Abstract:
:Epigenetic dysregulation has emerged as a recurring mechanism in the etiology of neurodevelopmental disorders. Two such disorders, CHARGE and Kabuki syndromes, result from loss of function mutations in chromodomain helicase DNA-binding protein 7 (CHD7LOF) and lysine (K) methyltransferase 2D (KMT2DLOF), respectively. Although these two syndromes are clinically distinct, there is significant phenotypic overlap. We therefore expected that epigenetically driven developmental pathways regulated by CHD7 and KMT2D would overlap and that DNA methylation (DNAm) alterations downstream of the mutations in these genes would identify common target genes, elucidating a mechanistic link between these two conditions, as well as specific target genes for each disorder. Genome-wide DNAm profiles in individuals with CHARGE and Kabuki syndromes with CHD7LOF or KMT2DLOF identified distinct sets of DNAm differences in each of the disorders, which were used to generate two unique, highly specific and sensitive DNAm signatures. These DNAm signatures were able to differentiate pathogenic mutations in these two genes from controls and from each other. Analysis of the DNAm targets in each gene-specific signature identified both common gene targets, including homeobox A5 (HOXA5), which could account for some of the clinical overlap in CHARGE and Kabuki syndromes, as well as distinct gene targets. Our findings demonstrate how characterization of the epigenome can contribute to our understanding of disease pathophysiology for epigenetic disorders, paving the way for explorations of novel therapeutics.
journal_name
Am J Hum Genetjournal_title
American journal of human geneticsauthors
Butcher DT,Cytrynbaum C,Turinsky AL,Siu MT,Inbar-Feigenberg M,Mendoza-Londono R,Chitayat D,Walker S,Machado J,Caluseriu O,Dupuis L,Grafodatskaya D,Reardon W,Gilbert-Dussardier B,Verloes A,Bilan F,Milunsky JM,Basran R,doi
10.1016/j.ajhg.2017.04.004subject
Has Abstractpub_date
2017-05-04 00:00:00pages
773-788issue
5eissn
0002-9297issn
1537-6605pii
S0002-9297(17)30148-9journal_volume
100pub_type
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