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Published on: January 29, 2020
Microarray analysis of microRNA expression during axolotl limb regeneration
Edna C Holman1, Leah J Campbell, John Hines
1Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut, United States of America.
Plos One
|October 3, 2012
Summary
MicroRNAs, like miR-21, are involved in axolotl limb regeneration. This study found miR-21 is upregulated in blastemas and targets Jagged1, a key developmental gene.
Area of Science:
- Regenerative Biology
- Molecular Biology
- Developmental Biology
Background:
- Salamanders, including axolotls (Ambystoma mexicanum), exhibit remarkable regenerative capabilities.
- While developmental genes are known to be reactivated during limb regeneration, the role of microRNAs remains largely unexplored.
- MicroRNAs (miRNAs) are critical regulators of gene expression, influencing cell fate and morphogenetic processes.
Purpose of the Study:
- To investigate the dynamic changes in microRNA expression during axolotl limb regeneration.
- To identify specific microRNAs and their target genes involved in the regenerative process.
- To explore the functional relationship between miR-21 and Jagged1 during salamander limb regeneration.
Main Methods:
- Comparative analysis of microRNA expression profiles using microarray platforms between regenerating limb blastemas and non-regenerating stump tissues.
- Validation of differential microRNA expression using Northern blot and quantitative RT-PCR (qRT-PCR).
- Identification and functional validation of putative microRNA target genes, including cloning of the 3' untranslated region (3'UTR) and in vitro assays.
Main Results:
- MicroRNA sequencing revealed significant overexpression of miR-21 in mid-bud blastemas compared to stump tissues.
- Quantitative RT-PCR confirmed the differential expression of axolotl miR-21 (Amex-miR-21) in blastema versus stump.
- Jagged1 (Amex Jag1) was identified as a functional target gene of miR-21, with its 3'UTR containing a miR-21 recognition site essential for regulation.
Conclusions:
- MicroRNA levels, specifically miR-21, are altered during axolotl limb regeneration.
- miR-21 plays a role in regulating the expression of developmental genes like Jagged1 during regeneration.
- These findings provide a foundation for further in vivo studies on the role of microRNAs in modulating gene redeployment during tissue repair and regeneration.
