التفاصيل البيبلوغرافية
| العنوان: |
The centriole adjunct of insects: Need to update the definition. |
| المؤلفون: |
Dallai, Romano, Paoli, Francesco, Mercati, David, Lupetti, Pietro |
| المصدر: |
Tissue & Cell; Apr2016, Vol. 48 Issue 2, p104-113, 10p |
| مصطلحات موضوعية: |
CENTRIOLES, INSECT cytology, EUKARYOTES, MICROTUBULE organizing centers (Cytology), AXONEMES, CENTROSOMES |
| مستخلص: |
The ancestral eukaryotes presumably had an MTOC (microtubule organizing center) which late gave origin to the centriole and the flagellar axoneme. The centrosome of insect early spermatids is in general composed of two components: a single centriole and a cloud of electron-dense pericentriolar material (PCM). During spermiogenesis, the centriole changes its structure and gives rise to a flagellar axoneme, while the proteins of PCM, gamma tubulin in particular, are involved in the production of microtubules for the elongation and shaping of spermatid components. At the end of spermiogenesis, in many insects, additional material is deposited beneath the nucleus to form the centriole adjunct (ca). This material can also extend along the flagellum in two accessory bodies (ab) flanking the axoneme. Among Homoptera Sternorrhyncha, a progressive modification of their sperm flagella until complete disappearance has been verified. In the Archaeococcidae Matsucoccus feytaudi , however, a motile sperm flagellum-like structure is formed by an MTOC activity. This finding gives support to the hypothesis that an evolutionary reversal has occurred in the group and that the cell, when a non-functional centriole is present, activates an ancestral structure, an MTOC, to form a polarized motile bundle of microtubules restoring sperm motility. The presence and extension of the centriole adjunct in the different insect orders is also enlisted. [ABSTRACT FROM AUTHOR] |
|
Copyright of Tissue & Cell is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Supplemental Index |
Full Text via ClinicalKey 
Full Text Finder