Nuclear lamin antigens are developmentally regulated during porcine and bovine embryogenesis.

Biology of Reproduction
R S PratherG Schatten

Abstract

The nuclear lamins, proteins that reside on the inner face of the nuclear envelope, are thought to provide attachment sites for anchoring the chromatin to the nuclear envelope, thus facilitating the overall organization of the nucleus. The composition of the nuclear lamin proteins changes during differentiation and development in a variety of mammalian and nonmammalian tissues. Bovine and porcine oocytes and early embryos were prepared for immunocytochemical detection of nuclear lamins using three different antibodies (recognizing lamin B, lamins A/B/C, or lamins A/C). In both species, germinal vesicle nuclei and early cleavage stage nuclei react positively with the antibodies. However, on nuclei of bovine embryos, the A/C epitope was not detectable at the 16-cell stage, compact morula, spherical blastocyst, or the chorionic cell nuclei of a Day 35 conceptus, but was detectable on both amniotic and embryonic ectodermal cell nuclei of a Day 35 conceptus. All three antibodies reacted with nuclei from two bovine tissue culture cell lines (bovine embryonic cells and Madin-Darby bovine kidney cells) and one porcine kidney cell line. Nuclei in porcine embryos followed a similar pattern, except the loss of the A/C epitope occurred at ...Continue Reading

Citations

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