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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Molecular evolution of the GapC gene family in Amsinckia spectabilis populations that differ in outcrossing rate.

Molecular evolutionary analysis of the glyceraldehyde 3-phosphate dehydrogenase (GapC) gene family was conducted in the plant genus Amsinckia (Boraginaceae), a group that exhibits marked variation in the mating system. GapC genes in this group differ from those of Arabidopsis thaliana in terms of both intron size and number. Phylogenetic and Southern hybridization analyses suggest the presence of multiple GapC loci, each defined by a set of base substitutions that are in strong linkage disequilibrium. One species of Amsinckia, A. spectabilis, was studied in some detail. This species consists of selfing (A. s. spectabilis) and outcrossing (A. s. microcarpa) varieties. Two selfing populations and one outcrossing population sample were analyzed in detail for variation at one of the members of this gene family. GapC3. A reduction in number of GapC3 haplotypes and level of genetic diversity was observed in the selfing populations of A. spectabilis. GapC3 in the outcrossing population (but not the two selfing populations) exhibited a significant departure from neutrality in the direction of an excess of singletons. These results are discussed in the context of forces acting on sequence evolution in populations with different mating systems.[1]


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