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Genes for three maize homologs (CenpcA, CenpcB, and CenpcC) of the conserved kinetochore assembly protein known as centromere protein C (CENPC) have been identified. The C-terminal portion of maize CENPC shares similarity with mammalian CENPC and its yeast homolog Mif2p over a 23-amino acid region known as region I. Immunolocalization experiments combined with three-dimensional light microscopy demonstrated that CENPC is a component of the kinetochore throughout interphase, mitosis, and meiosis. It is shown that sister kinetochore separation occurs in two discrete phases during meiosis. A partial separation of sister kinetochores occurs in prometaphase I, and a complete separation occurs in prometaphase II. CENPC is absent on structures known as neocentromeres that, in maize, demonstrate poleward movement but lack other important features of centromeres/kinetochores. CENPC and a previously identified centromeric DNA sequence interact closely but do not strictly colocalize on meiotic chromosomes. These and other data indicate that CENPC occupies an inner domain of the maize kinetochore.

A Maize Homolog of Mammalian CENPC Is a Constitutive Component of the Inner Kinetochore