title: The human homologue of the mouse Surf5 gene encodes multiple alternatively spliced transcripts.
abstract: Hu-Surf5 is included within the Surfeit locus, a cluster of six genes originally identified in mouse. In the present study, we have cloned and characterized the Hu-Surf5 gene and its mRNA multiple transcripts. Comparison of the most abundant cDNA and genomic sequence shows that the Hu-Surf5 is spread over a region of approximately 7.5 kb and consists of five exons separated by four introns. The nucleotide sequence of the genomic region flanking the 3'-end of the Hu-Surf5 gene revealed the presence of a processed pseudogene of human ribosomal protein L21 followed by Hu-Surf6 gene. Only 110 bp separate the transcription start site of Hu-Surf5 and Hu-Surf3/L7a gene and the transcription direction is divergent. Earlier studies defined the 110 bp region essential for promoter activity of Hu-Surf3/L7a. Here, we show that this region stimulates transcription with a slightly different efficiency in both directions. The bidirectional promoter lacks an identifiable TATA box and is characterized by a CpG island that extends through the first exon into the first intron of both genes. These features are characteristic of housekeeping genes and are consistent with the wide tissue distribution observed for Hu-Surf5 expression. Hu-Surf5 encodes three different transcripts, Surf-5a, Surf-5b, and Surf-5c, which result from alternative splicing. Two protein products, SURF-5A and SURF-5B have been characterized. Production of chimaeras between the full-length SURF-5A or SURF-5B and the green fluorescent protein (GFP) allowed to localize both proteins in the cytoplasm.
authors.affiliation: Dipartimento di Biochimica e Biotecnologie Mediche, Università 'Federico II' and CEINGE Biotecnologie Avanzate, Via Sergio Pansini 5, I-80131, Naples, Italy.
authors.forename: Antonietta
authors.initials: A
authors.lastname: Angiolillo
authors.forename: Giulia
authors.initials: G
authors.lastname: Russo
authors.forename: Antonio
authors.initials: A
authors.lastname: Porcellini
authors.forename: Silvia
authors.initials: S
authors.lastname: Smaldone
authors.forename: Felicia
authors.initials: F
authors.lastname: D'Alessandro
authors.forename: Concetta
authors.initials: C
authors.lastname: Pietropaolo
mesh_terms: D017398:Alternative Splicing; D001483:Base Sequence; D003001:Cloning, Molecular; D005091:Exons; D005260:Female; D015870:Gene Expression; D049452:Green Fluorescent Proteins; D006367:HeLa Cells; D006801:Humans; D007438:Introns; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D056892:Mediator Complex; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics; D011506:Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured
chemical_list: D008164:Luminescent Proteins; C484358:MED22 protein, human; D056892:Mediator Complex; D011506:Proteins; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; C098231:Surf5 protein, mouse; D014157:Transcription Factors; D049452:Green Fluorescent Proteins