Related Experiment Videos
Expression of SRY transcripts in preimplantation human embryos
M Fiddler1, B Abdel-Rahman, D A Rappolee
1Department of Obstetrics and Gynecology, Northwestern University Medical School, Chicago, Illinois, USA.
American Journal of Medical Genetics
|January 2, 1995
Summary
SRY mRNA is transcribed early in human embryo development, before gonadal differentiation. This finding sheds light on the initial stages of sex determination in vitro fertilized embryos.
Area of Science:
- Developmental Biology
- Human Embryology
- Genetics
Background:
- The SRY gene is crucial for male sex determination.
- Understanding SRY gene expression in early human embryos is vital for developmental studies.
Purpose of the Study:
- To investigate the expression of SRY mRNA in in vitro fertilized (IVF) human preimplantation embryos.
- To determine the temporal expression pattern of SRY mRNA during early embryogenesis.
Main Methods:
- Utilized a sensitive reverse transcriptase-polymerase chain reaction (RT-PCR) assay.
- Analyzed SRY mRNA expression in individual IVF human embryos at one-cell through blastula stages.
- Included embryos with one and three pronuclei due to ethical constraints.
Main Results:
- SRY mRNA was detected in human embryos from the one-cell to blastula stages.
- SRY mRNA was not found in spermatozoa.
- De novo transcription of SRY occurs earlier than gonadal differentiation.
- One-pronucleus IVF embryos are likely diploid.
Conclusions:
- SRY gene transcription begins early in human preimplantation development.
- This early expression precedes morphological signs of gonadal differentiation.
- The study provides insights into the molecular events of early human sex determination.