The transposable element impala, a fungal member of the Tc1-mariner superfamily.
A new transposable element has been isolated from an unstable niaD mutant of the fungus Fusarium oxysporum. This element, called impala, is 1280 nucleotides long and has inverted repeats of 27 bp. Impala inserts into a TA site and leaves behind a "foot-print" when it excises. The inserted element, impala-160, is cis-active, but is probably trans-defective owing to several stop codons and frameshifts. Similarities exist between the inverted repeats of impala and those of transposons belonging to the widely dispersed mariner and Tc1 families. Moreover, translation of the open reading frame revealed three regions showing high similarities with Tc1 from Caenorhabditis elegans and with the mariner element of Drosophila mauritiana. The overall comparison shows that impala occupies an intermediate position between the mariner and Tc1-like elements, suggesting that all these elements belong to the same superfamily. The degree of relatedness observed between these elements, described in different kingdoms, raises the question of their origin and evolution.
Langin
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Institut de Génétique et Microbiologie, CNRS, Université Paris-Sud, Orsay, France.
Capy
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Daboussi
M J
MJ
D000595:Amino Acid Sequence; D001483:Base Sequence; D017124:Conserved Sequence; D004251:DNA Transposable Elements / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics; D005670:Fusarium / Q000201:enzymology / Q000235:genetics*; D005800:Genes, Fungal / Q000235:genetics*; D008969:Molecular Sequence Data; D005810:Multigene Family; D016254:Mutagenesis, Insertional; D009565:Nitrate Reductases / Q000235:genetics; D009713:Nucleotidyltransferases / Q000235:genetics; D016366:Open Reading Frames; D010802:Phylogeny; D011110:Polymorphism, Genetic; D015183:Restriction Mapping; D013045:Species Specificity; D013489:Suppression, Genetic; D019895:Transposases
D004251:DNA Transposable Elements; D005656:Fungal Proteins; D009565:Nitrate Reductases; D009713:Nucleotidyltransferases; D019895:Transposases