title: Structure and chromosome localization of the human eosinophil-derived neurotoxin and eosinophil cationic protein genes: evidence for intronless coding sequences in the ribonuclease gene superfamily.
abstract: Human genomic DNAs for the eosinophil granule proteins, eosinophil-derived neurotoxin (EDN) and eosinophil cationic protein (ECP), were isolated from genomic libraries. Alignment of EDN (RNS2) and ECP (RNS3) gene sequences demonstrated remarkable nucleotide similarities in noncoding sequences, introns, and flanking regions, as well as in the previously known coding regions. Detailed examination of the 5'-noncoding regions yielded putative TATA and CAAT boxes, as well as similarities to promoter motifs from unrelated genes. A single intron of 230 bases was found in the 5' untranslated region and we suggest that a single intron in this region and an intronless coding region are features common to many members of the RNase gene superfamily. The RNS2 and RNS3 genes were localized to the q24-q31 region of human chromosome 14. It is likely that these two genes arose as a consequence of a gene duplication event that took place approximately 25-40 million years ago and that a subset of anthropoid primates possess both of these genes or closely related genes.
authors.affiliation: Department of Immunology, Mayo Clinic and Foundation, Rochester, Minnesota 55905.
authors.forename: K J
authors.initials: KJ
authors.lastname: Hamann
authors.forename: R M
authors.initials: RM
authors.lastname: Ten
authors.forename: D A
authors.initials: DA
authors.lastname: Loegering
authors.forename: R B
authors.initials: RB
authors.lastname: Jenkins
authors.forename: M T
authors.initials: MT
authors.lastname: Heise
authors.forename: C R
authors.initials: CR
authors.lastname: Schad
authors.forename: L R
authors.initials: LR
authors.lastname: Pease
authors.forename: G J
authors.initials: GJ
authors.lastname: Gleich
authors.forename: R L
authors.initials: RL
authors.lastname: Barker
mesh_terms: D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D001798:Blood Proteins / Q000235:genetics*; D002871:Chromosome Banding; D002874:Chromosome Mapping; D002883:Chromosomes, Human, Pair 14; D006224:Cricetinae; D047091:Eosinophil Granule Proteins; D047208:Eosinophil-Derived Neurotoxin; D004804:Eosinophils; D005091:Exons; D005796:Genes; D006801:Humans; D006822:Hybrid Cells; D007438:Introns; D008969:Molecular Sequence Data; D005810:Multigene Family; D009498:Neurotoxins / Q000235:genetics*; D011401:Promoter Regions, Genetic; D012260:Ribonucleases / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid
chemical_list: D001798:Blood Proteins; D047091:Eosinophil Granule Proteins; D009498:Neurotoxins; D047208:Eosinophil-Derived Neurotoxin; D012260:Ribonucleases; C479221:RNASE2 protein, human