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Review
. 2024 Nov;81(11):569-577.
doi: 10.1002/cm.21828. Epub 2024 Jan 12.

Functional and structural significance of the inner-arm-dynein subspecies d in ciliary motility

Ryosuke Yamamoto  1 , Takahide Kon  1
Affiliations
Review

Functional and structural significance of the inner-arm-dynein subspecies d in ciliary motility

Ryosuke Yamamoto et al. Cytoskeleton (Hoboken). 2024 Nov.

Abstract

Motile cilia play various important physiological roles in eukaryotic organisms including cell motility and fertility. Inside motile cilia, large motor-protein complexes called "ciliary dyneins" coordinate their activities and drive ciliary motility. The ciliary dyneins include the outer-arm dyneins, the double-headed inner-arm dynein (IDA f/I1), and several single-headed inner-arm dyneins (IDAs a, b, c, d, e, and g). Among these single-headed IDAs, one of the ciliary dyneins, IDA d, is of particular interest because of its unique properties and subunit composition. In addition, defects in this subspecies have recently been associated with several types of ciliopathies in humans, such as primary ciliary dyskinesia and multiple morphologic abnormalities of the flagellum. In this mini-review, we discuss the composition, structure, and motor properties of IDA d, which have been studied in the model organism Chlamydomonas reinhardtii, and further discuss the relationship between IDA d and human ciliopathies. In addition, we provide future perspectives and discuss remaining questions regarding this intriguing dynein subspecies.

Keywords: Chlamydomonas; IDA d; MMAF; PCD; cilia; inner‐arm dynein.

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