HMGA2 Gene - High Mobility Group AT-Hook 2: Function, Mutations, and Disease

HMGA2 encodes a member of the high mobility group (HMG) protein family. The protein contains AT-hook DNA-binding domains and functions as an architectural transcription factor, regulating chromatin structure and gene expression. It plays critical roles in growth, development, and cell proliferation. Chromosomal rearrangements involving HMGA2 are frequently associated with benign mesenchymal tumors such as lipomas, uterine leiomyomas, and pituitary adenomas. Overexpression or truncation of HMGA2 is implicated in various cancers and growth disorders.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• PI3K-Akt signaling pathway

• MAPK signaling pathway

• TGF-beta signaling pathway

• Transcriptional misregulation in cancer

HMGA2 is a small nuclear protein (109 amino acids) with three AT-hook DNA-binding motifs that bind to the minor groove of AT-rich DNA sequences. It does not have intrinsic transcriptional activity but alters chromatin architecture to facilitate or repress transcription of target genes. The protein is highly expressed during embryonic development and in many cancers, but is low or absent in most normal adult tissues. Post-translational modifications include phosphorylation and acetylation, which modulate its DNA-binding affinity and stability.