Ascorbate peroxidase-related (APx-R) is not a duplicable gene.
Phylogenetic, genomic and functional analyses have allowed the identification of a new class of putative heme peroxidases, so called APx-R (APx-Related). These new class, mainly present in the green lineage (including green algae and land plants), can also be detected in other unicellular chloroplastic organisms. Except for recent polyploid organisms, only single-copy of APx-R gene was detected in each genome, suggesting that the majority of the APx-R extra-copies were lost after chromosomal or segmental duplications. In a similar way, most APx-R co-expressed genes in Arabidopsis genome do not have conserved extra-copies after chromosomal duplications and are predicted to be localized in organelles, as are the APx-R. The member of this gene network can be considered as unique gene, well conserved through the evolution due to a strong negative selection pressure and a low evolution rate.
Université de Toulouse, UPS; UMR 5546, Laboratoire de Recherche en Sciences Végétales, Castanet-Tolosan, France. christophe.dunand@lrsv.ups-tlse.fr
Christophe
C
Dunand
Catherine
C
Mathé
Fernanda
F
Lazzarotto
Rogério
R
Margis
Marcia
M
Margis-Pinheiro
D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics*; D060387:Ascorbate Peroxidases / Q000235:genetics*; D017124:Conserved Sequence; D057225:Data Mining; D019143:Evolution, Molecular; D018506:Gene Expression Regulation, Plant; D020131:Genes, Duplicate; D010802:Phylogeny; D011003:Ploidies
D029681:Arabidopsis Proteins; D060387:Ascorbate Peroxidases