance of embryonic lethality.

Main Methods:

Adaptation of a classical modifier screen.
Induction of gene knockdowns in *C. elegans*.
Application of quantitative genetic methodology to analyze segregating alleles.

Main Results:

Each gene perturbation revealed cryptic genetic variation (CGV).
Wild-type genomes harbor numerous genetic modifiers that collectively impact phenotype penetrance.
Phenotypes are polygenic, influenced by many modifiers, but alleles exhibit low pleiotropy, acting specifically.

Conclusions:

The study demonstrates the widespread nature of conditional functionality in complex trait architecture.
Genetic variation segregating in natural populations significantly influences the penetrance of developmental phenotypes.
Understanding CGV is crucial for comprehending the evolution and robustness of essential biological processes.