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IGF1R antisense intragenic noncoding RNA (commonly known as IRAIN) (IRAIN)

Target: IRAIN
Molecular classification: Long noncoding RNA (lncRNA), Antisense RNA, Noncoding gene product (not a protein-coding gene)

Overview

IRAIN is a long noncoding RNA transcribed antisense to the IGF1R gene from an intronic promoter. It is monoallelically expressed from the paternal chromosome and lacks protein-coding potential. IRAIN plays a critical role in epigenetic regulation by mediating chromatin looping between enhancer and promoter regions of IGF1R, thus influencing IGF1R transcription. Downregulation of IRAIN, as observed in multiple cancers, relieves its regulatory constraint on IGF1R, resulting in overexpression of IGF1R and enhanced activation of oncogenic signaling pathways such as PI3K/AKT. IRAIN’s unique regulatory function and disease correlation make it a subject of interest for potential lncRNA-based cancer therapies and as a biomarker for tumorigenesis.

Other names: IRAINIGF1R antisense intragenic noncoding RNAIGF1R antisense lncRNAlnc-IGF1R-1IRAIN lncRNA

Mechanism of action

Not a drug target itself. Modulation of IRAIN (e.g., upregulation via CRISPR or antisense approaches) *indirectly* downregulates IGF1R via transcriptional interference/competition. The “mechanism of action” relates to regulating IGF1R signaling indirectly, not direct pharmacological targeting.

Biological functions

Chromatin organization: IRAIN is involved in facilitating enhancer/promoter chromatin looping at the IGF1R locusEpigenetic regulation: Functions as an epigenetic regulator by *cis*-competition with IGF1R for transcriptional machinery, modulating IGF1R expressionImprinting regulation: Expressed exclusively from the paternal allele (monoallelic, imprinted expression)Tumor suppression: Functions as a putative tumor suppressor by inhibiting IGF1R expression and associated signaling

Disease associations

Cancer (notably acute myeloid leukemia, breast cancer, non-small-cell lung cancer, and pancreatic cancer)Potential tumor suppressor whose loss or downregulation is associated with tumorigenesis and increased IGF1R signaling

Safety considerations

As a lncRNA, therapeutic targeting poses challenges in specificity, delivery, and off-target modulation. There are no established “safety concerns” specifically for IRAIN itself, but general challenges in lncRNA-targeted therapies apply.

Interacting drugs

None directly. IRAIN is not a direct drug target. However, research is ongoing into drugs and gene therapy approaches that might modulate its expression (e.g., CRISPR-mediated upregulation), but these are experimental and not established drug interactions.

Biomarkers

Decreased IRAIN expression is associated with poor prognosis or more aggressive cancer phenotypes, particularly in AML and breast cancer, suggesting potential as a *prognostic biomarker*Aberrant IGF1R/IRAIN expression ratio in cancer may serve as a biomarker for dysregulation of the IGF1R pathway

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