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  • Title: Centromere ultrastructure in germ-line chromosomes of Parascaris.
    Author: Goday C, Ciofi-Luzzatto A, Pimpinelli S.
    Journal: Chromosoma; 1985; 91(2):121-5. PubMed ID: 4039246.
    Abstract:
    Ultrastructural analysis of the centromere in germ-line mitotic chromosomes of Parascaris univalens and Parascaris equorum revealed that these chromosomes are holocentric. In thin longitudinal sections of both species the kinetochore appeared as a continuous plate (up to 3.8 micron long) and displayed a layered structure. This structure consisted of electron-dense inner and outer layers (average width 10 nm) separated by a less dense middle layer (25 nm wide), which had transverse electron-dense bars (10 nm wide) regularly spaced every 25-30 nm. Thus the ladderlike kinetochore profile observed in Parascaris gonial mitotic chromosomes represents a different type of organization from that of the classical trilaminar kinetochore found in both holocentric and monocentric chromosomes.
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