title: Structural organization of the human gene (LMNB1) encoding nuclear lamin B1.
abstract: We have determined the structural organization of the human gene (LMNB1) that encodes nuclear lamin B1, an intermediate filament protein of the nuclear envelope. The transcription unit spans more than 45 kb and the transcription start site is 348 nucleotides upstream from the translation initiation codon. Lamin B1 is encoded by 11 exons. Exon 1 codes for the amino-terminal head domain and the first portion of the central rod domain, exons 2 through 6 the central rod domain, and exons 7 through 11 the carboxyl-terminal tail domain of this intermediate filament protein. Intron positions are conserved in other lamin genes from frogs, mice, and humans but different in lamin genes from Drosophila melanogaster and Caenorhabditis elegans. In the region encoding the central rod domain, intron positions are also similar to those in the gene for an invertebrate nonneuronal cytoplasmic intermediate filament protein and the genes for most vertebrate cytoplasmic intermediate filament proteins except neurofilaments and nestin.
authors.affiliation: Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
authors.forename: F
authors.initials: F
authors.lastname: Lin
authors.forename: H J
authors.initials: HJ
authors.lastname: Worman
mesh_terms: D000818:Animals; D001483:Base Sequence; D017173:Caenorhabditis elegans; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004247:DNA / Q000737:chemistry; D004331:Drosophila melanogaster; D006372:Helix, Snails; D006801:Humans; D007381:Intermediate Filament Proteins / Q000235:genetics*; D007438:Introns; D034921:Lamin Type B; D034882:Lamins; D051379:Mice; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics*; D014982:Xenopus laevis
chemical_list: D007381:Intermediate Filament Proteins; D034921:Lamin Type B; D034882:Lamins; D009687:Nuclear Proteins; D004247:DNA