The various and shared roles of lncRNAs during development

Area of Science:

• Genomics and Molecular Biology
• Evolutionary Biology
• Developmental Biology

Background:

• Long non-coding RNAs (lncRNAs) are transcribed but not translated RNA molecules longer than 200 nucleotides.
• Their functions, primarily in gene expression regulation, suggest developmental and evolutionary conservation.
• Identifying lncRNA homologs across species is challenging due to their non-protein-coding nature and differing functional constraints compared to protein-coding genes.

Purpose of the Study:

• To propose alternative characteristics for identifying and comparing lncRNA homologs across species.
• To confirm the developmental and evolutionary conservation of lncRNAs using these characteristics.
• To exemplify conserved lncRNA identification with a case study in Drosophila embryogenesis.

Main Methods:

• Analysis of general synteny and chromosomal placement, independent of sequence similarity.
• Examination of sequence micro-motifs and secondary structure for homology assessment.
• Comparative analysis of lncRNAs across species to confirm conservation.

Main Results:

• General synteny, chromosomal location, sequence micro-motifs, and secondary structure can be used to identify and compare lncRNA homologs.
• These characteristics confirm the developmental and evolutionary conservation of lncRNAs.
• The lncRNA acal in Drosophila serves as a validated example of an evolutionarily conserved lncRNA essential for embryogenesis.

Conclusions:

• Developmental and evolutionary conservation of lncRNAs can be reliably assessed using non-sequence-based features.
• This approach facilitates the identification of functional homologs across diverse species.
• Conserved lncRNAs play critical roles in developmental processes, as demonstrated by acal in Drosophila.