Related Experiment Videos
Specific maternal transcripts in bovine oocytes and cleavaged embryos: identification with novel DDRT-PCR methods
Kyu-Chan Hwang1, Sae-Young Park, Se-Pill Park
1Department of Animal Science, Chungbuk National University, Gaesin-dong, Cheongju, Chungbuk, South Korea.
Molecular Reproduction and Development
|April 2, 2005
Summary
Researchers identified four key genes (DNCL1, ZP2, FANK1, GTL3) predominantly expressed in bovine oocytes. These maternally-derived transcripts are crucial for early preimplantation development, with expression decreasing significantly by the 8-cell stage.
Area of Science:
- Reproductive Biology
- Developmental Biology
- Genomics
Background:
- Understanding gene expression dynamics during early embryonic development is crucial for reproductive success.
- Maternally-derived transcripts play a significant role in the initial stages of preimplantation development.
- Identifying specific genes expressed in oocytes and early embryos can provide insights into developmental regulation.
Purpose of the Study:
- To identify and characterize differentially expressed genes in bovine germinal vesicle (GV) oocytes and in vitro-produced early-stage embryos.
- To analyze the temporal expression patterns of these identified genes throughout preimplantation development.
- To investigate the potential roles of these genes as maternally-derived transcripts in early development.
Main Methods:
- Annealing Control Primer (ACP)-based Differential Display Reverse Transcription Polymerase Chain Reaction (DDRT-PCR) was employed to isolate differentially expressed amplicons.
- Four specific expressed sequence tags (ESTs) predominantly expressed in GV oocytes were cloned and sequenced.
- Real-time quantitative PCR (qPCR) with fluorescence monitoring was used to quantify and analyze the temporal expression of target transcripts.
Main Results:
- Four ESTs, showing high sequence similarity to known bovine genes (DNCL1, ZP2) and other species' ESTs (FANK1, GTL3), were identified.
- Real-time qRT-PCR confirmed that DNCL1, FANK1, GTL3, and ZP2 transcripts were highly expressed in GV stage oocytes.
- Expression of these four transcripts gradually decreased from the GV stage to the 8-cell stage embryo, with no detection in later stages. Similar upregulation was observed in mouse GV oocytes and metaphase II stages.
Conclusions:
- The identified genes (DNCL1, FANK1, GTL3, ZP2) are specifically and predominantly expressed in bovine GV oocytes.
- These four differentially expressed orthologous genes likely function as maternally-derived transcripts essential for early preimplantation development.
- Their expression patterns suggest a critical role in the transition from oocyte to early embryonic stages.