J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/06/1001/16 $2.00
Volume 137, Number 5, June 2, 1997 1001-1016

Insertional Mutation of the Drosophila Nuclear Lamin Dm₀ Gene Results in Defective Nuclear Envelopes, Clustering of Nuclear Pore Complexes, and Accumulation of Annulate Lamellae

Bettina Lenz-Böhme,^* Jasmine Wismar,^* Silke Fuchs,^* Rita Reifegerste, Erich Buchner, Heinrich Betz,^* and Bertram Schmitt^*

^* Max-Planck-Institut für Hirnforschung, Abteilung Neurochemie, D-60528 Frankfurt am Main, Germany; and  Theodor-Bovery-Institut, Lehrstuhl für Genetik der Universität Würzburg, D-97074 Würzburg, Germany

Nuclear lamins are thought to play an important role in disassembly and reassembly of the nucleus during mitosis. Here, we describe a Drosophila lamin Dm₀ mutant resulting from a P element insertion into the first intron of the Dm₀ gene. Homozygous mutant animals showed a severe phenotype including retardation in development, reduced viability, sterility, and impaired locomotion. Immunocytochemical and ultrastructural analysis revealed that reduced lamin Dm₀ expression caused an enrichment of nuclear pore complexes in cytoplasmic annulate lamellae and in nuclear envelope clusters. In several cells, particularly the densely packed somata of the central nervous system, defective nuclear envelopes were observed in addition. All aspects of the mutant phenotype were rescued upon P element-mediated germline transformation with a lamin Dm₀ transgene. These data constitute the first genetic proof that lamins are essential for the structural organization of the cell nucleus.

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