cDNA cloning of a germ cell specific lamin B3 from mouse spermatocytes and analysis of its function by ectopic expression in somatic cells.

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Abstract
The nuclear lamina is a fundamental component involved in the assembly of the nuclear envelope and higher order chromosomal structures in eukaryotes. In mammals, it is composed of four major lamin proteins, termed lamins A, B1, B2 and C. Here we first report cDNA cloning of a new 53 kDa lamin protein from mouse spermatocytes, termed lamin B3, the expression of which appears restricted to spermatogenic cells. Its gene structure indicates that lamin B3 is generated by differential splicing and alternative polyadenylation from lamin B2. When lamin B3 is introduced into somatic cells in culture, their nuclear morphology is transformed from spherical to hook-shaped. On the basis of the results obtained, we suggest that the germ cell specific lamin B3 is involved in the reorganization of nuclear and chromosomal structures during meiotic division.

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