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- W1966691948 abstract "Though the 9+2 axonemal organization has generally been conserved throughout metazoan evolution, insect spermatozoa possess a substantial variety in axoneme ultrastructure, displaying different axonemal patterns. Therefore, insects provide a wide range of models that may be useful for the study of the mechanisms of axoneme assembly. We have used antibodies specific for glutamylated, monoglycylated, and polyglycylated tubulin to investigate the tubulin isoform content expressed in the unorthodox sperm axonemes of four insect species belonging to both of the superorders Palaeoptera and Neoptera. Each one of these axonemal models exhibits distinctive structural features, either showing the typical radial organization endowed with a ninefold symmetry or consisting of an helical arrangement with up to 200 microtubular doublets, but in all cases these axonemes share the absence of a microtubule central pair. Our results showed that all these atypical patterns are characterized by a dramatic decrease in both tubulin glycylation and glutamylation levels or even lack of both polymodifications. These data provide the first examples of a simultaneous extreme reduction or even absence of both polymodifications in axonemal tubulin. Given the unrelated positions of the analyzed species in the insect phylogenetic tree, this common feature is probably not due to evolutionary relationships. Therefore, our findings support the hypothesis of the existence of a correlation between the low level of polymodifications and the lack of a microtubule central pair in these peculiar insect flagellar axonemes, similarly as was previously proposed for cilia of Tetrahymena glycylation site mutants. Cell Motil. Cytoskeleton 61:226–236, 2005. © 2005 Wiley-Liss, Inc." @default.
- W1966691948 created "2016-06-24" @default.
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- W1966691948 date "2005-01-01" @default.
- W1966691948 modified "2023-09-30" @default.
- W1966691948 title "Tubulin glycylation and glutamylation deficiencies in unconventional insect axonemes" @default.
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- W1966691948 doi "https://doi.org/10.1002/cm.20081" @default.
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