Abstract
To investigate the DNA-methylation levels in the newly described MEG8 differentially methylated region (DMR) in the imprinted cluster in 14q32 in patients with Temple syndrome. We included three patients with Temple syndrome which were studied by Infinium HumanMethylation450 BeadChips, locus-specific bisulfite-pyrosequencing, methylation-specific-MLPA and microsatellite analyses. The tag-CpG of the MEG8-DMR was investigated using the Infinium HumanMethylation450 BeadChip. In all three patients, the identical pattern of DNA-hypermethylation of the MEG8-DMR was observed along with DNA-hypomethylation of the IG-DMR and MEG3-DMR. Based on the observed MEG8-DMR DNA-hypermethylation and previously published data, we conclude that DNA-methylation of the MEG3- and MEG8-DMR is functionally dependent on the DNA-methylation pattern of the IG-DMR. The observed combination of epimutations is predicted to be associated with bi-allelic MEG3 and MEG8 expression in individuals with Temple syndrome.
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