Plus-strand origin for human immunodeficiency virus type 1: implications for integration.

The start site for human immunodeficiency virus type 1 plus strands within the polypurine tract was mapped by an in vitro analysis to the sequence 5'-ACTG....From this result, it can be inferred that integration of human immunodeficiency virus type 1 must be accompanied by the loss of two base pairs from the polypurine tract-primed long terminal repeat end.     

Complete nucleotide sequence of the human corticotropin-beta-lipotropin precursor gene.

The nucleotide sequence of an 8658-base-pair human genomic DNA segment containing the entire corticotropin-beta-lipotropin precursor gene has been determined, and some sequence features of the gene and its flanking regions have been analysed. The gene is composed of 7665 base pairs including two introns of 3708 and 2886 base pairs. Comparison of the 5'-flanking sequences of the human, bovine and mouse corticotropin-beta-lipotropin precursor genes reveals the presence of a highly conserved region, which contains sequences of 14-15 base pairs homologous with sequences located upstream of the mRNA start site of other glucocorticoid-regulated genes.