A noncoding antisense RNA in tie-1 locus regulates tie-1 function in vivo

Area of Science:

• Molecular Biology
• Genetics
• Developmental Biology

Background:

• Antisense (AS) transcripts, often long noncoding RNAs (lncRNAs), associate with messenger RNAs in eukaryotes.
• The functions of most lncRNAs remain largely unknown.
• Understanding lncRNA function is critical for deciphering gene regulation.

Purpose of the Study:

• To identify and characterize a natural antisense transcript for tyrosine kinase containing immunoglobulin and epidermal growth factor homology domain-1 (tie-1).
• To investigate the role of the tie-1AS lncRNA in zebrafish development and vascular biology.
• To explore the potential involvement of tie-1AS lncRNA in human vascular anomalies.

Main Methods:

• Identification of tie-1AS lncRNA in zebrafish, mouse, and humans.
• Analysis of tie-1AS expression patterns in embryonic zebrafish.
• In vivo and in vitro binding assays to study tie-1AS and tie-1 mRNA interaction.
• Assessment of endothelial cell junction defects.
• Analysis of tie-1/tie-1AS ratios in human vascular anomaly samples.

Main Results:

• A natural antisense lncRNA, tie-1AS, was identified for the tie-1 gene across species.
• tie-1AS is expressed temporally and spatially in embryonic zebrafish, co-localizing with tie-1 mRNA.
• tie-1AS selectively binds tie-1 mRNA in vivo, regulating tie-1 transcript levels and causing endothelial cell junction defects.
• Altered tie-1/tie-1AS ratios were observed in human vascular anomaly samples.

Conclusions:

• Noncoding RNA-mediated transcriptional regulation is a fundamental mechanism in physiological processes.
• tie-1AS lncRNA plays a significant role in vascular development by regulating tie-1 expression.
• Dysregulation of the tie-1/tie-1AS ratio may contribute to human vascular anomalies.