Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2181646 | Fungal Genetics and Biology | 2007 | 9 Pages |
Abstract
In species of Neurospora, non-self recognition is mediated by at least 11 heterokaryon (het) incompatibility loci. Previously, we identified ancient allelic variation at het-c in pseudohomothallic N. tetrasperma, which confirmed outcrossing in this species. Here, we report distinct ancestral alleles at het-6 and un-24, two closely linked genes with het incompatibility function in N. crassa. The pattern of variation at het-6 and un-24 in N. tetrasperma is similar to that observed for N. crassa, where two ancestral allele specificities exist for each locus, Oak Ridge (het-6OR, un-24OR) and Panama (het-6PA, un-24PA). Only het-6OR/un-24OR and het-6PA/un-24PA allele combinations have been observed. The absence of recombinant haplotypes (e.g., het-6OR/un-24PA) appears to derive from an ancestral chromosomal rearrangement that limits recombination. Allelic variation at het-6 and un-24 in N. tetrasperma provides further evidence of outcrossing in this predominantly selfing species and indicates that selection maintains ancient allelic diversity at het loci.
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Authors
Amy J. Powell, David J. Jacobson, Donald O. Natvig,