Single-cell profiling of long non-coding RNAs in the hematopoietic system

Area of Science:

• Hematology
• Genomics
• Molecular Biology

Background:

• Long non-coding RNAs (lncRNAs) are critical regulators in hematopoiesis but their specific functions across diverse blood cell types are not fully understood.
• Understanding the lncRNA landscape is essential for elucidating normal blood cell development and identifying mechanisms of hematological malignancies.

Purpose of the Study:

• To construct a comprehensive single-cell lncRNA atlas of human hematopoiesis.
• To identify lineage-specific lncRNAs and investigate their potential roles in leukemogenesis.

Main Methods:

• Integration of nine single-cell RNA sequencing (scRNA-seq) datasets from 30 healthy donors, encompassing over 200,000 cells.
• Analysis of lncRNA expression patterns across hematopoietic stem and progenitor cells (HSPCs) and differentiated blood cell lineages.
• Experimental validation of selected lineage-specific lncRNAs.

Main Results:

• A hematopoietic hierarchy based on lncRNA expression closely mirrored that based on protein-coding genes.
• Identification of 3,463 lineage-specific lncRNAs, with 23 validated experimentally.
• Upregulated lncRNAs in pediatric leukemia subtypes were linked to oxygen response and immune regulation pathways.

Conclusions:

• The study provides a detailed landscape of lncRNAs in the hematopoietic system.
• lncRNAs play significant roles in both normal and aberrant hematopoiesis.
• Identified lncRNAs represent potential therapeutic targets for leukemia treatment.