We have examined the murine genes encoding transcription factors E2F1, -3,
-5 and -6 in gametes and early embryos. All genes are expressed as maternal
transcripts and all are efficiently transcribed after the blastocyst stage
. Between those two stages, each E2F mRNA is transcribed with a distinctive
and unique pattern. E2F proteins are also differentially expressed and com
partmentalized in pre-implantation embryos. (C) 2000 Elsevier Science Irela
nd Ltd. All rights reserved.