Required for cilia biogenesis and maintenance in the kidney, the lateral line organ and eye. Appears to function within the multiple intraflagellar transport complex B (IFT-B). Expressed maternally and ubiquitously throughout the embryo across different developmental stages from early 8-cell stage to 24 hpf. Mutant animals develop ventrally curved bodies visible at the end of 1 dpf, followed by bilateral kidney cysts in the glomerular-tubular region detectable at 2 dpf. Cilia in the anterior pronephric ducts are already visibly defective at 1 dpf and by 5 dpf, cilia are completely absent from these ducts. On the other hand, cilia from the posterior pronephric ducts remain unaffected. Cilia biogenesis is also defective in the retina, with the outer segments of photoreceptor cells having modified cilia. No visible cilia in the lateral line organ. Pericardial edema is also observed at 5 dpf. Belongs to the CLUAP1 family. Contaminating sequence. Potential poly-A sequence.