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Expression of the rig gene in mouse oocytes and early embryos


Expression of the rig gene in mouse oocytes and early embryos



Molecular Reproduction and Development 28(4): 319-324



ISSN/ISBN: 1040-452X

PMID: 2064774

DOI: 10.1002/mrd.1080280402

A clone selected from a two-cell mouse embryo cDNA library has been sequenced and identified as rig cDNA. The rig gene codes for a highly conserved nuclear protein, which may have a general role in cell growth or replication (Shiga et al.: Proc Natl Acad Sci USA 87:3594, 1990). The quantitative changes in rig mRNA were studied in blot hybridization experiments with total RNA from oocytes and early embryos. The amount and relative abundance of rig mRNA change considerably during early development. There are about 1.6 x 10(4) rig mRNA molecules in a late growth-stage oocyte; this number is reduced to about one-tenth in the ovulated egg but increases about twenty-fold during cleavage through the blastocyst stage. In F9 embryonal carcinoma cells, the relative abundance of rig mRNA is similar to that in blastocysts (about 0.1% of the mRNA population), but it is about eight-fold higher in the mouse myeloma cell line MOPC-104E. The high level of rig mRNA in late growth-stage oocytes suggests that the rig gene product may be important for overall transcriptional activity rather than DNA replication and mitosis. Alternatively, the rig protein may be a storage product of oogenesis and have a role in the initiation of development.

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Accession: 002105852

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