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Nucleic Acids Research, 1991, Vol. 19, No. 6 1259-1266
© 1991

MOLECULAR BIOLOGY

A transposon with an unusual LTR arrangement from Chiamydomonas reinhardtii contains an internal tandem array of 76 bp repeats

Anil Day* and Jean-David Rochaix

Departments of Molecular and Plant Biology, Sciences II, University of Geneva 30 Quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland

Received December 13, 1990. Revised February 22, 1991. Accepted February 22, 1991.

TOC1, a transposable element from Chlamydomonas reinhardtii, is 5662 bases long. The 217 and 237 base long terminal repeat sequences of TOC1 are unusually arranged around the 4600 and 123 base unique regions: [217]-4600-[237][217]-123-[237] Although TOC1 contains long terminal repeats and most TOC1 elements are complete, features shared with virus-like retroposons, its unique 4600 base reglon is more similar to the structure of the Li family of non-virus retroposons: first, 11 3/4 tandemly repeated copies of a 76 base repeat are found 813 bases from the left end of TOC1, and second using the universal genetic code large open reading frames were not found in TOC1. The relationship between TOC1, virus-like retroposons and the Li family of non-virus retroposons is unclear and may be very distant since only poor similarity was found between the TOC1 encoded OAFs and retrovirus polypeptides. The length of the tandem array of 76 base repeat sequences was conserved in most TOC1 elements and solo 76 base repeat sequences were not found outside TOC1 elements in the C.reinhardtii genome. Nucleotide substitutions allow all copies of the 76 base repeat to be distinguished from one another.

* Present Address: Genetics Laboratory, Biochemistry Department, South Parks Road, Oxford OX1 3QU, UK


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