| 释义 |
transposon Genetics.|trɑːnsˈpəʊzɒn, træns-, -nz-|
[f. transposition + -on1.]
A chromosomal segment that can undergo transposition (sense 7); spec. a segment of bacterial DNA that can be translocated en bloc between chromosomal, phage, and plasmid DNA in the absence of a complementary sequence in the host DNA.
1974Hedges & Jacob in Molecular & Gen. Genetics CXXXII. 38 We designate DNA sequences with transposition potential as transposons (units of transposition). 1978Nature 11 May 171/3 The determinants of resistance to at least seven different antibiotics form part of independent structures several kilobase-pairs long, called ‘transposons’, which can jump between the genomes of bacteria, plasmids and phages of widely different base compositions. 1980Sci. Amer. Sept. 87/3 Some transposons carry genes for traits such as drug resistance that are clearly advantageous to a bacterial host under some circumstances. 1982Nature 21 Oct. 676/1 Transposons, familiar enough in bacteria.., have been identified in..eukaryotic genomes principally because their DNA sequences can crop up at different places. |