Special Article

Ultrastructure of the Nucleus in Relation to Transcription and Splicing: Roles of Perichromatin Fibrils and Interchromatin Granules

EDMOND PUVION AND FRANCINE PUVION-DUTILLEUL
Laboratoire "Organisation fonctionnelle du noyau" de l'UPR 9044 CNRS, BP 8, F-94801 Villejuif Cedex, France

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Abstract
In the present article we summarize our results concerning the in situ ultrastructural organization of the nuclear steps of mRNA production using several cellular models including normal noninfected cells, herpes simplex virus type 1 and adenovirus type 5 infected cells, and transiently transfected cells. We confirm that perichromatin fibrils are the in situ morphological expression of nascent transcripts and the main support of splicing. Special emphasis is devoted to the clusters of interchromatin granules which seem to be involved in several central functions including accumulations of snRNP components as well as sorting and/or regulation of export of different RNA species.

EXPERIMENTAL CELL RESEARCH 229
217 - 225 (1996)
ARTICLE NO. 0363
Copyright © 1996 Academic Press, Inc.