Clathrin is one of the leading players in the endocytic process during oocyte maturation. Immunofluorescence and transmission electron analysis on fully-grown germinal vesicle (GV) mouse oocytes shows Clathrin localization on the cortical region with three peculiar patterns: complete, incomplete, and half-moon. The first configuration is characterized by Clathrin lattices along the cortex; the second is represented by Clathrin lattices interrupted by invaginations forming coated vesicles as an indication of active endocytosis. The half-moon profile, the less frequent but the most interesting one, refers to Clathrin lattices distributed to one-half of the cell. The in vivo analysis of organelles' positioning and cytoplasmic rearrangements, performed to understand the possible relation between endocytosis and oocyte maturation, suggests that the half-moon pattern indicates those fully-grown oocytes that may have likely undergone Germinal Vesicle Breakdown, MI, and MII. Our results show that, before oocytes undergo maturation, Clathrin localizes on the side of the cell, opposite to future spindle migration, thus marking spindle orientation in mouse oocytes.
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