title: Direct evidence for homologous sequences on the paracentric regions of human chromosome 1.
abstract: Calcyclin is a member of the S100 family of proteins, many of which are encoded by genes that have been localized to the proximal long arm of human chromosome 1 (bands q21-q22). A 450-kb yeast artificial chromosome clone containing the human calcyclin gene was identified by PCR screening and used as a probe for fluorescence in situ hybridization (FISH). Along with the expected hybridization to 1q21, simultaneous, specific hybridization to the centromeric region of the short arm of chromosome 1 was also observed. An identical pattern of hybridization was observed when microdissected 1q21 DNA sequences were used as a probe for FISH, confirming the presence of homologous sequences flanking both sides of the centromere of human chromosome 1. These results are consistent with a model in which human chromosome 1 arose by insertion of the centromere and heterochromatin into an ancestral chromosome containing chromosome-specific repetitive sequences.
authors.affiliation: Department of Dermatology, University of Michigan, Ann Arbor 48109-0672.
authors.forename: B D
authors.initials: BD
authors.lastname: Hardas
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: J M
authors.initials: JM
authors.lastname: Trent
authors.forename: J T
authors.initials: JT
authors.lastname: Elder
mesh_terms: D000818:Animals; D001483:Base Sequence; D002135:Calcium-Binding Proteins / Q000235:genetics*; D018797:Cell Cycle Proteins; D002503:Centromere; D002874:Chromosome Mapping; D018244:Chromosomes, Artificial, Yeast; D002878:Chromosomes, Human, Pair 1; D017931:DNA Primers; D004815:Epidermal Growth Factor / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D051379:Mice; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins; D012689:Sequence Homology, Nucleic Acid
chemical_list: D002135:Calcium-Binding Proteins; D018797:Cell Cycle Proteins; D017931:DNA Primers; D000075383:S100 Calcium Binding Protein A6; D009418:S100 Proteins; C489134:S100a6 protein, mouse; C055351:S100A6 protein, human; D004815:Epidermal Growth Factor