Hepatocyte nuclear factor 4α multiple isoforms, their functions, and their interactomes

Hepatocyte nuclear factor 4-alpha (HNF4a) is a master regulator gene belonging to the nuclear receptor superfamily and is involved in regulating a wide range of critical biological processes in different organs. Structurally, the HNF4A locus is organized into two independent promoters and is subjected to alternative splicing to produce twelve distinct isoforms. However, little is known about the biological impact of each isoform and the mechanisms by which they regulate transcription. Proteomic analyses have led to the identification of proteins that interact with specific HNF4a isoforms. The identification and validation of these interactions and their roles in the co-regulation of targeted gene expression are essential to better understand the role of this transcription factor in different biological processes and pathologies. This review addresses the discoveries of different HNF4a isoforms and the main functions of the P1 and P2 isoform subgroups. It also provides information on the most recent focus areas in research on the nature and function of proteins associated with each of the isoforms in some biological contexts.

Automated summary

HNF4a is a master regulator gene involved in critical biological processes and has twelve distinct isoforms. However, little is known about the biological impact of each isoform and their mechanisms of transcription regulation. Proteomic analyses have identified proteins that interact with specific HNF4a isoforms, and the study of these interactions is important for understanding the role of this transcription factor in different biological processes and pathologies.