DNA methylation fingerprint of monozygotic twins and their singleton sibling with intellectual disability carrying a novel KDM5C mutation.

DNA methylation fingerprint of monozygotic twins and their singleton sibling with intellectual disability carrying a novel KDM5C mutation. Eur J Med Genet. 2019 Aug 13;:103737 Authors: Guerra JVS, Oliveira-Santos J, Oliveira DF, Leal GF, Oliveira JRM, Costa SS, Krepischi ACV, Vianna-Morgante AM, Maschietto M Abstract Mutations in KDM5C (lysine (K)-specific demethylase 5C) were causally associated with up to 3% of X-linked intellectual disability (ID) in males. By exome and Sanger sequencing, a novel frameshift KDM5C variant, predicted to eliminate the JmjC catalytic domain from the protein, was identified in two monozygotic twins and their older brother, which was inherited from their clinically normal mother, who had completely skewed X-inactivation. DNA methylation (DNAm) data were evaluated using the Illumina 450 K Methylation Beadchip arrays. Comparison of methylation levels between the three patients and male controls identified 399 differentially methylated CpG sites, which were enriched among those CpG sites modulated during brain development. Most of them were hypomethylated (72%), and located mainly in shores, whereas the hypermethylated CpGs were more represented in open sea regions. The DNAm changes did not differ between the monozygotic twins nor between them and their older sibling, all presenting a global hypomethylation, similar to other studies that associated DNA methylation changes to different KDM5C mutations. Th...
Source: European Journal of Medical Genetics - Category: Genetics & Stem Cells Authors: Tags: Eur J Med Genet Source Type: research