Question 1

Why are C. elegans worms used as model organisms in research?

Accepted Answer

C. elegans are valuable research models because their small size, transparent bodies, well-characterized genomes, and short three-day life cycles enable rapid genetic and high-throughput studies. Many cellular and molecular pathways are conserved between worms and humans, providing insights into development, aging, neurobiology, and disease mechanisms while reducing reliance on vertebrate models.

Question 2

How are C. elegans cultured and prepared for experiments?

Accepted Answer

C. elegans are cultured on agar plates seeded with E. coli as a bacterial food source. Researchers synchronize worm populations to ensure all individuals reach the same developmental stage, improving experimental consistency. This standardization allows for controlled studies involving chemical compound exposure, environmental stressors, or genetic manipulations.

Question 3

What methods are used to assess outcomes in C. elegans experiments?

Accepted Answer

Experimental outcomes are measured through lifespan and survival rates, locomotion changes such as reduced crawling or paralysis, reproductive output, and fluorescence-based reporter expression. These quantifiable endpoints allow researchers to evaluate the effects of treatments and identify potential therapeutic compounds with precision.

Question 4

How do transgenic C. elegans model neurodegenerative diseases?

Accepted Answer

Transgenic C. elegans express fluorescently labeled polyglutamine proteins in body wall muscle cells, mimicking aggregation-associated proteotoxicity seen in human neurodegenerative diseases like Huntington's disease. As polyQ proteins aggregate, fluorescent puncta become visible and quantifiable, allowing researchers to study disease mechanisms and screen potential therapeutic compounds.

Question 5

What does polyQ aggregation tell researchers about drug effectiveness?

Accepted Answer

A reduction in fluorescent polyQ aggregates following compound treatment indicates the drug's potential therapeutic activity. This measurable suppression or delay of protein aggregation demonstrates the compound's effectiveness and highlights C. elegans' utility for rapid, cost-effective drug screening in neurodegenerative disease research.

Question 6

How do C. elegans compare to other alternative model organisms?

Accepted Answer

Like the fruit fly as an alternative model organism for gene studies, C. elegans offers advantages for genetic research with simpler biology and faster reproduction. However, C. elegans' transparency and fully mapped cell lineage make it particularly suited for developmental and cellular studies, complementing other invertebrate and vertebrate model systems.

Question 7

What ethical guidelines govern C. elegans research procedures?

Accepted Answer

All animal procedures must comply with institutional animal ethics guidelines and IACUC approval. Research must follow the 3Rs principle—Replacement, Reduction, and Refinement—and be conducted by trained personnel. These standards ensure humane treatment while maximizing scientific value and minimizing unnecessary animal use.

代替モデル生物としての線虫

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