Cell type specific long non-coding RNA targets identified by integrative analysis of single-cell and bulk colorectal...

Area of Science:

• Genomics
• Cancer Biology
• Molecular Oncology

Background:

• Long non-coding RNAs (lncRNAs) are increasingly recognized for their roles in human cancers.
• Functional studies of lncRNAs in cancer cell subtypes are limited, with a focus on protein-coding genes.
• Understanding lncRNA contributions to Colorectal Cancer (CRC) heterogeneity is crucial.

Purpose of the Study:

• To explore the role and specificity of lncRNAs in Colorectal Cancer (CRC) heterogeneity.
• To identify novel lncRNAs enriched in CRC epithelial cells and differentially expressed in tumors.
• To experimentally validate the functional significance of specific lncRNAs in CRC proliferation.

Main Methods:

• Single-cell RNA sequencing of 49,436 cells from 29 CRC patients.
• Analysis of lncRNA cell-type specificity compared to protein-coding genes.
• Integration of bulk CRC expression data (270 profiles) to identify differentially expressed lncRNAs.
• Experimental validation of CASC19 and LINC00460 in CRC cell lines using CRISPR-Cas9 knockdown.

Main Results:

• lncRNAs demonstrated significantly higher cell-type specificity than protein-coding genes in CRC.
• 996 lncRNAs were identified as highly enriched in epithelial cells.
• 98 of these lncRNAs were differentially expressed in tumor versus normal CRC tissues.
• Upregulation of CASC19 and LINC00460 was confirmed, and their knockdown affected CRC proliferation.

Conclusions:

• lncRNAs play a significant role in CRC heterogeneity and exhibit distinct cell-type specific expression patterns.
• CASC19 and LINC00460 are identified as novel, upregulated lncRNAs implicated in CRC proliferation.
• These findings highlight potential new RNA-based therapeutic targets for Colorectal Cancer.