Evolution and Phylogeny of MicroRNAs - Protocols, Pitfalls, and Problems

Area of Science:

• Genomics
• Molecular Biology
• Evolutionary Biology

Background:

• MicroRNAs (miRNAs) are vital gene regulators in eukaryotes, conserved across species and playing key roles in development.
• Unlike protein-coding genes, miRNAs often arise de novo and are persistent evolutionary characters.
• Accurate miRNA annotation is essential for understanding their role in phenotypic evolution and for phylogenetic studies.

Purpose of the Study:

• To review current homology-based workflows for microRNA annotation.
• To emphasize the limitations and open problems in existing miRNA annotation methodologies.
• To provide a basis for understanding the impact of miRNAs on phenotypic evolution.

Main Methods:

• Review of state-of-the-art homology-based annotation workflows for microRNAs.
• Analysis of limitations and challenges associated with these computational methods.
• Discussion of the necessity of complementing experimental miRNA data with computational approaches.

Main Results:

• Homology-based methods are essential for miRNA annotation due to limited experimental data and ascertainment biases.
• Existing workflows have inherent limitations that need to be addressed for accurate and comprehensive annotation.
• The evolution of miRNA complements correlates with morphological innovations.

Conclusions:

• Accurate microRNA annotation is fundamental for evolutionary and developmental studies.
• Homology-based annotation methods are indispensable but require further refinement.
• Addressing limitations in current workflows is crucial for advancing our understanding of miRNA functions and evolution.