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ORC proteins in the mammalian zygote

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Abstract

The origin recognition complex (ORC) proteins, ORC1-6, are the first known proteins that bind DNA replication origins to mark the competency for the initiation of DNA synthesis. These proteins have complex mechanisms of assembly into the ORC complex and unexpected localizations in the mitotic chromosomes, cytoplasm, and nuclear structures. The mammalian zygote is a potentially important model that may contribute to our understanding of the mechanisms and features influencing origin establishment and in the identification of other functions of the ORC proteins. Together with expected localizations to the chromatin during G1, we found an unexpected distribution in the cytoplasm that appeared to accumulate ORC proteins suggesting potential roles for ORC subunits in mitosis and chromatin segregation. ORC1, 2, 3, and 5 all localize to the area between the separating maternal chromosomes shortly after fertilization. ORC4 forms a cage around the set of chromosomes that will be extruded during polar body formation before it binds to the chromatin shortly before zygotic DNA replication. These data suggest that the ORC proteins may also play roles in preparing the cell for DNA replication in addition to their direct role in establishing functional replication origins.

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Authors and Affiliations

  1. Institute for Biogenesis Research, Department of Anatomy, Biochemistry & Physiology, John A. Burns School of Medicine, University of Hawaii at Mānoa, 1960 East-west Road, Honolulu, HI 96822, USA

    Michael A. Ortega, Hieu Nguyen & W. Steven Ward

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  1. Michael A. Ortega
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  2. Hieu Nguyen
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  3. W. Steven Ward
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Correspondence to W. Steven Ward.

Additional information

This work was supported by NIH Grant HD060722 to W.S.W.

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Ortega, M.A., Nguyen, H. & Ward, W.S. ORC proteins in the mammalian zygote. Cell Tissue Res 363, 195–200 (2016). https://doi.org/10.1007/s00441-015-2296-3

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