title: A subfamily of alphoid repetitive DNA shared by the NOR-bearing human chromosomes 14 and 22.
abstract: The nucleotide sequence of members of an alpha-repeat subfamily shared by human chromosomes 14 and 22 is presented. This subfamily is organized into a higher-order repeat unit composed of a tandem repetition of an ordered array of four related but distinct 340-bp repeat dimers. An analogous situation has been described for a related but distinct subfamily shared by chromosomes 13 and 21. These two subfamilies were further shown not to be present on the homologous chimpanzee chromosomes and therefore must have arisen by rearrangement of the human genome after separation of the two species. The sequence homology between the 13/21 and the 14/22 subfamilies is about 85%. The 14/22 subfamily represents the only major alphoid DNA species on these two chromosomes and is not present elsewhere in the human genome. Fluorescent in situ hybridizations show that sequences from the 13/21 and 14/22 subfamilies can be used as specific markers for their respective chromosomes.
authors.affiliation: Institutes of Medical Microbiology, University of Aarhus, Denmark.
authors.forename: A L
authors.initials: AL
authors.lastname: Jørgensen
authors.forename: S
authors.initials: S
authors.lastname: Kølvraa
authors.forename: C
authors.initials: C
authors.lastname: Jones
authors.forename: A L
authors.initials: AL
authors.lastname: Bak
mesh_terms: D000818:Animals; D001483:Base Sequence; D005075:Biological Evolution; D015139:Blotting, Southern; D002882:Chromosomes, Human, Pair 13; D002883:Chromosomes, Human, Pair 14; D002891:Chromosomes, Human, Pair 21; D002892:Chromosomes, Human, Pair 22; D004247:DNA / Q000235:genetics*; D015342:DNA Probes; D006801:Humans; D006822:Hybrid Cells / Q000166:cytology; D007621:Karyotyping; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D012091:Repetitive Sequences, Nucleic Acid
chemical_list: D015342:DNA Probes; D004247:DNA