Differences in gene expression between mouse and human for dynamically regulated genes in early embryo.

Area of Science:

• Developmental Biology
• Genomics
• Reproductive Medicine

Background:

• Infertility affects millions globally, with in vitro fertilization (IVF) as a primary treatment.
• Advancing IVF necessitates a deeper understanding of human preimplantation development at the molecular level.
• Current research often uses mouse models, but species-specific differences may exist.

Purpose of the Study:

• To identify key genes involved in human preimplantation development.
• To compare gene expression patterns between early human and mouse development.
• To investigate potential differences impacting IVF outcomes.

Main Methods:

• Analysis of human microarray data and public databases to identify candidate genes.
• Selection of 70 candidate genes for further investigation.
• Comparative expression analysis of selected genes in early mouse development (oocyte to 8-cell stage).

Main Results:

• Maternally inherited genes showed expected decreased expression in both human and mouse embryos.
• 25 genes upregulated post-fertilization in humans included 13 whose mouse orthologs exhibited different expression patterns.
• Significant disparities in gene expression profiles were observed between human and mouse preimplantation stages.
• Four cancer-testis antigen families (PRAME, SSX, GAGE, MAGEA) were highly expressed in human embryos.

Conclusions:

• Human and mouse preimplantation development exhibit substantial differences in gene expression.
• These species-specific differences may influence the efficacy of IVF treatments.
• Identification of key developmental genes and cancer-testis antigens offers new insights into human embryogenesis.