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

New insights into allelic diversity of a phosphoeno/pyruvate carboxylase in the conifer Picea abies (l.) Karst.

Two genomic full-length alleles of a phosphoenolpyruvate carboxylase (PEPC; EC 4.1.1.31) were isolated and analysed in the gymnosperm Norway spruce [Picea abies (L.) Karst.]. Mendelian segregation analysis confirmed that the two alleles belong to the same DNA gene locus. Southern analysis was performed using exon and intron probes, separately. A small gene family was discovered when exon probes were used. The isolated gene locus was termed PEPC-1 and found to exhibit the largest PEPC genomic sequence characterised so far in the plant kingdom. This is due to comparatively long intron sequences, and to an additional intron in the 3'-untranslated region. Sequence homology of the two full-length PEPC-1 alleles is 99.8%. From exon variation, one single exchange of an amino acid was deduced. The introns harboured polymorphic regions that were analysed for variability among three different spruce individuals. Within-PEPC-1 genotyping revealed that all three individuals could be unambiguously distinguished from each other. The results are discussed with respect not only to exon/intron site evolution among alleles but also to particular genomic features of a gymnosperm PEPC in comparison to PEPC in angiosperms.[1]

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