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Loss- and Gain-of-function Approach to Investigate Early Cell Fate Determinants in Preimplantation Mouse Embryos
Published on: June 6, 2016
Expression dynamics of microRNA biogenesis during preimplantation mouse development
Jesús García-López1, Jesús del Mazo
1Department of Cell Proliferation and Development, Consejo Superior de Investigaciones Cientificas, Madrid, Spain.
Biochimica Et Biophysica Acta
|April 10, 2012
Summary
MicroRNA (miRNA) processing capacity diminishes after fertilization in mice, potentially reducing miRNA activity. However, stockpiles of precursor and mature miRNAs may ensure functional miRNA availability during early development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- The role of microRNAs (miRNAs) in regulating maternal messenger RNAs (mRNAs) during early embryonic development is not fully understood.
- Post-transcriptional regulation by miRNAs is critical for developmental processes.
Purpose of the Study:
- To investigate the regulation of miRNA processing during mouse preimplantation development.
- To quantify the expression of key genes involved in miRNA biogenesis and function from oocyte to blastocyst stages.
Main Methods:
- Quantitative analysis of gene expression for miRNA processing machinery components (Drosha, Dgcr8, Exportin 5, Dicer, Ago1-5).
- Assessment of miRNA precursor and mature forms, including miRNA-mRNA interactions, in blastocysts.
Main Results:
- Expression of most miRNA biogenesis genes (Drosha, Dgcr8, Exportin 5, Dicer, Ago2-5) decreased after the zygotic stage.
- Specific Argonaute (Ago) genes showed transient increases at different cleavage stages (Ago1, 3, 4 in 2-cell; Ago2 in 4- and 8-cell embryos).
- Evidence of miRNA stockpiles (precursor/mature forms, miRNA-mRNA complexes) for specific miRNAs (e.g., miR-292) in blastocysts.
Conclusions:
- Canonical miRNA processing capacity appears to decrease post-fertilization in mice.
- Potential miRNA stockpiles may buffer functional miRNA supply during early development.
- This suggests a dynamic regulation of miRNA activity critical for preimplantation development.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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