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A 300-bp repetitive element was found in the genome of the white button mushroom,Agaricus bisporus , and designatedAbr1 . It is present in ∼15 copies per haploid genome in the commercial strain Horst U1. Analysis of seven copies showed 89 to 97% sequence identity. The repeat has features typical of class II transposons (i.e., terminal inverted repeats, subterminal repeats, and a target site duplication of 7 bp). The latter shows a consensus sequence. When used as probe on Southern blots,Abr1 identifies relatively little variation within traditional and present-day commercial strains, indicating that most strains are identical or have a common origin. In contrast to these cultivars, high variation is found among field-collected strains. Furthermore, a remarkable difference in copy numbers ofAbr1 was found betweenA. bisporus isolates with a secondarily homothallic life cycle and those with a heterothallic life cycle.Abr1 is a type II transposon not previously reported in basidiomycetes and appears to be useful for the identification of strains within the speciesA. bisporus .

Abr1 , a Transposon-Like Element in the Genome of the Cultivated Mushroom Agaricus bisporus (Lange) Imbach