Splicing components are excluded from the transcriptionally inactive XY body in male meiotic nuclei

C Richler, G Ast, R Goitein, J Wahrman, R Sperling and J Sperling

Department of Genetics, Hebrew University of Jerusalem, Israel.

The study of the effect of programmed cessation of transcription in a large nuclear domain, on the distribution of elements of the pre-mRNA splicing machinery, is the main aim of this paper. To this end, we took advantage of the nuclear partitioning of mouse spermatocytes early in meiosis into autosomal transcribing and XY nontranscribing compartments. This system also allows to extend this study to stages in sperm differentiation that are accompanied by reduction and eventual cessation of transcription. We show by indirect immunofluorescence in spermatogenetic cells that 1) fluorescent signals of the pre-mRNA splicing factors SF53/4 and SC35, of the Sm antigens, and of RNA polymerase II, are largely absent from the nontranscribing, X- inactivated compartment, but are abundantly present in the transcribing autosomal compartment and 2) the presence, gradual reduction, and absence of transcriptive activity in nuclei undergoing the sperm formation sequence are positively correlated with the fluorescence patterns of the antibodies against SF53/4, SC35, and the Sm antigens. These data suggest that cessation of transcription during spermatogenesis is accompanied by exclusion of the splicing machinery from nontranscribing chromatin to its vicinity.

Volume 5, Issue 12, pp. 1341-1352, 12/01/1994
Copyright © 1994 by The American Society for Cell Biology

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