title: Isolation and characterization of the human inter-alpha-trypsin inhibitor family heavy chain-related protein (IHRP) gene (ITIHL1).
abstract: Inter-alpha-trypsin inhibitor (ITI) family heavy chain-related protein (IHRP) is a novel human glycoprotein that shows significant homology in amino acid sequence to proteins of the ITI family heavy chains from human plasma. Three overlapping clones that encode the human inter-alpha-trypsin inhibitor family heavy chain-related protein (IHRP) gene (ITIHL1) were isolated and characterized. The IHRP gene spans 15 kb and is composed of 24 exons from 27 to 207 bp in size with consensus splice sites. The gene codes for the precursor of IHRP, which is similar to inter-alpha-trypsin inhibitor (ITI) family heavy chains. Two major transcription initiation sites were identified in the 5'-flanking region. They contain putative promoter elements, but no typical TATA box. Some exons of this gene showed significant similarities to those of the ITI-H1 gene in nucleotide length and in intron phasing. The tissue-specific transcription of this gene may be due to the presence of binding sites for the hepatocyte nuclear factors LF-A1, HNF-5, NF-IL6, and C/EBP. This gene was found to be localized very close to another unknown gene related to EST (GenBank accession #: R54643, R50663, R50563, H27139, and R54913).
authors.affiliation: Department of Physiological Chemistry, School of Pharmaceutical Sciences, Showa University, Tokyo.
authors.forename: K
authors.initials: K
authors.lastname: Saguchi
authors.forename: T
authors.initials: T
authors.lastname: Tobe
authors.forename: K
authors.initials: K
authors.lastname: Hashimoto
authors.forename: Y
authors.initials: Y
authors.lastname: Nagasaki
authors.forename: E
authors.initials: E
authors.lastname: Oda
authors.forename: Y
authors.initials: Y
authors.lastname: Nakano
authors.forename: N H
authors.initials: NH
authors.lastname: Miura
authors.forename: M
authors.initials: M
authors.lastname: Tomita
mesh_terms: D001483:Base Sequence; D001798:Blood Proteins / Q000235:genetics*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D005091:Exons; D006023:Glycoproteins / Q000235:genetics*; D006801:Humans; D017403:In Situ Hybridization; D007438:Introns; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D011498:Protein Precursors / Q000235:genetics; D053491:Proteinase Inhibitory Proteins, Secretory; D014158:Transcription, Genetic
chemical_list: D001798:Blood Proteins; D018076:DNA, Complementary; D006023:Glycoproteins; C091236:ITIH4 protein, human; D011498:Protein Precursors; D053491:Proteinase Inhibitory Proteins, Secretory