Myeloid leukemia vulnerabilities embedded in long noncoding RNA locus MYNRL15.

Area of Science:

• Genomics
• Molecular Biology
• Cancer Research

Background:

• The noncoding genome, including long noncoding RNAs (lncRNAs), offers potential for novel biological insights.
• Dysregulation of lncRNAs is implicated in myeloid malignancies, but their functional roles require systematic investigation.

Purpose of the Study:

• To systematically interrogate the functional relevance of lncRNAs in myeloid malignancies.
• To identify novel noncoding vulnerabilities in myeloid leukemia.

Main Methods:

• CRISPR interference (CRISPRi) screens were employed to analyze lncRNA signatures in normal and malignant hematopoietic cells.
• Functional dissection of identified lncRNA dependencies was performed.

Main Results:

• The long noncoding RNA MYNRL15 was identified as a myeloid leukemia dependency.
• MYNRL15 functions via an RNA-independent mechanism involving two regulatory elements that mediate long-range chromatin interactions.
• Perturbation of MYNRL15 led to downregulation of key leukemia dependency genes and selective impairment of leukemia cells both in vitro and in vivo.

Conclusions:

• MYNRL15 represents a novel noncoding vulnerability and a new mechanistic concept for myeloid leukemia.
• Targeting MYNRL15 demonstrates potent and selective efficacy against leukemia cells while sparing normal hematopoietic stem and progenitor cells.