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. 2014 Apr 15;25(8):1298–1311. doi: 10.1091/mbc.E13-11-0687

FIGURE 8:

FIGURE 8:

Models for how MEI-1 contributes to pole focusing by severing microtubules, whereas ASPM-1 cross-links parallel microtubules and KLP-18 promotes bipolarity by cross-linking antiparallel microtubules. (A) MEI-1 may mediate spindle pole assembly by severing chromatin-nucleated microtubules. (B) KLP-18 may promote bipolarity by cross-linking antiparallel microtubules with the help of an unknown factor. ASPM-1 may focus spindle poles by cross-linking the minus ends of parallel microtubules through a dynein-dependent mechanism; consistent with this model, GFP:DHC-1 is nearly absent from meiotic spindles in mei-1(-) oocyte meiotic spindles (Supplemental Figure S3). The recruitment of ASPM-1 to oocyte meiotic spindle poles requires MEI-1; however, it is not known whether this recruitment involves a direct or indirect interaction, and hence this relationship is not depicted.