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Dynein axonemal assembly factor 4 (DNAAF4)

Target: DNAAF4
Molecular classification: Other (Co-chaperone/assembly factor), Tetratricopeptide repeat (TPR)-domain containing protein

Overview

Dynein axonemal assembly factor 4 (DNAAF4; also known as DYX1C1) is a cytoplasmic co-chaperone protein containing tetratricopeptide repeat (TPR) domains that facilitate interactions with molecular chaperones Hsp70/Hsp90[3][4]. DNAAF4 is essential for the pre-assembly of axonemal dynein arms, which power the motility of cilia. DNAAF4 mutations disrupt this process, causing primary ciliary dyskinesia, a disorder of motile cilia, and have also been implicated as a susceptibility factor for developmental dyslexia due to possible neuronal migration defects[1][3][4]. DNAAF4 functions as part of a multiprotein assembly complex, including other DNAAFs, and is specifically required for the cytoplasmic assembly of outer and some inner dynein arms prior to transport to the cilium[1][3]. The protein is expressed in tissues or cell types with motile cilia, such as the airway epithelium, testis, and neural tissues[2][1].

Other names: DYX1C1EKN1FLJ37882CILD25pf23Dyslexia susceptibility 1 candidate gene 1 proteinDYXC1DYX1dnaaf4dyx1c1zgc:77853RD

Biological functions

Axonemal dynein pre-assemblyCilium assembly and biogenesisRegulation of motile cilia functionNeuronal migration (possible role)Protein-protein interactions (with chaperones Hsp70, Hsp90, and estrogen receptors)

Disease associations

Primary ciliary dyskinesia (PCD)Developmental dyslexia (susceptibility gene, possible neuronal migration role)

Safety considerations

Mutations lead to defects in ciliary function, but there are no reported therapeutic safety issues as DNAAF4 is not a therapeutic target[3][4].

Biomarkers

DNAAF4 mutation/status may serve as a diagnostic marker for primary ciliary dyskinesia 25 (PCD25)[3].

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