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  • Essay / Mutations in flagellar proteins determine movement and...

    INTRODUCTIONChlamydomonas reinhardtii is a single-celled eukaryotic green alga commonly found throughout the world. This photosynthetic organism has two flagella which serve as the basis for its motility. Not only is this organism easily accessible, but it is a model organism for many areas of study (Rochaix et al, Silflow and Lefebvre 2001) including photosynthesis, respiration, flagella, circadian rhythm, cell recognition to cell and even homeostasis and tolerance to heavy metals. (Mr Hanikenne). The flagella of C. reinhardtii are easily visible and are remarkably similar to the microtubular structures of other mammals (Silflow and Lefebvre 2001). This makes it possible to carry out experimental studies likely to help understand human diseases linked to the dysfunction of microtubular structures in the human body. Since these organisms are capable of maintaining life in the absence of their flagella, they become a model organism for the study of defects in movement, regeneration and mutation. The flagella are easily removed without damaging the cell and simplify the analysis of flagellar proteins. Genetic analysis of mutant strains is easily accessible thanks to the complete sequencing of their genomes (Lefebvre and Silflow 1999). Although the flagellum does not have a life-sustaining role in this organism, it remains very beneficial throughout its life cycle. Like all chlorophyll-producing plants, C. reinhardtii requires light to support its cellular functions. To improve its ability to receive the ideal amount, it is able to detect light with an eyespot and use these signals to control the beating of its flagella (Witman GB 1993). C. reinhardtii is capable of propelling itself forward through the opposite and simultaneous medium...... middle of paper ......4.4. Porter, ME 1996. Axonemal dyneins: assembly, organization and regulation. Curr. Notice. Cellular biol. 8:10 a.m.-7:5 p.m. Rochaix JD, Goldschmidt-Clermont M, Merchant S. 1998. The molecular biology of chloroplasts and mitochondria in Chlamydomonas. Dordrecht, Netherlands: Kluwer Academic Publishers.6. Silflow CD, Lefebvre PA. 2001. Assembly and motility of eukaryotic cilia and flagella. Lessons from Chlamydomonas reinhardtii. Plant Physiology 127:1500-1507.7. Wang, Liang et. al., Flagellar regeneration requires depolymerization of cytoplasmic microtubules and kinesin-13. (2013). Journal of Cellular Science 126, 1531-1540.8. Warner, F.D. & Satir, P. 1974. The structural basis of ciliary curvature formation: changes in position of radial spokes accompanying microtubule sliding. J. Cell Biol. 63:35-63.9. Witman GB. 1993. Phototaxis Chlamydomonas. Cell Biol Trends; 3:403-8