Cell cycle arrest allows centrin translation but not basal body formation during spermiogenesis in Marsilea.
J Cell Sci
; 114(Pt 23): 4265-72, 2001 Dec.
Article
em En
| MEDLINE
| ID: mdl-11739658
ABSTRACT
Spermiogenesis in the water fern Marsilea vestita is a rapid process that requires the de novo formation of basal bodies in a cytoplasmic particle known as a blepharoplast. Spermiogenesis is activated by placing dry spores into water and is dependent upon the translation of new proteins from stored mRNAs with little, if any, new transcription. We looked at the necessity of cell division cycles in the gametophyte as a prerequisite for the activation of centrin translation and for the consequent formation of blepharoplasts. Cell cycle arrest was induced by treatments of gametophytes with hydroxyurea, with olomoucine, or after RNAi, employing dsRNA derived from Marsilea cyclin A or cyclin B. In all cases, centrin is translated from stored mRNA at the normal time, approximately 4 hours after imbibition, and it accumulates to maximal levels approximately 6 hours after imbibition. In spite of the fact that centrin is translated at essentially normal times and accumulates to nearly normal levels, no blepharoplasts form in the gametophytes where division cycles have been disrupted. These results provide a clear demonstration that the new translation of centrin, by itself, is insufficient for blepharoplast formation, the de novo formation of basal bodies, and the assembly of a motile apparatus.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Plantas
/
Biossíntese de Proteínas
/
Proteínas de Ligação ao Cálcio
/
Proteínas Cromossômicas não Histona
/
Gleiquênias
Idioma:
En
Revista:
J Cell Sci
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Estados Unidos