HLF expression defines the human hematopoietic stem cell state.

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• Hematopoietic stem cells (HSCs) are crucial for lifelong blood cell production and regeneration.
• Current methods for isolating human HSCs rely on multiple surface markers, limiting precision.
• A need exists for a specific, single-parameter marker for prospective HSC isolation.

Purpose of the Study:

• To identify genes with highly selective expression in human HSCs.
• To develop a novel method for prospectively isolating human HSCs.
• To validate a new marker for HSC identification and tracking.

Main Methods:

• Profiling of population and single-cell transcriptomes from various human hematopoietic sources.
• Bioinformatic analysis to identify highly specific HSC marker genes.
• Development of a genomic HLF reporter strategy for cell labeling and tracking.

Main Results:

• The transcription factor HLF (hepatic leukemia factor) was identified as a highly specific marker for human HSCs.
• A genomic HLF reporter strategy was successfully developed to label immature blood cells.
• HLF-expressing cells demonstrated comprehensive stem cell activity in vitro and in vivo.

Conclusions:

• HLF is experimentally established as a defining gene of the human HSC state.
• The HLF reporter strategy provides a high-fidelity method for continuous marking of human HSCs.
• This work offers a new approach for the prospective isolation and study of human HSCs.