DHX

DHX refers to a family of DEAH-box RNA helicases, a subset of the larger SF2 helicases. Members of this family use the energy of ATP hydrolysis to remodel RNA structures and RNA–protein complexes, enabling key steps in RNA metabolism such as pre-mRNA splicing, ribosome biogenesis, RNA export, decay, and translation regulation. The name DHX is derived from the characteristic DEAH motif (Asp-Glu-Ala-His) found in motif II of their helicase domain.

Most DHX proteins share a conserved helicase core composed of two RecA-like domains containing the ATP- and RNA-binding motifs, which coordinate strand separation and translocation along RNA. Many DHX members also possess accessory domains that determine substrate specificity and mediate interactions with other proteins, guiding their roles in particular RNA pathways and cellular compartments.

In humans, several DHX genes encode well-studied proteins, including DHX9 (RNA helicase A), DHX15, DHX30, DHX33, and DHX36 (RHAU). Orthologs are found across eukaryotes, reflecting their essential roles in RNA metabolism. DHX proteins localize to both nucleus and cytoplasm and contribute to processes ranging from splicing and ribosome assembly to RNA sensing and antiviral responses.

Research on the DHX family addresses fundamental biology and potential medical relevance. Alterations in DHX gene expression or function can impact RNA processing and gene expression, while certain members are investigated for their involvement in viral replication, cancer biology, and cellular stress responses. Further study aims to clarify substrate specificity and regulatory networks within this enzyme family.

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