Abstract
Cell division is a fundamental area of giardial cell biology and pathogenesis that is likely amenable to antiparasitic drugs. The giardial life cycle is characterized by a binucleate swimming trophozoite stage that colonizes the small intestine by undergoing rapid cell division and attachment, and a presumably dormant cyst stage that persists in the environment. Genome replication and cell division occur during the trophozoite stage, and again prior to encystation, although the details of cytoskeletal rearrangements during encystation/excystation remain unclear. During cell division in trophozoites, the two diploid nuclei first undergo mitosis and later the eight flagella and ventral disc are duplicated and partitioned into two daughter cells. Giardia trophozoites possess a semi-open mitosis with two extranuclear spindles which access chromatin through polar openings in the nuclear membranes. The two nuclei migrate to the cell midline in prophase with lateral chromosome segregation in the left-right axis and cytokinesis along the longitudinal plane (perpendicular to the spindles). This ensures that each daughter inherits one copy of each parental nucleus with mirror image symmetry. Before the completion of mitosis, the daughter flagella undergo a maturation process in which the parent flagella migrate and transform to different flagellar types and new flagella are built. During encystation, the flagella are internalized within the cyst, but do not completely resorb. Daughter discs are formed de novo, and likely are neither templated nor built from components of the parental disc. The two new daughter discs are assembled on the dorsal side of the cell in late telophase, and the parental disc is reorganized and disassembled, presumably to maintain attachment during division. The processes of mitosis, flagellar division, and disc division have only recently been investigated at the molecular and cellular levels, but each likely involves microtubule motors such as kinesins and dyneins to generate forces for repositioning of organelles during cell division.
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Dawson, S.C., Nohýnková, E., Cipriano, M. (2011). Cell Cycle Regulation and Cell Division in Giardia . In: Luján, H.D., Svärd, S. (eds) Giardia. Springer, Vienna. https://doi.org/10.1007/978-3-7091-0198-8_10
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