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Science 29 July 1988:
Vol. 241. no. 4865, pp. 570 - 573
DOI: 10.1126/science.2840740
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Articles
Science, Vol 241, Issue 4865, 570-573
Copyright © 1988 by American Association for the Advancement of Science
DNAs of the two mating-type alleles of Neurospora crassa are highly dissimilar
NL Glass,
SJ Vollmer,
C Staben,
J Grotelueschen,
RL Metzenberg,
and
C Yanofsky
Department of Physiological Chemistry, University of Wisconsin, Madison 53706.
The mating-type alleles A and a of Neurospora crassa control mating in the sexual cycle and function in establishing heterokaryon incompatibility in the vegetative cycle. The A and a alleles were cloned, and they were shown to encode both the sexual functions and vegetative incompatibility. The mating-type clones contain nonhomologous DNA segments that are flanked by common DNA sequences. Neurospora crassa and all heterothallic and pseudohomothallic Neurospora species contain a single copy of one mating-type sequence or the other within each haploid genome. The six known self-fertile homothallic isolates contain an A homolog, but only one species also contains a homologous sequences. Homothallism in these species is not due to mating-type switching, as it is in Saccharomyces cerevisiae.
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