Transcriptomic analysis of MicroRNA expression in enamel-producing cells.

Area of Science:

• Developmental Biology
• Epigenetics
• Molecular Biology

Background:

• Limited evidence exists on microRNA (miRNA) involvement in circadian rhythm regulation during enamel development.
• Ameloblast-like cell line LS8 has been used to study enamel formation gene activity, but miRNA transcriptomic analysis is lacking.

Purpose of the Study:

• To perform the first transcriptomic analysis of miRNA expression in LS8 cells over a 24-hour cycle.
• To identify oscillating miRNAs and their potential targets involved in enamel formation.

Main Methods:

• Next-generation deep sequencing was employed to analyze miRNA oscillations in LS8 cells across four time points.
• Bioinformatic analyses, including differential expression analysis, Gene Ontology (GO), and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis, were performed.
• Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) was used to validate sequencing data for selected miRNAs.

Main Results:

• A high number of clean reads were obtained, with most miRNA sequences (77.5%) falling between 21 and 24 nucleotides.
• A total of 1471 miRNAs were identified, including 1330 known and 139 novel sequences.
• 191 known miRNAs showed significantly differential expression across time points (P-value < 0.01).
• GO and KEGG analyses indicated significant enrichment of predicted target genes for differentially expressed miRNAs.
• qRT-PCR confirmed good correlation with sequencing data for six selected miRNAs.

Conclusions:

• MicroRNAs are highly expressed in LS8 cells and exhibit significant oscillations over a 24-hour period.
• This study provides the first transcriptomic profile of miRNAs in LS8 cells, establishing a foundation for further research into the epigenetic regulation of enamel formation.