Open Access Research article

High-throughput capturing and characterization of mutations in essential genes of Caenorhabditis elegans

Jeffrey Shih-Chieh Chu1*, Shu-Yi Chua2, Kathy Wong1, Ann Marie Davison3, Robert Johnsen2, David L Baillie2 and Ann M Rose1

Author Affiliations

1 Department of Medical Genetics, University of British Columbia, Vancouver, Canada

2 Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, Canada

3 Department of Biology, Kwantlen Polytechnic University, Surrey, Canada

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BMC Genomics 2014, 15:361  doi:10.1186/1471-2164-15-361

Published: 12 May 2014

Abstract

Background

Essential genes are critical for the development of all organisms and are associated with many human diseases. These genes have been a difficult category to study prior to the availability of balanced lethal strains. Despite the power of targeted mutagenesis, there are limitations in identifying mutations in essential genes. In this paper, we describe the identification of coding regions for essential genes mutated using forward genetic screens in Caenorhabditis elegans. The lethal mutations described here were isolated and maintained by a wild-type allele on a rescuing duplication.

Results

We applied whole genome sequencing to identify the causative molecular lesion resulting in lethality in existing C. elegans mutant strains. These strains are balanced and can be easily maintained for subsequent characterization. Our method can be effectively used to analyze mutations in a large number of essential genes. We describe here the identification of 64 essential genes in a region of chromosome I covered by the duplication sDp2. Of these, 42 are nonsense mutations, six are splice signal mutations, one deletion, and 15 are non-synonymous mutations. Many of the essential genes in this region function in cell cycle, transcriptional regulation, and RNA processing.

Conclusions

The essential genes identified here are represented by mutant strains, many of which have more than one mutant allele. The genetic resource can be utilized to further our understanding of essential gene function and will be applicable to the study of C. elegans development, conserved cellular function, and ultimately lead to improved human health.

Keywords:
Whole genome sequencing; EMS; Mutagenesis; Essential genes; Balanced mutation; Lethal mutation; C. elegans; Cell cycle