title: The intron-containing L3 ribosomal protein gene (RPL3): sequence analysis and identification of U43 and of two novel intronic small nucleolar RNAs.
abstract: Isolation and sequencing of bovine and human intron-containing L3 ribosomal protein genes are here reported. They exhibit very similar organisation, both comprising 10 exons and nine introns. A polymorphic locus, involving a 19-bp deletion, was found in intron 6 of the human gene. The frequency of the two alleles has been estimated in 200 haploid genomes. In bovine and human genes intron sequences are rather different, except for limited regions, located in corresponding positions, which show a surprisingly high degree of identity. All these regions contain conserved features defining the box C/D class of small nucleolar RNAs. Demonstration is given that U43 small nucleolar RNA is encoded within the first intron of both bovine and human genes. Single nucleotide sequences, encoding two novel species of small nucleolar RNAs (U82, U83a and U83b), are located in introns 3, 5 and 7. Their expression has been investigated and a possible role of these molecules in 2'-O-ribose methylation of rRNAs is discussed.
authors.affiliation: Istituto di Fisiologia Veterinaria e Biochimica, Università di Milano, Via Celoria 10, 20133, Milan, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Duga
authors.forename: R
authors.initials: R
authors.lastname: Asselta
authors.forename: M
authors.initials: M
authors.lastname: Malcovati
authors.forename: M L
authors.initials: ML
authors.lastname: Tenchini
authors.forename: S
authors.initials: S
authors.lastname: Ronchi
authors.forename: T
authors.initials: T
authors.lastname: Simonic
mesh_terms: D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002460:Cell Line; D015870:Gene Expression; D006801:Humans; D007438:Introns; D008745:Methylation; D051379:Mice; D008969:Molecular Sequence Data; D015347:RNA Probes; D012335:RNA, Ribosomal / Q000737:chemistry; D020537:RNA, Small Nucleolar / Q000737:chemistry / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000090822:Ribosomal Protein L3; D012269:Ribosomal Proteins / Q000737:chemistry / Q000235:genetics*
chemical_list: D015347:RNA Probes; D012335:RNA, Ribosomal; D020537:RNA, Small Nucleolar; C000716547:RPL3 protein, human; D000090822:Ribosomal Protein L3; D012269:Ribosomal Proteins; C000716548:Rpl3 protein, mouse