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Accumulation of RNA in blastocysts during embryonic diapause and the periimplantation period in the western spotted skunk

✍ Scribed by Mead, Rodney A. ;Rourke, A. W.

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
541 KB
Volume
235
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The in vivo incorporation of ^3^H‐uridine into RNA was studied in delayed implanting and activated blastocysts obtained from 33 western spotted skunks. ^3^H‐uridine was incorporated into RNA by all blastocysts; however, significantly more label was incorporated as blastocyst diameter increased. Activated blastocysts with diameters of 1.6 mm or greater on average incorporated 65 times more ^3^H‐precursor in 5 hr than diapausing blastocysts with diameters of 1.1 mm or less. Polyadenylated RNA was likewise synthesized by delayed implanting and activated skunk blastocysts; however, the proportion of polyadenylated RNA synthesized by the former was greater than in the latter (43.9% vs. 27.5%). Our data suggest that the transition from embryonic diapause to fully activated blastocysts first occurs gradually for several days before entering a 1–2‐day period of rapid development characterized by an abrupt increase in RNA accumulation.

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