DYRK1A

Dual specificity tyrosine-phosphorylation-regulated kinase 1A is an enzyme that in humans is encoded by the DYRK1A gene. Alternative splicing of this gene generates several transcript variants differing from each other either in the 5' UTR or in the 3' coding region. These variants encode for at least five different isoforms.

Function
DYRK1A is a member of the dual-specificity tyrosine phosphorylation-regulated kinase (DYRK) family. This member contains a nuclear targeting signal sequence, a protein kinase domain, a leucine zipper motif, and a highly conservative 13-consecutive-histidine repeat. It catalyzes its autophosphorylation on serine/threonine and tyrosine residues. It may play a significant role in a signaling pathway regulating cell proliferation and may be involved in brain development. This gene is a homolog of the Drosophila mnb (minibrain) gene.

DYRK1A has also been shown to modulate plasma homocysteine levels in a mouse model of overexpression.

Clinical significance
DYRK1A is localized in the Down syndrome critical region of chromosome 21, and is considered to be a strong candidate gene for learning defects associated with Down syndrome. In addition, a polymorphism (SNP) in DYRK1A was found to be associated with HIV-1 replication in monocyte-derived macrophages, as well as with slower progression to AIDS in two independent cohorts of HIV-1-infected individuals. Mutations in DYRK1A are also associated with autism spectrum disorder.

Interactions
DYRK1A has been shown to interact with WDR68.

In popular culture
Rosie, the protagonist of BBC sitcom There She Goes, has the DYRK1A gene, as revealed in the show's final episode.