Biased inheritance of optional insertions following mitochondrial genome recombination in the basidiomycete fungus Coprinus cinereuss

Current Genetics - Tập 11 - Trang 513-519 - 1987
A. Economou1, V. Lees1, P. J. Pukkila2, M. E. Zolan2, L. A. Casselton1
1School of Biological Sciences, Queen Mary College, London, UK
2Department of Biology and Curriculum in Genetics, University of North Carolina at Chapel Hill, Chapel Hill, USA

Tóm tắt

Two mitochondrial genomes of Coprinus cinereus, H and J, were found to have alternative 1.23 kb insertions. Using the Neurospora crassa cytochrome oxidase-1 (co-1) gene as a probe, the “J” insertion site was shown to be located within the Coprinus co-1 gene, whereas the “H” insertion was some 2 kb distant. The insertions showed biased inheritance following mitochondrial genome recombination. Recombination between H and J genomes was detected using the mitochondrial gene mutations acu-10, which causes a cytochrome oxidase defect, and cap-1, which confers chloramphenicol resistance. Fourteen of fifteen independently derived recombinants for these two genes were shown to have both DNA insertions. In a second series of H x J crosses, intragenic recombination between different cap-1 alleles was detected. These mutations are assumed to be in the large ribosomal RNA gene some 6 kb distant from the nearest insertion site. Each of eight independently derived cap-1 + recombinants had both DNA insertions. Despite their similar size and similar behaviour following recombination the insertions do not share extensive sequence homology.

Tài liệu tham khảo

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