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Genetics, Vol 122, 363-377, Copyright © 1989
INVESTIGATIONS |
Characterization of a Chlamydomonas Transposon, Gulliver, Resembling Those in Higher Plants
P. J. Ferris
Biology Department, Washington University, St. Louis, Missouri 63130
While pursuing a chromosomal walk through the mt(+) locus of linkage group VI of Chlamydomonas reinhardtii, I encountered a 12-kb sequence that was found to be present in approximately 12 copies in the nuclear genome. Comparison of various C. reinhardtii laboratory strains provided evidence that the sequence was mobile and therefore a transposon. One of two separate natural isolates interfertile with C. reinhardtii, C. smithii (CC-1373), contained the transposon, but at completely different locations in its nuclear genome than C. reinhardtii; and a second, CC-1952 (S1-C5), lacked the transposon altogether. Genetic analysis indicated that the transposon was found at dispersed sites throughout the genome, but had a conserved structure at each location. Sequence homology between the termini was limited to an imperfect 15-bp inverted repeat. An 8-bp target site duplication was created by insertion; transposon sequences were completely removed upon excision leaving behind both copies of the target site duplication, with minor base changes. The transposon contained an internal region of unique repetitive sequence responsible for restriction fragment length heterogeneity among the various copies of the transposon. In several cases it was possible to identify which of the dozen transposons in a given strain served as the donor when a transposition event occurred. The transposon often moved into a site genetically linked to the donor, and transposition appeared to be nonreplicative. Thus the mechanism of transposition and excision of the transposon, which I have named Gulliver, resembles that of certain higher plant transposons, like the Ac transposon of maize.
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