The GATA1 N terminus coordinates metabolic reprogramming in erythropoiesis

Area of Science:

• Hematology
• Molecular Biology
• Genetics

Background:

• Mutations in GATA1 are linked to myeloid leukemia in Down syndrome and Diamond-Blackfan anemia (DBA).
• The N-terminal region of GATA1 is crucial for its function, but its specific roles remain unclear.

Purpose of the Study:

• To investigate the molecular functions of the GATA1 N-terminus in erythropoiesis.
• To understand the role of GATA1 in regulating gene expression, particularly glycolysis.

Main Methods:

• Single-cell RNA sequencing (scRNA-seq) was used on fetal liver cells from Gata1 mutant embryos.
• Precision nuclear run-on sequencing (PRO-seq) and cleavage under targets and release using nuclease (CUT&RUN) were employed after acute GATA1 deletion.
• Analysis included assessing gene expression, histone modifications (lactylation), enzyme activity, and metabolic flux.

Main Results:

• Gata1 mutations led to erythropoiesis defects and increased expression of glycolytic genes like PKM.
• PKM was identified as a direct GATA1 target gene.
• GATA1s isoform substitution induced histone lactylation, increased PKM expression and activity, and enhanced glycolytic flux in erythroid progenitors.
• Elevated PKM expression was observed in DBA patients with RPS19 mutations, correlating with reduced GATA1 levels.

Conclusions:

• GATA1 plays a critical role in regulating both heme metabolism and glycolytic reprogramming during erythropoiesis.
• Dysregulation of GATA1 and its target PKM contributes to defective erythropoiesis seen in certain anemias and leukemias.
• The N-terminus of GATA1 is essential for controlling metabolic pathways beyond heme synthesis.