KpnI families of long, interspersed repetitive DNAs in human and other primate genomes - PubMed (original) (raw)
Comparative Study
KpnI families of long, interspersed repetitive DNAs in human and other primate genomes
B Shafit-Zagardo et al. Nucleic Acids Res. 1982.
Abstract
KpnI restriction of DNAs from all anthropoid primates studied releases a conspicuous series of segments representing families of long, interspersed repetitive DNAs termed here the KpnI 1.2, 1.5, 1.8 and 1.9 kb families. Human KpnI 1.2 to 1.9 kb segments representative of these families were isolated and separately cloned in the KpnI site of a plasmid pBK5, specially constructed for this purpose. The KpnI clones did not cross-hybridize with cloned, primate alphoid sequences, suggesting that the KpnI families represent sequences separate and distinct from the alphoid DNAs. Secondary restriction analyses of cloned KpnI segments demonstrated microheterogeneity among individual members within the same KpnI family. Autoradiograms of capuchin monkey, AGM and human DNA cleaved with HaeIII, AluI or RsaI and hybridized to various cloned human KpnI sequences demonstrated a remarkable conservatism and relative simplicity in the organization of the KpnI families in the genomes of these widely divergent primates. The KpnI 1.2 kb and 1.5 kb families occur in high frequency (15%) among all plaques in two recombinant human genome libraries. Evidence is presented suggesting that the bulk of the KpnI families occur in the genome as clusters or congeries of higher molecular weight segments (greater than 2 kb) containing sequences homologous to the low molecular weight segments (1.2 to 1.9 kb).
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