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MBE Advance Access originally published online on April 25, 2003
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Mol. Biol. Evol. 20(7):1043-1050. 2003
DOI: 10.1093/molbev/msg124
© 2003 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038

DNA Polymorphism in Active Gene and Pseudogene of the Cytosolic Phosphoglucose Isomerase (PgiC) Loci in Arabidopsis halleri ssp. gemmifera

Akira Kawabe1, and Naohiko T. Miyashita

Laboratory of Plant Genetics, Graduate School of Agriculture, Kyoto University, Kyoto, Japan

E-mail: >akirakawabe{at}hotmail.com.

DNA variations in two PgiC loci were investigated in 15 strains of Arabidopsis halleri ssp. gemmifera. In a 5.5-kb region of the PgiC1 locus, 127 nucleotide substitutions and 33 length variations were observed. In a 6.0-kb region of the PgiC2 locus, 138 nucleotide substitutions and 33 length variations were observed. Frame shift, novel stop codons, and large length variations were observed in the PgiC2 coding region. These findings suggested that PgiC2 may be a pseudogene. The nucleotide diversities ({pi}) for the entire regions of both PgiC loci were approximately 0.0033. Tajima's test of both PgiC loci yielded significantly negative results. In the coding regions, the high proportions of replacement substitutions caused significant deviations from neutrality in McDonald and Kreitman's test. An excess of singletons and a high proportion of replacement polymorphic sites have been observed in the Adh and ChiA regions of A. halleri ssp. gemmifera. Thus, the A. halleri ssp. gemmifera population may not have reached equilibrium, and thus nonneutral patterns of DNA polymorphism were observed.

Key Words: PgiC • Arabidopsis halleri ssp. gemmifera • pseudogene • polymorphism


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A. Kawabe, S. Nasuda, and D. Charlesworth
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