KATANIN, p60 SUBUNIT, A1; KATNA1 OKDB#: 2099
 Symbols: KATANIN, p60 SUBUNIT, A1; KATNA1 Species: human
 Synonyms:  Locus: 6 in Homo sapiens


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General Comment Yang H, et al 2003 reported that MEI-1/katanin is required for translocation of the meiosis I spindle to the oocyte cortex in C. elegans small star, filled. In most animals, successful segregation of female meiotic chromosomes involves sequential associations of the meiosis I and meiosis II spindles with the cell cortex so that extra chromosomes can be deposited in polar bodies. The resulting reduction in chromosome number is essential to prevent the generation of polyploid embryos after fertilization. Using time-lapse imaging of living Caenorhabditis elegans oocytes containing fluorescently labeled chromosomes or microtubules, we have characterized the movements of meiotic spindles relative to the cell cortex. Spindle assembly initiated several microns from the cortex. After formation of a bipolar structure, the meiosis I spindle translocated to the cortex. When microtubules were partially depleted, translocation of the bivalent chromosomes to the cortex was blocked without affecting cell cycle timing. In oocytes depleted of the microtubule-severing enzyme, MEI-1, spindles moved to the cortex, but association with the cortex was unstable. Unlike translocation of wild-type spindles, movement of MEI-1-depleted spindles was dependent on FZY-1/CDC20, a regulator of the metaphase/anaphase transition. We observed a microtubule and FZY-1/CDC20-dependent circular cytoplasmic streaming in wild-type and mei-1 mutant embryos during meiosis. We propose that, in mei-1 mutant oocytes, this cytoplasmic streaming is sufficient to drive the spindle into the cortex. Cytoplasmic streaming is not the normal spindle translocation mechanism because translocation occurred in the absence of cytoplasmic streaming in embryos depleted of either the orbit/CLASP homolog, CLS-2, or FZY-1. These results indicate a direct role of microtubule severing in translocation of the meiotic spindle to the cortex.

NCBI Summary: Microtubules, polymers of alpha and beta tubulin subunits, form the mitotic spindle of a dividing cell and help to organize membranous organelles during interphase. Katanin is a heterodimer that consists of a 60 kDa ATPase (p60 subunit A 1) and an 80 kDa accessory protein (p80 subunit B 1). The p60 subunit acts to sever and disassemble microtubules, while the p80 subunit targets the enzyme to the centrosome. This gene encodes the p80 subunit. This protein is a member of the AAA family of ATPases.
General function Cytoskeleton
Comment
Cellular localization Cytoplasmic
Comment
Ovarian function Oogenesis
Comment Meiotic spindle: sculpted by severing. Ribbeck K et al. Katanin is a conserved AAA ATPase with the ability to sever microtubules, but its biological function in animal cells has been obscure. A recent study using electron tomography has found that katanin stimulates the production of microtubules in the meiotic spindles of Caenorhabditis elegans oocytes.
Expression regulated by
Comment
Ovarian localization Oocyte
Comment
Follicle stages
Comment
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created: 2003-08-07 09:33:40 by: Aaron J Hsueh, hsuehlab   email: aaron.hsueh@stanford.edu
home page: http://reprobio.stanford.edu/hsueh
last update: 2006-11-09 13:06:31 by: Aaron J Hsueh, hsuehlab   email: aaron.hsueh@stanford.edu



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