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We have isolated recombinant lambda-phage clones that contain sequences complementary to the 3' half of the cDNA encoding human topoisomerase I (hTOP1). These lambda clones belong to three distinct classes: class-I clones contain sequences from the active gene located on human chromosome 20. Class-II and class-III clones contain sequences corresponding to the cDNA encoding hTOP1 from nucleotide (nt) 2208 to 3434 and from nt 1639 to 3434, respectively. These sequences exhibit the characteristic features of retroposons or retrosequences. They are most likely derived from truncated mRNA transcripts of the active gene. We propose to designate the truncated hTOP1 sequence located on chromosome 1 as the pseudogene 1 (psi 1-hTOP1) and the sequence on chromosome 22 as the pseudogene 2 (psi 2-hTOP1). Pseudogene psi 1-hTOP1 has two unique properties: it is flanked by upstream sequences which display promoter activity in transient expression assays, and it contains an open reading frame which could code for the 211 C-terminal amino acids of hTOP1. Pseudogene psi 2-hTOP1 is located within an AluI repetitive element and is flanked on one side by a (CA)21 stretch.
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