Chinese Academy Of Medical Sciences Identifies TET2–GFI1 Axis As Critical Epigenetic Brake In Myelodysplastic Syndromes

Chinese researchers have mapped the DNA methylome of MDS stem cells at base-resolution, identifying the TET2–GFI1 axis as a key regulator of cancer prevention.

By: AXL Media

Published: Apr 9, 2026, 9:23 AM EDT

Source: Information for this report was sourced from EurekAlert!

Mapping The Epigenetic Landscape Of MDS Stem Cells

Researchers have achieved a significant milestone in hematology by producing the first panoramic view of DNA methylation abnormalities in human Myelodysplastic Syndromes (MDS) at single-base resolution. The study, led by Professor Xuetao Cao and Dr. Liangding Hu, utilized advanced sequencing to compare the genetic makeup of hematopoietic stem cells (HSCs) from high-risk patients against healthy donors. This high-resolution approach moved beyond previous low-resolution studies, revealing widespread hypermethylation in CpG island regions and simultaneous hypomethylation in repetitive elements like Alu sequences. These distinct patterns provide a comprehensive view of how the genome is disrupted during the development of myeloid malignancies.

The TET2–GFI1 Axis And Malignant Transformation

The investigation focused on the role of TET2, a DNA demethylase that is frequently mutated in MDS patients. Although the presence of these mutations was well-known, the exact mechanism by which they caused bone marrow failure remained unclear. The team demonstrated that TET2 acts as a direct mediator for demethylation at the GFI1 promoter. When TET2 function is lost, the GFI1 gene becomes hypermethylated and repressed, acting as a failed "epigenetic brake." This failure leads to an uncontrolled expansion of the hematopoietic stem cell pool, effectively removing the biological barrier that prevents the initiation of MDS and its progression into acute leukemia.

Identifying Key Regulators Through Pathway Analysis

By integrating DNA methylation data with functional analysis, the researchers identified critical targets within intrinsic transcriptional regulatory networks. While the GFI1 gene showed pronounced hypermethylation and reduced expression, another regulator, BMI1, exhibited DNA hypomethylation and subsequent upregulation. These findings connect epigenetic enzyme mutations directly to dysregulated transcription factor expression. The study highlights that the malignant transformation of HSCs is not a result of a single genetic error, but a coherent pathogenic cascade involving extrinsic signaling pathways and essential regulators of stem cell homeostasis.