Sperm flagella

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DOI: Experimental research using spermatozoa, a highly specialized cell with organelles involved in gene transfer, energy supply and cellular motility, has always occupied the forefront of studies in cell and reproductive biology. Several spermatological experiments have focused on the attraction of a spermatozoon toward the egg — sperm chemotaxis or sperm guidance.

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JavaScript is disabled for your browser. Some features of this site may not work without it. Mammalian sperm flagella and cilia Author: Guan, Jikui.

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The axoneme represents a cylindrical scaffold of microtubular doublets arranged around a pair of single microtubules and assorted along the entire length with the dynein-ATPase motors. The mechanisms of wave generation along the flagellum becomes possible due to sliding of microtubules relative to each other and their propagation is a result of a balance between mechanical constraints and intra-flagellar biochemical actors that generate force. Cytoskeleton - Structure, Dynamics, Function and Disease.

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Sperm is the male reproductive cell. In the types of sexual reproduction known as anisogamy and its subtype oogamythere is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. A uniflagellar sperm cell that is motile is referred to as a spermatozoonwhereas a non-motile sperm cell is referred to as a spermatium.

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They are functionally diverged to play cell-type-specific roles even in a multicellular organism. Although their structural components are therefore believed to be common, few studies have investigated the molecular diversity of the protein components of the cilia and flagella in a single organism. Here we carried out a proteomic analysis and compared protein components between branchial cilia and sperm flagella in a marine invertebrate chordate, Ciona intestinalis.

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A flagellate can have one or several flagella. The primary function of a flagellum is that of locomotionbut it also often functions as a sensory organellebeing sensitive to chemicals and temperatures outside the cell. Flagella are organelles defined by function rather than structure.

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Echinoderms - Fertilization Sperm structure and motility. Sea urchin sperm can be obtained in large quantities, because sea urchins, like many marine invertebrates, engage in broadcast spawningi. A male Arbacia punctulata spawning its whitish semen.

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Sperm motility is necessary for the transport of male DNA to eggs in species with both external and internal fertilization. Flagella comprise several proteins for generating and regulating motility. Central cytoskeletal structures called axonemes have been well conserved through evolution.

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Sperm motility is necessary for the transport of male DNA to eggs in species with both external and internal fertilization. Flagella comprise several proteins for generating and regulating motility. Central cytoskeletal structures called axonemes have been well conserved through evolution.

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We find flagellar excursions into the Z-plane nearly as large as the envelope of the flagellar waveform projected onto the XY-plane. These Z-plane excursions travel as waves down the flagellum each beat cycle. DHM also tracks the heads of free-swimming sperm and the dynamics and chirality of rolling of sperm around their long axis. We find that mouse sperm roll CW at the maximum positive Z-plane excursion of the head, then roll CCW at the subsequent maximum negative Z-plane excursion.

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