Summary
When homozygous the recessive, pleiotropic, mutationhpy (hydrocephalic-polydactyl) produces post-natal hydrocephalus, complete sterility in males, and reduced reproductive performance in females. Because the fertility problems and the development of hydrocephalus could arise as consequences of defective flagella and ciliary axonemes, this mutant type might serve as a useful animal model for the immotile cilia syndrome. Ultrastructural defects seen in axonemes of flagella, and of cilia from the trachea, oviduct, and ependyma included: a deficiency of inner dynein arms (the most frequent defect); an absence of one or both central-pair tubules; extra central tubules; a displacement of one outer doublet and/or the central-pair tubules. Some axonemes showed more than one of these defects. The frequency of dynein-deficient axonemes in all three tissues was similar (about 35%) and fell within the range reported for human patients with the immotile cilia syndrome. On this basis, this mutant type might be considered as a useful animal model for such studies. There were no indications of situs inversus, nor was there a marked increase in respiratory problems. Sohpy/hpy mice do not exhibit all of the clinical symptons characteristic of the human condition.
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Bryan, J.H.D. The immotile cilia syndrome. Vichows Archiv A Pathol Anat 399, 265–275 (1983). https://doi.org/10.1007/BF00612944
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DOI: https://doi.org/10.1007/BF00612944