Heterogeneous nuclear ribonucleoprotein L (hnRNP L)

Heterogeneous nuclear ribonucleoprotein L (hnRNP L) is an abundant nuclear protein encoded by the HNRNPL gene that belongs to the hnRNP superfamily, which is essential in RNA metabolism[1][6][8]. hnRNP L contains four RNA recognition motif (RRM) domains that mediate specific binding to CA-repeat or CA-rich RNA sequences and is a core component of hnRNP complexes critical for the formation, packaging, processing, and function of precursor and mature mRNA[1][5]. Beyond splicing, hnRNP L regulates mRNA stabilization, IRES-mediated translation, and is implicated in DNA repair, particularly during processes such as class switch recombination in immunoglobulin genes and response to DNA damage in cancer cells[7]. It interacts with other hnRNPs and key splicing factors, and its location can shift from nucleus to cytoplasm in response to stimuli such as hypoxia[3][5]. Aberrant expression or mislocalization of hnRNP L is associated with various disease states, especially certain cancers and viral infections, and it may play a pathophysiological role in neurological disorders[6]. While not a current direct drug target, its regulatory functions in gene expression, splicing, and translation underscore its centrality to fundamental cellular processes and disease mechanisms.

Other names

HNRNPLheterogeneous nuclear ribonucleoprotein LhnRNP Lheterogeneous ribonucleoprotein L

Blockade of RNA-protein interactions (e.g., RNA aptamer binding to hnRNP L inhibits viral RNA translation); Modulation of pre-mRNA alternative splicing; Regulation of DNA repair processes