Abstract
Identifying the genetic variation underlying quantitative trait loci remains problematic. Consequently, our molecular understanding of genetically complex, quantitative traits is limited. To address this issue directly, we mapped three quantitative trait loci that control yeast sporulation efficiency to single-nucleotide resolution in a noncoding regulatory region (RME1) and to two missense mutations (TAO3 and MKT1). For each quantitative trait locus, the responsible polymorphism is rare among a diverse set of 13 yeast strains, suggestive of genetic heterogeneity in the control of yeast sporulation. Additionally, under optimal conditions, we reconstituted approximately 92% of the sporulation efficiency difference between the two genetically distinct parents by engineering three nucleotide changes in the appropriate yeast genome. Our results provide the highest resolution to date of the molecular basis of a quantitative trait, showing that the interaction of a few genetic variants can have a profound phenotypic effect.
MeSH terms
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Adaptor Proteins, Signal Transducing
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Base Sequence
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Carrier Proteins / genetics
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Chromosome Mapping
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Epistasis, Genetic
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Genes, Fungal
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Molecular Sequence Data
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Mutation, Missense
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Nucleotides / genetics
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Quantitative Trait Loci*
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Repressor Proteins / genetics
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Saccharomyces cerevisiae / genetics*
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Saccharomyces cerevisiae / physiology
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Saccharomyces cerevisiae Proteins / genetics*
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Spores, Fungal / genetics*
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Spores, Fungal / growth & development
Substances
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Adaptor Proteins, Signal Transducing
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Carrier Proteins
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MKT1 protein, S cerevisiae
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Nucleotides
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RME1 protein, S cerevisiae
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Repressor Proteins
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Saccharomyces cerevisiae Proteins
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TAO3 protein, S cerevisiae
Associated data
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GENBANK/DQ115389
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GENBANK/DQ115390
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GENBANK/DQ115391
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GENBANK/DQ115392
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GENBANK/DQ115393
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GENBANK/DQ116799
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GENBANK/DQ116800
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GENBANK/DQ116801
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GENBANK/DQ116802
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GENBANK/DQ116803
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GENBANK/DQ116804
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GENBANK/DQ116805
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GENBANK/DQ116806
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GENBANK/DQ116807
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GENBANK/DQ116808
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GENBANK/DQ116809
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GENBANK/DQ116810
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GENBANK/DQ116811
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GENBANK/DQ116812
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GENBANK/DQ116813
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GENBANK/DQ116814
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GENBANK/DQ116815
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GENBANK/DQ116816
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GENBANK/DQ116817
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GENBANK/DQ116818
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GENBANK/DQ116819
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GENBANK/DQ116820
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GENBANK/DQ116821
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GENBANK/DQ116822
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GENBANK/DQ116823
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GENBANK/DQ116824
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GENBANK/DQ116825
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GENBANK/DQ116826
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GENBANK/DQ116827
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GENBANK/DQ116828