Acrylamide-responsive genes in the nematode Caenorhabditis elegans

Area of Science:

• Toxicology
• Molecular Biology
• Genomics

Background:

• Acrylamide is a neurotoxin and potential human carcinogen found in fried or baked foods.
• Its formation in food was reported in 2002, prompting further investigation into its biological effects.

Purpose of the Study:

• To investigate the genomic and proteomic responses of Caenorhabditis elegans (C. elegans) to acrylamide exposure.
• To identify genes and proteins involved in acrylamide detoxification.
• To develop a C. elegans-based tool for detecting acrylamide.

Main Methods:

• Genomic and proteomic analyses of C. elegans exposed to acrylamide.
• Profiling of gene expression changes (upregulation and downregulation).
• Analysis of glutathione S-transferase (GST) gene expression and regulation by SKN-1.
• Development and use of a gst-4::gfp reporter strain for acrylamide detection.

Main Results:

• Acrylamide exposure upregulated 409 genes and downregulated 111 genes in C. elegans.
• Upregulated genes included major detoxification enzymes, with a strong emphasis on GSTs.
• GST gene expression varied, and their regulation involved the transcription factor SKN-1.
• The gst-4::gfp reporter strain detected acrylamide in a dose- and time-dependent manner.

Conclusions:

• C. elegans mounts a significant detoxification response to acrylamide, involving numerous GSTs regulated by SKN-1.
• The gst-4::gfp reporter strain is a promising tool for rapid, inexpensive detection of acrylamide in food.
• This model system can be used to study mechanisms of GST induction by acrylamide and other stressors.