In this paper the satellite DNA (stDNA) of the phytophagous beetle Xanthogaleruca luteola is analyzed. It is organized in a tandem repeat of 149-bp-long monomers, has an AT content of 59%, and presents inverted internal repeats. Restriction analysis of the total DNA with methylation-sensitive enzymes suggests that this repetitive DNA is not methylated. Analysis of the electrophoretic mobility of stDNA on non-denaturing polyacrylamide gels showed that this stDNA is not curved. In situ hybridization with a biotinylated probe of the stDNA revealed a pericentromeric localization of these sequences in the majority of the meiotic bivalents. We have studied the stDNA of X. luteola from two populations with very distinct geographical origins. The sequence and phylogenetic analysis of monomers from these two populations showed that the repetitive element is conserved within the species. Putative gene conversion tracts are identified when the different monomers of the same population are compared. These results could indicate the existence of processes of homogenization that would extend these mutations to all the satellite repeats.   

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