Mass production of basal bodies in paraspermiogenesis of Tubificinae (Annelida, Oligochaeta)
Articolo
Data di Pubblicazione:
2002
Citazione:
Mass production of basal bodies in paraspermiogenesis of Tubificinae (Annelida, Oligochaeta) / M. Ferraguti, U. Fascio, S. Boi. - In: BIOLOGY OF THE CELL. - ISSN 0248-4900. - 94:2(2002), pp. 109-115.
Abstract:
The oligochaete annelids, belonging to the subfamily Tubificinae, produce two types of spermatozoa: eusperm (the fertilising ones) and
parasperm, protecting and carrying the eusperm. The pathway for the production of the two types is common until the onset of meiosis, but
then a regular meiosis produces eusperm, whereas parasperm is generated through a peculiar mechanism of nuclear fragmentation giving
rise to an irregular, but very high, number of paraspermatozoa. Since every parasperm has its own flagellum, this entails the necessity of
producing a very high number of basal bodies. In the present paper, we describe how basal bodies are generated through a mechanism
similar to that producing the basal bodies in ciliated epithelia, but never observed up to now during the genesis of a uniflagellated cell. Basal
bodies form in close proximity to a precursor structure called deuterosome, which originates de novo in the cytoplasm from fibrogranular
material. The various stages of centriologenesis are positive to anti-centrin antibodies and, observed by electron microscopy, correspond
closely to the ones described for ciliated epithelia. However, once formed, the basal bodies migrate to their final position and produce the parasperm flagellum.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Basal bodies ; Spermatogenesis ; Parasperm ; Annelids
Elenco autori:
M. Ferraguti, U. Fascio, S. Boi
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