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We have examined the expression of SRY mRNA in individual in vitro fertilized preimplantation human embryos; because of ethical constraints, these studies were confined to embryos with one and three pronuclei. Using a sensitive reverse transcriptase-polymerase chain reaction (RT-PCR) assay, we observed SRY mRNA at the one-cell through the blastula stages but not in spermatozoa. These results indicate that the de novo transcription of this sex-specific gene occurs at a developmental time considerably earlier than that of gonadal differentiation. Our results also indicate that in vitro fertilized embryos with one pronucleus are likely to be diploid.
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