Mining single-cell transcriptomic data reveals distinct T-cell population in pediatric B-ALL and AML at diagnosis

Area of Science:

• Immunology
• Oncology
• Genomics

Background:

• Immunotherapy shows promise for pediatric leukemia but is less effective in acute myeloid leukemia (AML) than B-cell acute lymphoblastic leukemia (B-ALL).
• Understanding T-cell heterogeneity is crucial for improving leukemia immunotherapies.

Purpose of the Study:

• To characterize T-cell subsets in pediatric B-ALL and AML using single-cell RNA sequencing.
• To identify T-cell differences between B-ALL and AML that could inform immunotherapy.

Main Methods:

• Integrated single-cell RNA sequencing (scRNA-seq) analysis of 47,610 T cells from pediatric B-ALL, AML patients, and healthy donors.
• Identification of 17 transcriptionally distinct T-cell subsets.

Main Results:

• Distinct T-cell subsets were identified that differentiate B-ALL from AML, including proliferative, naïve CD4, progenitor exhausted, and regulatory T cells.
• A rare T-cell subset expressing hemoglobin genes, associated with heme metabolism and hypoxia pathways, was enriched in B-ALL and linked to better outcomes.

Conclusions:

• T-cell heterogeneity in pediatric B-ALL and AML is significant and characterized by distinct subsets.
• Findings provide insights into T-cell function in leukemia and potential targets for future T-cell-based immunotherapies.