Ciliary Biology and Ciliopathies

Cilia are microtubule-based organelles projecting from the cell surface that act as both motile structures for fluid propulsion and non-motile sensory hubs for signal transduction. Their biogenesis relies on tightly regulated trafficking of proteins along the axoneme, and on precise control of centriole duplication to ensure singular cilium formation in most cell types. Ciliary receptors and transport machinery are essential for developmental signalling pathways, notably Hedgehog, Wnt and platelet-derived growth factor cascades, and for maintenance of tissue homeostasis. Genetic defects in ciliary assembly, structure or function give rise to a spectrum of multisystem disorders known collectively as ciliopathies, which include polycystic kidney disease, retinal dystrophy, skeletal dysplasia, and neurological malformations such as hydrocephalus. These conditions display considerable pleiotropy and variable expressivity, reflecting the central role of cilia in diverse organ-specific processes. Advances in proteomics, genomics and cell biology have begun to map the full complement of ciliary components, uncover new disease genes and reveal mechanistic links between ciliary dysfunction and clinical phenotypes, opening avenues for targeted diagnostics and therapeutics.

Research from Nature Portfolio

High-resolution affinity proteomics has delineated an extensive ciliary interactome comprising over 1,300 proteins and nearly 5,000 high-confidence interactions. This network exposes previously unrecognised complexes connecting vesicle trafficking, cytoskeletal dynamics and ubiquitin-mediated proteostasis to ciliary assembly and signalling, and identifies candidate disease loci in disorders not previously linked to cilia. Functional validation of one such locus implicated a congenital growth syndrome as a ciliopathy, with patient cells lacking primary cilia. Complementary structural and biochemical studies have illuminated the molecular controls that ensure formation of a single procentriole per parental centriole. The direct binding and co-phosphorylation of key regulators Plk4 and STIL orchestrates recruitment of cartwheel components, thus preventing aberrant centriole amplification and preserving genome integrity essential for faithful cilium biogenesis.

Ciliary Biology and Ciliopathies publication trend

The graph below shows the total number of articles in ciliary biology and ciliopathies across all publications each year (not limited to Nature Index journals).

Technical terms

Cilium: A hair-like projection from the cell surface containing a microtubule axoneme, involved in movement or signal sensing.

Primary cilium: A solitary, non-motile cilium present on most vertebrate cells that organises signal transduction pathways.

Intraflagellar transport (IFT): Bidirectional movement of protein complexes along axonemal microtubules, essential for cilium assembly and maintenance.

Ciliopathy: A genetically heterogeneous disorder caused by defects in ciliary structure or function, affecting multiple organs.

Procentriole: The nascent centriole that forms adjacent to a parental centriole and seeds daughter centriole assembly.

References

1. Congenital hydrocephalus: a review of recent advances in genetic etiology and molecular mechanisms. Military Medical Research (2024).
2. Signaling through the Primary Cilium. Frontiers in Cell and Developmental Biology (2018).
3. The Cilium: Cellular Antenna and Central Processing Unit. Trends in Cell Biology (2016).
4. An organelle-specific protein landscape identifies novel diseases and molecular mechanisms. Nature Communications (2016).
5. Direct interaction of Plk4 with STIL ensures formation of a single procentriole per parental centriole. Nature Communications (2014).
6. Characterizing the morbid genome of ciliopathies. Genome Biology (2016).